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Hitachi H972 Service Manual page 18

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2. Synvhronization is not obtained
Relevant circuit : Sync. input circuit, Microprocessor, Deflection circuit
Check
H.SYNC and V.SYNC of
I101 8pin and 9pin
normal
Check
H.SYNC and V.SYNC of
I701 15pin and 14pin
normal
3. Vertical single line
Relevant circuit : Horizontal output circuit
DY faulty, Q801, D763, Q764, Q765
4. Horizontal single line
Relevant circuit : Vertical deflection circuit
Check the
voltage on pin 3 of
I601
13~15V
Check the
voltage on pin 7 of
I601
53~56V
Check the
voltage on pin 24 of
I701
Normal
abnormal
abnormal
Others
Others
Vertical sawtooth is
not obtained
H.SYNC is
not
H.Sync.
obtained
or
V.Sync.
V.SYNC is
not
obtained
 18 
I101, I104, I201, I302
Q320, D26Z, D35Z
(Change the DJ72 Video
Board or Main Board)
I101, I104, I201, I302, Q320
D19Z, D27Z, D36Z
(Change the DJ72 Video
Board or Main Board)
I104,I701
(Change the DJ72 Main
Board)
I101,I701
(Change the DJ72 Main
Board)
DY, C974, D764, D975, I601,
I971, Q763, Q764
(Change the DJ72 Main Board)
C973, D604, D605, D974,
I601, R610
(Change the DJ72 Main Board)
I701
(Change the DJ72 Main Board)
C602, C603, C621, I601,
R603, R604, R621, R622
(Change the DJ72 Main Board)

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