ACUSON Sequoia512.pdf

GE Medical Systems

Acuson Sequoia 512

Acuson Sequoia 512

Modality - Ultrasound

Assembly and Disassembly Component Locations Error Codes Functional Checks Logic/Block Diagrams Preventive Preventiv e Maintenance Software Theory Troubleshooting/Diagnostics Instructional Movies

How to Use this Tool Self-Paced Training Modules This program and its contents are RESTRICTED to GE Medical Systems. For GE Medical Systems personnel only. No rights licensed do not use unless you are a GE Medical Systems employee. If you are not a GE Medical Medical Systems employee you must close this application immediately.. Disclosure to third parties prohibited. HCLS-produced immediately documents are not intended for use as documentation for feild-based diagnostic imaging equipment. Copyright GE Medical Systems 2000.

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Assembly and Disassembly

Acuson Sequoia 512

Assembly and Disassembly Select an Assembly and Disassembly topic:

• Cover Removal • Keyboard / TrackballR rackballRemoval emoval • Monitor Removal • Filter Removal • Power Switch Cover Removal


Component Locations

Error Codes

Functional Checks

Logic/Block Diagrams

Preventive Maintenance

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GE Medical Systems

Acuson Sequoia 512

Component Location

Componentt Location Componen Select a Componen Component: t:

• BDM • CS D • RDP • IOV • IOE • PIC • BF • CN • MX • RX • TX -


Component Locations

B-Mode Syste tem m Dat ata a Memory Color Spectral Doppler Reconstruction Display Processor Input / Output Video Input / Output Expansion Peripheral Interface Controller Beamformer Controller Multiplexer Receiver Transmi ransmitter tter

Error Codes

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Acuson Sequoia 512

GE Medical Systems

Component Location

MX RX TX BF CN CSD

BDM

RDP IOV IOE PIC


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Software

Theory

Troubleshooting/ Diagnostics

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Acuson Sequoia 512

GE Medical Systems

Component Location

Keyboard

TGC’s CINE

Trackball


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Acuson Sequoia 512

GE Medical Systems

Component Location

Monitor Probe Holders

Floppy Drive Ethernet

Auxiliary Cart Connection

Keyboard

Filter Location Filter Location

Power Supply

Fan Tray Probe Port Foot Lock


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Error Codes

Acuson Sequoia 512

GE Medical Systems Error Codes

• Refer to the Acuson Sequoia 512 Service Manual and the Troubleshooting Section of this EPST for references to errors and common system problems.


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Acuson Sequoia 512

Functional Checks

Functional Checks / Procedures

Note


All functional checks and procedures are outlined as part of the Refer to that section for more information.

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Preventative Maintenance

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procedure.

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Acuson Sequoia 512



Select a diagram:

1. Color Doppler Signal Path 2. Spectral Doppler Signal Path


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Logic/Block diagrams

Acuson Sequoia 512

GE Medical Systems

SPECTRAL DOPPLER I & Q PHYSIO

HARD DISK OPTICAL DRIVE

AUDIO

AUDIO / VCR / PHYSIO

BF

SCSI

CSD

FIZ TRANSDUCER

RX

COLOR DOPPLER I&Q

IOV

COLOR PRINTER VCR PLAYBACK

BF CN

BDM

RDP VCR

MX

B-MODE / M- MODE DATA

PIC

B-MODE M-MODE SPECTRAL COLOR DOPPLER VCR DATA

PROGRESSIVE VIDEO

SYSTEM AUDIO

AEGIS

TX MONITOR

IMAGEFORMER CONTROL USER INTERFACE

IOE TX AEGIS

ETHERNET

Color Doppler Signal Path Assembly and Disassembly

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Error Codes Functional Checks



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Logic/Block diagrams

Acuson Sequoia 512

GE Medical Systems

SPECTRAL DOPPLER I & Q PHYSIO

HARD DISK OPTICAL DRIVE

AUDIO

AUDIO / VCR / PHYSIO

BF

SCSI

CSD

FIZ TRANSDUCER

RX

COLOR DOPPLER I&Q

IOV

COLOR PRINTER VCR PLAYBACK

BF CN

BDM

RDP VCR

MX

B-MODE / M-MODE DATA

PIC

B-MODE M-MODE SPECTRAL COLOR DOPPLER VCR DATA

PROGRESSIVE VIDEO

SYSTEM AUDIO

AEGIS

TX MONITOR

IMAGEFORMER CONTROL USER INTERFACE

IOE TX AEGIS

ETHERNET

Spectral Doppler Signal Path Assembly and Disassembly

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Error Codes Functional Checks



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GE Medical Systems

Acuson Sequoia 512



Select a Preventative Maintenance topic: • Electrical Verification

• Introduction

• Following Basic Precautions

• Preliminaries • Initiating Cue

• System Motor Controls

• Interview the Operator

• Power On Self Diagnostics • Operational Verification

• Visual Inspection • Basic Precautions

• Transducer Selection

• Cleaning and Sanitizing the System

• Cardiology Controls • Aegis

• Cleaning Air Filters

• Peripherals Operation Verification

• Mechanical Inspection

• Service User Interface

• Monitor Assembly


• Keyboard and Monitor Lift Mechanism

• Entering SUI During Power-Up

• Wheels and Locking Mechanism

• User Interface Test

• Covers and Panels

• Existing SUI

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Acuson Sequoia 512

GE Medical Systems


System

Introduction

This section is intended to specify the recommended frequency to perform a Preventive Maintenance to the Acuson Sequoia 512 system. Periodic maintenance provides significant contribution to ongoing reliability and performance of a system. The Sequoia 512 system is an exceptionally reliable and mobile modern electronic equipment and it contains superior self-diagnostics. No calibration or electronic adjustments are required.

