Sharp QT-90W, Service Manual

Page: 3 / 20

QT-90W
– 3 –
1 Rear Cabinet 1. Battery Lid ............ (A1) x1 3-1
2. Screw ................... (A2) x6
3. Screw ................... (A3) x4
2 Front Cabinet 1. Knob ..................... (B1) x1 3-1
2. Nut ........................ (B2) x1
3. Socket .................. (B3) x4
3-2
3 Jack PWB 1. Socket .................. (C1) x2 3-2
2. Screw ................... (C2) x2
4 Volume PWB 1. Socket .................. (D1) x1 3-2
5 Battery PWB 1. Socket .................. (E1) x1 3-2
2. Hook ..................... (E2) x1
6 Headphones PWB 1. Socket .................. (F1) x2 3-2
2. Screw ................... (F2) x1
7 Main PWB with 1. Screw ................... (G1) x2 3-2
Tape Mechanism 2. Screw ................... (G2) x1
8 Main PWB 1. Socket .................. (H1) x2 3-3
2. Screw ................... (H2) x4
3. Solder ................... (H3) x2
9 Tape Mechanism 1. Open the cassette holder. 4-1
2. Screw .................... (J1) x4
10 Surroud PWB 1. Screw ................... (K1) x3 4-2
11 Graphic Equalizer 1. Screw ................... (L1) x2 4-2
PWB
DISASSEMBLY
STEP REMOVAL PROCEDURE FIGURE
Figure 3-3
Figure 3-1
Figure 3-2
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.
Figure 3-4
How to attach the tuning display label
(See Fig. 3-4.)
(B1)x1
(A1)x1
(B2)x1
Front Cabinet
Rear Cabinet
Volume
PWB
(A3)x4
ø3x12mm
(A2)x6
ø3x30mm
(H2)x4
ø3x10mm
(H1)x2
(H3)x2
Tape
Mechanism
Main PWB
(G1)x2
ø3x12mm
(G2)x1
ø3x8mm
(E2)x1
(F1)x1
(E1)x1
(F1)x1
(B3)x1
(C1)x1
(B3)x1 (B3)x1
(D1)x1
(C1)x1
(B3)x1
Jack PWB
Main PWB
Battery
PWB
Headphones
PWB
Tape Mechanism
Rear Cabinet
Lug Wire
Handle
(F2)x1
ø4x14mm
(C2)x2
ø4x14mm
5 6
7
8
9
10
4
3
2
1
0
100
104
108
96
92
88
600
540
700
800
1000
1200
1400
1600
2.3
3.2
2.6
4.0
5.0
6.0
7.3
7.3
8.5
10.0
12.0
15.0
19.0
22.0
Reference
1. Start Stick Label Matching
With Base Line
2. This Line Must Be
Stick Matching
Base Line
Dial Drum
Tuning Display Label