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Ω

Procedure :
1.  Turn the power on.
2.  Input the following signal from Signal Generator to FM an-

tenna input directly.

Carrier frequency : A = 87.5 MHz, B = 98 MHz, C = 108 MHz
Deviation 

: 75 kHz

Modulation 

: 1 kHz

ANT input 

: 35 dBu (EMF)

Note: Please use 75 ohm “coaxial cable” to connect SG and the set. You 

cannot use video cable for checking.

 

  Please use SG whose output impedance is 75 ohm. 

 
3.  Set to FM tuner function and scan the input FM signal with 

automatic scanning.

4. Confi rm that input Frequency of A, B and C detected and auto-

matic scanning stops.

 
The stop of automatic scanning means “The station signal is re-
ceived in good condition”.

IC801 pin XL
(TUNER VT) 

IC801 pin RT
(TUNER OUT L-ch) 

Note:
•  All capacitors are in 

μF unless otherwise noted. (p: pF) 50 

WV or less are not indicated except for electrolytics and 
tantalums.

•  All resistors are in 

Ω and 1/4 W or less unless otherwise 

specifi ed.

•      

f : 

internal 

component.

• 

2 : nonfl ammable resistor.

• 

C : panel designation.

• 

A : B+ Line.

• 

B : B– Line.

• 

H : adjustment for repair.

•  Voltages and waveforms are dc with respect to ground 

under no-signal (detuned) conditions.

– CD Board –
  no mark : CD PLAY
– DECK Board –
  no mark : TAPE PLAY
  (         ) : TAPE REC
– Other Boards –
  no mark : TUNER (FM/AM)
  (        ) : TAPE PLAY
  <       > : TAPE REC
  {        } : CD PLAY
•  Voltages are taken with VOM (Input impedance 10 M

Ω).

  Voltage variations may be noted due to normal production 

tolerances.

•  Waveforms are taken with a oscilloscope.
  Voltage variations may be noted due to normal production 

tolerances.

•  Circled numbers refer to waveforms.

• Signal path.
 

F : 

FM

 

f : 

AM

 

J 

: CD PLAY

 

E : 

TAPE 

PLAY

 

j : 

REC

 

i : AUDIO IN

Note:
• 

X : parts extracted from the component side.

• 

Y : parts extracted from the conductor side.

•   

W  : indicates side identifi ed with part number.

•      

f  : internal component.

• 

 : Pattern from the side which enables seeing.

  (The other layers' patterns are not indicated.)

•  Indication of transistor.

 

 

Note: The components identifi ed by mark 

0 or dotted 

line with mark 

0 are critical for safety. 

 

Replace only with part number specifi ed.

Caution:
Pattern face side:
(Conductor Side)
Parts face side: 
(Component Side)

Parts on the pattern face side seen from 
the pattern face are indicated.
Parts on the parts face side seen from 
the parts face are indicated.

HCD-EC68W

IC101 XG (XO)
(CD play mode)

RB

CN501  (EH)

μs/DIV

μs

IC101 JB (RFi)
(CD play mode)

XB

IC801 RM (XIN)

μs/DIV

μs

FT

IC301 PT (X1)

FB

IC301 RG (X1A)

μs/DIV

μs

HCD-EC68W

R150

R149

R148

R108

R154

R153

C148

C1

10

C10

9

C301

C303

C302

C104

R1

10

C1

16

C404

R203

R204

R205

R206

R207

R208

R209

R210

R219

R223

R222

R147

R221

R218

R146

R145

C150

R113

C403

R202

C151

C108

C105

C147

C146

C145

C152

C1

18

C1

17

C144

C101

C125

CN201

C143

C120

R144

R157

C142

C141

C140

C100

C107

R408

R156

C124

C127

C126

CN301

R101

C1

19

C102

R415

R414

C103

R405

C113

R102

R402

R105

R106

C132

C138

C137

R135

R134

R136

R130

R128

R129

R143

R139

C136

R120

R114

C153

C112

R125

R126

C149

C139

R127

R1

18

R140

R151

C122

C123

R220

R104

S201

R155

C128

C106

C201

R304

R302

C309

C205

C207

C307

R303

C133

R111

R112

C115

R21

1

Q301

R301

C204

C202

C206

C306

R212

C401

C130

X102

C405

IC201

IC401

R201

R142

CD BOARD

(COMPONENT SIDE)

CD BOARD

(CONDUCTOR SIDE)

3

1

4

5

1

7

8

14

28

22

21

15

TP124

(VC)

TP121

(RFI)

1

25

26

50

51

75

76

100

1

21

16

1

1-872-135-

11

(11)

1-872-135-

11

(11)

OPTICAL PICK-UP BLOCK

(KSM-213DCP)

A

B

C

D

E

F

1

2

3

4

5

6

7

8

9

E

(LIMIT)

M401

(SPINDLE)

M402

(SLED)

M

M