System - Preliminaries Initiating Cue

There are several ways that a Preventive Maintenance (PM) inspection may be initiated. The minimum recommended frequency of PM inspections is one per year. We recommend that a PM be performed: • Periodically. This period may vary from 3 months to 7 months, depending upon the operating environment. • Following a customer request.


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Acuson Sequoia 512


System - Preliminaries Interviewing the Operator

Before starting the actual PM, you should meet briefly with the operator(s) and discuss any problems or concerns that they may have with the system. It is important to take time to address the concerns relating to the performance of the system. Review at least the following: • Follow up on any open issues. • Have there been any problems? • Does the machine appear to be functioning normally? • Are they satisfied with the diagnostic quality of the images?

Continued


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Acuson Sequoia 512


System - Visual Inspection Basic Precautions

Visually inspect the operating environment for biohazards before doing anything to the system or the transducers. Important: Ultrasound systems are sometimes used in an environment in which they are exposed to pathogens, which pose a potential health hazard to persons handling the system. For health reasons, always thoroughly clean, sanitize and/or sterilize the system and its transducers prior to performing maintenance. • Look for visual signs of biohazard presence on and around the system. • Use caution especially when handling the system or the transducers, because bloodborne pathogens may be present. • Take necessary action, if biohazard presence is suspected. • If not sure, treat system as infected and consult with an infection control nurse for assistance.


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Acuson Sequoia 512


System - Visual Inspection Continued Cleaning and Sanitizing the System

To clean or sanitize the system: • Turn off the system and unplug it from the power outlet. • Clean the system cabinet, transducer holders, and storage bay with a damp cloth soaked in mild soap and water, or sanitize it using isopropyl alcohol or a sanitizing solution. WARNING! DO NOT drip any liquid into the system or onto the keyboard.


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Acuson Sequoia 512

GE Medical Systems


System - Visual Inspection Continued Cleaning Air Filters

The Acuson Sequoia 512 system has two air filters. Air filters are located on both the right rear and left rear of the system. Component Location shows the position of the air filters. Remove, inspect, and clean the air filters each week. To remove and clean the air filters: • Unplug the system from the power outlet. • To remove the air filters located on the upper right and left side of the system, use the tab on each filter to slide it out and remove the filter. • Wash the filters in water with mold detergent and dry them, or clean them with a hand-held vacuum cleaner. •Replace the filters.


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Acuson Sequoia 512

GE Medical Systems


System - Mechanical Inspection

To inspect the mechanical integrity of the system: The Sequoia 512 system is a mechanically robust equipment, and it is specially designed to be very mobile and maneuverable. However, mechanical inspection is recommended for the following items. Monitor Assembly

To inspect the tilt and swivel capabilities of the system monitor assembly: • Push the locking handle in to release the monitor assembly lock. • Check the vertical tilt maneuverability by rotating the monitor up and down vertically. • Check the swivel maneuverability by rotating the monitor assembly horizontally.


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Acuson Sequoia 512

GE Medical Systems


System Mechanical Inspection Continued:

Keyboard and Monitor Lift Mechanism

To inspect the keyboard and monitor lift mechanism: • Release the lift lock by depressing the button situated inside the right keyboard handle grip. • Gently move the keyboard lift up and down to check the lift mechanism.


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Acuson Sequoia 512

GE Medical Systems


System Mechanical Inspection Continued:

Wheels and Locking Mechanism

To inspect the wheels and locking mechanism: • Push the locking mechanism towards the back of the system to check the locking of the wheels. • Push the locking mechanism towards the front of the system to check the unlocking of the wheels. • Push the locking mechanism into mid position to check the steering of the system. Covers and Panels

Inspect the covers and panels for any damage.


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Acuson Sequoia 512

GE Medical Systems


System - Electrical Verification

Following Basic Precautions

The following safety precautions should be observed when servicing the Acuson Sequoia 512 system: WARNING! Lethal voltages (up to 300 VDC) are present inside the Acuson Sequoia 512 system. Use caution when opening the unit. Under certain fault conditions, the high voltage bus may remain charged even when the main Breaker is Off. Furthermore, the operating temperature of some components can cause burns. IMPORTANT: The Sequoia 512 system employs a software power-on/off circuit. This means that there are live voltages present in the system even with the power off. Always unplug the system to perform any cleaning or maintenance. Following Basic Precautions

To check the following for electrical verification of the system: •Verify that the LEDs are lit on PIC board. Continued


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Acuson Sequoia 512

GE Medical Systems


System - Electrical Verification Continued

• Check the connectors on the power cable for any deformation or discoloration due to resistive heating of connector pins. Also check the power cable for any deformation or damage. Replace cable or connector, if necessary. • Verify that the line voltage is within specifications (see Chapter 1, Introduction and System Requirements). Measurement should be within the stated range when the system is both on and off. The system may shut itself down, if line voltages are outside these specifications. • Verify that all recording devices such as VCRs or printers are connected to one of the isolated outlets on the back of the Sequoia 512 system. If these devices are plugged directly into the wall outlets, excessive leakage current may cause a hazard. • Verify the operation of the cooling fans. Listen for any excessive noise caused by failed bearings. If fans are running at higher than normal speed, then notify Acuson service provider. • Verify the leakage current on the system using your test equipment. For the specifications of the leakage current limits, see Chapter 1 of the Service Manual, Introduction and System Requirements.


