Pioneer MAX-10 Service manual

DUAL DRIVE AMPLIFIER

M-AX10

THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).

Type

KU/CA AC120V
NY AC230V

Model

M-AX10

Power Requirement Remarks

ORDER NO.

RRV2345

CONTENTS

1. SAFETY INFORMATION

2. EXPLODED VIEWS AND PARTS LIST

3. SCHEMATIC DIAGRAM

4. PCB CONNECTION DIAGRAM

5. PCB PARTS LIST

6. ADJUSTMENT

PIONEER CORPORATION 4-1, Meguro 1-chome, Meguro-ku, Tokyo 153-8654, Japan

PIONEER ELECTRONICS SERVICE, INC. P.O. Box 1760, Long Beach, CA 90801-1760, U.S.A.
PIONEER EUROPE NV Haven 1087, Keetberglaan 1, 9120 Melsele, Belgium
PIONEER ELECTRONICS ASIACENTRE PTE. LTD. 253 Alexandra Road, #04-01, Singapore 159936

c

PIONEER CORPORATION 2000

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12
24
36
41

2
3

7. GENERAL INFORMATION

7.1 IC

7.2 PROTECTION CIRCUIT

7.3 EXPLANATION

8. PANEL FACILITIES AND SPECIFICATIONS

.................................................................

7.3.1 PRODUCT OVERVIEW

7.3.2 CIRCUIT DESCRIPTION

................................

.............................

............................................

.......................

.....................

T – ZZV JULY. 2000 Printed in Japan

....

42
42
52
54
54
55
58

M-AX10

1. SAFETY INFORMATION

This service manual is intended for qualified service technicians ; it is not meant for the casual do-it­yourselfer. Qualified technicians have the necessary test equipment and tools, and have been trained
to properly and safely repair complex products such as those covered by this manual.
Improperly performed repairs can adversely affect the safety and reliability of the product and may
void the warranty. If you are not qualified to perform the repair of this product properly and safely, you
should not risk trying to do so and refer the repair to a qualified service technician.

WARNING
This product contains lead in solder and certain electrical parts contain chemicals which are known to the state of California to cause
cancer, birth defects or other reproductive harm.

Health & Safety Code Section 25249.6 – Proposition 65

NOTICE
(FOR CANADIAN MODEL ONLY)
Fuse symbols (fast operating fuse) and/or (slow operating fuse) on PCB indicate that replacement parts must
be of identical designation.

REMARQUE
(POUR MODÈLE CANADIEN SEULEMENT)
Les symboles de fusible (fusible de type rapide) et/ou (fusible de type lent) sur CCI indiquent que les pièces
de remplacement doivent avoir la même désignation.

(FOR USA MODEL ONLY)

1. SAFETY PRECAUTIONS

The following check should be performed for the
continued protection of the customer and service
technician.

LEAKAGE CURRENT CHECK

Measure leakage current to a known earth ground (water
pipe, conduit, etc.) by connecting a leakage current tester
such as Simpson Model 229-2 or equivalent between the
earth ground and all exposed metal parts of the appliance
(input/output terminals, screwheads, metal overlays, control
shaft, etc.). Plug the AC line cord of the appliance directly
into a 120V AC 60Hz outlet and turn the AC power switch
on. Any current measured must not exceed 0.5mA.

Reading should
not be above

0.5mA

Earth
ground

Device
under
test

Also test with
plug reversed
(Using AC adapter
plug as required)

Leakage
current
tester

Test all
exposed metal
surfaces

ANY MEASUREMENTS NOT WITHIN THE LIMITS
OUTLINED ABOVE ARE INDICATIVE OF A POTENTIAL
SHOCK HAZARD AND MUST BE CORRECTED BEFORE
RETURNING THE APPLIANCE TO THE CUSTOMER.

2. PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in the appliance
have special safety related characteristics. These are
often not evident from visual inspection nor the protection
afforded by them necessarily can be obtained by using
replacement components rated for voltage, wattage, etc.
Replacement parts which have these special safety
characteristics are identified in this Service Manual.
Electrical components having such features are identified
by marking with a
in this Service Manual.
The use of a substitute replacement component which does
not have the same safety characteristics as the PIONEER
recommended replacement one, shown in the parts list in
this Service Manual, may create shock, fire, or other hazards.
Product Safety is continuously under review and new
instructions are issued from time to time. For the latest
information, always consult the current PIONEER Service
Manual. A subscription to, or additional copies of, PIONEER
Service Manual may be obtained at a nominal charge from
PIONEER.

on the schematics and on the parts list

AC Leakage Test

2

2. EXPLODED VIEWS AND PARTS LIST

NOTES:• Parts marked by "NSP" are generally unavailable because they are not in our Master Spare Parts List.

