Samsung MM-D530D, Руководство по обслуживанию

Страница: 23 / 43

4-4 Samsung Electronics
Troubleshooting
4-1-2 No Output
Check MAIN PCB
IC9 (STA321) output signal
Pin 38, 39, 37, 36
Check MAIN PCB
IC9 (STA321)
1
Check MAIN PCB IC9 Pin 19
: Low Mute; High Normal
Check AUX IC9 Power/GND pattern
and signal pattern
Check MICOM IC21
Pin 44: Low Normal, High Mute
Yes
No
Yes
No
Yes
No
SPK No output
Check signal input of AUX-R/L pattern
(from JACK521)
Replace IC9
Check MAIN PCB
L1S31: +24V, L1S30: -24V
Check power pattern
Yes
No

Refer to wave pattern
image of Fig. 4-3.