SHARP QT-80W Service Manual
QT-80W
SERVICE MANUAL
No. S4129QT80W///
STEREO RADIO CASSETTE RECORDER
MODEL
• In the interests of user-safety the set should be restored to its
original condition and only parts identical to those specified should
be used.
QT-80W
CONTENTS
Page
SPECIFICATIONS ............................................................................................................................................................. 2
VOLTAGE SELECTION..................................................................................................................................................... 2
AC POWER SUPPLY CORD AND AC PLUG ADAPTOR ................................................................................................. 2
NAMES OF PARTS ........................................................................................................................................................... 3
HOW TO SET THE POINT "0" ON TUNER DIAL MEMORY............................................................................................. 3
DISASSEMBLY.................................................................................................................................................................. 4
REMOVING AND REINSTALLING THE MAIN PARTS..................................................................................................... 5
ADJUSTMENT ................................................................................................................................................................... 7
SCHEMATIC DIAGRAM .................................................................................................................................................. 10
WIRING SIDE OF P.W.BOARD....................................................................................................................................... 12
NOTES ON SCHEMATIC DIAGRAM .............................................................................................................................. 14
TYPES OF TRANSISTOR ............................................................................................................................................... 14
VOLTAGE ........................................................................................................................................................................ 14
PARTS GUIDE/EXPLODED VIEW
SHARP CORPORATION
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
QT-80W
FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER
TO THE OPERATION MANUAL.
General
Power source
Power consumption
Output power
Speakers
Output terminal
Input terminals
Dimensions
Weight
Radio
Frequency range
Tape recorder
Frequency response
Signal/noise ratio
Wow and flutter
Motor
Bias system
Erase system
SPECIFICATIONS
AC 110-127/220-240 V, 50/60 Hz
DC 12 V [“D” size (UM/SUM-1, R20 or HP-2) battery x 8]
20 W
MPO: 18 W (9 W + 9 W) (AC operation, 10 % T.H.D)
RMS: 10 W (5 W + 5 W) (DC operation, 10 % T.H.D)
8 cm (3-1/8”) full range speaker x 4
Headphones: 16-50 ohms (recommended: 32 ohms)
Mixing microphone: 600 ohms
Line input: 350 mV/47 kohms
Width: 520 mm (20-1/2”)
Height: 191 mm (7-1/2”)
Depth: 216 mm (8-1/2”)
4.2 kg (9.3 lbs.) without batteries
FM: 88 - 108 MHz
SW1: 2.3 - 7.3 MHz
SW2: 7.3 - 22 MHz
MW: 526.5 - 1,606.5 kHz
60 - 12,000 Hz (Normal tape)
40 dB
0.3 % (WRMS)
DC 9 V electric governor
AC bias
Magnet erase
Specifications for this model are subject to change without prior notice.
VOLTAGE SELECTION
Before operating the unit on mains, check the preset voltage. If the voltage is different from your local voltage, adjust the voltage
as follows. Slide the selector with a screwdriver to the appropriate voltage number. (AC 110 - 127 V or AC 220 - 240 V)
AC POWER SUPPLY CORD AND AC PLUG ADAPTOR
92L3404-074001
QACCB0012AW00
QACCE0007AW00
QACCL0002AW00/QACCL0008AW00
QPLGA0003AWZZ
QPLGA0004AWZZ
– 2 –
NAMES OF PARTS
QT-80W
01. Function/Beat Cancel Switch
02. Cassette Compartment
03. Record Button
04. Play Button
05. Rewind Button
06. Fast Forward Button
07. Stop/Eject Button
08. Pause Button
09. Volume Control
10. Band Selector
11. Built-in Microphone
12. Extra Bass Button
13. Fine Tuning Control
14. Tuning Control
15. Mixing Microphone Socket
16. Line Input Sockets
17. AC Voltage Selector
18. AC Input Socket
19. Battery Compartment
20. Headphone Socket
12345678910
15
11 12 13
16
14
17
18
HOW TO SET THE POINT "0" ON TUNER DIAL MEMORY
1. Remove the front cabinet and main PWB. (Refer to page 4,
of disassembly section.)
2. Turn the gear dial in the arrowed direction until it stops so
that the " " mark comes to the front of main PWB.
3. When the tuning knob is set at 2, adjust it from above so that
its "0" point rib comes to the right of "0" point rib of the dial
drum when you face the unit.
4. Check the tuning display label by turning the tuning knob.
The frequency band will be FM 88 - 108 MHz when the dial
is turned counter-clockwise.
5. Reassemble the front cabinet.
Tuning Knob
Dial Drum
Dial Drum “0”
Point Rib
Top Side
2
19
Gear Dial
Mark “ ”
Main PWB Front Side
Tuning Knob “ 0 ” Point Rib
20
Mark “ ”
Dial Drum
Tuning Knob
Bracket
Dial Drum “0” Point Rib
– 3 –
Front Side
“0” Point of Tuning Display
3
Tuning Knob
Tuning Knob “0” Point Rib
Main PWB
Figure 3
QT-80W
DISASSEMBLY
Caution on Disassembly
Follow the below-mentioned notes when disassembling the
unit and reassembling it, to keep it safe and ensure excellent
performance:
1. Take cassette tape out of the unit.
2. Be sure to remove the power supply plug from the wall
outlet before starting to disassemble the unit.
3. Take off nylon bands or wire holders where they need to
be removed when disassembling the unit. 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.