2.1 PACKING

The mark found on some component parts indicates the importance of the safety factor of the part.

•

Therefore, when replacing, be sure to use parts of identical designation.

Screws adjacent to mark on the product are used for disassembly.

•

1

3

M-AX10

4

5

10

9

6

FRONT

7

11

2

(1) PACKING PARTS LIST

Mark No. Description Part No.

NSP 1 Literature Bag AHG-117

2 Instruction Manual (E) ARB7217
NSP 3 Warranty Card See Contrast table (2)
NSP 4 Warranty Card See Contrast table (2)

5 Styrol Protector L AHA9014

6 Styrol Protector R AHA9015

7 Packing Case See Contrast table (2)

8 Door Sheet AHG7064

9 Mirror Mat RHC1024

10 Polyester Bag VHL1004
11 Recycle Label See Contrast table (2)

8

(2) CONTRAST TABLE

M-AX10/KU/CA and M-AX10/NY are constructed the same except for the following:

Mark

No.

NSP 3 Warranty Card ARY7045 Not used
NSP 4 Warranty Card Not used ARY7022

7 Packing Case AHD7875 AHD7874

11 Recycle Label ARW7091 Not used

Symbol and Description

M-AX10/KU/CA M-AX10/NY

Part No.

Remarks

3

M-AX10

2.2 EXTERIOR

64

32

52

6

25

71

11

83

27
60

Take care to the edge

when sevicing

73

64

73

47

71

C

73

38

53

37

42

G

44

Refer to "2.4 FRONT PANEL"

46

52

71

77

71

49

39

90

68

39

39

39

73

34

34

67

73

39

67

78

26

88

24

16

70

62

70

62

62

62

70

A

62

70

N

O

B

B

P

Q

67

8

9

7

64

57

11

64

57

79

56

39

55

57

83

42

49

73

39

36

67
39

34

for NY type

37

45

16

85

40

G

21

33

30

10

62

50

67

39

57

19

62

70

35

D

3

75

73

73

77

32

44

49

73

52

36

39

25

71
71

F

73

61

45

61

45

20

Q

42

51

A

B

52

6

71

75

71

D

73

E

46

73

73

40

42

42

89

Refer to "2.3 REAR PANEL"

45

49

39

72

31

91

57

N

P

76

1

15

44

74

48

24

30

36

37

39

57

31

76

14

22

78

76

70

62

35

50

E

67

44

22

62

59

58

45

42

H

I

62

4

37

38

J

K

M

H

C

I

I

78

44

22

L

74

48

67

43

15

22

26

17

61

2

44

45

23

67

J

4

L

5

18

Take care to the edge

L

O

75

23

67

H

4

I

5
78

72

76

61

45

45

42

J

F

K

K

67

43

M

4

33

when servicing

54

44

44

28

29

68

80

68

4

45

65

44

69

80

44

29

65

73

47

82

12

for KU type

32

52

6

25

52

52

M-AX10

32

52

6

83

81

12

75

27
60

11

71

73

64

71

71

71

75

71

46

C

73

86

71

D

73

E

46

73

73

87

73

71
71

83

25

11

F

64

12

12

75

82

81

5

M-AX10

(1) EXTERIOR PARTS LIST

Mark No. Description Part No.

