Sony SRF-M37 - Section 3 Adjustments

5
SRF-M37
SECTION 3
ADJUSTMENTS
Setting:
BAND switch: AM
Connection:
For AM frequency coverage adjustment and FM frequency coverage check.
AM Section
digital
voltmeter
TP10 (VT
)
Connection:
AM RF signal
generator
30% amplitude modulation by
400 Hz signal.
Output level: as low as possible
Put the lead-wire
antenna close to
the set.
level mete
r
set
headphone jack (
i )
16
Ω
+
–
FM Section
FM RF signal
generator
22.5 kHz frequency deviation
by 400 Hz signal.
Output level: as low as possible
0.01 µ F
TP12 (ANT)
Setting:
BAND switch: FM
FM SENS switch: DX
Connection:
Adjustment Location
TP10
(VT)
TP12
(ANT)
MAIN BOARD
MAIN BOARD
IC2
IC1
(Conductor side)
CT2
L3
AM TRACKING
Adjustment
L4
AM FREQUENCY
COVERAGE Adjustment
(Component side)
CT1
L1
FM TRACKING
Adjustment
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a reading on digital voltmeter.
L4 530 kHz 1.3V ± 0.1V
Confirm 1,710 kHz 8.1V ± 0.3V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
CT2 1480 kHz
L3 590 kHz
FM FREQUENCY COVERAGE CHECK
Check a reading on digital voltmeter.
Confirm 87.5 MHz 6.9V ± 0.3V
Confirm 108.0 MHz 12.1V ± 0.3V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
CT1 108.0 MHz
L1 87.5 MHz