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SMPS NOTES A/C 220V/230V supply is given to the line filter section. A line filter coil is connected in this section which function to remove any noise that may come with the input AC supply. The filtered AC supply is received from the line filter section is given to the Bridge rectifier section converts the AC supply into High voltage DC supply. High voltage DC supply received from bridge rectifier section is given to the filter section when removes any ripples from the rectifier DC supply and forms a smooth DC supply. Two filter capacitors are connected in the filter section which function to filter the DC supply in this manner ,an unregulated high supply is received from the output of filter section. In a common types of SMPS this unregulated high voltage dc supply is converted into high frequency current pulses by switching transistor. When this high frequency current pulses pass through the primary winding of a transformer. AC Volts get induced in the secondary winding .But instead of using this technical in a computer SMPS an SM transformer is used. High frequency signal is given to its primary winding to get the necessary supplies from its secondary winding. This high frequency signal is generated by an oscillator section and this signal is amplified by driver section. amplified signal received from the driver section is given to the power output section through the driver transformer. The driver transformer functions as a coupling between the power output and power driver section. Amplified signal received from the power output section is given to the primary winding of the SM transformer through the secondary winding of protector transformer. AC volts are induced in the secondary winding of the SM transformer because of this high frequency pulses. The induced AC volts are rectified and regulated to get the necessary supplies that are used for the different section of the computer. As the high frequency signal which reaches the primary winding of the SM transformer passes through the primary winding of the protector transformer, volts get induced in it’s secondary winding also, whenever these some fault in the output supply such as a short circuit or if there is overloading of the power supply then the volts induced in the secondary winding of the protector transformer also register a change these volts induced in the secondary winding of the protector transformer are rectified and filtered before these are given to the protector section. Protector section sense the variation in these volts and cut off the output supplies whenever there is some fault in the output supply. Power supplies are two types: 1. AT powe powerr sup suppl ply. y. 2. AT ATX X pow power er suppl upply. y. 1.AT power supply:
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1. Powe Powerr good good sign signal al.. 2. +5v 3. +12v 4. -12v 5. GND 6. GND 7. GND 8 . GND 9. -5V 10. 10. +5V +5V 11. 11. +5V +5V 12. 12. +5V. +5V. 2.ATX Power supply:
SECTIONS OF POWER SUPPLY 1. 2. 3. 4. 5. 6.
Recti Rectifie fierr and and filt filter er sect section ion Output Output switch switching ing secti section on Oscilla Oscillator tor drive driverr and Error Error amplifi amplifier er secti section on Prot Protec ecto torr sect sectio ion n Output Output supp supply ly volta voltage ge secti section on Powe Powerr goo good d sec secti tion on.. WATTAGE REQUIREMENT OF DIFFERENT COMPUTERS
1. 2. 3. 4. 5. 6. 7.
For P.C P.C 65 65 Watt Wattag agee For For P.C P.C/X /XT T 120 120 WATT WATTAG AGE E For For P.C/ P.C/AT AT 286 286 150 150 WAT WATTA TAGE GE For For P.C/ P.C/ supe superr AT386 AT386 200 200 WATT WATTAGE AGE For For P.C/ P.C/48 486 6 250 250 WAT WATTA TAGE GE For For P.C/ P.C/P1, P1,P2 P2,P3 ,P3 300 WATTAGE WATTAGE For For P4 P4 450 450 WATT WATTAG AGE. E. TROUBLE SHOOTING
Note: 1. If any compo componen nents ts are open,ou open,output tput suppl supply y will be high. high. 2. If any capacit capacitors ors are are short short outpu outputt supply supply will will be low. low. 3. If any main main capacitors capacitors discharging discharging for using 47 ohms 5 watt wire wire wound resistor. 1.NO POWER: 1. chec check k the the powe powerr cab cable le 2. chec check k the the on/o on/off ff swi switc tch h
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1. check check the the main main capacito capacitorr voltag voltagee 330v 330v 2. check check the oscil oscillato latorr I.C and related related compon components ents 3. check the secondary secondary side side SM SM transformer transformer filter capacitor,diodes. capacitor,diodes. 4. check check the drive driverr tran transis sistor tor 3.SMPS working but no output: 1. check check the power power good good sect section ion 2. if any any compo component nentss is defectiv defective. e. If If defecti defective ve repla replace ce it. it. 3. check check the the prot protecto ectorr trans transisto istorr or IC 4. check check the the output output capacito capacitors rs and and diode diodes. s. 4.AC fuse blow off: 1. check check the bridg bridgee recti rectifie fierr 2. check check the main main filter filter cap capaci acitor tor 3. check check the the switc switchi hing ng trans transist istor or 4. check the related related components components of bridge bridge rectifier rectifier and and switching switching transistor. transistor. 5.System automatically restarted: 1. check check the input input capacito capacitors rs and check check the the output output capacito capacitors rs 2. check the all all capacitors capacitors which are surroundi surrounding ng of SMPS transformer. transformer. 3. check the oscillator oscillator and the the error amplifier I.C or related components. components. 6.System late starting: 1. check check the input input capacit capacitors ors and and repla replace ce it. it. 2. check check the output output capac capacito itors. rs.
