Sony PLM-A55E, Service Manual

Page: 30 / 70

– 30 –
CN404 pin
6
(B OUT)
CN404 pin
1
(GND)
+
–
Oscilloscope
(DC range)
RG-46P Board
[R Gain Adjustment]
Note: The view angle correction must be turned off.
Before this adjustment, the Contrast Adjustment must be finished.
Condition:
Input signal
Chroma signal, and color bar signal with burst
signal turned off
Measurement point RG-46P board CN404 pin
4
and pin
8
Measuring equipment Oscilloscope
Adjustment page D
Adjustment address 23
Specification value ± 0.05 V
Connection:
Adjustment Procedure:
(1)
Select EXT. VIDEO AUDIO mode, and picture and tone qual-
ity standard setting. (See page 22)
(2) View angle correction OFF: Connect CN404 pin
2
(EAC OFF)
and pin
1
(GND) on the RG-46P board.
(3) Connect CH1 of oscilloscope to the CN404 pin
4
, and CH2
to the CN404 pin
8
on the RG-46P board.
(4) Set (or confirm) data: 01 to page: 1, address: 00.
(Cancel D page protect)
(5) On page: D, address: 23, change data with the PLAY and STOP
buttons and press the PAUSE button to write data so that a
difference between
D
' level of waveform on the CH2 of os-
cilloscope and
D
level (
D
level of Contrast Adjustment) on
the CH1 satisfies the specification value.
Adjustment and Adjustment Parts: RG-46P board (see page 33)
Ch1 Ch2
CN404 pin
4
(G OUT)
CN404 pin
1
(GND)
RG-46P Board
Oscilloscope
(DC range)
CN404 pin
8
(R OUT)
CN404 pin
1
(GND)
D
'
2H
[Burst Cleaning Adjustment]
• When Anti-pal signal is available, perform the adjustment shown
below.
When it isn’t available, fix the data Page: D, address: 36 on A0h.
Note: The view angle correction must be turned off.
Condition:
Input signal Anti-pal signal (Anti-pal signal is included in
special color-bar signal and so on.)
Measurement point RG-46P board CN404 pin
6
Measuring equipment Oscilloscope
Adjustment page D
Adjustment address 36
Specification value less than 100 mV
Connection:
Adjustment Procedure:
(1)
Select EXT. VIDEO AUDIO mode, and picture and tone qual-
ity standard setting. (See page 22)
(2) View angle correction OFF: Connect CN404 pin
2
(EAC OFF)
and pin
1
(GND) on the RG-46P board.
(3) Connect an oscilloscope to the CN404 pin
6
on the RG-46P
board.
(4) Set (or confirm) data: 01 to page: 1, address: 00.
(Cancel D page protect)
(5) On page: D, address: 36, change data with the PLAY and STOP
buttons and press the PAUSE button to write data so that the
noise width (
G
in figure) becomes the minimum.
Adjustment and Adjustment Parts: RG-46P board (see page 33)
G
2H