Sony CA-755, Maintenance Manual

Page: 35 / 132

2-9 (E)
CA-755/755P
2-3-7. R-Y/B-Y DC Balance Adjustment
Preparations :
.
S1/MD-117 board
→
ON
.
S2/MD-117 board
→
ON
To be extended : MD-117 board
Equipment :
Oscilloscope (LIMITER
→
OFF)
Test point :
TP10/MD-117 board
GND : E1/MD-117 board
Adjustment points :
1
RV9 (R-Y DC BAL)/
MD-117 board
1
RV10 (B-Y DC BAL)/
MD-117 board
Adjustment Procedure :
Adjust
1
RV9 and
1
RV10 alternately until the V BLKG
portions are flat.
V rate
2-3-8. 45 MHz VCO Adjustment
Preparations :
.
Disconnet the DC IN connector.
Connect the CA-755/755P to the CCU with the triaxial
cable and turn on the POWER switch of the CCU.
.
Perform the following adjustment a minute or more after
turning on the power.
To be extended : MD-117 board
Equipment :
Digital voltmeter
Test point :
TP8/MD-117 board
Adjustment point :
1
RV7 (VCO ADJ)/MD-117 board
Specifications : 3.0
±
0.5 V dc
2-3. MD-117 Board Adjustment
2-3-7. R-Y/B-Y DC Balance Adjustment
2-3-8. 45 MHz VCO Adjustment