Sharp JG545X(GY),JG545X Service Manual
SHARP
SERVICE
MANUAL
S9381 JC545XGY
JG545X(GY)
l
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
Page
SPECIFICATIONS..
..
.............................................................................................................
2
NAMES OF
PARTS
...........................
....................................................................................
2
DISASSEMBLY..
..................
..................................................................................................
3
REMOVING AND REINSTALLING THE MAIN PARTS..
.......................................................
4
ADJUSTMENT
.......................................................................................................................
5
NOTES ON SCHEMATIC DIAGRAM
....................................................................................
6
TYPES OF TRANSISTOR AND
LED
......................
...............................................................
6
FITING
OF DIAL POINTER
...............................
.....................................................................
6
EXPLODED
VIEW
.........................................
....................................................................
7, a
SCHEMATIC
DIAGRAM
/WIRING
SIDE OF
P.W.BOARD
.............................................
9-12
REPLACEMENT
PARTS
LIST
.......................................................................................
13-15
SHARP CORPORATION
FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER
TO THE OPERATION MANUAL.
SPECIFICATIONS
General
Tape deck
Power source:
Output power:
DC 3 V[“AA” size
(UM/SUM-3, R6
or
HP-7) battery x 2 or external DC 3 V]
Max;20mW(10mW+10mW)
(DC operation)
Dimension:
Weight:
RMS; 10 mW (5 mW + 5mW)
(DC operation, 10 % T
.H.D)
Width; 61 mm
(3-3116”)
Height; 117 mm
(4-9/l
6”)
Depth; 29.9 mm (1
-l/8”)
185 g
(6.5 oz.) without batteries
Frequency response:
40 - 15,000 Hz
(MetaKrOJNormal
tape)
Radio
Frequency range:
FM
; aa -
108
MHZ
AM; 526.5 -
1,606.5 kHz
Headphones
Type:
Impedance:
Inner-ear dynamic
24 ohms
Specifications for this model are subject to change without
prior notice.
NAMES OF PARTS
1. Power/Battery Indicator
2. Extra Bass Switch: X-BASS
3. Volume Control
4. FunctionTape Selector switch
5.
Headphones Socket
6.
Tape Direction Switch: 41,
7. Stop Button:
q
8.
Fast Wind Buttons: t( /
w
9.
Play Botton:
0
10. External DC Power Input Socket
Il.
Tuning Control
12. Band Selector Switch
13.
Cassette Compartment
14.
Battery Compartment
15.
Headphones
1
2345
\
\ \
Figure
2-l
Figure 2-2
Figure 2-3
-2-
DISASSEMBLY
Caution on Disassembly
Follow the below-mentioned notes when disassem-bling the
unit and reassembling it, to keep its safety and excellent
performance:
1,
Take cassette tape out of the unit.
2.
Be sure to remove the batteries from the unit.
3.
After servicing 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.
Front
Cabinet
Cassette
Compartment
I
(Front Cabinet)
k
Rear Cabinet,
1 y
(‘& (Front Cabinet)
Button Cover
(B%on Cover)
Black
Figure 3-l
Figure 3-2
Figure 3-3
(Dl\ x
1
Front
’
\
Cabinet
u
,y/
‘Motor
Figure 3-4
(Fl)
x 2
Mechanism
Block
v
Motor
Figure 3-5
REMOVING AND REINSTALLING THE MAIN PARTS
TAPE MECHANISM SECTION
Perform steps 1, 2, 5, 6 and 7 of the disassembly method to
remove the tape mechanism. (See Page 3.)
How to remove the playback head
(See Fig. 4-l
.)
1.
Removethescrews(A1) x2pcs.,
to remove the playback head.
Note: After replacing the playback head and completing the
azimuth adjustment, be sure to apply screwlock.
How to remove the pinch roller
(See Fig. 4-l.)
1.
Rotate the pinch roller
(Bl) x
2
PCS.,
as shown in @ and raise
it.
