Frequency Adjustment; Section 3 Electrical Adjustment - Sony AN-LP1 Service Manual

FREQUENCY ADJUSTMENT

Connection:
Note: Make this adjustment, if either ANTENNA board or CONTROL
board in this set was replaced or if equivalent work was executed,
because these boards have been adjusted in a pair.
1. Connect AM RF SSG to the TP (DUMMY-IN) and TP (SG
GND) of the ANTENNA board.
AM RF SSG
0.5 pF
output level:
as low as possible
2. Disconnect a loop antenna assy from the ANTENNA board,
and connect a dummy antenna coil (2.2µH (1-410-320-00))
between TP (ANT+) and TP (ANT–) of the ANTENNA board.
3. Connect the ANTENNA MODULE, ANTENNA CONTROL-
LER, RADIO for adjustment (e.g. multi-band radio having ex-
ternal antenna input terminal (ICF-SW7600G)), and level meter
as shown below.
Long cord of
ANTENNA
CONTROLLER CONTROLLER
ANTENNA ANTENNA
MODULE CONTROLLER
J1 and J2
external
antenna jack
Adjustment Procedure:
1. Adjust the receiving frequency of the radio for adjustment (ICF-
SW7600G) to the AM RF SSG frequency (refer to the follow-
ing table).
2. Adjust respective adjusting elements on the CONTROL board
so that the level meter reading becomes maximum when the
frequency of AM RF SSG and the FREQ SELECT switch are
set as listed below.
AM RF SSG FREQ. SELECT
frequency switch position
3.950 MHz
4.900 MHz
6.075 MHz
7.250 MHz
9.700 MHz
11.825 MHz
13.700 MHz
16.500 MHz
20.400 MHz
SECTION 3
ELECTRICAL ADJUSTMENT
ANTENNA board
TP(DUMMY-IN)
TP(SG GND)
Short cord of
ANTENNA
level meter
+
–
RADIO of
adjustment
(ICF-SW7600G)
headphone
jack
Adjusting
elements
4 RV101
5 RV102
6 RV103
7 RV104
10 RV105
12 RV106
14 RV107
16 RV108
20 RV109
Adjustment and Connection Location:
[ANTENNA BOARD] (Conductor Side)
TP
(ANT+)
[CONTROL BOARD] (Conductor Side)
RV104
RV105
– 6 –
J1 J2
TP
TP
(SG GND)
(ANT–)
TP
(DUMMY-IN)
RV103
RV106
S101
FREQ SELECT
SWITCH