DOWNLOAD Sharp CD-DP2500 (serv.man27) Service Manual ↓ Size: 5.13 MB | Pages: 74 in PDF or view online for FREE

– 13 –

1

Front Panel

1. Front Panel ............ (A1) x1

13-5

2

Woofer

1. Screw ..................... (B1) x4

13-5

4

Tweeter

1.  Screw .................... (C1) x2

13-5

5

Super Tweeter

1.  Screw .................... (D1) x2

13-5

(Q2) x3

(Q1) x1

(R1) x5

(Q1) x1

Loading
Motor
PWB

CD
Mechanism

Screw Driver

Woofer

(A1)x1

(B1)x4

Ø4x12mm

(C1)x2

Ø3x10mm

(D1)x2

Ø3x10mm

Turntable

Disc Tray

(M2) x1

CD Player Unit

(M1) x2

1

3

2

(N1) x3

(N1) x3

(P3) x2

(P2) x2

(P3) x2

CD Servo

PWB

CD Player

Base

(P1)x1
ø3x8mm

– 14 –

Perform steps 1 to 7 and 11 of the disassembly method to
remove the tape  mechanism.

1. When you remove the screw  (A1) x 2 pcs., the recording/

playback head and three-dimensional head of the erasing
head can be removesd.

1. When you remove the screw  (B1) x 2 pcs., the playback

head.

1. Carefully push the inside claw to remove it. The pinch roller

pawl in the direction of the arrow <A>, and remove the pinch
roller (C1) x 1 pc., in the direction of the arrow <B>.

Note:
When installing the pinch roller, pay attention to the spring
mounting position.

1. Remove the main belt (D1) x 1 pc., from the motor side.
2. Remove the FF/REW belt (D2) x 1 pc.

1. Remove the main belt (E1) x 1 pc., from the motor side.
2. Remove the FF/REW belt (E2) x 1 pc.

1. Remove the screws (F1) x 2 pcs., to remove the motor.

TAPE 2

TAPE1
Main Belt
(D1)x1

TAPE2
Main Belt
(E1)x1

TAPE 1

Main Belt

FF/REW
Belt
(E2)x1

FF/REW
Belt
(D2)x1

Motor

Motor

(A1)x2
Ø2 x 9mm

TAPE 2

Record/Playback
Head

Erase Head

(B1)x2
Ø2 x 9mm

TAPE 1

Playback
Head

Pinch Roller
(C1)x1

Pinch Roller
Pawl

(F1) x2

Ø 2.6 x 5mm

Motor

– 15 –

1. Remove the stop washer (B1) x 1 pc., to remove the gear

(B2).

2. Remove the screws (B3) x 2 pcs., to remove the shaft (B4).
3. Remove the pickup.

Perform steps 1, 2, 3, and 13 to 15 of the disassembly method
to remove the CD mechanism.

1. Bend the hooks (A1) x 5 pcs., to remove the loading motor.

Note
After removing the connector for the optical pickup from the
connector wrap the conductive aluminium foil around the front
end of connector so as to protect the optical pickup from
electrostatic damage.

(A1)x2

(A1)x1

Loading Motor

CD Base

(A1)x2

(B1) x2
  ø2.6 x6mm

Shaft
(B2) x1

Stop Washer
(B3) x1

Gear
(B4) x1

CD Mechanism

Pickup

•

Play: TW-2111

Tape 1: Over 80 g
Tape 2: Over 80 g

•

Play: TW-2111

30 to 80 g. cm

30 to 80 g.cm

Fast forward: TW-2231

—

70 to 180 g.cm

Rewind: TW-2231

—

70 to 180 g.cm

Normal

MTT-111

Variable

3,000 

±

Speaker

speed

Resistor in

30 Hz

terminal

motor.

(Load

(MM1)

resistance:
6 ohms)

•

TAPE MECHANISM

Motor

Variable Resistor in motor

– 16 –

• 

Signal generator: 400 Hz, 30%, AM modulated

*1. Input: Antenna

Output: TP302

*2. Input: Antenna

Output: TP301

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

AM IF

450 kHz

1,620 kHz

T351

*1

AM Band

—

522 kHz

(fL): T306

*2

Coverage

1.1 

±

 0.1 V

AM Tracking 990 kHz

990 kHz

(fL): T303

*1

[Servo System Error]

0001

Cannot detect Pickup-in SW

0002

DSP access error

[Error during close operation]

0101

Open/Close SW not functioning (Low 

→

 High)

0103

Open/Close SW not functioning (High 

→

 Low)

[Error during open operation]

0201

Open/Close SW not functioning (Low 

→

 High)

0203

Open/Close SW not functioning (High 

→

 Low)

[Error during skip operation]

0302

Pickup-in SW is not detected

0306

During Disc 1 search, Open/Close SW or Clamp SW
or Disc SW do not change to low.

0307

Clamp SW not function (Low 

→

 High)

0308

Clamp SW not function (High 

→

 Low)

Since this CD system incorporates the following automatic
adjustment functions, readjustment is not needed when
replacing the pickup. Therefore, different PWBs and pickups
can be combined freely.
Each time a disc is changed, these adjustments are
performed automatically. Therefore, playback of each disc
can be performed under optimum conditions.

(1) Offset adjustment (The offset voltage between the head

amplifier output and the VREF reference voltage is
compensated inside the IC.)

  * Focus offset adjustment
  * Tracking offset adjustment

(2) Tracking balance adjustment (waveform drawing 14-2

EFBL)

(3) Gain adjustment (The gain is compensated inside the IC

so that the loop gain at the gain crossover frequency will
be 0dB.)

  * Focus gain adjustment
  * Tracking gain adjustment

•  Adjustment

EFBL

FDO

TE

Stopped

T303

CF301

T351

CF352

CF351

CF302

IC303

T306

IC302

FE301

CNP301

 SO301
FM75 ohms

 AM LOOP
ANTENNA

MAIN PWB

AM Tracking

AM Band Coverage

AM IF

TP301

TP302