C Pll Set Adjustment; B-Y Demod Carrier Balance Adjustment - Sony CCU-TX7 Service Manual

4-4-2. C PLL Set Adjustment

Note : Make sure that 45 MHz frequency on the YM-15
board (CA-TX7/TX7P) is correct.
Equipment : Oscilloscope
To be extended : YD-26 board
Test point : TP15 (GND: E8)/YD-26 board
Adjusting point : 1RV14 (PLL SET)/YD-26 board
: A = 0 ± 30 mV dc
Specification
E1
RV1
Y AGC CONT
YD-26
Y 2'nd AGC
S3
E4
TP1
E3
CCU-TX7 (E)/V1
A
GND
TP26
SAMPL GATE
RV3
SAMPL S/H
RV4
E2
TP2 Y OFFSET ADJ
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
4-4-3. B-Y DEMOD Carrier Balance
Adjustment
Equipment
To be extended : YD-26 board
Preparation :
. S4 (C 2nd AGC)/YD-26 board → "OFF"
Test point
Adjusting point : 1RV11 (B-Y CARR BAL)/
Specification
V
E5
TP10
TP11
RV8
Y LEVEL
RV9
RV6
E6
TP12 RV17
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
: TP17 (GND: E8)/YD-26 board
YD-26 board
: Adjust so that the waveform level of
SAMPLE pulse is maximum.
Maximum
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