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6-3. DM-89 Board Replacement
13. RF Envelope Adjustment
Measuring equipment: Oscilloscope
(1) Connect and set the oscilloscope as follows:
CH-1:
TP203/DM-89(G-7), DC 500 mV/DIV, 5 ms/DIV, GND: E104/DM-89(G-5)
CH-2:
TP4/DM-89(E-1), DC 1 V/DIV, GND: E702/DM-89(D-1)
Trigger: CH-2, _ slope
(2) 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: 1RV205/DM-89(G-6)
A = 2.0 ± 0.2 V dc
Specification:
(3) Change the connection of the oscilloscope as follows:
CH-1:
TP403/DM-89(D-6), GND: E302/DM-89(B-5)
CH-2:
TP5/DM-89(D-1), GND: E702/DM-89(D-1)
(4) C 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: 1RV405/DM-89(C-6)
B = 2.0 ± 0.2 V dc
Specification:
(5) 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 "14. Search Picture Adjust-
ment".
6-60
A
B
0 V
0 V
DNW-A22/A22P
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