Sony DNW-A100 Maintenance Manual page 159

1. Pedestal level Adjustment
(1) Connect as connection 2.
n
When the board suffix No.is -11, it is required to extend the DEC-65 board with the extension board.
Wait for 30 seconds after turning off the power, then perform the extension.
(2) Input the lamp signal from the signal generator.
(3) Observe the burst signal portion of VIDEO OUTPUT COMPOSITE 2 output with the waveform
monitor or oscilloscope.
Setting of measurement equipment
. Waveform monitor
SWEEP: 1 H, MAG
x5
GAIN:
UNCAL: MAX
. Oscilloscope
DC 0.5 mV/DIV, 2 us/DIV
CH-1:
Band-width limit: ON
(4) Adjust that the waveform of the pedestal portion satisfies the specification.
Board suffix No. is -12 and higher:
Board suffix No. is -11:
VIDEO OUTPUT COMPOSITE 2
Before adjustment
A B C
A B C
1
DECORDER
CLOCK GEN
2
3
4
5
6
7
Suffix No. -12 and higher
DNW-A100/A50/A45
DNW-A100P/A50P/A45P
Adjust 1RV300 on the DEC-65 board.
Adjust 1RV2 on the DUS-722 board.
After adjustment
Specification: Check that the difference of the pedestal
D E F G
DEC-65E
D F G
RV30 0
1
2
3
4
ANALOG INPUT
5
6
7
portion is not recognized.
A B C
A B C
1
DECORDER
CLOCK GEN
2
3
EVR
4
5
6
7
Suffix No. -11
4-1. DEC-65 Board (BKDW-505/506)
D E F G
D DEC-65E F G
1
2
3
4
DUS-722
ANALOG INPUT
R V2
5
6
I C2 0 3
7
4-5