6-53
DNW-A22/A22P
METAL C adjustment [to step (11)]
(9) Observe the CTDM signal after connecting the oscilloscope to TP8/DM-89 (C-1).
GND: E702/DM-89 (D-1)
(10)Playback the multiburst signal portion (8:00 to 11:00) of the alignment tape CR5-1B or CR5-1B PS,
and adjust the level (R-Y signal) at specified frequency part by table below.
And check that levels of others are whitin specifications.
(DNW-A22: CR5-1B, DNW-A22P: CR5-1B PS)
n
The timing order of CTDM signal is REF SYNC, R-Y,
B-Y. As these signals are overlapped the output of A and B channels, adjust/check in each channel.
Adjustment points: A channel:
A32 : DM VR 1 : EQ1 METAL-C-A
B channel:
A32 : DM VR 1 : EQ1 METAL-C-B
Specifications (A and B channels): See the table below.
DNW-A22
DNW-A22P
(11)Observe the B-Y signal, confirm that the B-Y signal levels at every frequencies are within specifica-
tions shown above.
If the B-Y signal is out of specifications, perform the fine adjustment so that both frequency response
of R-Y and B-Y signals satisfy the above specifications.
(12)Eject the alignment tape CR5-1B/CR5-1B PS.
(13)Set No.2 (C MUTE) of S1/TBC-23 (B-1) to ON.
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 : 100 (106 to 71)%
{0
+
0.5
dB}
_
3.0
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}
1.5 MHz
Adjust : 93 (102 to 85)%
{
_
0.6
±
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 MHz
Check : 100 (106 to 71)%
{0
+
0.5
dB}
_
3.0
2 MHz
Check : 80 (106 to 71)%
{
_
2.0
+
2.5
dB}
_
1.0
8T BAR
0.2 0.5 1 1.5 2
[MHz]
100%
7T BAR
0.2
0.5
1
1.5
2 [MHz]
100%
