Data Demodulation Circuit Adjustment - Sony CA-550 Maintenance Manual

3-3-10. DATA Demodulation Circuit
Adjustment
Note :
• Use a plastic core driver to adjust 1LV.
Equipment : Oscilloscope
Test Point : TP201 (GND:E1)/TR-90 (D-4)
Adjustment Point : 1LV200/TR-90 (D-3)
: C = 4.9 ±0.1 V
Specifications
4
TR
A
B
C
TP201
D
E
F
G
TR-90 BOARD (COMPONENT SIDE)
CA-550
CA-550P
3 2 1
LV201
RV200
TP200
LV200
E1
3-3-11. H CONT Demodulation Circuit
Adjustment
Note :
• Use a plastic core driver to adjust 1LV.
Equipment : Digital voltmeter or Oscilloscope
DC variable power supply
Frequency counter
Preparations :
• Set the POWER switch of the CA-550/550P to OFF.
• CCU-700/700P/700A/700AP setting
Extend the AT-88 board of the CCU.
Supply +2.5 Vdc to pin C19 (GND:E1)/extension board
(extending AT-88) from the DC variable power supply.
Observing the frequency counter, adjust the DC variable
power supply so that the frequency at TP1 (GND:E2)/
AT-88 (G-7) is 2.500 ±0.005 MHz.
Test Point : TP81/extension board
(extending TR-90)
Adjustment Procedures:
1. Set the POWER switch to CCU/EXT.
2. Connect between TP59 and TP90/extension board
(extending TR-90).
3. Adjustment Point : 1LV201/TR-90 (B-2)
: 2.5 ±0.2 V.
Specifications
4. Disconnect TP90 and connect between TP59 and GND
A.
5. Adjustment Point : 1RV200/TR-90 (C-2)
: 2.5 ±0.2 V
Specifications
3-3. TR-90 Board Adjustment
3-9 (E)