Sony DNW-A22 Maintenance Manual page 206

6-3. DM-89 Board Replacement
OXIDE Y adjustment [to step (16)]
(14) Observe the video output signal at the composite waveform monitor.
(15) Playback the multiburst signal portion (3:00 to 6:00) of the alignment tape CR5-2A or CR5-2A PS,
and adjust the level at specified frequency part by table below.
And check that levels at others are within specifications.
(DNW-A22: CR5-2A, DNW-A22P: CR5-2A PS)
n
As the Y output is overlapped the output A and B channels on the composite waveform monitor.
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
0.5 MHz Reference: 100% {0 dB}
2 MHz Adjust : 100 (104 to 95)%
1 MHz Check : 100 (106 to 50)%
3 MHz Check : 89 (106 to 50)%
4.1 MHz Check : 71 (106 to 50)%
0.5
100%
DNW-A22
(16) Playback the multiburst signal portion (3:00 to 6:00) of the alignment tape CR5-2A or CR5-2A PS,
and confirm that the output level difference between A and B channels is hardly noticeable at high
frequency (4.5 MHz) part.
n
If the output level difference at 4.5 MHz is noticeable, perform the adjustment of A34 : DM VR 3 :
SUB-OXIDE-A or -B. Be sure to adjust for the lower level signal only as following steps 1 to 5
on a playing back the multiburst signal portion (3:00 to 6:00) of the alignment tape.
1 To exit A32 : DM VR 1, press the MENU button once.
2 Enter A34 : DM VR 3 of the maintenance mode.
3 Change the data value of SUB OXIDE-Y-A (A channel side), and judge a lower level channel.
4 If the B channel side is lower, return the data value of SUB OXIDE-Y-A to the formerr data,
then adjust (add to the data value) the SUB OXIDE-Y-B until the level at 4.5 MHz of B channel
is equal to the level at 4.5 MHz of A channel.
If the A channel side is lower, adjust (add to the data value) the SUB OXIDE-Y-A until the
level at 4.5 MHz of A channel is equal to the level at 4.5 MHz of B channel.
5 To exit A34 : DM VR 3, press the MENU button once.
6-54
A32 : DM VR 1 : EQ1 OXIDE-Y-A
A32 : DM VR 1 : EQ1 OXIDE-Y-B
+0.3
{0 dB}
_0.4
+0.5
{0 dB}
_6.0
+1.5
{_1.0 dB}
_5.0
+3.5
{_3.0 dB}
_3.0
1 2 3 4.1 4.5 [MHz]
Frequency Specification for DNW-A22P
2T BAR Reference: 100% {0 dB}
3 MHz Adjust : 89 (100 to 79)%
0.5 MHz Check : 100 (106 to 50)% {0
1 MHz Check : 100 (106 to 50)% {0
2 MHz Check : 100 (106 to 50)% {0
4.1 MHz Check : 71 (106 to 50)%
2T BAR 0.5 1
100%
DNW-A22P
{_1.0 ±1.0 dB}
+0.5
dB}
_6.0
+0.5
dB}
_6.0
+0.5
dB}
_6.0
+3.5
{_3.0 dB}
_3.0
2 3 4.1 4.5 [MHz]
DNW-A22/A22P