Hitachi CM771ET, Service Manual

Page: 18 / 57

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