STEP REMOVAL PROCEDURE FIGURE
1 Rear Cabinet 1. Battery Lid............ (A1) x1 4-1
2. Screw ................... (A2) x6
3. Screw ................... (A3) x4
2 Front Cabinet 1. Knob..................... (B1) x1 4-1
2. Nut........................ (B2) x1
3. Socket .................. (B3) x3 4-2
3 Jack PWB 1. Socket ..................(C1) x2 4-2
2. Screw ...................(C2) x2
4 Volume PWB 1. Socket ..................(D1) x1 4-2
5 Battery PWB 1. Socket .................. (E1) x1 4-2
2. Hook..................... (E2) x1
6 Headphones PWB 1. Socket .................. (F1) x1 4-2
2. Screw ................... (F2) x1
7 Main PWB with 1. Screw ...................(G1) x2 4-2
Tape Mechanism 2. Screw ...................(G2) x1
8 Main PWB 1. Socket ..................(H1) x2 4-3
2. Screw ...................(H2) x4
3. Solder................... (H3) x2
9 Tape Mechanism 1. Open the cassette holder. 5-1
2. Screw ....................(J1) x4
10 X-BASS PWB 1. Screw ................... (K1) x3 5-2
(B1)x1
(B2)x1
Rear Cabinet
(F2)x1
ø4x10mm
Battery PWB
(E2)x1
Main PWB
(C1)x1
(B3)x2
Front Cabinet
Volume
PWB
(A3)x4
ø3x12mm
Figure 4-1
Headphones PWB
Tape Mechanism
Handle
(D1)x1
(G1)x2
ø3x12mm
(C2)x2
ø4x14mm
(A2)x6
ø3x30mm
(A1)x1
Lug Wire
(G2)x1
ø3x8mm
(B3)x1
Jack
PWB
Rear
Cabinet
How to attach the tuning display label
(See Fig. 4-4.)
Reference
1. Start Stick Label Matching
With Base Line
Base Line
10
108
1600
9
22.0
7.3
19.0
1400
6.0
104
1200
5.0
15.0
8
7
6
5
100
1000
800
4.0
12.0
Tuning Display Label
96
4
3.2
10.0
700
0
1
88
2
3
540
92
2.3
7.3
600
2.6
8.5
2. This Line Must Be
Stick Matching
Figure 4-4
Dial Drum
– 4 –
Main
PWB
(C1)x1
(F1)x1
(H1)x2
(H3)x2
Tape Mechanism
(E1)x1
Figure 4-2
(H2)x4
ø3x10mm
Main PWB
Figure 4-3
QT-80W
Tape Mechanism
Stop/Eject Button
Push
Cassette
Holder
Open
(J1)x4
ø3x10mm
REMOVING AND REINSTALLING THE MAIN PARTS
TAPE MECHANISM SECTION
Perform steps 1 to 9 of the disassembly method to remove the
tape mechanism. (See page 4.)
Front Cabinet
X-BASS
Figure 5-2Figure 5-1
(K1)x3
ø2.6x8mm
PWB
How to remove the record / playback and erase
heads (See Fig. 5-3.)
1. Remove the screws (A1) x 2 pcs., to remove the record/
playback head.
2. Remove the hooks (A2) x 2 pcs., toward the center position
as shown in Fig. 5-3. and then extract the erase head
upward.
Note:
After replacing the heads and performing the azimuth
adjustment, be sure to apply screwlock.
How to remove the pinch roller (See Fig. 5-4.)
1. Remove the screw (B1) x 1 pc., and remove the pinch roller
upwards.
Push
PLAY
Button
Hook
(A2)x2
Erase Head
(A1)x2
ø2x7mm
Lug Wire
Record/Playback
Head
Figure 5-3
(B1)x1
ø1.5x2.5mm
– 5 –
Pinch Roller
Figure 5-4
QT-80W
How to remove the belts (See Fig. 6-1.)
1. Remove the main belt (C1) x 1 pc., from the motor pulley.
2. Remove the FF/REW belt (C2) x 1 pc., from the REW/FF
roller.
3. Put on the belts in the reverse order of removal.
Note:
When putting on the belt, ascertain that the belt is not twisted,
and clean it.
How to remove the motor
(See Fig. 6-2.)
1. Remove the main belt. (See Fig. 6-1.)
2. Remove the screws (D1) x 2 pcs., to remove the motor
bracket.
3. Remove the screws (D2) x 2 pcs., to remove the motor.
Note:
When mounting the motor, pay attention to the motor bracket
angle.
Main Belt
(C1)x1
Flywheel
FF/REW Belt
(C2)x1
Figure 6-1
(D1)x1
ø2x4mm
Motor
Motor
Motor Pulley
REW/FF
Roller
Motor Bracket
(D1)x1
ø2x4mm
How to remove the flywheel (See Fig. 6-3.)
1. Remove the belt. (See Fig. 6-1.)
2. Remove the stop washer (E1) x 1 pc., with a small precision
screwdriver to extract the flywheel from the capstan metal.
Note:
When the stop washer is deformed or damaged, replace it
with a new one.
(D2)x2
ø2.6x1.6mm
Special Screw
(E1)x 1
Stop Washer
Washer
Washer
Flywheel
Motor Bracket
Motor
Figure 6-2
Driver
How to reinstall the parts
Install each part in the reverse order of the removal with care.
Figure 6-3
– 6 –
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