Disassembly - Sharp QT-90W Service Manual

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
1 Rear Cabinet 1. Battery Lid ............ (A1) x1
2. Screw ................... (A2) x6
3. Screw ................... (A3) x4
2 Front Cabinet 1. Knob ..................... (B1) x1
2. Nut ........................ (B2) x1
3. Socket .................. (B3) x4
3 Jack PWB 1. Socket .................. (C1) x2
2. Screw ................... (C2) x2
4 Volume PWB 1. Socket .................. (D1) x1
5 Battery PWB 1. Socket .................. (E1) x1
2. Hook ..................... (E2) x1
6 Headphones PWB 1. Socket .................. (F1) x2
2. Screw ................... (F2) x1
7 Main PWB with 1. Screw ................... (G1) x2
Tape Mechanism 2. Screw ................... (G2) x1
8 Main PWB 1. Socket .................. (H1) x2
2. Screw ................... (H2) x4
3. Solder ................... (H3) x2
9 Tape Mechanism 1. Open the cassette holder.
2. Screw .................... (J1) x4
10 Surroud PWB 1. Screw ................... (K1) x3
11 Graphic Equalizer 1. Screw ................... (L1) x2
PWB
How to attach the tuning display label
(See Fig. 3-4.)
1. Start Stick Label Matching
5
Tuning Display Label
Figure 3-4
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DISASSEMBLY

PROCEDURE FIGURE
3-1
3-1
3-2
3-2
3-2
3-2
3-2
3-2
3-3
4-1
4-2
4-2
Reference
With Base Line
Base Line
Dial Drum
2. This Line Must Be
Stick Matching
Volume
PWB
(B1)x1
(B2)x1
Rear Cabinet
(A3)x4
ø3x12mm
Headphones
PWB
Tape Mechanism
(F1)x1
(F2)x1
ø4x14mm
(E2)x1
Battery
PWB
(E1)x1
(F1)x1
(D1)x1
(B3)x1
(C1)x1 (C1)x1
(B3)x1 (B3)x1
(H2)x4
ø3x10mm
(H3)x2
Tape
Mechanism
Main PWB
– 3 –
QT-90W
Front Cabinet
(A2)x6
ø3x30mm
(A1)x1
Figure 3-1
Lug Wire
(G1)x2
Handle
ø3x12mm
(G2)x1
ø3x8mm
(B3)x1
Rear Cabinet
(C2)x2
Jack PWB
ø4x14mm
Main PWB
Figure 3-2
(H1)x2
Figure 3-3