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(9) Change the connection of the oscilloscope as follows:
CH-1:
TP4/DM-89(E-1), GND: E702/DM-89(D-1)
CH-2:
TP105/DM-89(E-1), GND: E105/DM-89(G-1)
(10) METAL Y adjustment
Playback the flat filed signal portion (24:00 to 26:00) of the alignment tape CR5-1B or CR5-1B PS,
and perform the adjustment. (DNW-A22: CR5-1B, DNW-A22P: CR5-1B PS)
Adjustment point: 1RV105/DM-89(F-4) and 1RV106/DM-89(F-5)
Specification:
D > 40 dB
fc
7.6 MHz
DNW-A22
(11) Stop the playback of the alignment tape CR5-1B/CR5-1B PS or eject it.
n
It is not necessary to eject the alignment tape when perform subsequent "8. Demodulator Limiter
Balance Adjustment".
A
B
C
RV704
RV703
D902
ON
TP8
TP7
TP6
E303
S901
OFF
E901
TP5
TP704
TP702
TP701
RV702
TP305
RV701
TP700
TP306
TP208
RV401
RV301
RV302
RV303
RV304
RV402
S302
RV406
S301
TEST
NOR
E302
RV407
TEST
NOR
TP303
TP304
RV405
TP403
TP404
TP302
TP300
E301
DM-89 Board (Side A)
DNW-A22/A22P
D
2fc
15.3 MHz
D
DM-89
E
F
G
E105
OFF
ON
RV504
S501
TP3
TP2
TP1
RV503
A No.
LOTNO,
S NO,
E702
TP4
TP705
TP505
TP503
TP504
E701
TP502
TP703
E501
RV501
RV502
TP501
RV507
RV506
TP500
RV305
TP105
TP106
RV306
TP506
RV105
RV102
RV104
RV106
RV107
RV101
RV103
RV202
RV201
RV307
RV108
E104
E102
RV308
S102
TP103
TEST
NOR
S101
RV211
RV212
TP102
TEST
NOR
E103
TP202
RV205
TP204
TP100
TP203
E101
E902
1
2
3
4
5
6
7
6-3. DM-89 Board Replacement
fc
D
2fc
8.9 MHz
17.7 MHz
DNW-A22P
6-45
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