Section 3 Dial Pointer Setting; Section 4 Electrical Adjustments - Sony ICF-18 Service Manual

DIAL POINTER SETTING
Note: Follow the assembly procedure in the numerical order given.
Note: When take off the pointer,
remove to direction of the arrow A .
pointer
A
2 Turn the VC gear
fully in the arrow B
direction.
SECTION 3
1 Slide the pointer
to the inner part.
B
3 Insert the pointer to the gear
fitting the concave position
of the pointer to the convex
position of the gear.
– 3 –
ELECTRICAL ADJUSTMENTS
0dB=1 µV
[FM Section]
Setting:
Band select switch: FM
FM RF SSG
level meter
8 Ω
+
set
–
± 22.5 kHz frequency
earphone jack
deviation by 400 Hz
FM antenna terminal
signal
Output level: as low as possible
[AM Section]
Setting:
Band select switch: AM
Put the lead-wire
antenna close to
AM RF SSG
level meter
the set.
8 Ω
+
set
–
30% amplitude
earphone jack
modulation by
400 Hz signal
Output level: as low as possible
Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally done
by the trimmer capacitors.
Adjustment Location: MAIN board (Component Side)
L1
AM
JW4
TRACKING
CT4
T1
AM IF
L2
FM TRACKING
SECTION 4
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
CT1 109.5 MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
CT2 109.5 MHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
CT3
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
CT4
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
AM FREQUENCY
COVERAGE
FM
antenna
CT3 L4
terminal
CT1
FM FREQUENCY
COVERAGE
L3
IC1
S1
( )
BAND SELECT
CT2
SWITCH
FM ↔ AM ↔ OFF
– 4 –
75.0 MHz
75.0 MHz
520 kHz
1,650 kHz
600 kHz
1,400 kHz
455 kHz