Hitachi DV-RF7U Service Manual page 30

MONO
CHECK AUDIO MISSING
IN PLAY MODE
IC501-6
NO
IC301-76
AUDIO SIGNAL
AUDIO SIGNAL
YES
CHANGE IC501
NO
IC301-10
CHANGE IC301
AUDIO SIGNAL
YES
NO
IC301-9
CHANGE
AUDIO FM SIGNAL
IC301
YES
IC301-7
NO CHECK
MIX SIGNAL
R331, C353
(AUDIO+70KHz)
YES
NO
Q305
CHECK
OSCILLATION Q304, Q305, C354
YES
CHECK
ACE HEAD
YES
CHECK
C336, R322, R348
NO
NO
IC301-53, 54, 55
CHECK (CLOCK, DATA)
AUDIO MISSING
(VCR Section)
IN PLAY MODE
CHECK AUDIO
MISSING IN EE MODE
PLACE THE VCR IN
PB MODE
MONO
AUDIO SELECT
HIFI
CHECK
NO
IC501-24, 27 IC501-39(A.H D SW)
AUDIO FM(MIXED) CHANGE CYLINDER OR
IC501
YES
CHANGE
IC501
CHECK ACE HEAD
NO
IC301-3
C353, C348, R332
AUDIO SIGNAL
AND CHANGE IC301
YES
CHECK C349, R333 or
CHANG IC301
VCR Main PCB