Sony ICF-7600DA - Page 24

SECTION 3
DIAGRAMS
AM AGC ADJUSTMENT DC-DC CONVERTER CHECK
NOTE:
This
adjustment
is
needed
only
for
the
set
Setup:
3-1.
SEMICONDUCTORS
LEAD
LAYOUTS
bearing
these
serial numbers
7902
and
up.
MAIN
POWER
switch:
ON
The
adjustment
control
RV2
is
not
POWER
switch:
ON
equipped
in
these
sets
bearing
the serial
numbers
up
to
7901.
Procedure
Setup:
Band: SW1
188123 TC74HC138F 28K238-K16
MC74HCS595F
16 9
1 &
main
board
2SK508-K51
-
me
2SK94
digital
voltmeter
:
a
(DC
V
range)
:
1SS279 CXA1031M 2S$K209
Short antenna input
and ground.
eS |
Set |
(record jack)
rd $s
(ror view) 28C2223
182837 DTA124EK
DTC124EK
LA5003M 28C2712
2SD596
28C1623
2SB624
2SC3052
cathode
frequency counter
main board
(conductor side)
S-81230AG-RB
in
on the LPF
t frequency
LPF line.
NDS
ono i out
RD16M-B
#PC358G2
=a
8765
7,465k
Hz
1,960 kHz Procedure:
Adjust RV2 to obtain a 1.275 V (40.003 V) on the
5.5V digital voltmeter.
t234
(Top view)
SLP1 78B (Marking side view)
Adjustment Location: — main board (component side) —
Specification:
RVv2 frequency: 1,750 kHz to 1,900 kHz
.
CIboeaakaeaaae
1°
DC
voltage:
16.5
V
to
17.5
V
[o] [O)
OX)
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9)
MC74HCOOF
TC74HC74F
(TOP VIEW)
— main board (component side}
eet tet fo} O