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.)
5
Tuning Display Label
Figure 3-4

DISASSEMBLY

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