1 C.AMP (L) ASSY See Contrast table (2)
2 C.AMP (R) ASSY See Contrast table (2)
3 POWER SUPPLY ASSY See Contrast table (2)

4 Power MOS FET IRFP140

(Q1,Q2,Q5,Q6)

5 Power MOS FET IRFP9140

(Q3,Q4,Q7,Q8)

6 Electric Capacitor(C1-C4) ACH7156
7 Power Transformer See Contrast table (2)
8 Fuse (FU1) See Contrast table (2)

9 16P FFC 60V (J17) ADD7155
10 Wire with 2P Housing (J18) ADX7336

11 Cable (J9,J10) ADX7337
NSP 12 Cable (J23,J24) See Contrast table (2)

13 • • • • • • • • • •
14 PCB Holder (PLS) AEC7316
15 Plate AEE7030

16 Stay L (MET) ANA9006
17 Stay S (MET) ANA9007
18 Side Frame R ANA9008
19 Side Frame L ANA9009
20 Panel Stay (MET) AND7033

NSP 21 Bottom Plate ANF7012

22 PCB Holder ANG1474
23 Transistor Cover L ANG1724
24 L Type Plate ANG7248
25 Earth Plate ANG9102

NSP 26 Heat Sink (AL) ANH7105

27 Sub Inner Plate (MET) ANK7080
28 AC Code Cover (MET) ANK9024
29 Insulator ANL7012
30 Cord Clamper RNH-184

NSP 31 Spacer AEB7168
NSP 32 Spacer AEB7170
NSP 33 Damping Plate AMR7280
NSP 34 Damping Plate AMR7281

35 Cushion A PED1001

NSP 36 Sheet PED1006
NSP 37 Tape PNM-045
NSP 38 Tape PNM1160
NSP 39 Tape PNM1249
NSP 40 Washer (Plastic) RBF-085

41 • • • • • • • • • •
42 Screw ABA1011
43 Screw ABA1082
44 Screw (Steel) ABA1192
45 Screw (Steel) ABA1193

Mark No. Description Part No.

46 Screw (Steel) ABA1207
47 Screw (Steel) ABA7006
48 Screw (Steel) ABA7045
49 M4 SH Screw ABA7051
50 PCB Spacer (3 × 12) AEC1372

51 Washer (PVC) RBF1034
52 Screw VBA1056
53 Side AL L AAH7033
54 Side AL R AAH7034
55 Top Plate F (AL) AAH7035

56 Top Plate R (AL) AAH7036
57 Bonnet Escutcheon AAK7658
58 Rear Mole R AAP7056
59 Rear Mole L AAP7057
60 Innner Plate (MET) ANK7081

61 Screw BBT30P100FCC
62 Screw BBT30P080FCC
63 • • • • • • • • • •
64 Screw IBZ40P140FCC
65 Screw BBZ40P180FCC

66 • • • • • • • • • •
67 Screw IBZ30P060FCC
68 Screw IBZ30P080FCC
69 Screw IBZ40P080FCC
70 PCB Holder (MET) ANG9101

71 Screw PMZ40P060FCU
72 Screw VBZ35P080FMC
73 Washer (CU) WG40FCC
74 Washer WH30FUC
75 Binder ZCA-SKB90BK

76 Screw ABA1050
77 Screw IBZ40P080FCC
78 Screw ABA1208
79 Trans Shield ANK7074
80 Screw VCZ30P100FMC

81 Fuse (FU2,FU3) See Contrast table (2)
82 Fuse Holder See Contrast table (2)

83 Screw BBZ40P080FCC
84 UL Caution Card AAX-313

NSP 85 IPC Caution Label See Contrast table (2)
NSP 86 Fuse Card See Contrast table (2)

NSP 87 Fuse Card See Contrast table (2)
NSP 88 Micro Fuse Caution Card See Contrast table (2)

89 65 Label See Contrast table (2)

NSP 90 FCC Label See Contrast table (2)
NSP 91 Fuse Card See Contrast table (2)

Refer to next page about Contrast table (2).

6

(2) CONTRAST TABLE

M-AX10/KU/CA and M-AX10/NY are constructed the same except for the following:

M-AX10

Mark

No.

Symbol and Description

Part No.

M-AX10/KU/CA M-AX10/NY

1 C. AMP(L) ASSY AWX7673 AWX7280
2 C. AMP(R) ASSY AWX7674 AWX7281
3 POWER SUPPLY ASSY AWX7664 AWX7662
7 Power Transformer ATS7277 ATS7251
8 Fuse (FU1) VEK1029 REK-106

(10A) (4A)

NSP 12 Cable (J23,J24) ADX7335 Not used

81 Fuse (FU2,FU3) AEK7069 Not used

(20A)

82 Fuse Holder AKR7002 Not used
NSP 85 IPC Caution Label AAX7784 Not used
NSP 86 Fuse Card AAX7795 Not used

NSP 87 Fuse Card AAX7796 Not used
NSP 88 Micro Fuse Caution Label AAX7810 Not used

