Sony DNW-A22 Maintenance Manual page 205

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:
B channel:
Specifications (A and B channels): See the table below.
Frequency Specification for DNW-A22
7T BAR Reference: 100% {0 dB}
1 MHz Adjust : 94 (100 to 89)%
0.2 MHz Check : 100 (106 to 71)% {0
0.5 MHz Check : 100 (106 to 71)% {0
1.5 MHz Check : 80 (106 to 71)%
7T BAR 0.2
100%
DNW-A22
(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.
DNW-A22/A22P
A32 : DM VR 1 : EQ1 METAL-C-A
A32 : DM VR 1 : EQ1 METAL-C-B
{_0.5 ±0.5 dB}
+0.5
dB}
_3.0
+0.5
dB}
_3.0
+2.5
{_2.0 dB}
_1.0
0.5 1 1.5 2 [MHz]
Frequency Specification for DNW-A22P
8T BAR Reference: 100% {0 dB}
1.5 MHz Adjust : 93 (102 to 85)%
0.2 MHz Check : 100 (106 to 71)% {0
0.5 MHz Check : 100 (106 to 71)% {0
1 MHz Check : 100 (106 to 71)% {0
2 MHz Check : 80 (106 to 71)%
8T BAR 0.2 0.5 1 1.5 2
100%
DNW-A22P
6-3. DM-89 Board Replacement
{_0.6 ± 0.8 dB}
+0.5
dB}
_3.0
+0.5
dB}
_3.0
+0.5
dB}
_3.0
+2.5
{_2.0 dB}
_1.0
[MHz]
6-53