DOWNLOAD Sharp QT-CD161H (serv.man2) Service Manual ↓ Size: 1.91 MB | Pages: 40 in PDF or view online for FREE

– 5 –

1

Rear Cabinet

1. Screw ................. (A1) x10

5-1

2. Socket .................. (A2) x1

5-2

2

Top Cabinet

1. Knob ..................... (B1) x1

5-2

(with CD Mechanism/ 2. Screw ................... (B2) x3
Tape Mechanism/

3. Socket .................. (B3) x1

Main PWB)

3

Main PWB/

1. Screw ................... (C1) x9

5-3,6-1

Switch PWB/

2. Socket .................. (C2) x4

5-3,6-1

Headphones PWB 3. Soldering .............. (C3) x3

5-3

4

Surround PWB

1. Screw ................... (D1) x2

5-3

(162H Only)

5

Tape Mechanism

1. Screw ................... (E1) x4

6-1

6

CD Mechanism

1. Screw ................... (F1) x3

6-1

7

Terminal PWB

1. Screw ................... (G1) x5

6-2

2. Hook ..................... (G2) x1

8

Battery PWB

1. Hook ..................... (H1) x2

6-3

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 and compact disc 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.

Headphones
PWB

(C1)x6
ø3x10mm

(C1)x2
ø3x10mm

Main PWB

Top Cabinet

(C2)x1

(C3)x3

(C2)x2

Switch
PWB

(D1)x2
ø3x10mm

SURROUND
PWB

162H ONLY

(A1)x3
ø3x12mm

(A1)x1
ø3x12mm

(A1)x6
ø3x20mm

Rear Cabinet

Front Cabinet

(B2)x2
ø3x10mm

(A2)x1

(B3)x1

Front Cabinet

Top Cabinet

(B1)x1

Main PWB

(B2)x1

ø3x10mm

– 6 –

Perform steps 1, 2, 3 and 5 of the disassembly method to
remove the CD mechanism.

1. Remove the screws (A1) x 2 pcs., to remove the shaft (A2)

x1 pcs.

2. Remove the stop washer (A3) x1 pcs., to remove the gear

(A4) x 1 pcs.

3. Remove the pickup.

Top Cabinet

Tape

Mechanism

CD Mechanism

(F1)x3
ø2.5x10mm

(C1)x1
ø2.5x8mm

(E1)x4
ø3x10mm

(C2)x1

(G1)x2
ø3x12mm

(G1)x1
ø3x10mm

(G1)x2
ø3x10mm

Terminal PWB

Driver

Push

(G2)x1

Rear Cabinet

(A1) x2
ø2.6 x6mm

Stop 
Washer
(A3) x1

CD 
Mechanism

Gear
(A4) x1

Shaft
(A2) x1

Pickup

Rear Cabinet

(H1)x1

(H1)x1

Battery PWB

Pull

Pull

– 7 –

PLAY: TW-2412

Over 120 g

Play: TW-2111

25 to 65 g.cm

Fast Forward: TW-2231

60 to 130 g.cm

Rewind: TW-2231

60 to 130 g.cm

MTT-111 Variable

3,000 

±

 90 Hz

Output: Speaker

Resistor in

Teaminal

motor(M601)

(CNP201 Load
resistance: 8 ohms)

Volume control

Max

Function switch

Tape/Power Off

X-BASS

On

Surround (162H ONLY)

On

MTT-118

1.8 V 

±

 3 dB

Speaker Terminal
(CNP201 Load resistance: 8 ohms)

MTT-114

Output: Speaker Terminal
(CNP201 Load resistance: 8 ohms)

L301

82 kHz 

±

 6 kHz

Pin 2 of CNP201

– 6 kHz

fL: Low-range frequency
fH: High-renge frequency

IF

450 kHz

1,620 kHz

T3

*1

 Band

—

522 kHz

(fL): L4

*3

Coverage

1.35 

±

 0.05 V

Tracking

600 kHz

600 kHz

(fL): L3

*2

1,400 kHz

1,400 kHz

(fH):TC1

•  FM RF
Signal generator: 1 kHz, 75 kHz dev., FM modulated

Band

—

87.50 MHz

(fL): L2

*1

Coverage

2.0 

±

 0.1 V

RF

98.00 MHz

98.00MHz

L1

*2

(10~30 dB)

*1. Input: Antenna,

Output: TP1

*2. Input: Antenna,

Output: Speaker Terminal

•  Detection
Signal generator: 10.7 MHz, FM sweep generator

IF

10.7 MHz

98.00 MHz

T1 (Turn

Input: Pin 1 of

the core of

IC1

T1 fully

Output: TP2

counter-
clockwise.