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Acuson Sequoia 512

GE Medical Systems


System - Monitor Controls

Since many of the tests involve careful examination of the displayed ultrasound image on the monitor, it is essential that the monitor is set up in a consistent way on each occasion. The level of ambient light will also influence the tests and it should be consistent as much as possible. To check the Sequoia 512 system monitor: • Pull the monitor control knobs out to CALIBRATE mode and use it as your start up reference. • Enter Service User Interface Tests and Utilities menu to check the following Video test patterns: • Convergence patterns • Color Crosshatch pattern • SMPTE test pattern • Color Bar pattern IMPORTANT: Do not forget to return the monitor control knobs to their original position when finished, keeping in mind that users are generally very particular about monitor settings.


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Acuson Sequoia 512

GE Medical Systems


System - Power On Self Diagnostics

To check the system for any Power Up error messages: • Turn the system on by depressing the ON/OFF switch located underneath the monitor. • Wait for the self-diagnostics to run. If any errors are reported, refer to the Troubleshooting Chapter of the Service Manual and resolve the problem before proceeding any further. If problems do arise which are difficult to troubleshoot or are subtle in nature, contact your Acuson Service provider.


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Acuson Sequoia 512

GE Medical Systems


System - Operational Verification

This section provides the basic means of verifying the operation of Acuson Sequoia 512 system and its recording devices. When evaluating the Sequoia 512 system operation consult your Sequoia 512 User Manual on using the system. Your User Manual contains more specific information on the clinical use of the system.

Continued


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Acuson Sequoia 512

GE Medical Systems


System - Operational Verification Continued

Transducer Selection To check the ability of the system to recognize all available transducers:

• Insert the transducer connector into one of the three active transducer ports on the front panel of the system, and rotate the locking knob clockwise to lock the transducer in place. • Press XDUCR key to display all transducers available on the softkey menu. Press the softkey corresponding to the transducer you want to check. • Press the MULTIHERTZ toggle up or down to change the imaging frequency available to you on the transducer. • Select modalities from user interface to check available modes for each transducer. • Repeat the procedure for all available transducers. To check B-mode functionality: • Select a transducer and verify B-mode controls for their operation. IMPORTANT: For more specific information on the B-mode controls, consult your User Manual. Continued


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Acuson Sequoia 512

GE Medical Systems



To check Spectral Doppler functionality: • Obtain a B-mode image of the area of interest and position Doppler gate on the area of flow. • Enter Solo Spectral Doppler and verify B-mode controls for their operation. IMPORTANT: For more specific information on the Spectral Doppler controls, consult your User Manual.

To check the Color Doppler functionality: • Obtain a B-mode image of the area of interest and position CD Res Box on the area of flow. • Enter SST Color Doppler and verify Color Doppler controls for their operation. IMPORTANT: For more specific information on the Color Doppler controls, consult your User Manual.


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Acuson Sequoia 512

GE Medical Systems



Cardiology Controls

To check the M-mode functionality (if available): • Select a cardiac transducer and obtain a B-mode image of the area of interest and position the M-mode cursor on the area of motion. • Enter M-mode and check the operation. IMPORTANT: For more specific information on the M-mode controls, consult your User Manual.

To check Physio Module functionality (if available): • Plug the ECG cable into the Physio Module and stick the ECG electrodes to yourself and check the operation. IMPORTANT: For more specific information on the ECG controls, consult your User Manual.


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Acuson Sequoia 512

GE Medical Systems



AEGIS

To check the AEGIS functionality: • Store a static image on AEGIS and review it on the monitor to check the AEGIS acquisition and review function. •Store a dynamic clip on AEGIS and review it on the monitor to check the dynamic AEGIS operation.


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Acuson Sequoia 512

GE Medical Systems


System - Peripheral Operation Verification

This section provides basic means of verifying operation of the peripherals interfaced to a Sequoia 512 system. Always consult your User Manual on how to use the peripherals. Your User Manual contains more specific information on the use of the peripherals. To check the operation of the Sony VCR - SVO 9500 MDP: • Check VCR configuration and cabling with the Sequoia 512 system. • Turn the VCR on, insert a blank tape, and verify the operation of the VCR. IMPORTANT: For more specific information on the VCR controls, consult your user manual.

