Fm Scan Stop Adjustment; Clock Frequency Adjustment - Sony ICF-SW77 Service Manual
Lw/mw/sw/fm stereo pll synthesized receiver
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Also See for ICF-SW77:
- Operating instructions manual (35 pages) ,
- Specifications (2 pages) ,
- Operating instructions manual (35 pages)
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ICF-SW77
FM Scan Stop Adjustment
Setup:
Band Selector:
FM
VOLUME Control:
Arbitrary
Clock Frequency Adjustment (Microcomputer board)
Note:
When X802 or X803 is replaced, it is necessary to adjust the clock
frequency of IC related to the replaced crystal.
Setup:
FMRFSSG
FM ANT terminal
lPin®ofCN1
\
\ on SIGNAL board, j
Frequency Deviation:
± 22.5 kHz
Carrier Frequency:
93.025 MHz
Output Level:
0.5m V (54 dB)
oscilloscope
frequency counter
•
IC801 Clock Frequency Adjustment
1.
Connect the regulated dc power supply to the microcomputer board.
2.
Press and keep on pressing S801 (TIME SET key).
(Activates 2 MHz clock.)
3.
Adjust CT801 for 2,008.0 ±0.2 kHz reading on the frequency
counter.
Note:
When S801 is released, 2 MHz clock will stop about 1 second
later.
•
IC802 Clock Frequency Adjustment
1.
Connect the regulated dc power supply to the microcomputer board.
2.
Turn radio on by pressing S806 (ON/OFF key).
3.
Adjust CT802 for 2,008.0 ±0.2 kHz reading on the frequency
counter.
Procedure:
1.
Tune the set to 93 MHz.
2.
Adjust RV301 for 1.5 V down point on the oscilloscope.
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