*1. Input: Antenna,

Output: Pin19 of IC2

*2. Input: Antenna,

Output: Speaker Terminal

*3. Input: Input is not connected,

Output: TP1

•  AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated

VR1

76 kHz 

±

 200 Hz

Pin 13, pin 21 and
ground of IC2

Note:
After preparing the test circuit shown in Fig. 7-1, connect the
Pin 13, Pin 21 and ground of the IC2 with the test circuit, and
measure the value. At  this time, apply a standard unmodulated
signal input and adjust the VCO.

Pin 13 of IC2

Pin 21 of IC2

D

G

S

10 kohm

TO FREQUENCY
        COUNTER

FET : 2SK19 or 2SK54

1

1

VCO

VR1

IC2

T3

L4

L2

IC1

L1

FM IF

T1

TC1

AM TRACKING

L3

AM BAR

ANTENNA

FM ROD ANTENNA

FM BAND

COVERAGE

T2

AM IF

TP2

FM RF

FM DET.

TP1

13

17

19

21

R29

R7

AM BAND

COVERAGE

MAIN PWB

fL

fH

– 8 –

The types of test mode for this microcomputer and specific test mode turning-on procedure are as follows. Only the unit key is used.
The remote control key is not valid. The power must be turned on while two keys are held down.
(1) CD test mode function

The power is turned while the (PRESET 

 ) and STOP (TUNING 

 ) keys are held down.

(2) Tuner test mode function

The power is turned on while the (PRESET 

 ) and PAUSE (BAND) keys are held down.

(3) LCD test mode function

The power is turned on while the (PRESET 

 ) and MEMORY keys are held down.

When the CD test mode is turned on, the CD pickup is moved to the innermost periphery, and the following indication appears.
The operation of CD test mode is as follows.

Indication

(1) The CD pickup is moved with the unit UP key and DOWN key.

UP key: The pickup is slid to the outer periphery.
DOWN key: The pickup is slid to the inner periphery. However, when it reaches the innermost periphery, it does not move further
inward.

(2) When the PLAY key is pressed in stop state, "the laser diode turns on if CD lid is closed" .

Indication

(3) When the PLAY key is pressed in laser ON state, playback is started from the current position of pickup.

Indication

(4) When the STOP key is pressed during playback, the laser goes out and playback is stopped, and the process returns to step

(1). (The pickup position does not change.)

(5) When the MEMORY key is pressed during playback, tracking servo ON/OFF is performed. (Even if the playback is stopped

in servo OFF state, the servo is turned on when the playback is restored.)

Indication

The current pickup position and time are indicated. (When the
pickup is moved with the UP/DOWN key, the time at that point
is indicated.)

The current playback track No. and time are indicated.

The tuner test mode is intended to store the measurement frequency for adjustment and inspection in the preset memory CH
without frequency adjustment in the case of tuner adjustment in the production line.
When the power is turned on while the PRESET 

 (DOWN) key and BAND (PAUSE) key are held down together, the frequency

for adjustment measurement of destination (specified according to AREA terminal) is preset-stored in the preset memory CH. (The
frequency to be preset-stored for specific destination is as shown in the next page.)

Others

While the CD lid is open (LID-SW = "H"), the test mode is turned on but the operations of step (2) and subsequent steps are not
performed. The operation of step (1) is performed.

Contents of error display

Error display

Contents of an error

Er  01

Er  02

when TOC information cannot be read normally.

When a PU-IN SW detection error occurs.