Continued


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Acuson Sequoia 512

GE Medical Systems


System - Peripheral Operation Verification

To check the operation of the Sony UP-5650 or UP-1800 color printer: • Check printer configuration and cabling with the Sequoia 512 system. • Verify that the printer is loaded with film and paper. • Print a color image from Sequoia 512 system and verify the operation of the printer. To check the operation of the Sony UP-910, UP-930 and UP-890 B/W printer: • Check printer configuration and cabling with the Sequoia 512 system. • Verify that the printer is loaded with the paper. • Print a B/W image from Sequoia 512 system and verify the operation of the printer. To check the operation of the IIE Multi-Image Camera, check camera configuration and cabling with the Sequoia 512 system: • Verify that the camera is loaded with the film cartridge. • Print a B/W image from Sequoia 512 system and verify the operation of the camera. IMPORTANT: For more specific information on the use of peripheral devices, consult your User Manual.

Continued


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Acuson Sequoia 512

GE Medical Systems


System - Service User Interface

Entering SUI During Power-Up

You can enter the SUI menu as you start up the system. The SUI menu appearance is different from other menus in the system. However, you will use the trackball land the trackball select keys to navigate through the menu. To enter the SUI menu: • With the system powered off, hold the MULTIHERTZ key in the up position (towards the monitor). At the same time, hold down the S key on the alphanumeric keyboard. • As you hold down these keys, power on the system. Continue to hold these keys for five to eight seconds, and then release. The SUI menu appears momentarily. • Move the arrow over User Diagnostics and press either trackball select key. A menu of selections appear.


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Acuson Sequoia 512

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System - Service User Interface Continued

User Interface Test Run the following User Interface Test: Test:

• Echo Key • LED • Echo LCD Run the Audio Test • For detailed descriptions of available Service Service User Interface tests, refer refer to Service Manual, Diagnostics. Exiting SUI To exit SUI and return to imaging:

• With the User Diagnostics menu displayed, move the arrow over Reboot and press the trackball select key. The system will re-initialize to imaging mode.


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Software

Acuson Sequoia 512

GE Medical Systems

Software

See the Acuson Sequoia 512 Ser Service vice Manual for software and configuration information. It is important to refer to the tables in the service manual when changing circuit boards to insure compatibility.


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Acuson Seqouia 512

GE Medical Systems

Theory

Theory Select a Theory Topic:

System Architecture

Board Listing • BDM • CSD • RDP • IOV • IOE • PIC • BF • CN • MX • RX • TX

• Theory of Operation • DIAMQ Subsystem Control • User Interface

Power Subsystem • Theory of Operation • Primary Primary AC Wiri Wiring ng • Power Configurations • Peripherals Power • System DC Power Distribution

(B-Mode System Data Memor y) (Color Spectral Doppler) (Reconstruction Display Processor) (Input/Output Video) (Input/Output Expansion) (Peripheral Interface Controller) (Beamformer) (Controller) (Multiplexer) (Receiver) (Transmitter)

• Power Supply Noise • Power Supply Sync • Power Fail Signal • Power-Up Sequence • Power-Down Sequence


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Acuson Seqouia 512

Theory

System Architecture

Theory of Operation

The DIMAQ Ultrasound Workstation performs the following major functions for normal B-mode imaging: • Overall control of the Sequoia system • Storage of ultrasound data for CINE functions • Conversion of ultrasound scan format to video scan format • Alphanumeric and graphic display • Interface to operator (front panel controls) • Interface to peripheral recording devices (AEGIS, VCR, Printers, etc.) Digital ultrasound video video information is sent to the DIMAQ DIMAQ workstation from the Coherent Imageformer Imageformer.. In the DIMAQ workstation, the information is stored in the proper memory locations of the system data memory.

Continued


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Theory

System Architecture Continued

From the system data memory, memory, data is passed to the Reconstruction Reconstruction Display Processor (RDP). Here, B-mode and Color Doppler data are combined, M-mode or pulse Doppler data are stored to strip displays, and graphics and data block information are overlaid. The data is then passed to the Input/Output Input/Output Video board (IOV). Here the data may be converted to a variety of video standards. Progressive RGB video video is provided provided to the internal monitor. monitor. Also, interlaced composite and component video are derived from the progressive progressive RGB. NTSC and PAL PAL video standards standards are supported.

Assembly and

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Acuson Seqouia 512

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Theory


DIMAQ Subsystem Control

The DIMAQ workstation provides the overall control of the system, including user interface and high level control of other processors which, in turn, control subsystems. The main processor is the System Supervisory Processor (SSP) and is located on the Reconstruction Display Processor Board (RDP). This processor communicates with the BDM and CN via the system control bus. The SSP can also communicate with the PIC board via the AUX Bus. This is used to configure the inputs and outputs from the PIC board as well as communicate with the SCSI devices on the system. Whenever a key is pressed or a knob is adjusted, the SSP interprets this data and configures the system accordingly. High level information about the scanning mode is passed to the CN board. The CN in turn configures the Coherent Imageformer to scan in a mode that reflects the users parameters.

Continued


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Theory


The SSP also sends high-level configuration information to the BDM. The BDM is configured to capture data from the Coherent Imageformer as appropriate for the scanning mode. When a change is made to the scanning parameters, the corresponding graphic element on the monitor is changed to blue while the transition to the new format is performed. When the system is displaying data as selected by the new parameters, the graphic element reverts to white. This allows the user to know precisely when the system has completed reconfiguration of the scan format.


