Sony CFD-Z125 - Cd Radio Cassette-corder, Руководство по обслуживанию

Страница: 18 / 42

— 18 —
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
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.
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
AM RF SSG
0.01
µ
F
FM RF SSG
FM telescopic
antenna terminal
75kHz frequency deviation
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
counter.
Adjustment Locastion: MAIN board (See page 19.)
0.01
µ
F
FM RF SSG
FM telescopic
antenna terminal
Carrier frequency : 98MHz
Modulation : no modulation
Output level : 0.1V (100dB)
set
IC1 pin
4
MAIN board
1
µ
F
frequency counter
[AM]
[FM]