89 65 Label ARW7050 Not used
NSP 90 FCC Label VRW1559 Not used
NSP 91 Fuse Card Not used AAX1589

Remarks

7

M-AX10

2.3 REAR PANEL

3 or 4

G

26

I

27

13

14

33

22

20

35

46

B

A

30

27

E

32

31 31

36

34

E

G

19

11

F
H

46

40

21

29

8

7

28

43

13

44

28

8

37

8

10

28

42

47

24

41

16
38

28

38

28

6

8

7

37

32

17

38

15

24

11

C

H

38

9

18

18

A

18

38

B

38

D

C

D

38

9

28

39

18

10

26

25

A

G

22

F

5

30

23

45

26

27

H

K

1 or 2

32

21

25

26

27

40

8

REAR PANEL PARTS LIST

(1)

Mark No. Description Part No.

1 V.AMP (L) ASSY AWX7278
2 V.AMP (R) ASSY AWX7279
3 INPUT (L) ASSY AWX7273

NSP 5 JOINT ASSY AWX7283

10 AC Cord with Plug See contrast tabel (2)

4 INPUT (R) ASSY AWX7274

6 Ground Terminal AKE-046
7 Speaker Terminal 1P AKE7009

(CN1,CN2,CN5,CN6)

8 Speaker Terminal 1P AKE7010

(CN3,CN4,CN7,CN8)

9 23P FFC 60V (J5,J6) ADD7154

11 11P Housing Wire (J3,J4) ADX7278
12 • • • • • • • • • •
13 Connector Assy (J7) PG10MM-F15
14 Connector Assy (J8) PG10MM2F15
15 Rear Panel (MET) ANC7820

16 Rear Panel Plate R See contrast tabel (2)
17 Rear Panel Plate L See contrast tabel (2)
18 PCB Holder (MET) ANG9101
19 Shield Plate(PLS) ANK7076
20 AC Shield L ANK9025

M-AX10

NSP 22 Spacer AEB7169
NSP 23 Tape AEH7008
NSP 24 Damping Plate AMR7278
NSP 25 Damping Plate AMR7281

NSP 26 Tape PNM1249

NSP 33 PCB Spacer (14) DEC1387

NSP 46 Earth Lead Wire DE025BF0

21 Shield Cover ANK9026

27 Fiber Washer RBF1045
28 Screw ABA1192
29 Screw BBT30P100FCC
30 Screw ABA1207

31 Rivet AEC-441
32 Nylon Rivet AEC7242

34 Card Spacer DEC1772
35 PC Support VEC1549

36 Cushion A PED1001
37 Screw BBZ30P080FCC
38 Screw IBZ30P060FCC
39 Nut NK70FCU
40 Binder ZCA-SKB90BK

41 Input Plate (MET) ANG7274
42 Locking Card Spacer VEC1596
43 Ferrite Core See contrast tabel (2
44 Screw ABA1011
45 AC Shield Case (PLS) ANK7075

47 AC Cord Spacer ANG1153

(2) CONTRAST TABLE

M-AX10/KU/CA and M-AX10/NY are constructed the same except for the following:

Mark

No.

Symbol and Description

M-AX10/KU/CA M-AX10/NY

10 AC Cord with Plug ADG7041 ADG7038

16 Rear Panel Plate R ANC7288 ANC7285

17 Rear Panel Plate L ANC7289 ANC7286

43 Ferrite Core Not used ATX1031

Part No.

Remarks

9

M-AX10

2.4 FRONT PANEL

40

36

35

34

42

14

46

17

11

44

23

26

18

15

38(2/3)

20

C

38(1/3)

24

10

19

42

49

44

25

16

1

21

32

22

44

12

47

43

6

43

7

44

44

5

41

3

39

31

13

D

44

44

27

29

41

12

47

9

49

10

42

E

4

8

27

29

10

30

44

28

44

43

33

48

44

45

44

38(3/3)

F

2

42

37

FRONT PANEL PARTS LIST

•

Mark No. Description Part No.

