Hitachi CM801U Service Manual - Page 26

Deflection

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2. SYNCHRONIZATION IS NOT OBTAINED Relevant circuit : Sync. input circuit, Deflection circuit H. Sync. is not obtained. 1304, 1701, 1702, Q701, Q702, D35Z or D30Z Turn the FHOH ADJ VR (R724) or FHOL ADJ VR (R721)or FHLL ADJ VR (R726) Abnormal Normal H, sync. or V. Sync Normal V. Sync. is not obtained. Change the C97(B) Video/V Board) 1205, 1304,1701, D331 or D311, D362 or D361 Change the C97(B) Video/V Board) D773, 1701, 1702 3. VERTICAL SINGLE LINE Relevant circuit : Horizontal output circuit Microprocessor Unit is damaged. Change the Microprocessor Unit. or 1703, 1001 5. COLOR DOES NOT APPEAR Relevant circuit : Video amplifier circuit Check the input signal. Abnormal Normal Check OV the voltage of 12V Normal (12V) Trouble outside the character monitor D983, 1981 (Change the C97(B) Main Board) DY faulty, Q800, D771, Q764, Q760 4. HORIZONTAL SINGLE LINE Relevant circuit : Vertical deflection circuit Check the Voltage on pin 8 of 1630 Others 23-25V '4 Check the Voltage on pin 1 of 1630 Others 13-15V Check the Voltage on pin 24 of 1701 3.5V and over C982, D982, 1982,1987, 1630, DY Change the C97(B)Video/V Board) 1630, D63Z, D64Z (Change the C97(B) Video/V Board) 1701, Q601 (Change the C97(B} Main Board 1701, 1631,1633, 1632, Q631 Q650,I630 (Change the C97(B) Video/V Board) Check OV the voltage of 1205 Q21R, (Change the C97(B) Video/V Board) Normal (3,5V) Check the voltage of 1201 30 pin Abnormal Check the voltage of 1201 17 pin Normal (1.5-4.0V) Abnorma l Microprocessor Unit is damaged. Check the voltage of 1203 2 pin Abnormai Change the Mic- roprocessor Unit. (or 1051) 1204, Q251, Q252 1 Nomal (0-5V) (Change the C97(B) Video Check OV the voltage of 1202 4 pin Normal (4V) 1201 (Change the C97(B)Video/V Board) Normal (30-75V) 1203 (Change the C97(B) Video/V Board) Note : Trouble in the red circuit is shown in this diagram as representative color. Refer to : when green does not appear, and when blue does not appear. 121R, Q23R (Change the C97(B) Video/V Board)

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2.
SYNCHRONIZATION
IS
NOT
OBTAINED
Relevant
circuit
:
Sync.
input
circuit,
Deflection
circuit
5.
COLOR
DOES
NOT
APPEAR
Relevant
circuit
:
Video
amplifier
circuit
Turn
the
H.
Sync.
is
not
obtained.
1304,
1701,
1702,
Q701,
Q702,
D35Z
or
D30Z
Check
the
input
Abnormal
Change
the
C97(B)
Video/V
Board)
signal.
FHOH
ADJ
VR
(R724)
or
FHOL
ADJ
VR
Abnormal
H,
sync.
V.
Sync.
is
not
obtained.
1205,
1304,1701,
or
(R721)or
FHLL
ADJ
VR
(R726)
V.
Sync
D331
or
D311,
D362
or
D361
Normal
Change
the
C97(B)
Video/V
Board)
Normal
Normal
3.
VERTICAL
SINGLE
LINE
Relevant
circuit
:
Horizontal
output
circuit
DY
faulty,
Q800,
D771,
Q764,
Q760
4.
HORIZONTAL
SINGLE
LINE
Relevant
circuit
:
Vertical
deflection
circuit
Check
the
Voltage
on
pin
8
of
1630
23-25V
'4
Check
the
Voltage
on
pin
1
of
1630
13-15V
Check
the
Voltage
on
pin
24
of
1701
Others
D773,
1701,
1702
Microprocessor
Unit
is
damaged.
Change
the
Microprocessor
Unit.
or
1703,
1001
Others
C982,
D982,
1982,1987,
1630,
DY
Change
the
C97(B)Video/V
Board)
3.5V
and
over
1630,
D63Z,
D64Z
(Change
the
C97(B)
Video/V
Board)
1701,
Q601
(Change
the
C97(B}
Main
Board
1701,
1631,1633,
1632,
Q631
Q650,I630
(Change
the
C97(B)
Video/V
Board)
Check
the
voltage
of
12V
Normal
(12V)
Check
the
voltage
of
1205
OV
Trouble
outside
the
character
monitor
OV
Normal
(3,5V)
Check
the
voltage
of
1201
30
pin
Abnor-
mal
Normal
(1.5-4.0V)
Check
the
voltage
of
1202
4
pin
OV
Check
the
voltage
of
1201
17
pin
Normal
(4V)
D983,
1981
(Change
the
C97(B)
Main
Board)
Q21R,
(Change
the
C97(B)
Video/V
Board)
Microprocessor
Unit
is
damaged.
Abnor-
Check
Abnor-
Change
the
Mic-
ma
l
the
voltage
of
1203
mai
roprocessor
Unit.
(or
1051)
2
pin
Nomal
(0-5V)
Normal
(30-75V)
1203
(Change
the
C97(B)
Video/V
Board)
Note
:
Trouble
in
the
red
circuit
is
shown
in
this
diagram
as
representative
color.
Refer
to
:
when
green
does
not
appear,
and
when
blue
does
not
appear.
1204,
Q251,
Q252
(Change
the
C97(B)
Video
1
1201
(Change
the
C97(B)Video/V
Board)
121R,
Q23R
(Change
the
C97(B)
Video/V
Board)