Philips CD721 - Page 17

FAULTFINDING GUIDE
PCS 60 683
POWER SUPPLY CHECK: FUSES
MAINSTRANSFORMER
VOLTAGES: AC DC FTD
SAFETY RESISTORS
DISPLAY CHECK: COMMUNICATION uP - FTD
WIRING
DISPLAY DRIVER
MICROPROCESSOR 7700
SEE FAULTFINDING GUIDE OF CDM-12
CHECK: POWER SUPPLY
SAFETY RESISTORS 3113,3115
1.C.7100 (SAA7345)
CHECK: POWER SUPPLY
SAFETY RESISTORS 3280,3302,3303
.C.7280 (TDA1845)
OPAMP 7300
CHECK: TESTPOINT 95,96
KILL CIRCUIT ON POWER SUPPLY
TRANSISTORS 7360,7361
KILI ON PIN 16 OF L.C.7700
KILLL, KILLA ON PIN 27, 26 OF I,C.7100
TRANSISTORS 7364,7365
(CHECK: 1.C.7280 (TDA1545)
SEE SPECIFICATIONS MEASUREMENT
CHECK: PIN 12 uP 7700
OPAMP 76004
TRAY MECHANISM
WIRING
CHECK: OPAMP 7370
KILL CIRCUIT 7362, 7363
POTM 3376,JACKBUS 1371
WIRING
CHECK: IR. RECEIVER 1040
PIN 37 OF I.C. 7700
GO TO SERVICE MODE
PRESS PLAY
ERROR MESSAGES
HAS1123
9345