Philips SACD 1000/001 Service Manual page 50

GB 50 5. SACD 1000
5.7 Trouble shooting AV Board
Testing of A/V board can be done using diagnostic software "Player script".
Mono board is used to generate a sound with the sound tests PINKNOISE ON and SINE ON.
A VIDEO signal is generated with COLOUR-B ON.
Functional control of scart switching is also possible.
AUDIO PART
DAC UDA1328T
& FILTERING
Diagnostic Software
POWER SUPPLY?
YES
PCM_OUT[0:2]
LRCLK, SCLK
PCM_CLK
?
YES
AUDIO
AT OUTPUTS
OF DAC 7401
?
YES
AUDIO
CINCH OUTPUTS
Testpoint 15?
YES
LEVEL OK?
YES
YES
DISTORTION?
N0
DAC & FILTERING
OK
Diagnostic software, trouble shooting and test instructions
• To put set in "Player script", press keys
STOP+OPEN/CLOSE simultaneously and switch player on.
Proceed until display shows
• Press PLAY to execute.
During this test, an audio pink noise signal will be
sent to the audio cinches and the audio outputs of the
scarts..
• Check supply voltages 3V3(IC 7400), +8Vaud(IC 7304),
NO
-8Vstby(R3615), +12Vstby(T7333).
• Check flex connection to mono board.
• Check testpoints 7, 8, 9, 10, 12, 13.
NO
• Check flex connection to mono board
• Check mono board
• Check for analog signal at outputs of DAC IC 7401: pin
1,2,4,5,28,29,31,32 (testpoint 14).
NO
• Check DAC IC 7401
• Check VREFA on pin 30 of DAC 7401: 1.65V?
• Check OPAMPS 7403, 7408.
NO
• KILL: -8V DURING PLAY?
• Check ELCO'S 2456, 2462, 2475
• Check OPAMPS 7403, 7408.
NO
• Check resistors 3455, 3459, 3464, 3448, 3451, 3453
3479, 3475.
• Check DAC IC 7401
• Check C2455, C2459, C2461, C2464.
NP0 TYPE?
• Check OPAMPS 7403, 7408.
.
" PINKNOISE ON"
CL 06532152_090.eps
131200