ICF-CD2000, ICF-CD2000S - Sony Audio Service Manual (repair manual). Page 4

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1-673-930-

11

(11)

C586

C585

C587

C493

C495

R478

R844

99

R476

C419

R483

R477

C551

C545

C565

C569

C807
C806
C805

R591

R567

C505

R565

R850

C619

C609

C542

R535

C536

C533

C555

R851

C554

R524

C516

R525

R501

R575

R576

R558

R557

R566

R854

R568

C504
C559

C506

R584

R631

C540

R552

R553

R549

C494

FB401

L508

L515

C510

L501

C801

C553

C552

C803

R632

C502

C519

R539

D512

D501

Q601

IC404

C534

+

C543

+

C610

+

C608

+

C541

+

C535

+

C520

+

C564

+

C568

+

C595

+

C515

+

C561

+

14

13

8

1

9

16

AK

A

K

D504

A
A

K

Q514

Q507

Q505

B C E

B C E

BC

E

BC

E

Q503

2E2B 1C

2C1B 1E

Q502

2E2B1C

2C1B 1E

2B 2E

TP

(IOP 0)

TP

(IOP 1)

1C

1B 2C

1E

2C
1B
1E

2E
2B
1C

Q501

Q513

L511

TP

(RF)

TP

(TE)

TP

(GND)

TP

(VC)

+
–

digital voltmeter

(DC3 V range)

1. Remove the upper panel.
2. Connect a digital voltmeter as show in Fig. 2.
3. Press the 

[CD     ]

 key.

4. Calculate current value by the reading of the digital voltmeter.

Reading of the digital voltmeter (V) 

÷

 2.2 (

Ω

) = current value

(A)
(Example) Reading of the digital voltmeter of 0.082 V:
0.082 V

÷

2.2 

Ω

= 0.037 (A) = 37 mA

Current value of the specified: 16 to 18 mA

5. Check that the current value is within the following range.

• Current value of the specified 

 mA (25 ˚C)

Variation by temperature: 0.4 mA/˚C
Current increases with temperature increased.
Current decreases with temperature decreased.

If the current is more than the range above, there is a trouble
in the automatic power control circuit or the laser diode is in
deterioration.
If less than the range, a trouble exists in the automatic power
control circuit or the optical pick-up.

u

+5
–11