Sharp GF-320A Service Manual
SHARI=
SERVICE
MANUAL
S2627G
F320ABK
G F=320A( B
K)
G F=320A(
R)
G F=320A(
P)
G F-320A(Y)
G F-320A( B
L)
PHOTO:
GF-320A(BK)
in the interests of user-safety the set should be restored to its
original condition and only parts identical to those specified be
used.
/
INDEX
TO CONTENTS
SPECIFICATIONS . . . . . . . . .
STRINGING OF DIAL CORD . . . .
NAMES OF PARTS . . . . . . . , . . .
DISASSEMBLY . . . . . . . . . . . . . .
BLOCK DIAGRAM . . . . . . . . .
CIRCUIT ADJUSTMENT . . . . . . . .
MECHANICAL ADJUSTMENT . . . .
EXPLODED VIEW . . . . . . . . .
SCHEMATIC DIAGRAM . . . . . .
WIRING SIDE OF
P.W.BOARD
. . . .
NOTES ON SCHEMATIC DIAGRAM
TYPES OF TRANSISTOR AND LED
REPLACEMENT PARTS LIST . . . . .
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3
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5
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6-8
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9,
IO
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II,12
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13,14
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15
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16-19
SHARP CORPORATION
L
PLEASE REFER TO THE OPERATION MANUAL
GENERAL
Power source:
Output power:
(nput
impedance:
Loaded impedance:
Dimensions:
Weight:
SPECIFICATIONS
AC 240 V, 50 Hz
DC 9 V
(UM/SUM-1
or R20 x 6)
PMPO; 20W (low +
low)
(AC operation)
MPO;
8W
(4W +
4W)
(AC operation)
RMS;
3.8W (1.9W + 1.9W)
(DC operation, 10% distortion)
External mic; 600 ohms
Headphones; 8-25 ohms
External speakers; 4-8 ohms
Width; 494 mm
(19-l/2”)
Height; 180 mm
(7-l/8”)
Depth; 130 mm
(5-l/8”)
2.8 kg (6.2
Ibs.)
without
RADIO
Frequency range:
TAPE RECORDER
Tape:
Frequency response
:
Signal/noise ratio:
Wow and flutter:
SPEAKER
Speakers:
Impedance:
Maximum power
handling capacity:
I
FM; 87.6 - 108 MHz
AM; 526.5 -
1,606.5 kHz
Compact cassette tape
100 Hz - 10,000 Hz
36 dB
0.2% (WRMS)
10 cm
(4”)
woofer x 2
Horn type tweeter x 2
4 ohms
5 W (maximum)
batteries
Specifications for this model are subject to change without
prior notice.
STRINGING OF DIAL
CORD
Dial
Cord Assembly
(201)
1. Wind the dial cord over the tuning control and attach the
tuning control to the front cabinet.
2. Set the dial cord over the boss (A).
3. Set the dial cord over the bosses (B) and
(C).
(A)
Tuning control shaft (Knob)
(215)
Dial
Poind
&kg
Point
/
(209)
Figure 2-
1
-2-
NAMES OF
PARTS
1.
Cassette Compartment
2. Headphone Jack
3. Volume Control
4. Balance Control
5.
Power Indicator
6. FM Stereo indicator
7. Tuning Control
8. Function Selector Switch
9. Record Button
10.
Play Button
11. Rewind Button
12. Fast Forward Button
13. Stop/Eject Button
14. Pause Button
15. Graphic Equalizer Control
16. Speaker Cord Holder
17. Speaker Release Lever
18. External Microphone Jack
19. External Speaker Terminals
20. Telescopic Rod Antenna
2 1.Battery Compartment
22.
AC Power Supply Socket
1
234
56
7 8
7
18
19
20
21 22
17 16
Figure 3- 1
Figure 3-2
-3-
DISASSEMBLY
Caution on Disassembly
Follow the
below-mentioned
notes
when
disassembling
the
unit
and reassembling it, to keep its safety and excellent
performance:
1. Take
cassette
out of
the
unit.
2.
Be sure to remove
the power
supply
plug from the wall
outlet before starting to disassemble the unit and remove
the batteries from the unit.
3. Take off nylon bands or wire holders where they need
be
removed
when
disassembling
the
unit.
After
servic-
ing the unit,
be sure to rearrange
the
leads
where they
were
before disassembling.
4. Take sufficient care on static electricity of integrated circuits and other circuits when servicing.
STEP
REMOVAL
PROCEDURE
FIGURE
Main
body section
I
Front Cabinet
1. Battery comparment
lid
..............................
(Atxl
2. Open the cassette
holder
............................
(B)
3. Screw
........................
(C)x5
-
4-l
Mechanism Block
1. Screw
........................
(01x2
2. Socket..
......................
tE)x2
3. Tip
.............................
(F)x2
Main P.W.Board
;. ~,“~o~d;,,,,a,k.~,l,,tbr(G)xl
sprmg.........................
(Hlxl
4-2
-
4-3
Speaker section
/
I
I
1
Front Cabinet
/1.
Screw . . . . . . . . . . . . . . . . . . . . . . . . .
(11x5
4-4
Note:
Set the mechanism in such a way as that the record/playback
selector lever is
positioned as
shown in
Fig.
4-2.
Front Cabinet
Figure 4- 1
Figure 4-4
Record/Playback Selector Lever
\/-----I
$3
x
8mm
Figure 4-2
Figure 4-3
Switch
:/PB Head
(I)
@3 x 25mm
-4-
SWIOI-A-F
FUNCTION SELECTOR SWITCH
SWIOZ-A-J
RECORD/PLAYBACK SWITCH
Figure 5 BLOCK DIAGRAM
-5-
CIRCU
IT ADJUSTMENT
(TUNER SECTION
AM
IF/RF
ADJUSTMENT
Ckcilloscope
Test AM
-
.
SWITCH
POSITION
AM
SIGNAL
400
Hz, 30%. AM modulated
GENERATOR
TEST
FRE- DIAL
AD-
STEP STAGE
QUENCY POINTER
JUST-
REMARKS
SETTING MENT
1
IF
455 kHz
High
T3
Adjust for
frequency best “IF”
cu we.
2
510
kliz
Lowest L8
Band
frequency
Adjust for
-
coverage
maximal
3
1,650
Highest
TC8 output.
kHz frequency
Repeat steps 2 and 3 until no further improvement can
Figure 6- 1 AM IF
455
kHz
A
Figure 6- 2 AM IF CURVE
Signal
Generator
Test
Loop
Bar Antenna
Figure 6-3 AM RF
Figure 6- 4 ADJUSTMENT POINTS
-6-
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