Sony PMC-MD55 Service Manual page 128

TUNER SECTION
[AM (MW/LW)]
Setting:
Function : RADIO
BAND switch: AM (MW/LW)
Put the lead-wire
AM RF signal
antenna close to
generator the set.
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
[FM] (US, Canadian)
* The adjustment is not necessary for FM because
that AEP, UK models use FM tuner unit (TU1).
Setting:
Function : RADIO
BAND switch : FM
MONO/ST switch: stereo
FM RF signal
generator
0.01 µ F
75 kHz frequency
deviation by 1 kHz
signal
Output level: as low as possible
TU board
100 k Ω
TP (CV)
TP (FM–)
• Repeat the procedures in each adjustment several times, and the
VT voltage and tracking adjustments should be finally done by
the trimmer capacitors.
SECTION 5
ELECTRICAL ADJUSTMENTS
0 dB=1 µV
level meter
32 Ω
+
set
–
2 (headphone) jack
TU board
level meter
TP (FM+)
32 Ω
+
set
–
2 (headphone) jack
TU board
TP (FM–)
digital voltmeter
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1
AM VT VOLTAGE CONFIRMATION (US, Canadian)
Frequency Display
Confirmation
Confirmation
AM TRACKING ADJUSTMENT (US, Canadian)
Adjust for a maximum reading on level meter
L4
CT2
MW VT VOLTAGE ADJUSTMENT (AEP, UK)
Adjustment Part Frequency Display Reading on Digital Voltmeter
L4
CT4
LW VT VOLTAGE ADJUSTMENT (AEP, UK)
Adjustment Part Frequency Display Reading on Digital Voltmeter
CT5
Confirmation
MW TRACKING ADJUSTMENT (AEP, UK)
Adjust for a maximum reading on level meter
L3
CT2
LW TRACKING ADJUSTMENT (AEP, UK)
Adjust for a maximum reading on level meter
L5
CT3
FM VT VOLTAGE ADJUSTMENT (US, Canadian)
Adjustment Part Frequency Display Reading on Digital Voltmeter
L2
Confirmation
FM TRACKING ADJUSTMENT (US, Canadian)
Adjust for a maximum reading on level meter
L1
CT1
Adjustment Location: TU board (See page 20)
– 19 –
450 kHz
Reading on Digital Voltmeter
+ 0.8
530 kHz 0.7
– 0.3
1,710 kHz 5 ± 1 V
620 kHz
1,400 kHz
531 kHz 0.8 ± 0.1 V
1,611 kHz 5.5 ± 0.2 V
+ 0.3
279 kHz 5.5
– 0.4
+ 0.4
153 kHz 0.5
– 0.3
621 kHz
1,404 kHz
162 kHz
261 kHz
108 MHz 4.2 ± 0.2 V
+ 0.2
87.5 MHz 1.9
– 0.4
87.5 MHz
108 MHz
V
V
V
V