B-Y Out Level Adjustment; R-Y Demod Carrier Balance Adjustment - Sony CCU-TX7 Service Manual

4-4-6. B-Y OUT Level Adjustment

Equipment : Oscilloscope
To be extended : YD-26 board
Preparation :
. S4 (C 2nd AGC)/YD-26 board → "ON"
Test point : TP17 (GND: E8)/YD-26 board
Adjusting point : 1RV12 (B-Y LEVEL)/YD-26 board
: A = 350 ± 5 mV p-p
Specification
E1
RV1
Y AGC CONT
YD-26
Y 2'nd AGC
S3
E4
TP1
E3
CCU-TX7 (E)/V1
A
TP26
SAMPL GATE
RV3
SAMPL S/H
RV4
E2
Y OFFSET ADJ
TP2
TP5
TP8
TP4 TP7
Y RF TUNE
VCO DC SET
TP6
RV2 RV5
TP9
LV1
BLACK S/H SYNC S/H
TP17
TP3
RV12
S4
C 2'nd AGC
B-Y LEVEL
E7
B-Y CARR BAL
RV11
TP14
TP13
RV10
C AGC CONT
RV13 RV14
OFFSET ADJ PLL SET
S2
CABLE LENGTH
S1
4-4-7. R-Y DEMOD Carrier Balance
Adjustment
Equipment
To be extended : YD-26 board
Test point
Adjusting point : 1RV16 (R-Y CARR BAL)/
Specification
E5
TP10
TP11
RV8
Y LEVEL
RV9
RV6
E6
RV17
TP12
R-Y LEVEL
E8
E9
R-Y CARR BAL TP19
RV16
TP16
TP15
RV18
90° SET
RV15
C CAR LEV
E16
TP21 TP20
YD-26 Board
(A SIDE)
: Oscilloscope
: TP18 (GND: E9)/YD-26 board
YD-26 board
: Adjust 1RV16 so that the negative DC
level is maximum.
GND
Maximum
(Negative DC level) _
4-21