CD ROM
The block diagram can be divided in two major areas.The control section and the driver section. The control section is dedicated to the peripheral interface it connects to the PC ‘s driver controller. The driver section electronics will manage all the CD-ROM’S physical operations As well as EMF decoding and error corruction. Driver circuitary converts and analog output from the layor diode. into an EMF signal, which is interm decoded into binary data and CIRC(cross interleaved read Solomon code) information. A drive controller chip and servo processor chip are responsible for directing laser focus, tracking sled motor control, spindle motor control and loading unloading motor control.
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Lense—it Lense—it is using using for Read Read/Writ /Writee the the data. data. Spindle Spindle motor motor—it —it is is using using for for spin spin the the CD/DVD CD/DVD Belt—it Belt—it is using using for locki locking ng the the tray &CD/D &CD/DVD VD locking locking Gear wheel wheel set--set--- it is using using for lockin locking g the tray tray &CD/DVD &CD/DVD locking. locking. Tray motor—it motor—it is using for moving moving the the tray from open open to close,close close,close to open Slid motor motor—it —it is using using for lence lence slide slide the top to bottom bottom,bot ,bottom tom to top. top. Data cables—it cables—it is using for data signals signals carring carring the MLC to lence or MLC to front panel.
CD Data transfer speed: 1. The data transfer speed is 150kilo bytes/sec Ex: 2x =300kb/sec 4x =600kb/sec 50x =7.5 mb/sec. Note: AT 50X CD with 650 MB of data can ideally by read in 86.7 seconds. 2.CD-ROM spindle motor speed is 200 and 500 rpm. DVD Data transfer speed: 1.DVD data transfer speed is 2.7MB/sec Ex: 12x = 16.2 mb/sec speed 16x =22.1 mb/sec speed Note: The drive also lists an interface rate of 33.3mb/sec by using ultra DM model 11 and 16.6mb/sec at multimode model-11. 2.DVD access time is 120 micro seconds to 200 microseconds. Carraying for CD’s: 1.Don’t bend the disk 2. Don’t heat the disk 3. Don’t scratch the disk 4. Don’t use chemical on the disk
Trouble Shooting: 1. chec check k the the belt elt 2. check check the gear gear whee wheell set set and and liver liver 3. check check the data data cables cables MLC MLC to lence lence,MLC ,MLC to to spindl spindlee 4. chec check k the the spin spindl dlee moto motorr 5. chec check k the the len lence ce 6. serv servo o pro proce cess ssor or Tray problem: a che check th the be belt
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WWW.UNLIMITEDTIPS4ALL.BLOGSPOT.IN check check the the data data cable cable from from MLC to to lence. lence. check check the the lenc lencee motor motor and and gear gear wheel wheel chec check k the the lenc lencee sha shaft ft chec check k the the disk disk moto motorr check check the the lence lence and replace replace the lence lence check check the Buffer Buffer IC to to lenc lencee WRITER/DVD ROM/WRITER not working( w orking(dead dead
check the power connector Dry solder the power connector • Check the voltages 5v,12v supply to MLC. • Note: 5v using for buffer IC IC and and 12v using for servo processor IC to disk motor,motor and front panel. Check the servo processor IC. • 5.Drive not detected: Check the IDE cable • Check the BIOS setup • Check the interface to buffer IC. • •