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Acuson Seqouia 512

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Theory


User Interface

The User Interface provides the interface between the user and the Sequoia 512 system. One of the components of the User Interface is the FPP board. The FPP has a processor that monitors the status of the user controls, and when changes occur, sends an interrupt to the System Supervisory Processor (SSP) located on the RDP board. The SSP then initiates the sequence of events needed to configure the Sequoia system, as required. The User Interface is designed in a modular fashion. The FPP board mates to the switch assembly via stand-offs and hard connectors. The trackball, Qwerty (Alphanumeric keyboard), and DGC potentiometers assembly are connected with ribbon cables.


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Acuson Seqouia 512

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Theory

DIMAQ Workstation PCB’s

BDM (B-Mode System Data Memory)

Provides B-Mode/M-Mode acquisition and preprocessing of B-Mode and M-Mode data. Contains system data memory which stores all data passing through the Sequoia


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Theory

DIMAQ Workstation PCB’s Continued

CSD (Color Spectral Doppler)

Provides processing of Spectral, Audio, and Color Doppler data.


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Acuson Seqouia 512

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RDP (Reconstruction Display Processor)

Performs the translation of data from the acoustic grid to the display grid. Static and waveform graphics also reside on the RDP and are mixed with the acoustic data. Also contains the System Supervisory Processor (SSP) which provides primary control for the system.


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IOV (Input/Output Video)

Provides all video input and output functions, supplies VCR interface and audio sample rate conversions. Conversion between all video standards including NTSC, PAL, VHS, and S-VHS.


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IOE (Input/Output Expansion)

Performs JPEG compression of video data and handles all Ethernet activity. Communicates with the SSP via the Aux bus. Connectors provided to support future interfacing needs through the use of daughter cards.


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Acuson Seqouia 512

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PIC (Peripheral Interface Controller)

Provides connections for all standard supported peripherals. All signal lines are buffered. Hardware monitor circuitry is located here as well as the power on/off controls.


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Acuson Seqouia 512

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Theory


BF (Beamformer)

Provides digitization of individual receive signals. Beam formation including apodization, delay, gain, and interpolation. Summation of channels.


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CN (Controller)

Provides passband filter of signal. Focus Processor and Aquisition Control Processor are on the CN


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MX (Multiplexer)

Provides the interconnection between the transducer(s) and the Sequoia 512 System. Versatile multiplexing options for transmit and receive signals. Calibration paths for transmit and receive.


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RX (Receiver)

Provides amplification of individual receive signals as required. Spectral Doppler beamformer. Also provides system clocks.


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TX (Transmitter)

Provides fully programmable transmit channels.


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Power Subsystem

Primary AC Wiring

AC power is supplied to the system via a detachable, hospital-grade low-leakage power cord. Several cords are available for use in various countries. The AC power must be between 85 and 135 VAC or between 185 and 264 VAC. The power is fed into the DC Power Supply. This supply is circuit breaker protected and provides noise filtering of the AC power. The DC power supply has 11 distinct DC outputs and an AC accessory output. AC accessory output is power factor corrected within the Sequoia DC power supply. The AC accessory power is routed to the fan tray of the Sequoia 512 system where it is passed through a 6-A, dual-pole, circuit breaker. The power is then passed to a dual pole, single throw relay. This relay is controlled by the +12V peripheral output of the DC power supply. This allows the Sequoia 512 system to come up to full power before the peripherals are powered on. The power is then passed to a dual-pole, dual-throw switch. This switch is configured to select the AC input voltage to the peripheral isolation transformer.

Continued


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Power Subsystem Continued

Whenever any device connected to the primary side AC power is replaced, it is suggested that the leakage current to chassis ground of the system be measured and verified to be in compliance with the regulations of the country in which the system is being used. Devices connected to the primary AC power circuit are: • System power cord • DC power supply • Fan tray circuit breaker • Peripherals power relay • Peripherals voltage selection switch • Peripherals isolation transformer


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Power Subsystem Continued Power Configurations

The power supply architecture used by the Sequoia 512 system allows great flexibility with regard to use in different countries. The system can accept input voltages of 85-135 VAC or 185-264 VAC at 47-63 Hz. The power cord may be detached from the system power supply. The Sequoia DC power supply assembly requires no configuration. The power used by the monitor, PPS and peripheral recording devices is provided via an isolation transformer located in the fan tray. The input of this transformer must be set for 115 VAC or 230 VAC operation. Peripherals Power

The peripherals isolation transformer allows the use of peripheral equipment that is not normally approved for patient connection to be used. However, the peripheral must be plugged into the isolated outlets of the Sequoia 512 system. There are two coils on the primary side of the peripherals isolation transformer and three coils to the secondary side.


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System DC Power Distribution

The Sequoia 512 system receives power from the AC power cord. It goes through an internal 20-A dual pole circuit breaker and EMI filter. The DC power supply rectifies and down converts the supply voltage into ten static C voltages and two dynamic DC voltages. That is, two of the voltages are programmed as required by the Sequoia 512 system. One of the dynamic voltages is used to drive the cooling fans, the other is used to set the voltage available to the TX boards for transmit power. The Sequoia DC power supply is designed to provide a unity power factor correction. That is, no phase shift to the AC power will occur. The peripherals plugged into the AC Accessory Module have a power factor corrector circuit located in the Sequoia DC power supply. These DC supplies are routed to the Backplane via the DC power Harness.


