Tuner Section - Sony PMC-D305 Service Manual

TUNER SECTION

Precautions in Repairing
Note: As a FM front-end (TU1) is difficult to repair if faulty, replace it
with new one.
[AM]
FUNCTION Switch: RADIO
BAND Switch: AM, MW, LW
AM RF SSG
30% amplitude modulation by
400 Hz signal
output level: as low as possible
[FM]
FUNCTION Switch: RADIO
BAND Switch: FM
FM RF SSG
22.5 kHz frequency deviation
by 400 Hz signal.
output level: as low as possible
level meter
32 Ω
set
PHONES jack
digital voltmeter
TP (VT)
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
• Abbreviation
D305: PMC-D305
D305L: PMC-D305L
Put the lead-wire
antenna close to
the set.
0.01 µ F
to ANT IN terminal
+
–
+
–
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
CFT1
(D305)
AM FREQUENCY COVERAGE CONFIRM
Confirm for a reading on digital voltmeter.
Confirm 530 kHz <531 kHz>
Confirm 1,710 kHz <1611 kHz>
Note: Not use the AM RF signal generator in this confirm.
< >: Australian model
(D305)
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
CT2
(D305L)
MW FREQUENCY COVERAGE CONFIRM
Confirm for a reading on digital voltmeter.
Confirm 531 kHz
Confirm 1611 kHz
Note: Not use the AM RF signal generator in this confirm.
(D305L)
MW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
CT4
(D305L)
LW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a reading on digital voltmeter.
Confirm 153 kHz
L4 279 kHz
Note: Not use the AM RF signal generator in this adjustment.
(D305L)
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L5
CT5
(D305)
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a reading on digital voltmeter.
L2 87.5 MHz
Confirm 108 MHz
Note: Not use the FM RF signal generator in this adjustment.
(D305)
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
CT1
Adjustment Location: TUNER board (See page 29.)
– 28 –
450 kHz
1.0 ±0.5 V
5.0 ± 1.0 V <4.8 ± 1.0 V>
620 kHz
1,400 kHz
0.85 ± 0.5 V
6.8 ± 1.5 V
621 kHz
1,404 kHz
0.7 ± 0.5 V
7.5 ± 0.2 V
162 kHz
261 kHz
1.6 ± 0.4 V
6.5 ± 0.5 V
87.5 MHz
108 MHz