Main Clock Section - Sony ICF-CD873 Service Manual

MAIN CLOCK SECTION

Main Clock Adjustment
Connection:
MAIN board
TP (+5 V)
TP401 (4.194 MHz)
TP GND (SHIELD)
Adjustment jig:
+5 V
1 M Ω
0.5 pF
IN
47 uF 1 M Ω
+
GND
Procedure:
1. Connect the frequency counter as the above figures.
2. Adjust CT401 for 4.2495 MHz reading on the frequency
counter.
Specified Value: 4.2490 to 4.2500 MHz
adjustment
jig
+5
OUT
IN
10 : 1 probe
GND
GND
100 k Ω 100 k Ω
1000 pF
OUT
GND
INVERTER
(TC7W04F)
frequency counter
+
–
– 12 –