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Power Supply Noise

The DC power supply is an extremely low-noise power supply. To minimize noise interference during imaging, the DC voltages are synchronized to 50 kHz. If the PS sync is lost, the power supplies will continue to operate, but the nonsynchronized switching of the supplies can cause harmonics, which may cause noise that adversely affects image quality. Power Supply Sync

Power Supply Sync is a 50 kHz clock generated on the RX board. It is used to synchronize the switching frequency of the power supplies within the system. Other clocks are derived from this clock to synchronize most electronics circuits within the system. This helps reduce the presence of power supply noise in the image.


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Programmable Power Supply

The Programmable Power Supply (PPS) provides a software programmable DC voltage used by the Transmitter boards (TX). This is done to minimize the heat dissipation requirements on the TX board and to increase overall system efficiency. The PPS may be programmed to output from 30 VDC to 250 VDC.

Power Fail Signal

A power fail signal is provided from the DC power supply. This signal allows the Sequoia 512 system to shutdown gracefully in the event that AC power is interrupted. The DC power supply can maintain power for 20 milliseconds after AC power is lost.


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Power Subsystem Continued Power-Up Sequence

Assuming that the system is plugged into an AC power outlet and the circuit breaker is switched on, there is standby power supplied to a latch located on the PIC board. Pressing the momentary power switch on the Sequoia 512 system sets the latch. The output of the latch is passed to a NOR gate where it is combined with the PIC RESET register. The true output of this latch is in turn OR'd with the output of the temperature monitor circuitry. Under normal circumstances, the result of these events allows the PS_PWR_ON request to go low, thereby enabling power to come up on the DC power supply. The 12V peripheral power comes up in approximately 150 milliseconds and it closes a relay in the fan tray, thereby applying AC power to the primary of the accessory isolation transformer. After the power has stabilized, the system reset is removed by the PIC. At this point, the system begins its boot sequence. One of the first steps performed is to write a 1 to the POWER_ON register located on the PIC. The output of this register is NOR'd with the power-on latch described above. In this way, the latch maintains the power on signal after the front panel switch is released and the power switch debounce latch returns to power switch-off state.


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Power Subsystem Continued Power-Down Sequence

Pressing the momentary power switch on the Sequoia 512 system sets the debounce latch on the PIC board. This causes an interrupt to be sent to the system, which tells that a power-down request has been initiated. The system then performs a power-down sequence that will include completing any disk accesses, closing all files that are open and any other housekeeping that is required. When the housekeeping functions are complete, the system writes a 0 to the power latch register located on the PIC board. This allows the PS_POWER_ON request to go high, resulting in the Sequoia DC power supply disabling all power except the standby power for the PIC power control circuitry. Special Power-Down Note: Turning off the circuit breaker or simply unplugging the system will result in a complete file system check at the following power-up. It may take up to several minutes to complete this operation. Important: You should always turn off the system using the power switch on the User Interface!


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Troubleshooting / Diagnostics


Important !

See service manual for complete systems diagnostics

Select a Troubleshooting / Diagnostics Topic

• Introduction and Overview General Approach Symptom Types • Causes of Failures and Quick Tips • Common Symptoms and Fixes • Function or Format Problems • System Lockup Problems • Image Quality Problems • Error Messages


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System Troubleshooting This section is provided to assist with troubleshooting major faults on the Sequoia 512 system. General Approach

• Note the event(s) that caused the failure • Identify the assemblies involved • Use any available tools to isolate between assemblies • Replace assemblies as needed until the problem is corrected Symptom Types

Failures on the Sequoia 512 system can be broken down into five main symptom types as follows: • No power • Functionality or image format problems • Locked-up systems • Image quality problems • Error messages


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Symptom Type

Following are the general characteristics of each symptom type: Symptoms Types Definition Symptom Type

No power Image format or functional problems Locked-up systems

Image quality problems

Error messages


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Definition The system does not turn on. There are no fans or lights. There are no raster lines on the monitor when the brightness and contrast are turned up. The system is still accepting keyboard commands, but the alphanumeric, graphic, or image format is missing, incorrect or displaced. The system no longer accepts keyboard commands (although you may still be able to get an image in the image area). These failures usually happen as you go from one mode into another, e.g., for instance going into or out of color imaging. The image format is correct, but there is a problem with the quality of the ultrasound signal coming out of the scanner. Examples could be that the image is defocused, poor penetration, channel dropouts, and excessive noise. The system responds with an error message as the result of a specific key being pressed. This implies that some operating condition of the system or its peripherals is being violated.

