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6-3. DM-89 Board Replacement
14. Search Picture Adjustment
Measuring equipment: Digital voltmeter and Oscilloscope
(1) Voltage measurement
Playback the color-bar signal portion (14:00 to 17:00) of the alignment tape CR5-1B or CR5-1B PS,
and measure the DC voltage level of the following measurement points using the digital voltmeter.
(DNW-A22: CR5-1B, DNW-A22P: CR5-1B PS)
Measurement point
TP500/DM-89(D-4)
TP502/DM-89(F-3)
TP702/DM-89(C-3)
(2) Turn RV507/DM-89(D-4) fully clockwise (2).
(3) Short-circuits TP506/DM-89(D-4) and E501/DM-89(E-3) with a shorting clip.
(4) Short-circuits TP700/DM-89(C-4) and E701/DM-89(D-3) with a shorting clip.
(5) Voltage adjustment
Playback the color-bar signal portion (14:00 to 17:00) of the alignment tape CR5-1B or CR5-1B PS,
and adjust the DC voltage level of the following measurement points using the digital voltmeter as
identical to measured voltage in step (1). (DNW-A22: CR5-1B, DNW-A22P: CR5-1B PS)
Measurement point
TP500/DM-89(D-4)
TP502/DM-89(F-3)
TP702/DM-89(C-3)
(6) Disconnect the shorting clip from TP506/DM-89(D-4) and E501/DM-89(E-3).
(7) Disconnect the shorting clip from TP700/DM-89(C-4) and E701/DM-89(D-3).
A
B
C
RV704
RV703
D902
ON
E303
TP8
TP7
TP6
S901
OFF
E901
TP704
E701
TP702
RV501
TP701
RV507
RV702
TP305
RV701
TP700
TP306
TP208
RV401
RV301
RV302
RV303
RV304
RV402
S302
RV406
S301
TEST
NOR
RV407
E302
TEST
NOR
TP303
TP304
RV405
TP403
TP404
TP302
TP300
E301
DM-89 Board (Side A)
6-62
Measuring value (fill up)
Adjustment point
1RV506/DM-89(E-4)
1RV501/DM-89(D-3)
1RV701/DM-89(A-4)
D
DM-89
E
F
G
OFF
ON
RV504
E105
TP5
S501
TP4
TP3
TP2
RV503
A No.
LOTNO,
S NO,
E702
TP1
TP705
TP505
TP503
TP504
TP502
E501
TP703
RV502
TP501
RV506
TP500
TP105
TP106
TP506
RV305
RV105
RV102
RV104
RV306
RV106
RV107
RV307
RV101
RV103
RV202
RV308
RV201
RV108
E104
E102
TP104
S102
TP103
TEST
NOR
S101
RV211
RV212
TP102
NOR
TEST
E103
TP202
RV205
TP204
TP100
TP203
E101
E902
Note
SPD OFFSET
Y DEEM
C DEEM
1
2
3
4
5
6
7
DNW-A22/A22P
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