NSP 1 SW ASSY AWX7282
NSP 2 VR ASSY AWX7334

NSP 4 LED ASSY AWX7277
NSP 5 Cord with Plug ADH7022

3 FRONT ASSY AWX7276

M-AX10

NSP 6 Cord with Plug (J20) DE005VF0

NSP 13 Spacer AEB7169
NSP 14 Damping Plate AMR7282
NSP 15 Tape PNM1249

NSP 16 Cushion A REB1060
NSP 17 Cushion B REB1061

7 Magnet AMF7003
8 Door Hinji L (PLS) AMR9199
9 Door Hinji R (PLS) AMR9200

10 Door Assy (MET) ANG9100
11 Inner Panel (AL) ANB7184

12 Damper Assy AXA9013

18 LED Lens AAK2459
19 LED Filter S(PLS) AAK7657
20 LED Film (PLS) AAK7669

21 Display Panel L (PLS) AAK9044
22 Cover AAK9045
23 LED Filter L (PLS) AAK9046
24 Mode Panel (PLS) AAK9047
25 Mode Lens (PLS) AAK9048

26 Panel S (PLS) AAK9049
27 Door Cushion AED9014
28 Tape AEH7009
29 Door Yoke (MET) ANB7187
30 Name Plate G (AL) PAN1377

31 Cushion A PED1001
32 Knob S (PLS) AAB7200
33 Knob M (AL) AAB7201
34 Block ANL7015
35 Power Button (ABS) VNK4159

36 Side Panel L (AL) AAH7037
37 Side Panel R (AL) AAH7038
38 Panel Base (PLS) AMB9020
39 Door Panel (AL) ANB7182
40 Front Panel (AL) ANB7183

41 Screw BBT30P080FCC
42 Screw BBZ30P080FCC
43 Screw IBZ30P060FCC
44 Screw IBZ30P080FCC
45 Nut NK90FCU

46 Screw PMH30P060FMC
47 Screw PSZ20P060FMC
48 Screw (STEEL) ABA1050
49 Washer (PLS) ABF7007

11

1

23

M-AX10

3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM

3.1 OVERALL CONNECTION DIAGRAM AND JOINT ASSY

4

A

E

LED ASSY (AWX7277)

FRONT ASSY

D

(AWX7276)

F

VR ASSY
(AWX7334)

B

POWER SUPPLY ASSY

KU/CA : (AWX7664)
NY : (AWX7662)

B

L712 RTF1167

R712 2.2

I

C.AMP(L) ASSY

KU/CA : (AWX7673)
NY : (AWX7280)

C

L711

RTF1167

G

H

V.AMP(L) ASSY
(AWX7278)

D

INPUT(L) ASSY
(AWX7273)

12

A

1234

5

C

SW ASSY
(AWX7282)

678

M-AX10

Note : When ordering service parts, be sure to refer to "EXPLODED VIEWS
and P AR TS LIST" or "PCB PAR TS LIST".

A

B

From
AC Power Cord

A

JOINT ASSY
(AWX7283)

J

INPUT(R) ASSY
(AWX7274)

L

C.AMP(R) ASSY

KU/CA : (AWX7674)
NY : (AWX7281)

C

K

V.AMP(R) ASSY
(AWX7279)

D

A

5

6

7

8

13

A

1

23

M-AX10

3.2 POWER SUPPLY, SW ASSY

4

B

POWER SUPPLY ASSY
(KU/CX :AWX7664 ,NY :AWX7662)

C1, C3

J805

and

J801

CN803

6
5
4
3

1

J803

I

CN501

PIOWER TRANSFORMER

120V(KU/CA)
230V (/NY)

B

6

5
1

22
4

3

C2, C4

and

K

CN601

C

J802
J804

J808

J806

C

SW ASSY

(AWX7282)

CN701

D

CN853

CN852

CN851

FU1

FU1
KU :VEK1029(10A)
NY :REK-106(4A)

14

B C

1234

5

678

M-AX10

A

CN711

CN805

A

CN804

D

CN901

B

+24V

+24V

C

CN806

• NOTE FOR FUSE REPLACEMENT

CAUTION -

5

FOR CONTINUED PROTECTION AGAINST RISK OF FIRE.
REPLACE WITH SAME TYPE AND RATINGS ONLY.

