– 29 –
SECTION 4
ELECTRICAL ADJUSTMENTS
AM SECTION
0dB=1
µ
V
2nd LOCAL Adjustment
BAND : AM
VOLUME control : as required
Connection Points :
Procedure :
1. Tune the set to AM 150kHz.
2. Press the SSB button, and confirm that USB is displayed.
3. Press the
/
1
button.
4. Adjust CT201 to obtain a 55.39MHz on the frequency counter.
Standard value : 55.38997 – 55.39003 MHz
5. Press the
?
button only once. (Return to 2 if wrong)
6. Adjust RV203 to obtain a 55.3891MHz on the frequency counter.
Standard value : 55.38907 – 55.38913 MHz
Adjustments Location : MAIN board (see page 33)
1 st IF Adjustment
BAND : AM
VOLUME control : as required
Setup :
Procedure :
1. Set the frequencies of the AM RF SSG and the frequency dis-
play of the set to 150kHz.
2. Adjust T104 and T105 to obtain a maximum reading on the level
meter.
Adjustments Location : MAIN board (see page 33)
SSB ZERO BEAT Adjustment
Setup :
BAND : AM
MODE : SSB (USB or LSB/CW)
Procedure :
1. Tune to the strong and stable AM station nearby.
2. Adjust the RV201 to attain zero beat (no beat sound heard).
3. Change the mode to the alternative band ( LSB/CW if USB),
and if not, readjust.
Adjustments Location : MAIN board (see page 33)
AM RF SSG
J302(headphone)
level meter
16
Ω
set
Put the lead-wire
antenna close to
the set.
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
DC5V
S
0.01uF
2.4k
Ω
1M
Ω
1pF
servicing tool
2SK193-E
TP (2ND LOCAL)
frequency
counter
Use a shield
wire as short
as Possible
[ MAIN BOARD] (Side A)
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
