Sony CA-755 Maintenance Manual page 44

2-5. RX-37 Board Adjustment
2-5-1. PLL Free Run Frequency Adjustment
2-5-2. Return Video Level Adjustment
2-5. RX-37 Board Adjustment
Preparations :
1. Connect a test signal generator to the RET connector
on the CCU rear panel with a BNC cable. (75 Z-
terminated)
2. Set the test signal generator as follows.
. 5-STEP or 3-STEP
. LINEALITY
. APL 50 %
. STD
. B/W
2-5-1. PLL Free Run Frequency Adjustment
Board : RX-37 board
Equipment : Oscilloscope
Test signal generator
Test point : TP3/RX-37 board
Adjustment point : 1LV2/RX-37 board
: 4.60 ± 0.05 V dc
Specifications
2-18 (E)
2-5-2. Return Video Level Adjustment
: S2/IF-607 board → ON
Preparation
Board : RX-37 board
Equipment : Waveform monitor/
Oscilloscope (75Z-terminated)
Test signal generator
Test point : RET OUT connector
(CA-755/755P)
Adjustment point : 1RV1 (VIDEO LEVEL)/
RX-37 board
: 1.00 ± 0.05 V p-p (75Z)
Specifications
1
2
TP1
3
4
E1
LV1
5
CN2
6
A B
RX-37 BOARD (A SIDE)
TP2
LV2
TP3
RV1
TP4 E2
TP5
D E
C
CA-755/755P