Read Sony SRF-HM03V Service Manual online
7
SRF-HM03V
SECTION 3
ELECTRICAL ADJUSTMENTS
AM VCO VOLTAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L4
530 kHz
1.30
±
0.05 V
Confirmation
1710 kHz
8.10
±
1.00 V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L3
590 kHz
CT3
1490 kHz
FM/TV (2-6CH) VCO VOLTAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
Confirmation
TV 2ch (59.75 MHz)
1.95
±
0.50 V
Confirmation
108.0 MHz
11.80
±
1.00 V
FM/TV (2-6CH) TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L2
TV 2ch (59.75 MHz)
CT2
108.0 MHz
TV (7-13CH)/WEATHER VCO VOLTAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
Confirmation
WEATHER 2ch
3.10
±
0.50 V
(162.4 MHz)
Confirmation
TV 13ch
8.10
±
1.00 V
(215.75 MHz)
TV (7-13CH)/WEATHER TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
CT1
TV 10ch (197.75 MHz)
0 dB=1
µ
V
[AM]
Setting:
BAND: AM
BAND: AM
[FM/TV/WEATHER]
Setting:
BAND: FM/TV/WEATHER
BAND: FM/TV/WEATHER
• Repeat the procedures in each adjustment several times for a
maximum reading on level meter, and each tracking adjustments
should be finally done by the trimmer capacitors.
should be finally done by the trimmer capacitors.
• Remove FM/TV/WEATHER lead-wire antenna in FM/TV/
WEATHER adjsutments.
Adjustment Location:
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
modulation by
400 Hz signal
Output level: as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
+
–
–
level meter
set
16
Ω
headphone
FM RF signal
generator
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
deviation by 400 Hz
signal
Output level: as low as possible
+
–
–
level meter
headphone
set
16
Ω
0.01
µ
F
TP (ANT)
+
–
–
digital voltmeter
MAIN board
TP (VT)
TP (GND)
– MAIN BOARD (Conductor Side) –
TP
(ANT)
TP
(GND)
TP
(VT)
IC101
CT1
TV (7-13CH)/WEATHER
Tracking Adjustment
TV (7-13CH)/WEATHER
Tracking Adjustment
L4
AM VCO Voltage Adjustment
AM VCO Voltage Adjustment
L3
CT3
CT3
AM Tracking Adjustment
L2
CT2
CT2
FM/TV (2-6CH) Tracking Adjustment
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