Zenith ABV341 Series Service Manual page 49

B. Audio abnormal
AUDIO ABNORMAL
Check Audio jack.
YES (If OK)
Check MPEG_CLK Signal
(IC501 Pin22) of MPEG part.
YES (If OK)
Refer to Audio part.
YES (If OK)
Refer to MPEG part.
YES (If OK)
Replace Main B/D.
D. Open/Close abnormal
Check the connection of MD.
YES
OPEN/CLOSE ABNORMAL
Check Front.
Check the
connection of PDV02.
NO
Check PMD03 Pins 5, 6.
YES
Refer to SERVO part.
C. Video abnormal
VIDEO ABNORMAL
Check Video jack.
Refer to Video part.
Refer to MPEG part.
Replace Main B/D.
YES (If OK)
NO
YES
3-59
YES (If OK)
YES (If OK)
YES (If OK)
Reconnect it.