Read Sony CFM-A50 Service Manual online
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TUNER SECTION
AM Section
Function switch : RADIO
Band switch
Band switch
: AM (US model)
MW or LW (AEP, UK model)
MW or LW (AEP, UK model)
Volume
: MIN
FM Section
Function switch : RADIO
Band switch
Band switch
: FM
Volume
: MIN
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
done by the trimmer capacitors.
( ) : AEP, UK only
AM IF ALIGNMENT
Adjust for a maximum reading on level meter.
T1
455kHz
AM (MW) FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
520kHz
CT1 – 2
1,780kHz
(1,680kHz)
AM (MW) TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L6 (L6 – 1)
620kHz
CT1 – 1
1,400kHz
Tape Speed Adjustment
Procedure :
1. Mode : Playback (Normal Speed)
Procedure :
1. Mode : Playback (Normal Speed)
2. Adjust RV103 so becomes the adjustment value below.
3. Set to slow playback switch (S105) ON mode.
3. Set to slow playback switch (S105) ON mode.
Confirm that the become adjustment value as to follows.
Adjustment Value :
Speed checker
Digital frequency counter
–1 to +1%
2,970 – 3,030Hz
Frequency difference between the beginning and the end of the tape
should be within 1.5% (45Hz).
should be within 1.5% (45Hz).
Adjustment Location :
set
test tape
WS-48B
(3kHz, 0dB)
WS-48B
(3kHz, 0dB)
32
Ω
speed checker
LFM-30 or
digital frequency
counter
LFM-30 or
digital frequency
counter
J101 (Earphone jack)
[DECK CONTROL BOARD]
(Component side)
(Component side)
RV103 : Tape speed Adjustment
AM RF signal
generator
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
signal.
Output level : as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
set
32
Ω
J101 (Earphone jack)
level meter
FM RF signal
generator
generator
22.5kHz frequency deviation by
400Hz signal.
Output level : as low as possible
400Hz signal.
Output level : as low as possible
telescopic
antenna
terminal
antenna
terminal
0.01
μ
F
set
32
Ω
J101 (Earphone jack)
level meter
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