Samsung MM-DA25 Service Manual page 13

4-1-2 No Output
No Output
Check Signal
at FIC1 (R2S15904) on MAIN PCB
(Pin 26, 27 → 1KHz)
Yes
Check Mode on
AAIC1 (Pin 23)
(L: Mute, H: Normal)
High
Check Voltage on
AAC6 (+22V or +15V)
AAC7 (-22V or -15V)
Yes
REPLACE AAIC1
Samsung Electronics
No
 Refer to wave pattern
image of Fig. 4-1.
Low
No
Check Signal
in MAIN PCB FIC2
(Pin 1, 7 → 1KHz)
Yes
 Refer to wave pattern
image of Fig. 4-1.
PARTS OPEN/SHORT
MICOM UIC1
Pin 47 (L: Normal, H: Mute)
Pin 48 (H: Normal, L: Mute)
SMPS CHECK
Troubleshooting
No
OUTPUT CHECK
4-3