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POWER TRANSFORMER
U. S.
&
Canadian models:
GA67130
European model:
GA67 140
General model:
GA67 120
Australian model :
GA67150
TUNER CIRCUIT BOARD
AM LOOP ANTENNA
FRONT END Cl RCUIT BOARD
POWER SWITCH (SW203)
IC114 : LC6502C-638
IC113:LC7210
KEYBOARD UNIT CIRCUIT BOARD
LED FREQUENCY & SIGNAL INDICATOR
1. Before Adjustment
1) Start adjustment approximately 5 minutes after the
power switch is pushed on in order t o stabilize the
operation of circuit.
2)
Adjust the OSC coil and I FT using high-frequency or
nonferrous screwdriver.
3) Adjust the FM section first. After that, adjust the AM
section.
4) Set the switches t o the following positions unless
otherwise specified.
TUNING MODE.
. . . . . . . . . . . . . . . . .
AUTO
RECCAL
. . . . . . . . . . . . . . . . . . . . . .
OFF
5) Be sure t o make adjustment after installing the
bottom cover.
6) For connection with OUT PUT, use HIGH terminal.
<
Line Voltage Checkup
>
Check to see if the specified voltage i s provided across
each terminal and E in the tuner circuit board.
2. Measuring Instruments Abbreviation
FM SG
. . . . . . . . . . . . . . .
FM signal generator
SSG
. . . . . . . . . . . . . . . . .
Stereo signal generator
AM SG
. . . . . . . . . . . . . . .
AM signal generator
OSC
. . . . . . . . . . . . . . . . .
Oscilloscope
DlST M
. . . . . . . . . . . . . .
Distortion meter
FC
. . . . . . . . . . . . . . . . . .
Frequency counter
ACVM
. . . . . . . . . . . . . . .
AC voltmeter
Center meter
. . . . . . . . . . .
Ji00036 or equivalent
DCVM
. . . . . . . . . . . . . . .
DC voltmeter
<
FM Tuner Section
>
@
Use
19kHz
L.P.F for OUTPUT L and R terminals and
make auditory compensation. Then connect the os-
cilloscope, AC voltmeter and distortion meter.
@
To check the optimum tuning point during adjust-
ment, connect the auxiliary center meter (Ji00036 or
equivalent, current sensitivity: 250pA) as shown in
the figure.
@
The accuracy of FM SG should be within
+l
kHz.
N
Vcc
T.M
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