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6-3. DM-89 Board Replacement
(4) Change the connection of the oscilloscope as follows:
CH-1:
TP5/DM-89(D-1), GND: E702/DM-89(D-1)
CH-2:
TP305/DM-89(C-1), GND: E302/DM-89(B-5)
(5) OXIDE C adjustment
Playback the pulse and bar signal portion (9:00 to 11:00) of the alignment tape CR5-2A or CR5-2A
PS, and perform the adjustment. (DNW-A22: CR5-2A, DNW-A22P: CR5-2A PS)
Adjustment point: 1RV307/DM-89(F-5) and 1RV308/DM-89(F-5)
Specification:
B > 35 dB
fc
4.9 MHz
DNW-A22
(6) Eject the alignment tape CR5-2A/CR5-2A PS.
(7) METAL C adjustment
Playback the flat field 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:
Specification:
fc
5.8 MHz
DNW-A22
(8) Stop the playback of the alignment tape CR5-1B/CR5-1B PS.
6-44
B
2fc
9.8 MHz
1RV305/DM-89(F-4) and 1RV306/DM-89(F-5)
C > 40 dB
C
2fc
11.6 MHz
fc
2fc
4.9 MHz
9.8 MHz
DNW-A22P
fc
2fc
6.7 MHz
13.4 MHz
DNW-A22P
B
C
DNW-A22/A22P
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