Sony CFS-903L - Page 4

3-2. RADIO SECTION
AM SECTION
Procedure: Setting:
Mode: playback FUNCTION switch: AM (MW/LW/SW)
Tape Speed Adjustment
speed checker
LFM-30 FINE TUING: mechanical mid
or AM ff signal
digital frequency generator
test.
tape
sounter
Put
the
lead-wire
WS-48A
antenna
close
to
(3kHz,
OdB)
pe
the
set.
322 oO
a Pe |
Headphones jack
CS ed
30% amplitude
modulation by
400Hz_ signal
VIVM
(range: 0.5-5V ac)
Adjustment Value:
+3% 2,910 to 3,090 Hz
Frequency difference between the beginning and the end of
the tape should be within 1.5% (45Hz).
Headphones jack
¢ Repeat the procedures in each adjustment several times, and
the frequency coverage and tracking adjustments should be
finally done by the trimmer capacitors.
Adjustment Location: AM IF ADJUSTMENT
Adjust for a maximum reading on VTVM.
adjustment resistor
M301
LS:MW FREQUENCY COVERAGE
Adjust for a maximum reading on VIVM.
160kHz 260kHz L7:LW FREQUENCY COVERAGE
L8:SW TRACKING
*
7MHz
*: Extend telescopic antenna
fully.
FM SECTION
Setting: VCO Adjustment
FUNCTION switch: FM
FM ft signal Procedure:
generator
. FM ff signal
telescopic generator
antenna
400Hz, 30% FM modulation
frequency deviation +22.5kHz
output level: as low as possible
Carrier frequency: 98MHz telescopic
Modulation : no modulation antenna lead
Output level: 0.1V (100dB)
1. Connect frequency counter to TP (VCO).
2. Tune the set to 98MHz.
3. Adjust RV1 for 76kHz+500Hz reading on the frequency
counter.
Adjustment Location: tuner board (component side)
frequency counter
r-CT6:SW FREQUENCY COVERAGE
CT7:LW FREQUENCY COVERAGE
TI:AM IF °
Li:FM TRACKING
L2:FM FREQUENCY COVERAGE
CT2:FM FREQUENCY COVERAGE
A [o]
» a. @
| &
L3:MW TRACKING
CT1:FM TRACKING
RV1:FM VCO
CT10:LW TRACKING
L10:LW TRACKING
CT3:MW TRACKING
CT4:MW FREQUENCY COVERAGE