SRF-M95 - Sony Audio Service Manual (repair manual). Page 4

Read Sony SRF-M95 Service Manual online

4
SRF-M95
SECTION  3
ADJUSTMENTS

Setting:
BAND switch: AM
Connection:
For AM frequency coverage adjustment and FM frequency coverage check.
AM Section
digital
voltmeter
TP (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 meter
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
TP (ANT)
FM VCO Adjustment
Setting:
BAND switch:
FM
FM SENS switch: DX
Procedure:
1.
Turn off the FM RF signal generator.
2.
Put a capacitor (100 
µF) between pin ws (IC201) and GND.
3.
Put a resistor (100 k
Ω) between TP (VCO) and GND.
4.
Tune the set to 87.5 MHz.
5.
Adjust RV201 for 19 kHz 
± 0.05kHz reading on the frequency
counter.
AM FREQUENCY  COVERAGE  ADJUSTMENT
Adjust for a reading on digital voltmeter.
 T201
531 kHz (530 kHz) [531 kHz]
1.3V 
± 0.1V
  Confirm
1,602 kHz (1,710 kHz) [1,710 kHz]
10 V or less
AM  TRACKING  ADJUSTMENT
Adjust for a maximum reading on level meter.
CT201
1485 kHZ (1480 kHz)
L201
585 kHz (590 kHz)
FM FREQUENCY  COVERAGE  CHECK
Check a reading on digital voltmeter.
  Confirm
87.5 MHz [76.0 MHz]
3.5V [0.9 V] or more
  Confirm
108.0 MHz
11V or less
FM TRACKING  ADJUSTMENT
Adjust for a maximum reading on level meter.
CT101, CT102
108.0 MHZ
L104
87.5 MHz [76.0 MHz]
(     ) : Panama model   [     ] : Tourist model
Connection:
frequency counter
TP (VCO)

Setting:
BAND switch:
FM
FM SENS switch: DX
Connection:
Adjustment Location
[MAIN BOARD]
(SIDE B)
[MAIN BOARD]
(SIDE A)
IC401
CN401
IC201
GND
TP(VCO)
GND
GND
TP(ANT)
TP(VT)
TP(pin 
ws
)
IC101
CT101
CT102
CT201
L201
L104
FM TRACKING
Adjustment
AM TRACKING
Adjustment
T201
AM FREQUENCY 
COVERAGE Adjustment
RV201
FM VCO
Adjustment
Display
Click on the first or last page to see other SRF-M95 service manuals if exist.
Random: