Sony ICF-C733 - Page 6

SECTION 3
ELECTRICAL ADJUSTMENTS
* MW/LW Section
Setting :
BAND switch : MW or LW
AM PF signa!
generator
Put the lead-wire
oe antenna close to
VA the set.
30% amplitude modulation
by 400 Hz signal
output level : as low as possible
* FM Section
Setting :
BAND switch : FM
FM PF signal
generator
0.01pF
C—> set
+ 22.5kHz frequency {
deviation by 400 Hz signal lead antenna
output level : as low as possible —_ terminal
VTVM
(range : 0.5 — 5V ac)
speaker terminal
¢ Repeat the procedures in each adjustment several times, and the
VCO voltage and the tracking adjustments should be finally
done by the trimmer capacitors.
AM IF ADJUSTMENT
Adjust for a maximum reading on VTVM.
Tl
450kHz
AM (MW) VCO VOLTAGE ADJUSTMENT
; Reading on Digital
Adjustment
Part
Frequency
Display
voltmeter
531kHz 2.85 +0.1V
1,602kHz less than 11V
Note :Not use the AM RF signal generator in this adjustment.
AM (LM) VCO VOLTAGE ADJUSTMENT
Reading on Digital
Adjustment
Part
Frequency
Display
See
153kHz 2.2£0.1V
281kHz less than 10V
Note :Not use the AM RF signal generator in this adjustment.
FM VCO VOLTAGE CHECK
Reading on Digital
87.5MHz
108MHz check 10.5 + 1.0V
Note :Not use the FM RF signal generator in this adjustment.
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on VTVM.
crs
87.5MHz 108MHz
Adjustment Location : MAIN board (Component Side)
Li CT1 CT4
AM TRACKING AM TRACKING AM VCO VOLTAGE
ADJUSTMENT ADJUSTMENT ADJUSTMENT
L4 =
FM TRACKING —" & ©
ADJUSTMENT
CT3
FM TRACKING
ADJUSTMENT 1
AM IF AM VCO VOLTAGE
digital
voltmeter
LPF OUT
(VCO VOLTAGE)
* mark is mounted on conductor side.