6

A

CN712

D

B

7

8

15

1

M-AX10

3.3 FRONT, LED, VR ASSY

A

CN901

B

CN804

B

23

4

C

E

LED ASSY
(AWX7277)

D

16

CN751

J902

CN761

J901

VR ASSY

F

(AWX7334)

D E F

1234

5

678

M-AX10

FRONT ASSY

D

(AWX7276)

SWITCHES

S901 : ATT THROUGH
S902 : ATT HOLD
S903 : INPUT
S904 : ILLUMINATION
S905 : MODE

A

B

C

D

D

5

6

7

8

17

1

M-AX10

3.4 INPUT (L), INPUT (R) ASSY

A

INPUT(L) ASSY

G

(AWX7273)

B

23

12dB FLAT AMP

4

JA101

C

JA102

D

18

G

1234

5

678

M-AX10

J201

K

CN401

A

JA201

JA202

INPUT(R) ASSY

J

(AWX7274)

CN201

A

CN714

SIGNAL ROUTE

: AUDIO SIGNAL

B

DAC VR

J101

CN101

H

CN301

A

CN713

C

D

G

5

6

7

J

8

19

1

M-AX10

3.5 V.AMP (L) ,V.AMP (R) ASSY

A

B

23

V. AMP(L) ASSY

H

(AWX7278)

4

14dB POWER AMP

J101

C

G

DC ADJ(HL)

CN301

CN302

A

CN715

DC ADJ(LL)

D

20

H

1234

5

678

M-AX10

SIGNAL ROUTE

: AUDIO SIGNAL

J401

A

J301

L

CN607

J302

I

CN507

I

CN508

I

CN502

J

J201

CN401

CN402

J402

V. AMP(R) ASSY

(AWX7279)

K

L

CN608

B

L

CN602

CN403

C

A

CN303

J306

5

6

CN716

7

H

K

8

D

21

1

M-AX10

3.6 C.AMP (L), C.AMP (R) ASSY

A

CN505

B

23

C. AMP(L) ASSY

I

(KU/CA : AWX7673)
( NY : AWX7280)

CURRENT AMP

4

CN507

H

J301

CN508

H

J302

CN502

IDLE ADJ(HL)

C

H

CN303

IDLE ADJ(LL)

D

22

I

1234

5

R

To C2,C4

R

678

R

R

R

R

M-AX10

CN605

C. AMP(R) ASSY

L

(KU/CA : AWX7674)
( NY : AWX7281)

CN607

R

K

J401

CN601

CN608

R

R

K

R

J402

CN602

R

CN603

R

R

K

CN604

R

CN403

R

R

SIGNAL ROUTE

: AUDIO SIGNAL

A

B

CN501

J513

J514

J501

J512

J511

To C1,C3

C

D

I

5

6

7

L

8

23

1

23

M-AX10

4. PCB CONNECTION DIAGRAM

4

A

NOTE FOR PCB DIAGRAMS :

1. Part numbers in PCB diagrams match those in the schematic
diagrams.

2. A comparison between the main parts of PCB and schematic
diagrams is shown below.

Symbol In PCB
Diagrams

BCE

BCE

D

B

3. The parts mounted on this PCB include all necessary parts for
several destinations.
For further information for respective destinations, be sure to
check with the schematic diagram.

4. View point of PCB diagrams.

Symbol In Schematic
Diagrams

BCEBCE

BCE

DGGSS

BCE

DGS

Part Name

Transistor

Transistor
with resistor

Field effect
transistor

Resistor array

3-terminal
regulator

B

CN806

J

CN201

K

CN402

4.1 JOINT, SW, LED, VR ASSY

A

JOINT ASSY

SIDE A

B

CN805

G

CN101

H

CN302

C

D

Connector

P.C.Board

(ANP7281-A)

C

Capacitor

Chip Part

SW ASSY

SIDE A

SIDE B

D

J902

E

LED ASSY

D

J901

F

(ANP7281-A)

VR ASSY

24

B

CN852

1234

(ANP7282-C)

(ANP7281-A)

1

234

M-AX10

A

SIDE B

A

JOINT ASSY

B

(ANP7281-A)

(ANP7281-A)

C

E

LED ASSY

C

SW ASSY

F

VR ASSY

D

(ANP7281-A)

(ANP7282-C)

