Sony WM-FX50 - Page 27

Power Supply Voltage Adjustment
Function switch : RADIO FM ST
Band switch : FM
VTVM
[|
TP
(REG OUT 1.1V) ea
Reading on VTVM
Adjustment part
1.1 + 0.01V
Tuning Voltage Adjustment
Function switch : RADIO FM ST
Band switch : FM
VTVM
zs
TP :
(TUNING VOLTAGE) Le
ye
* Repeat the procedure in each adjustment several
times since RV (f min) affects RV (f max) and RV
(f max) affects RV (f min). This adjustment should
end with the final adjustement of RV (f max).
)
position part VTVM
Note :
RV (f min), RV (f max) is built-in the RV51 block.
FM VCO Adjustment
f minimum
f maximum
FM rf signal
generator (SG)
= pega eee I
Carrier frequency : 98MHz Le
1 kHz, 30% FM modulation
frequency deviation +22.5kHz
Output level : 562uV (55dB)
Function switch : RADIO FM ST
Band switch : FM
FM antenna terminal
Frequency
counter
=
ity — 8 |
¢ Tune the set to 98 MHz.
Adjustment frequency
part counter
L5 38kHz+0.02kHz
FM 2nd OSC Adjustment
Function switch : RADIO FM ST
Band Switch: FM
Adjustment part : L6
*How to adjust FM 2nd. oscillator useing the
' spectrum analyzer.
—
. Prepared the spectrum analyzer and RF amplifier
_ as shown in below drawing.
2. Set the switch to radio FM stereo position of WM-
FX50.
3. Put the RF amplifeir block which connected to
spectrum analyzer to just beside and one centi-
meter away from L6.
4. Adjust L6 to bring up maximum waveform at. 57.5
MHz position in spectrum analyzer.
Spectrum
Analyzer
a RF AMP
=
a
a
| lcm |
* How to adjust FM 2nd. oscillator if the spectrum
analyzer is not available.
—
. Prepared built-in SSB digital tuning radio such as
SONY ICF-2001 or equivalents.
2. Tuned 57.5MHz + 0.1MHz at the SSB mode of
built-in SSB digital tuning radio.
3. Set the switch to radio FM stereo position of WM-
FX50.
4, Put the telescopic antenna of built-in SSB digital
tuning radio to just beside and one centi-meter
away from L6 as show in below drawing.
5. Digital tuning radio will be reproduce peep sound.
6. Adjust L6 to fade out or minimize peep sound.
Digital tuning
radio
| om Telescopic
lcm Antenna