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Causes and Failures Here are some basic guidelines for troubleshooting the different symptom types: Causes of Failures Symptom Type

No power Functional or image format problems Hung or locked systems

Image quality problems Error messages


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Causes Typical power problems happen because power is not coming from the wall, the circuit breakers are off or, there is a failure in the power-on circuitry. These are cases where the microprocessors are communicating, but the boards themselves are not able to carry out the imaging or formatting instructions. System hang-ups or lock-ups are typically caused by a breakdown in microprocessor communications. They will typically happen as you are going from one mode into another, as multiple microprocessors try to communicate. Image quality problems usually relate to a failure in the Imageformer sections of the system. Maybe the transmitters are not focusing correctly, or the receive timing delays are incorrect. Error messages can happen for any number of reasons. They could be anything from a printer out of paper, to illegal transducer use.



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Quick Tips

The following are some useful tips, which may help in quick diagnosis of certain typical failures. Quick Tips Symptom Type

No power

Image format or functional problems Hung or locked systems Image quality problems Error messages


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Quick Tips The assemblies involved are the FPP, PIC, DC power supply, and any of the connecting cables. Is the system plugged into the wall? Does another instrument work in the same wall outlet? Has the plug come out of the system power cord bracket at the lower back of the system? Are the main breakers on? Are you pressing the correct power-on button? The power switch is located under and to the left of the monitor. The boards involved are the BDM, RDP, IOV, IOE, FPP, and PIC. The boards involved are the FPP, IOE, RDP, CN, BDM, CSD, and IOV. If it never gets to the imaging mode, it could also be the PIC or the hard drive. The boards involved are TX, MX, RX, BF, CN, CSD, and BDM. Check the User and the Peripheral Manuals for the meaning of error messages.



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Common Symptoms and Fixes

No Power The following table provides some quick checks when the symptom is No Power . No Power Check

If Any lights are lit.

DC Power supply LEDs LEDs are located behind the backplane door.

The monitor for raster lines Push the contrast and brightness pots and turn them all the way clockwise.


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Then System is getting power, but is not turning on.

Power-on light is off.

PIC is not turning on the power supply (could be FPP, power switch, PIC, or cables).

System is shutting itself off.

Could be the thermal sense circuitry.

Raster lines appear.

The monitor is getting power.



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Function or Format Problems The following table provides basic guidelines to troubleshooting format or functional problems. Format or Functional Problems If

Then Run the User interface Tests. (Refer to Chapter 7, Service Diagnostics.) It could be any of the image former boards or the BDM or RDP. Also, check to insure that a transducer is connected.

The user controls do not work. There are no images in the image area. There are no spectral or flow images in the image area AND there is a B-mode image. The image is misplaced. There are no graphics. There is missing or misplaced Physio information.

The peripherals do not function.

You cannot store and retrieve images.


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It could be the CSD. It could be the BDM or RDP. It could be the BDM or RDP. It could be the Physio Module, the IOE or the BDM. The system or peripherals may not be configured correctly. Press CODE-SETUP and refer to the User Manual for configuration information. It could be the PIC, the cables or the peripheral itself. Try another peripheral. It could be the MO drive, the PIC, the IOV or the IOE.


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System Lock-up Problems

The following table provides basic guidelines to system lock-up problems. System Lock-up Problems If

It never gets into imaging mode. It hangs only with some transducers. It only fails in B-mode. It fails only in Spectral Doppler or Color Doppler mode. It locks up when trying to access peripherals.


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Then It could be the RDP, PIC or hard drive. NOTE: Be sure to back-up the hard drive before replacing. (Refer to the User Manual.) Maybe the configuration is wrong. Press CODE-SETUP and refer to the User Manual for configuration information. It could be the CN, BDM, or RDP. It could be the CSD. Maybe the system or its peripherals are not configured correctly. Press CODE-SETUP and refer to the User Manual for configuration information.


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Image Quality Problems

Image Quality Problems

Problem Poor quality in any of the imaging modes

Poor B-mode quality


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Possible Causes Current application is not consistent with procedure being performed.

Possible Fixes Change to correct application.

The operator is new to the system.

The image may not be optimized. Contact the Acuson sales office for advice on Sequoia image optimization.

Poor video output.

Refer to Chapter 6, Service Diagnostics, and display the SMPTE test pattern. If there is a video problem, it is probably the IOV.

Bad Monitor Convergence.

Refer to Chapter 6, Service Diagnostics, and display the convergence test pattern. Replace the monitor as necessary. Slowly slide the probe across an ultrasound phantom. Look for dark areas in the image that do not move with the rest of the image. If artifacts are evident, replace boards in the imageformer section until the problem goes away (TX, MX, BF, CN, BDM).

Artifacts in the image area.

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Image Quality Problems Continued Problem Noise in the image

Poor quality from stored images Poor quality VCR video or audio

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Possible Fixes Replace imageformer boards as needed.

Noise in the power supply.

Use an oscilloscope to look for noise on the power supplies. Replace as needed.

EMI coming from external sources.

This is the most likely cause. Turn off lights and other equipment in the area to see if that solves the problem. Isolate the system as needed. It could be the IOV or the IOE. Try recording and playback with a new videotape.

Internal AEGIS boards. Bad (or old) video tape.

Poor image quality in only Spectral or Color Doppler


Possible Causes Noise in the Imageformer subsystem.

Functional Checks

Bad VCR.

Try a new VCR.

Bad video playback circuitry. Doppler only boards.

It could be the IOE or the BDM. It could be the CSD.



