Sony CA-755, Maintenance Manual

Page: 34 / 132

2-8 (E)
CA-755/755P
2-3-5. B-Y Video Level Adjustment
Preparations :
.
S1/MD-117 board
→
OFF
.
S2/MD-117 board
→
ON
To be extended : MD-117 board
Equipment :
Oscilloscope
Test point :
TP7/MD-117 board
GND : E1/MD-117 board
Adjustment point :
1
RV3 (B-Y LEVEL )/
MD-117 board
Specifications :
A : B = 3 : 4
(Tolerance of 1% or better)
2-3-6. R-Y/B-Y Carrier Balance Adjustment
Preparations :
.
S1/MD-117 board
→
ON
.
S2/MD-117 board
→
ON
To be extended : MD-117 board
Equipment :
Oscilloscope
Test point :
TP10/MD-117 board
GND : E1/MD-117 board
Adjustment points :
1
RV5 (R-Y CARRIER BAL)/
MD-117 board
1
RV6 (B-Y CARRIER BAL)/
MD-117 board
Specifications : Adjust
1
RV5 and
1
RV6 alternately
so that the carrier is minimum.
2-3. MD-117 Board Adjustment
2-3-5. B-Y Video Level Adjustment
2-3-6. R-Y/B-Y Carrier Balance Adjustment
A
B
C D E F
G
1
2
3
4
5
6
7
8
9
10
MD-117 BOARD (A SIDE)
CN1
RV4
RV2
RV3
RV10
RV11
RV8
RV7
RV1
TP10
TP11
TP5
TP6
TP7
TP4
TP9
TP1
TP2
TP8
E1
TP3
RV5
RV6
RV9
E2