25

1

2

3

4

1

M-AX10

4.2 POWER SUPPLY ASSY

B

POWER SUPPLY ASSY

SIDE A

A

B

23

4

L

CN601

AC POWER

CODE

TRANSFORMER

C

D

CN901

POWER

C

CN701

A

CN712

POWER
TRANSFORMER

A

CN711

D

26

Q812
Q810
Q811
Q809

1234

Q808
Q806
Q807
Q805

Q804 IC801
Q802
Q803
Q801

IC802
IC804

IC805
IC803

I

CN501

(ANP7282-C)

1

234

M-AX10

B

POWER SUPPLY ASSY

SIDE B

A

B

(ANP7282-C)

1

C

D

Q816Q821
Q814
Q815
Q813

2

Q818

Q820

Q817

Q819

27

3

4

1

M-AX10

4.3 FRONT ASSY

A

B

SIDE A

B

CN804

23

D

FRONT ASSY

4

F

CN761

E

CN751

C

D

28

(ANP7282-C)

Q935

IC902

IC903

Q943

Q946

Q947

Q949
Q945

Q942
IC901

1234

Q904 Q901
Q903

Q918
Q902
Q952

Q934

IC904

Q932
Q933

1

234

M-AX10

D

FRONT ASSY

SIDE B

A

B

(ANP7282-C)

1

Q916
Q915
Q917

Q919
Q926

2

Q928 Q930
Q951

Q907

Q914

C

D

Q950
Q948

29

3

4

1

M-AX10

4.4 INPUT(L) ASSY

G

A

B

INPUT(L) ASSY

23

4

SIDE A

H

CN301

A

CN713

G

INPUT(L) ASSY

Q101

Q106

Q107

Q110

Q111

Q114

IC101 IC102 Q119 Q120

Q129–Q131

(ANP7281-A)

SIDE B

C

D

Q116 Q117
Q115

30

1234

Q126–Q128

Q118

1

4.5 INPUT(R) ASSY

SIDE A

K

CN401

234

M-AX10

J

INPUT(R) ASSY

A

B

(ANP7281-A)

SIDE B

Q229–Q231

CN714

A

IC201IC202Q219Q220

Q211

Q214

Q207

Q210

Q201

Q206

J

INPUT(R) ASSY

C

1

Q226–Q228

Q218

Q216Q217
Q215

D

31

2

3

4

1

M-AX10

4.6 V. AMP(L) ASSY

23

4

A

B

I

CN508

I

CN502

I

CN507

H

V. AMP(L) ASSY

Q321

Q324

VR301 VR302

Q309

Q316

Q305

Q308

Q301

Q304

Q333
Q334

SIDE A

A

CN715

G

J101

(ANP7294-C)

H

SIDE B

V. AMP(L) ASSY

C

D

32

Q341

Q344

1234

Q325

Q328

Q329Q332Q331
Q336
Q335

Q337 Q340
Q338

1

4.7 V. AMP(R) ASSY

234

M-AX10

SIDE A

A

CN716

J

J201

(ANP7294-C)

Q433
Q434

Q401

Q404

Q405

Q408

VR401VR402

Q409

Q416

Q421

Q424

K

V. AMP(R) ASSY

L

CN608

L

CN602

L

CN607

A

B

SIDE B

K

V. AMP(R) ASSY

C

D

Q437Q440
Q438

1

Q429 Q432 Q431
Q436
Q435

2

Q425

Q428

Q441

Q444

33

3

4

1

M-AX10

4.8 C. AMP(L) ASSY

I

C. AMP(L) ASSY

23

4

A

VR502, VR501

Q515

Q513

H

CN303

SIDE A

B

H H

J302 J301

I

C. AMP(L) ASSY

C

(ANP7294-C)

Q502, Q501

Q520, Q519

SIDE B

Q504, Q506, Q508, Q510

Q518

D

Q512, Q511, Q517

34

Q507, Q509, Q505, Q503

1234

1

4.9 C. AMP(R) ASSY

234

M-AX10

L

C. AMP(R) ASSY

Q615
Q613

SIDE A

VR602, VR601

A

K

CN403

B

(ANP7294-C)

Q601, Q602

Q619, Q620

SIDE B

Q608, Q610, Q606, Q604

Q618

Q617, Q611, Q612

K K

J401 J402

L

C. AMP(R) ASSY

C

D

Q603, Q605, Q607, Q609

1

35

2

3

4

M-AX10

Mark No. Description Part No.

5. PCB PARTS LIST

NOTES:•Parts marked by "NSP" are generally unavailable because they are not in our Master Spare Parts List.