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Error Messages

The following table provides basic guidelines to troubleshooting certain error message conditions. Error Messages If The message indicates a failure of an assembly. It happened when accessing a peripheral.

Check For power-on errors

For the activity that caused the message

There were no external interfaces.


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Then Replace the failing assembly.

Refer to the peripheral manufacturer's user manual for more information. Refer to the Sequoia 512 User Manual for more information.

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Instructional Movies


Select a Movie for viewing

• Cover Removal • Monitor Removal • Keyboard / Trackball Removal • Filter Removal • Power Switch Cover Removal


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• Acuson Sequoia 512 Cover Removal


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• Acuson Sequoia 512 Monitor Removal


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• Acuson Sequoia 512 Keyboard / Trackball Removal


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• Acuson Sequoia 512 Filter Removal


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• Acuson Sequoia 512 Power Switch Cover Removal


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How To Use This

How To Use This Tool

Linking and Navigation Printing About This EPST Credits


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How To Use This

Linking and Navigation

On the bottom of each page, you will find a linking tool bar. Click on the sections icon to take you to that section. In addition to the linking tool bar on each page, you will find other links throughout the EPST. Blue Text

Takes you to supplemental information about that topic.

For additional navigation options, you may use the Acrobat Reader bookmark feature. To Display Bookmarks: • • •


Click on the PageWithLeftMargin button on the Acrobat toolbar to open the bookmark window. Click on the section or page listed in the bookmark window that you wish to view. Click on the PageWith LeftMargin button to close the bookmark window.

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How To Use This

Printing

1)

On the Acrobat toolbar, select File,Print

2)

Select whether to print all pages, only the current page, or a range of pages. (Default is Print All Pages)

3)

Click OK to begin printing


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How To Use This

About This EPST

•

The EPST is not intended to replace OEM system documentation. It also does not cover every problem or situation you may encounter while working on the system. There are probably many situations in which it would be helpful to refer to OEM system documentation.

•

The link icons located at the bottom of every page usually take you to the first page of that section.


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Credits

Project Sponsors:


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Self-Paced Training Materials

Self-Paced Training Materials

Note

There is no self-paced training available with this release of the Acuson Sequoia 512 EPST. However, we welcome suggestions for inclusion in the next release of this EPST.


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Parts Lists

Parts Lists

Select Item To View:

• Hard Drive • Disk drives • Filters • Power Supplies • Printed Circuit Boards • Transducer Accesories • Transducer Assemblies

Refer to the Service Manual for all other miscellaneous exterior and interior parts


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Parts

Hard Drive

Hard Disk Part Number 35189 35190 39014 43292 47183

Description BASE PLATE, MODULE, HARD DISK COVER, MODULE, HARD DISK HARD DRIVE, 1080MB, INTERNAL ASM DFB2 LABEL, B-CODE, HD ASSY, IGB, SEQUOIA

Continued


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Parts

Disk Drives

Disk Drives Part Number 39014 46536


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Description HARD DRIVE, 1080MB, INTERNAL 3 DISK, 230MB REWRITABLE OPTICAL 3



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Parts

Filters

Filters, Air Part Number 37531 40440


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Description FILTER PLATES (AIR FILTERS) FILTER, FAN, DISK BOX



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Parts Lists

Power Supplies

Power Supplies Peripheral Device

Part Number 37616 44288 31692 34766 18122 36523 42526

Circuit Breakers Components and Assemblies Fuse Supplies


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Description CKT BKR THRML 6A FUSHLDR STYLE CIRCUIT BREAKER, 0.2A, THERMAL RELAY DPDT 12V PWR XFMR PWR, ISO 550VA 115 / 230V FUSE, 5 AMP GLASS SLO-BLO POWER SUPPLY, 3.3V, 11 ASSY, PPS3 BOX, S


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Parts

Printed Circuit Boards Printed Circuit Boards Part Number 30132 31642 31642T 31732 31742 31992 32012 32052 32062 32082 33342 35062 35282 35662 35822 35992 35992

Description PCB ASSY, PIC PCB ASSY, FPC ASSY, TSTD FPP PCB, ASSY PCB, ASSY SS1M PCB ASSY, RI 128 PCB ASSY, RX2-R PCB ASSY, RDP PCB ASSY, BDM PCB ASSY, CSD PCB ASSY, IOV FAN TACHOMETER FILTER BOARD PCB ASSY, TX2 PCB ASSY, RI 64 CHANNEL PCB ASSY, PCB ASSY, CN2 PCB ASSY, FIZ ASSY, TSTD FIZ

Continued


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Parts

Printed Circuit Boards Continued

Part Number 36262 38102 39052 39052 39052 39152 39732 40222 40522 41382 42392 42532 44172 44772


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Description PCB ASSY, MX2-R PCB ASSY FPL PCB ASSY, MX2-C PCB ASSY, RX2-C ASSY, TSTD MX2-CARD PCB ASSY, BF3 ASSY, TSTD RX2, CARD PCB ASSY, TBS PCB ASSY, SS512 PCB, ASSY AUX PCB ASSY, BACKPLANE2 ASSY, TSTD PCB IOE3 PCB, ASSY DS4M2 ASSY, TSTD AAM2



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ACUSON Sequoia512.pdf

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