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(12) Change the connection of the oscilloscope as follows:
CH-1: TP300/DM-89(B-7), GND: E301/DM-89(B-7)
CH-2: TP5/DM-89(D-1), GND: E702/DM-89(D-1)
(13) Playback the flat field signal portion (24:00 to 26:00) of the alignment tape CR5-1B or CR5-1B PS.
(DNW-A22: CR5-1B, DNW-A22P: CR5-1B PS)
(14) To operate the maintenance mode, press the MENU button once.
(15) Perform the METAL C adjustment.
n
Adjust respactively for C-A and C-B channels.
When watching the C-A channel, set the trigger of oscilloscope to _ slope.
When watching the C-B channel, set to + slope.
Adjustment points: C-A channel:
C-B channel:
Specifications (C-A and C-B channels): B = 380 ± 20 mV p-p
(16) To perform the tape operation, press the SET button once.
(17) Stop the playback of the alignment tape CR5-1B/CR5-1B PS, and eject it.
(18) Playback the flat field signal portion (0:00 to 3:00) of the alignment tape CR5-2A or CR5-2A PS.
(DNW-A22: CR5-2A, DNW-A22P: CR5-2A PS)
(19) To operate the maintenance mode, press the MENU button once.
(20) Perform the OXIDE C adjustment.
n
Adjust respactively for C-A and C-B channels.
When watching the C-A channel, set the trigger of oscilloscope to _ slope.
When watching the C-B channel, set to + slope.
Adjustment points: C-A channel:
C-B channel:
Specifications (C-A and C-B channels): C = 250 ± 20 mV p-p
(21) To perform the tape operation, press the SET button once.
(22) Stop the playback of the alignment tape CR5-2A/CR5-2A PS.
DNW-A22/A22P
A30 : EQ VR : RF GAIN METAL-C-A
A30 : EQ VR : RF GAIN METAL-C-B
Center of V period
B
A30 : EQ VR : RF GAIN OXIDE-C-A
A30 : EQ VR : RF GAIN OXIDE-C-B
Center of V period
C
6-4. EQ-56 Board Replacement
6-73
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