Marantz SA12 - Video Part; No Picture Cvbs & Y;C out

39
VIDEO PART OK
Diagnostic Software
NO PICTURE
CVBS & Y/C OUT
POWER SUPPLY?
Check testpoints 20-21.
Check SCART SWITCH IC 7305.
Check I2C (testpoints 22,23).
Check Y/C VIDEO buffer transistor 7302, 7303.
Check testpoint 19.
Check CVBS VIDEO buffer transistors 7301, 7300, 7310.
Check testpoints 1-6
Check flex connection to mono board
Check mono board
Check supply voltages +8Vstby, –8Vstby, +12Vstby,
+6Vstby.
Check voltage regulator 7304
Check safety resistors 3615, 3516
Check flex connection to mono board.
NO
YES
VIDEO
CONN. 1300
CONN. 1301
?
NO
NO
YES
YES
NO
YES
VIDEO
Y/C OUT
?
VIDEO
CVBS CINCH
?
To put set in “Player script”, press keys
STOP+OPEN/CLOSE simultaneously and switch mains on.
Proceed until display shows “
COLOUR-B ON ".
Press PLAY to execute.
VIDEO PART