How to remove the main/motor belt
(See Fig. 4-2.)
1. Remove the motor belt (Cl) xl pc.
2. Remove the main belt (C2) x 1
pc.
How
to remove the motor
(See Fig. 4-2.)
I.
Remove the motor belt (Cl) x 1 pc.
2. Remove the screws
(Dl)
x 2
PCS.,
to remove the motor.
How to remove the flywheel
(See Figs. 4-2 and 4-3.)
1. Remove the main belt (C2) x 1 pc.
2. Remove the washers
(Dl)
x
2pcs.
3. Remove the stop washers (D2) x 2
PCS.,
with a small precision
screwdriver to extract flywheel from the capstan
matal.
Note: When the stop washer is deformed or damaged, replace it
with a new one.
How to reinstall the parts
Install each part in the reverse order of the removal with care.
(Al) x 2
$2
x 2.2mm
Playback
a
Head
Figure
4-1
(DlIx2
Flywheel
Figure 4-2
Flywheel
Figure 4-3
-4-
ADJUSTMENT
TUNER SECTION
fL: Low-range frequency
fH:
High-range frequency
l
AM IF/RF
MECHANISM SECTION
l
Driving Force check
I
Torque Meter
Specified value
Play: TW-2412
Reverse play:
TW-2422
l
Torque Check
Torque Meter
Over 30
g
Over 30
g
Specified value
rest Stage
Adjusting Point
runing
doltage
1
VR301
Voltage Vt = 14.65 + 0.01
V
(input: Antenna
Output: TP5)
2 1. VRl
(fH)
Voltage Vt = Obtain 9
+O.l V
2. VR2 (Input: Antenna
Output:
TPl)
3 1.
VRl (fL)
Voltage Vt = Obtain 1.5 + 0.03
V
2. VR3 (input: Antenna
1
Output:
TPl)
4
Repeat steps 2 and 3 until no further improvement
can be made.
Specified Value/
Instrument Connection
1
Plav: TW-2111
1
Reverse play: Tw-2121
1
Fast forward:
TW-2231
I 20 to 50
a.cm
I
20 to 50
g.cm
I
1
55
g.cm
I
l
Head Azimuth
I
Test Tape
I
Instrument Connection
I
)
Ml-T-114
1
Headphones Socket
T
F
Tl
(455
kHz)
Obtain the best output.
(Input: Antenna.
Output: TP3)
Maximize the output.
(Input: Antenna
Output: Headphones Socket)
(Lord resistance: 24 ohms)
l
Tape Speed
Test Tape Adjusting Specified value Instrument Connection
Point
MTT-111
VR201
3,000 + 90 Hz
Headphones Socket
3and
:overage
fL: L3
(510
kHz)
fH:
TC3
(1,650
kHz)
Tracking
fL: L4
(600
kHz)
fH:
Checking
(I ,400
kHz)
Maximize the output.
(input: Antenna
Output: Headphones Socket)
(Lord resistance: 24 ohms)
I
l
FM IF/RF
Test Stage
Adjusting Point Specified Value/
Instrument Connection
IF
Checking
(10.7
MHz)
Check the S curve to the center.
(Input: TP2
Output: TP3)
------I
Maximize the output.
(Input: TP4
Output: Headphones Socket)
(Lord resistance: 24 ohms)
Band
coverage
fL: L2
(87.3 MHz)
fH:
TC2
(108.3
MHz)
Tracking
fL: Ll
(88 MHz)
fH:
Checking
(108MHz)
Maximize the output.
(Input: TP4
Output: Headphones Socket)
(Lord resistance: 24 ohms)
[
TUNER PWB-A
/
( IAM TRACKlNGfL]
7
Top1
\ FM TRACKING
fL\
FM BAND COVERAGE
TC2tZl
fH 1
fL
AMBANDCOVERAGE
Figure 5 ADJUSTMENT POINTS
-5-
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