Sony-CDPC741-cd-sm 维修电路原理图.pdf
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1、RadioFans.CN 收音机爱 好者资料库RadioFans.CN 收音机爱 好者资料库CDPC245 Subject DISC TABLE ROTATES SLOWLY - REPLACED ROTARY GEAR SYMPTOMS Disc table rotates slowly. RESOLUTION Replaced rotary gear B, operation restored to normal. 495728401 #66 GEAR, ROTARY B CDPC245 Subject DISC TABLE WONT STOP - REPLACED M801 SYMPTO
2、MS Disc table rotates continuously and cd player wont detect discs. Replaced flex cable and checked D801 sensor, player is still doing same thing. RESOLUTION Replaced Table motor assy and player restored normal operation. Repaired two units, CDPC245/CDPC345 with replacing M801. A4660322A M801 MOTOR,
3、 TABLE CDPC245 Subject DISK SKIPS INT. - REPL GEAR REF 66 SYMPTOMS Table would try to move and then would stop. found gear ref# 66 had teeth bent or worn. RESOLUTION Replaced gear ref. 66. 495728401 66 GEAR LOTARY B CDPC245 Subject HUMMING NOISE FROM MACHINE - ADD WEIGHT(S) TO BU ASSY SYMPTOMS As pe
4、r SBHFP0381, stated to add weight and screw to optic to eliminate noise. Works for some but not all. Noise originated from spindle motor assy X49175233. Hot glued to 2 weights 496297901 to left hand rear side of BU assy I cannot determine if this is a permanent fix or not, but it did eliminate the n
5、oise. Need to see if it affects skipping or if weights fall off. RESOLUTION As per our phone conversation, there has been some feedback that this weight mod doesnt work in all cases. As long as your solution stopped the noise and ultimately satisfied the customer I cant see a problem using the weigh
6、ts in this way. 496297901 N/A COUNTERWEIGHTS CDPC245 Subject INTERMITTENTLY DOES NOT RECOGNIZE DISCS SYMPTOMS Intermittently, unit will not recognize disc. Occurs in shuffle mode or checking discs. Unit will load and chuck discs w/o problem. No problem with alignment as describe in SB CSA13/#390. Tu
7、rntable appears to rotate a bit too fast. Logic from disc sensor and photo interrupter is counting teeth for position information looks good. Turntable rotating too fast for CPU to recognize data, slowing turntable down by changing value of R458 to750 ohm and R459 to 1K each resolves problem. This c
8、hanges reference voltage at IC451. RESOLUTION P/N for the 750 ohm resistor is 1-247-128-00. The P/N for the 1K ohm resistor is 1-249-417-11. CDPC245 Subject KSS240 BD BOARD, WRONG # SYMPTOMS When this board is ordered A4649433A to compliment the KSS240 optic it is the wrong board for this unit. Ther
9、e is no IC102 on the A side of the board. There is a totally different CN101 connector. Can you please explain why/send the correct board # RESOLUTION This is parts issue, I will forward this report to KCP. 4/4/95 - I have forwarded the two boards sent to me by G. Smith. I will wait for KCPs respons
10、e. 6/14/95 - According to WRPC the correct P/N for the BD board would be A4649890A. KCP checked against the samples that were sent and the new lot of boards are the correct type. A4649433A 152 COMPLETE BOARD CDPC245 Subject NO AUDIO SYMPTOMS Had no audio output on either channel. Found input to line
11、 amp Ic501 only showing a small sawtooth wave in. RESOLUTION Resolder D/A converter IC103. 875235545 IC103 D/A CONVERTER CDPC245 Subject NO OPEN/MECH NOISE - CD MECH STUCK AGAINST TABLE SYMPTOMS Unit open and makes mech. moise. After opening case found CD mech stuck with table B. RESOLUTION After fr
12、ee mech away from table B. 492638301 52 TABLE B DISK CDPC245 Subject TRAY MOTOR SPINNING BACKWARDS - REPLACE TABLE MOTOR SYMPTOMS Ran into this problem 5 times in past 3 weeks. Removed tray motor. Old motor is installed with lable on motor facing up. If new motor is installed with label facing up, m
13、otor and tray will spin backwards. If the tray is spinning in the wrong direction the unit will not play the correct disc. Ex: if disc 5 is requested disc 2 may be played. RESOLUTION When replacing this motor, I installed it with label facing down so it spins the correct way. Replaced motor because
14、of tray hitting the BU mech. Tried resistor mod but it did not work. If the mod doesnt work, tray motor will usually fix the problem. A4660322A M801 DISC TABLE MOTOR CDPC345 Subject BU MECH POPPING OUT OF CAM GEAR IN THE UP POSITION SYMPTOMS BU mech came out of cam gear in the up position causing th
15、e door not to open and unit to jam up. RESOLUTION As per Tech Dept saying this doesnt happen, here is a record of one happening. This unit WO# WH125136 is a dealer stock unit (Graffiti). Is it possible this unit was factory shipped with the BU mech in the down position, the BU popped out due to ship
16、ping in this position, the unit was sold with the mech already out of the U/D gear. The customer brought the unit home, tried it (plugged it in tried to play a disc), the gears rotated, the unit was returned - you got the unit with the BU up? CDPC345 Subject INCOMPLETE TURNTABLE MOVEMENT - SHAFT OF
17、GEAR, REF#66, BENT SYMPTOMS After replacing IC401, R457, R458, R459 per SVC Bulletin, CSA13, the disc turntable still moved irregularly, demonstrated jerking movement. RESOLUTION The motor under the turntable used to drive the wormgear and gear (#61 X4943-479-1 and #66 4-957-284-01). The shaft of th
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