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6-3. DM-89 Board Replacement
(11) OXIDE Y adjustment
Playback the 75% color-bar signal portion (0:00 to 3:00) of the alignment tape CR5-2A or CR5-2A
PS, and perform the adjustment. (DNW-A22: CR5-2A, DNW-A22P: CR5-2A PS)
n
Adjust respactively for Y-A and Y-B channels.
When watching the Y-A channel, set the trigger of oscilloscope to _ slope.
When watching the Y-B channel, set to + slope.
Adjustment points: Y-A channel:
Y-B channel:
Specifications (Y-A and Y-B channels): D = 250 ± 20 mV p-p
(12) Eject the alignment tape CR5-2A/CR5-2A PS.
(13) To exit A30 : EQ VR, press the MENU button once on the lower control panel.
(14) Data save
Enter A3F : NV-RAM CONTROL of the maintenance mode, then execute "SAVE ALL ADJUST
DATA".
(15) Check that the message "Save Complete" is displayed on the video monitor.
(16) To exit A3F : NV-RAM CONTROL, press the MENU button once.
3. Cosine Equalizer Adjustment
n
If the network analyzer is not available, perform "4. Cosine Equalizer Provisional Adjustment".
Measuring equipment: Network analyzer and Oscilloscope (Refer to next figure.)
Oscilloscope
CH-2
IN
DM-89
TP
6-30
A30 : EQ VR : RF GAIN OXIDE-Y-A
A30 : EQ VR : RF GAIN OXIDE-Y-B
Center of V period
D
Network analyzer
SIG OUT
CH-2
INPUT
OUT
TP
Connection and Setting of Network Analyzer
A(*)MAG :
1 dB
B(*)DLY :
10 ns
.CF :
10 MHz
.SPAN :
20 MHz
.ST :
4.0 s
.IRG :
0 dB
.RBW :
10 kHz
.VBW :
10 kHz
.DR :
1 ns
.75 Z :
Output level :
200 ±30 mV
(at 9 MHz)
DNW-A22/A22P
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