Zenith XBV243 series Service Manual page 34

TROUBLESHOOTING (CONTINUED)
C.
DISC IN
DISC IN
OPEN/CLOSE
FOCUS ON?
YES
Does the disc turn?
YES
IC201 Pin169 is "High"?
YES
Is OK the track jump.
YES
Does the screen appear?
YES
END
VR168 - 923-03485
ELECTRICAL
Check the focus error
NO
movingthe lens up and
down. (IC2A1 Pin 42)
YES
Does the TTL level change
at IC201 Pin 78 and 132
moving the lens?
YES
Replace µ-COM or IC201.
NO Check IC2M1 Pin 18, PMD03
Pin 6 turn when the IC2M1
Pin 21 is less than 2.2V.
NO
Check A
NO
NO
Video Part is defective.
Check "5.MPEG Circuit."
Check "7.OSD/Video Circuit."
Fig.3. FOCUS ERROR waveform
NO
Check IC2A1 Pin 11,12,13,14
in DVD Mode
IC201 no output : Pick-up is defective.
NO
Replace IC201.
Check IC201 and IC2M1 when PMD03 Pin 6 is abnormal
Does the signal
pulse appear at IC2A1
Pins 39, 29?
YES
Replace µ-COM part.
3-22
NO
IC2A1 is defective.
D35E COMBO - ELECTRICAL