Read Sony CFD-Z125 / CFD-Z135 Service Manual online
— 18 —
• 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.
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
455kHz
TUNER SECTION
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
signal.
Output level : as low as possible
AM RF SSG
0.01
µ
F
FM RF SSG
FM telescopic
antenna terminal
antenna terminal
75kHz frequency deviation
by 1 kHz signal.
output level : as low as possible
by 1 kHz signal.
output level : as low as possible
set
3.2
Ω
set
+
–
level meter
SPEAKER terminal (JK302)
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
520kHz
CT4
1,780kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
600kHz
CT3
1,400kHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
97.5MHz
CT2
108.5MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
90MHz
CT1
106MHz
Adjustment Locastion: MAIN board (See page 19.)
VCO Adjustment
Procedure:
1. Connect the frequency counter to pin
4 of IC1 as shown the
figure below.
2. Tune the set to 98MHz.
3. Adjust RV1 for 75.95kHz to 76.05kHz reading on the frequency
3. Adjust RV1 for 75.95kHz to 76.05kHz reading on the frequency
counter.
Adjustment Locastion: MAIN board (See page 19.)
0.01
µ
F
FM RF SSG
FM telescopic
antenna terminal
antenna terminal
Carrier frequency : 98MHz
Modulation : no modulation
Output level : 0.1V (100dB)
Modulation : no modulation
Output level : 0.1V (100dB)
set
IC1 pin
4
MAIN board
1
µ
F
frequency counter
[AM]
[FM]
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