NAD L55, Service Manual

Page: 19 / 55

2-10
FOCUS ON?
Check
the focus error moving the
lens up and down.
(IC2A1 Pin 42)
Does the
TTL level change at IC201
Pin 78 and 132 moving
the lens?
Does the disc turn?
IC201 Pin169 is "High"?
Is OK the track jump.
Does the signal
pulse appear at IC2A1 Pins
39, 29?
Does the screen appear?
OPEN/CLOSE
Replace
µ
-COM or IC201.
Replace IC201.
Check IC2A1 Pin 11,12,13,14
in DVD Mode
Fig.3. FOCUS ERROR waveform
IC201 no output : Pick-up is defective.
Check IC201 and IC2M1 when PMD03 Pin 6 is abnormal
Check IC2M1 Pin 21, PMD03
Pin 6 turn when the IC2M1
Pin 21 is less than 2.2V.
Check A
Video Part is defective.
Check "5.MPEG Circuit."
Check "7.OSD/Video Circuit."
Replace
µ
-COM part.
IC2A1 is defective.
DISC IN
C.
END
NO
NO
NO
NO NO
NO
NO
NO
YES
YES
YES
YES
YES
YES YES
YES