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– 45 –

506

/400

C515
150P

+OUT

+S

TRIM

-OUT

-S

+IN

GATE IN

GATE OUT

-IN

505

/400

C514
150P

UNT501

DC-DC CONVERTER

+

-IN

C519

0.1

C518

0.1

D503

RK36

C509

560/50

+S

TRIM

-OUT

-S

+IN

GATE IN

GATE OUT

C513
150P

C516
150P

C520

0.1

C510

560/50

C512

1

UNT502

DC-DC CONVERTER

+

D504

RK36

R506

62K

R504
820K

R503
820K

R505

62K

RLY501

BI503

CNS503

D505

1SS133

1

2

3

4

1

2

3

4

1

2

3

4

1

2

3

4

1

2

3

4

1

2

3

4

L504

L506

L507

C521

180/50

C522

180/50

C523

2.2

C524

2.2

L505

L508

L509

L510

L511

FIL503

FIL501

CNP541

CNP542

CNS541B

CNS541A

C542

2200/50

C541

2200/50

FIL502

FIL504

C517

0.1

C511

1

+OUT

POWER PWB-C1

POWER SUPPORT PWB-D

CNP101

TO MAIN PWB

P39  11 - H

– 46 –

5

4

Observe 
each pair.

• QA1, QA5
• QA2, QA6
• QA3, QA7
• QA4, QA8

Observe 
each pair.

• QA1, QA5
• QA2, QA6
• QA3, QA7
• QA4, QA8

QA1

(QA2, 3, 4)

COLECTOR

QA5

(QA6, 7, 8)

COLECTOR

QA2

(QA1, 3, 4)

EMITER

QA6

(QA5, 7, 8)

EMITER

2

3

1

• OUTR(+), OUTR(-)
• OUTL(+), OUTL(-)

Observe 
each pair.

Observe 
each pair.

OUTR(+), 
(OUTL(+))

OUTR(-), 
(OUTL(-))

• RA5, RA7
• RA6, RA8

Observe 
each pair.

• QA1, QA5
• QA2, QA6
• QA3, QA7
• QA4, QA8

RA5
(RA6)

RA7
(RA8)

QA2

(QA1, 3, 4)

BASE

QA6

(QA5, 7, 8)

BASE

7

8

6

Observe Li and Hi of 
ICA4 to 7 of each.

Li

Hi

Observe SW section 
of Lch and Rch of each.

Observe 
each pair.

• QA9, QA11
• QA10, QA12
• QA13, QA15
• QA14, QA16

QA10

(QA9,13,14)

GATE

QA12

(QA11,15,16)

GATE

Set -32V at GND for observation of   

6

   to   

8

  .

– 47 –

No

Yes

Does AC100V stand between Pins 1 and 2 of the power
filter PWB connector CNP502?

(LED does not come on and it does not sound.)

• Check the fuse F501.
• Check the parts on the power filter PWB.
• Check the wiring of the inlets SOC501 and CNS501.

No

Yes

Is AC100V supplied between the input L1/L2 of the
rectification unit UNT503?

• Check the wiring of the power switches SW501 and CNS502.

No

Yes

Is any normal voltage is output from the power PWB
B1503/CNS503?

• Check whether CNS502 is wired across ST1 and ST2 of

the rectification unit or not.

• Check the output voltage (OYT terminal) of UNT501 and

UNT502.

• Check the parts (L504 to L511, F502, FS503 and R503 to

R506) on the power PWB.

• Check the 1-bit amplification unit.
   (Try to disconnect CNWAM4 and CNWAM3.)

No

Yes

Is 5V supplied to Pin 13 of the microcomputer IC904?

• Check IC107 output.
• Check R189.

No

Is any oscillating waveform found at Pins 14 (OSC2) and
15 (OSC1)?

• Check X901.
• Check IC904.

No

Yes

Are the speaker relays RLY108 and RLY107 switched?

(when power is supplied and LED is lit.)

• Check whether 12V is supplied to RLY107 and RLY108 or not.
  (Check the surroundings of Q251, Q252, R251 to R253.)
• Check whether 12V is output from IC106 or not.
• Check whether Q118 and Q119 are on or not.
• Check the line Q118 and Q119 from Pin 41 of the
   microcomputer IC904.

Yes

Are they properly wired to the 1-bit amplifying unit?
(CNWAM1, CNWAM2, CNWAM3, CNWAM4)

No

Yes

Is voltage properly supplied to 1-bit amplifier? (CNP102)

• Check whether the proper voltage is output from the power

PWB CNW503 or not.

• Check whether RLY106 is activated or not.
• Check whether Q116 is on or not.
• Check the line Q116 from Pin 42 of the microcomputer

IC904.

No

Yes

Is voltage properly supplied to 1-bit amplifier? (CNP109)

• Check -22V (around Q115 and Q114).
• Check 5V (around Q105 and Q106).
• Check reset 5V.
   (Connection from Pin 21 of the microcomputer IC904.)

No

Is any signal output from the connectors CNP107 and
CNP108 for 1-bit amplifier?

• Check CNS601A/B and main volume, VOL601.
• Check the IC107 output voltage which is supplied to drive

the relay.

• Check the relays RLY601 and RLY602 and drive circuit.

Yes

Check the inside of the 1-bit amplifying unit.

– 48 –

No

Check IC806.

No

Yes

Is any signal input to CNP116 or CNP117?

Check the wiring from the input terminal to CNP116 and
CNP117.

No

Yes

Does it not sound on both Line 1 and Line 2?

Check the wiring from RLY101, RLY102, RLY104 and the
relays to the microcomputer IC904.

No

Yes

Is 5V supplied to drive the relays (RLY101, RLY102 and
RLY104)?

Check IC107.

No

Yes

Is any signal supplied to the analog line amplifying units
Q613, Q614, Q617 and Q618?

Check the wiring from RLY201, RLY601, RLY602 and the
relays to the microcomputer IC904.

No

Is any signal output from the analog line amplifying
units?

Check the line amplifying circuit.

Yes

Is any signal output from CNP108?

Yes

Check the wiring to 1-bit amplifying unit, and 1-bit amplifying
unit.

No

Yes

Is 5V supplied to Pin 3 of CNP801?

Check IC108.

No

Yes

Is any digital signal output from Pin 9 of IC801?

Check IC801.

No

Yes

Is any digital signal output from Pin 4 of IC802?

Check the wiring of CNP801 and CNS801.
Check IC802.

No

Yes

Is any digital signal input to P37 of IC804?

Check the wiring of CNP801 and CNS801.

No

Is any digital signal from IC804 to IC806?
(DATA, MC-, WC, MCC)

Check IC804 and IC805.

Yes

Is any digital signal supplied from IC806 to IC807?

Yes

Is any initial setting signal supplied from Pins 38, 39 and
42 of IC807?

• It does not sound on Digitals 1 to 4 at all.

No

Check the wiring from Pins 38, 39 and 42 of IC807 to the
microcomputer IC904.

Yes

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