Sony CA-755 Maintenance Manual page 35

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
: Oscilloscope (LIMITER → OFF)
Equipment
Test point : TP10/MD-117 board
GND : E1/MD-117 board
Adjustment points : 1RV9 (R-Y DC BAL)/
MD-117 board
1RV10 (B-Y DC BAL)/
MD-117 board
Adjustment Procedure :
Adjust 1RV9 and 1RV10 alternately until the V BLKG
portions are flat.
CA-755/755P
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
Equipment
Test point
Adjustment point : 1RV7 (VCO ADJ)/MD-117 board
Specifications
V rate
2-3. MD-117 Board Adjustment
2-3-7. R-Y/B-Y DC Balance Adjustment
2-3-8. 45 MHz VCO Adjustment
: MD-117 board
: Digital voltmeter
: TP8/MD-117 board
: 3.0 ± 0.5 V dc
2-9 (E)