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(8) Connect and set the oscilloscope as follows:
TP1/DM-89(E-1), DC 1 V/DIV, 10 µs/DIV, GND: E702/DM-89(D-1)
CH-1:
(9) Gain adjustment
Playback the color-bar signal portion (14:00 to 17:00) of the alignment tape CR5-1B or CR5-1B PS
in the following modes, and perform the adjustment and check.
(DNW-A22: CR5-1B, DNW-A22P: CR5-1B PS)
For DNW-A22
Playback mode
Normal
REW
+24 times speed
Normal playback
A
(100%)
For DNW-A22P
Playback mode
Normal
+24 times speed
REW
Normal playback
A
(100%)
(10) 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 "15. Guard Band Width
Adjustment".
DNW-A22/A22P
Specification
Reference A: 100% (0 dB)
B = 100 ±3 % (0 ± 0.2 dB)
C = 100 ±10 % (0 ±1.0 dB)
REW mode playback
B
DNW-A22
Specification
Reference A: 100% (0 dB)
B = 105 ±5 % (0.4 ± 0.4 dB)
C = 100 ±10 % (0 ±1.0 dB)
+24 times speed play back
B
DNW-A22P
Adjustment point
_
1RV507/DM-89(D-4)
Check only
+24 times speed play back
C
Adjustment point
_
1RV507/DM-89(D-4)
Check only
REW mode playback
C
6-3. DM-89 Board Replacement
6-63
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