Sony ICF-SW07 Service Manual page 30

SW FREQUENCY Adjustment
BAND : AM
VOLUME control : as required
Connection Points :
AM RF SSG
30% amplitude modulation
by 400Hz signal.
Output level :
as low as possible
[ANTENNA BOARD]
(Side B)
Two dummy antenna coils 1 µ H (1-410-497-11)
Disconnect a loop antenna ASSY from the antenna board,
Note :
and connect two dummy antenna coils in series connection.
ANTENNA
MDULE ANTENNA
(ANTENNA CONTROLLER
BOARD)
J1,J2
(AM EXT ANT)
0.5pF
TP
(DUMMY IN)
TP
(SG GND)
level meter
16 Ω
SET
(MAIN
BOARD)
J302
J101
(headphone)
Procedure :
1. Align the set with the frequency of the AM RF signal generator
shown on the table below.
2. Align RV401 - RV412 for each band meter band until the high-
est reading is obtained on the level meter.
AM RF SSG frequency
2.4MHz
3.3MHz
3.95MHz
4.9MHz
6.075MHz
7.25MHz
9.7MHz
11.825MHz
13.7MHz
15.35MHz
18.275MHz
23.5MHz
Always perform the SW Frequency Adjustment after hav-
Caution :
ing replace the main circuit board or antenna circuit board.
Adjustments Location : MAIN board (see page 33)
– 30 –
Meter band Adjust part
120mb RV401
90mb RV403
75mb RV405
60mb RV407
49mb RV409
41mb RV411
31mb RV402
25mb RV404
22mb RV406
19mb RV408
16mb RV410
13mb RV412