Sony ICF-2001D - IF Alignment and Tracking Adjustments; VC01 Frequency and Tracking (AM); AM 1 st I-F Alignment

ICF-2001D/2010
VCO1 FREQUENCY AND TRACKING
AM 1st I-F ALIGNMENT
ADJUSTMENTS Setup:
Bonne: Band: AM
Band:
AM
oscilloscope
Mode:
WIDE
Mode:
any
Frequency:
any
Frequency:
1,450
kHz
ba
ot
OU
TpAE
ay
AM
RF
GAIN
control:
MAX
frequency counter
shield plate (N)
Procedure:
1, Adjust CT5 for a 88.000 MHz or 88.000 MHz
+ 300 kHz counter reading.
2. With the adjustment jumper wire connected as is,
adjust CT6 for a maximum output level.
3. Unsolder the ground side of the jumper wire set
up
for
adjustments.
Connect
this
end
to
B+
3V
5.
land, Frequency reading should now be between
50 MHz and 55 MHz.
4. Unsolder the B+ side of the adjustment jumper
wire and connect this end to the ground again.
5. Adjust T3 for a maximum output level.
6. Repeat steps 3 through 5 several times until no
further improvement is obtained.
7. After the adjustment, remove the adjustment
jumper wire and properly install shield plate (N).
Adjustment Location:
— main board —-
4.
VOLUME control: as required
AM rf signal
generator ;
AZ Put the lead-wire
antenna close to
the set.
€
vom
30% amplitude (range: 0.5—5V ac)
modulation by
400 Hz signal
earphone
Procedure:
ie
2.
3:
Tune in the set to the AM RF SSG frequency.
Adjust LS for a maximum output level.
Adjust IFT Al and L6 alternately for a maximum
and synmetrical output level.
Final response should be as illustrated below.
L5 (center peak)
This response can be checked by detuning the set
to upper and lower sides of the center frequency
in same amount, or by changing SSG frequency |
with set’s frequency unchanged.
Repeat above steps several times until no further
improvement is obtained.
Adjustment Location
— main board —