Narrow-Fm - Sony ICF-PRO70 Service Manual
Pll synthesized receiver
Hide thumbs
Also See for ICF-PRO70:
- Service manual (7 pages) ,
- Service manual (38 pages) ,
- Service manual (35 pages)
Table of Contents
Advertisement
ICF-PRO70/PRO80
ICF-PRO70/PRO80
FM IF Adjustment
Second Local Oscillator Adjustment
Procedure:
AM '1st and 2nd IF Adjustment
Procedure:
NARROW-FM
Detector Adjustment
(Except ICF-PRO70 Type 3 and Type 4)
Procedure:
VTVM
(ACV range)
earphone jack
mal
FM RF SSG
antenna-input terminal
.
;
(Refer to page 16.)
pbb von
Carrier frequency:
93 MHz
Modulation:
400 Hz
C7}
Deviation:
22.5 kHz, 75 kHz
Output level:
usable lowest possible
. Set the frequencies
of the SSG and the receiver to 93
MHz.
. Set the deviation of the SSG to 22.5 kHz.
. Adjust
T3
to obtains
a maximum
signal-output
level
on the VIVM.
. Set the output attenuator of the SSG to 60 dB and the
deviation to 75 kHz.
. Adjust L15 to obtain
a minimum
distortion of the out-
put signal.
Adjustment Location:
signal board — IC side —
1.
Set the receiving frequency of the receiver to 11.8 MHz,
and the detection mode to the AM NARROW
and turn
the FINE switch off.
. Connect
a high-input impedance
frequency
counter
to
the point ®.
. Adjust L19 so that the reading on the frequency counter
becomes in 55.390 MHz +100 Hz.
. Turn the FINE switch on and adjust the FINE control to
both
FINE MIN and FINE MAX
ends.
The frequency
readings at both ends should be +3.5 to +4.5 kHz when
referred to that obtained in the step 3 above.
signal board — grounding-pattern side —
eS
ae
8)
frequency counter
c
Adjustment Location:
signal board
— IC side —
VTVM
AM RF SSG
= 8ringleadantenna
— [ACV
range}
close to the set.
oly
Modulation:
400 Hz, 30%
Output level:
usable lowest possible
earphone jack
. AM Ist IF Adjustment:
a) Set the frequencies
of the SSG and the receiver to
11,800 kHz,
and
set the detection
mode
of the re-
ceiver to the AM NARROW.
b) Adjust T8 and T9 to obtain a maximum output level.
. AM 2nd IF Adjustment:
a) Set the frequencies
of the SSG and the receiver to
11,800 kHz, and set the detection mode
of the re-
ceiver to the AM NARROW.
b) Adjust T10 (455 kHz), T11
(AM detector) and T13
(2nd mixer) to obtain a maximum output signal level.
Adjustment Location:
signal board
— IC side —
Procedure:
distortion
FM RF SSG
meter
Ca
=
Be de
antenna-input terminal
(Refer to page 16.)
Modulation:
400 Hz
Deviation:
3.5 kHz
Output level:
60dB
earphone jack
. Set the frequencies of the SSG and the receiver to 11,800
kHz and the detection mode of the receiver to the FM
NARROW.
. Adjust L20 to obtain a minimum distortion of about 1%
of the output signal.
Adjustment Location:
signal board — IC side —
Advertisement
Table of Contents
