Magnavox NB500MG9 Service Manual page 24

FLOW CHART NO.19
Audio is not outputted. (JK2701)
Set the disc (with 5.1ch Audio) on the disc tray, and playback.
Are the analog audio signals outputted to each pin
of CN2701?
CN2701 4PIN FRONT-AUDIO(L)
CN2701 2PIN FRONT-AUDIO(R)
CN2701 9PIN SURROUND(L)
CN2701 7PIN SURROUND(R)
CN2701 13PIN CENTER
CN2701 11PIN SUB WOOFER
Are the analog audio signals inputted to each pin
of IC2700, IC2701 and IC2702.
IC2700 2, 6PIN FRONT-AUDIO(L/R)
IC2701 2, 6PIN SURROUND(L/R)
IC2702 2, 6PIN CENTER/SUB WOOFER
Are the analog audio signals outputted to each pin
of IC2700, IC2701 and IC2702.
IC2700 1,7PIN FRONT-AUDIO(L/R)
IC2701 1,7PIN SURROUND(L/R)
IC2702 1,7PIN CENTER/SUB WOOFER
Do the mute signals of CN2701 become to
"H" level?
→ CN2701
FRONT-AUDIO(L)
FRONT-AUDIO(R) → CN2701
→ CN2701
SURROUND(L/R)
→ CN2701
CENTER
→ CN2701
SUB WOOFER
Is the analog audio signal of each line outputted to
each terminal of JK2701 (as shown below) ?
IC2700 1PIN → JK2701 FRONT(L)-OUT
IC2700 7PIN → JK2701 FRONT(R)-OUT
IC2701 1PIN → JK2701 SURROUND(L)-OUT
IC2701 7PIN → JK2701 SURROUND(R)-OUT
IC2702 1PIN → JK2701 CENTER-OUT
IC2702 7PIN → JK2701 SUB WOOFER-OUT
No
Yes
No
Yes
No
Yes
No
5PIN
1PIN
6PIN
14PIN
10PIN
Yes
No
Replace the BE Main CBA or FE Main CBA &
BD Mechanism Assembly.
Check each line between each pin of CN2701
and each pin of IC2700, IC2701 and IC2702
and service it if defective.
CN2701 15,13PIN → IC2700 2,6PIN FRONT-AUDIO(L/R)
CN2701 11,9PIN → IC2701 2,6PIN SURROUND(L/R)
7,5PIN → IC2702 2,6PIN CENTER/SUB WOOFER
CN2701
Replace ICs (IC2700, IC2701 or IC2702).
Replace the BE Main CBA Unit.
Check each line and service it if defective.
1-8-7 E5E20TR