Electrical Adjustments - Sony SRF-HM01V Service Manual

0 dB=1 µV
[AM]
Setting:
BAND: AM
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/TV]
Setting:
BAND: FM, TV or WEATHER
FM RF signal
generator
TP (ANT)
0.01 µF
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
MAIN board
TP (VT)
TP (GND)
• Repeat the procedures in each adjustment several times for a
maximum reading on level meter.
• Remove FM wire antenna in FM adjsutments.
Adjustment Location:
– MAIN Board (Conductor Side) –
TP
TP
(ANT)
(GND)
CT1
TV Tracking
Adjustment
L2
CT2
SECTION 3

ELECTRICAL ADJUSTMENTS

level meter
16 Ω
+
set
–
headphone
level meter
16 Ω
+
set
–
headphone
digital voltmeter
+
–
IC201
TP
(VT)
FM Tracking Adjustment
AM VCO VOLTAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
L4
Confirmation
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L3
CT3
FM VCO VOLTAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
Confirmation TV 2ch (59.75 MHz)
Confirmation
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L2
CT2
TV VCO VOLTAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
Confirmation
Confirmation
TV TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
CT1
L4
AM VCO Voltage Adjustment
L3
AM Tracking Adjustment
CT3
SRF-HM01V
1.30 ± 0.05 V
530 kHz
8.10 ± 1.00 V
1710 kHz
590 kHz
1490 kHz
1.91 ± 0.50 V
11.70 ± 1.00 V
108.0 MHz
TV 2ch (59.75 MHz)
108.0 MHz
WEATHER 2ch
3.00 ± 0.50 V
(162.4 MHz)
TV 13ch
8.10 ± 1.00 V
(215.75 MHz)
TV 10ch (197.75 MHz)
7