6-55
DNW-A22/A22P
OXIDE C adjustment [to step (19)]
(17) Connect the osilloscope to TP8/DM-89 (C-1).
GND: E702/DM-89 (D-1)
(18) Playback the multiburst signal portion (3:00 to 6:00) of the alignment tape CR5-2A or CR5-2A PS,
and adjust the level (R-Y signal) at specified frequency part by table below.
And check that levels at others are with specifications.
(DNW-A22: CR5-2A, DNW-A22P: CR5-2A PS)
n
The CTDM signal is displayed on the oscilloscope. The timing order of signal is REF SYNC, R-Y,
B-Y. As these signals are overlapped the outputs of A and B channels, adjust/check in each channel.
Adjustment points: A channel:
A32 : DM VR 1 : EQ1 OXIDE-C-A
B channel:
A32 : DM VR 1 : EQ1 OXIDE-C-B
Specifications (A and B channels): See the table below.
DNW-A22
DNW-A22P
(19) Observer the B-Y signal, confirm that the B-Y signal levels at every frequencies are within specifi-
cations shown above.
If the B-Y signal is out of specifications are not satisfied, perform the fine adjustment so that both
frequency response of R-Y and B-Y output signals satisfy the above specifications.
(20) Eject the alignment tape CR5-2A/CR5-2A PS.
(21) To exit A32 : DM VR 1, press the MENU button once.
Data save [to step (24)]
(22) Enter A3F : NV-RAM CONTROL of the maintenance mode, execute “SAVE ALL ADJUST
DATA”.
(23) Check that the message “Save Complete” is displayed on the video monitor.
(24) To exit A3F : NV-RAM CONTROL, press the MENU button once.
(25) Reset No.2 (C MUTE) of S1/TBC-23 (B-1) to OFF.
6-3. DM-89 Board Replacement
Frequency
Specification for DNW-A22
7T BAR
Reference: 100% {0 dB}
1 MHz
Adjust : 94 (100 to 89)%
{
_
0.5
±
0.5 dB}
0.2 MHz
Check : 100 (106 to 71)%
{0
+
0.5
dB}
_
3.0
0.5 MHz
Check : 95 (106 to 71)%
{
_
0.4
+
0.9
dB}
_
2.6
1.5 MHz
Check : 80 (106 to 71)%
{
_
2.0
+
2.5
dB}
_
1.0
Frequency
Specification for DNW-A22P
8T BAR
Reference: 100% {0 dB}
1 MHz
Adjust : 94 (102 to 86)%
{
_
0.5
±
0.8 dB}
0.2 MHz
Check : 100 (106 to 71)%
{0
+
0.5
dB}
_
3.0
0.5 MHz
Check : 100 (106 to 71)%
{0
+
0.5
dB}
_
3.0
1.5 MHz
Check : 84 (106 to 71)%
{
_
1.5
+
2.0
dB}
_
1.5
7T BAR
0.2
0.5
1
1.5
2 [ MHz]
100%
8T BAR
0.2 0.5 1 1.5 2
[MHz]
100%
