– 11 –
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T2
455kHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
520kHz
CT4
1,780kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
620kHz
CT3
1,400kHz
FM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
10.7MHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
86.5MHz
CT2
109.5MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
86.5MHz
CT1
109.5MHz
Adjustment Location
: Main board (See page 13)
VCO Adjustment
Procedure :
1. Connect the frequency counter to
4
and
7
pin of IC 1 as
shown the figure below.
2. Turn the set to 98MHz.
3. Adjust RV1 for 76,000Hz reading frequency counter.
Standard Value : 75,950 – 76,050Hz
[ MAIN BOARD]
(Conductor side)
Adjustment Location
: Main board (See page 13)
FM RF signal
generator
Carrier frequency : 98MHz
Modulation : No modulation
Output level : 1.38mV (–55dB)
set
telescopic
antenna
terminal
0.01
µ
F
JW2
C
2
JW319
JW316
FB1
JW320
JW317
Q310
JW3
C1
R7
VCO
VCO
CF1
C22
C21
CF2
C15
L2
C6
C14
R5
R8
C2
C3
C
3
C13
C
1
T2
C9
JW1
IC1
R2
C121
C19
C1
T1
R6
JW
C18
JW318
R3
JW321
JW
JW71
2
JW323
1
5
10
15
16
20
25
30
B
C
E
[MAIN BOARD]
(Conductor side)
frequency counter
33k
Ω
1
µ
F