Sony CA-550, Maintenance Manual, Page: 37 / 114

3-9 (E)
CA-550
CA-550P
3-3-10. DATA Demodulation Circuit
Adjustment
Note :
• Use a plastic core driver to adjust
1
LV.
Equipment : Oscilloscope
Test Point : TP201 (GND:E1)/TR-90 (D-4)
Adjustment Point :
1
LV200/TR-90 (D-3)
Specifications :
C = 4.9
±
0.1 V
3-3-11. H CONT Demodulation Circuit
Adjustment
Note :
• Use a plastic core driver to adjust
1
LV.
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.
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 :
1
LV201/TR-90 (B-2)
Specifications :
2.5
±
0.2 V.
4. Disconnect TP90 and connect between TP59 and GND
A.
5. Adjustment Point :
1
RV200/TR-90 (C-2)
Specifications :
2.5
±
0.2 V
TR-90 BOARD (COMPONENT SIDE)
3-3. TR-90 Board Adjustment
A
1 2 3 4
B
C
D
E
F
G
TR
LV200
TP201
TP200
RV200
LV201
E1