The mark found on some component parts indicates the importance of the safety factor of the part.

•

Therefore, when replacing, be sure to use parts of identical designation.
When ordering resistors, first convert resistance values into code form as shown in the following examples.

•

Ex.1 When there are 2 effective digits (any digit apart from 0), such as 560 ohm and 47k ohm (tolerance is shown by J=5%,
and K=10%).

560 Ω→56 × 10
47k Ω→47 × 10

0.5 Ω→R50 ..................................................................................... RN2H R 5 0 K

1 Ω→1R0 ..................................................................................... RS1P

Ex.2 When there are 3 effective digits (such as in high precision metal film resistors).

5.62k Ω→ 562 × 10

1

→ 561 ........................................................RD1/4PU 5 6 1 J

3

→ 473 ........................................................RD1/4PU 4 7 3 J

1

→ 5621 ......................................................RN1/4PC 5 6 2 1 F

Mark No. Description Part No.

1 R 0

CONTRAST OF PCB ASSEMBLIES

Mark Symbol and Description

M-AX10 /KU/CA M-AX10 /NY

NSP POWER AMP ASSY AWH7003 AWH7002

V. AMP (L) ASSY AWX7278 AWX7278
V. AMP (R) ASSY AWX7279 AWX7279
C. AMP (L) ASSY AWX7673 AWX7280
C. AMP (R) ASSY AWX7674 AWX7281

NSP AF COMPLEX (A) ASSY AWM7410 AWM7410

INPUT (L) ASSY AWX7273 AWX7273

INPUT (R) ASSY AWX7274 AWX7274
NSP SW ASSY AWX7282 AWX7282
NSP JOINT ASSY AWX7283 AWX7283
NSP VR ASSY AWX7334 AWX7334

Part No.

K

Remarks

NSP AF COMPLEX (B) ASSY AWM7507 AWM7506

POWER SUPPLY ASSY AWX7664 AWX7662

FRONT ASSY AWX7276 AWX7276
NSP LED ASSY AWX7277 AWX7277

C.AMP (L) ASSY

I

AWX7673and AWX7680 are constructed the same except for the following:

Mark

C.AMP (R) ASSY

L

Symbol & Description

IC501,IC502 AEK7022 Not used IC Protector (10A/125V)

AWX7673

Part No.

AWX7680

AWX7674and AWX7681 are constructed the same except for the following:

Mark

POWER SUPPLY ASSY

B

Symbol & Description

IC601,IC602 AEK7022 Not used IC Protector (10A/125V)

AWX7674

Part No.

AWX7681

AWX7664and AWX7662 are constructed the same except for the following:

Mark

Symbol & Description

R849 -R852 Not used RS2LMF222J

AWX7664

Part No.

AWX7662

Remarks

Remarks

Remarks

36

M-AX10

Mark No. Description Part No.

JOINT ASSY

A

COILS AND FILTERS

L711,L712 RTF1167

CAPACITORS

C711,C712 CEAT100M50

RESISTORS

Other Resistors RS1/10S J

OTHERS

CN711,CN712 10P MT CONNECTOR 1-173981-0
CN713,CN714 11P PLUG KM200TA11
711,712 PCB BINDER VEF1040

POWER SUPPLY ASSY (AWX7664)

B

SEMICONDUCTORS

IC803 AEK7019
IC801,IC802 AEK7021
IC804,IC805 BA178M24T
Q815,Q816,Q819,Q820 2SA1255
Q803,Q804,Q811,Q812 2SA1837

Q805,Q806 2SA970
Q807,Q808 2SC2240

Q813,Q814,Q817,Q818 2SC3138
Q801,Q802,Q809,Q810 2SC4793

D801-D804 F10KF20
D805-D812,D833-D837 S5566G(TPB2)

D838 UDZS10B

Q821 2SC2712

D821-D828 1SS355

D829-D832 UDZ16B
D813-D816,D841-D844 UDZ24B

D817-D820 UDZ36B

COILS AND FILTERS

L801,L802 RTF1167

Mark No. Description Part No.

R819-R822 RS1/10S301J
R836-R838 RS1/10S3R3J
R805-R808 RS1LMF103J

Other Resistors RS1/10S J

OTHERS

CN805,CN806 10P MT CONNECTOR 1-173981-0
CN804 16P CONNECTOR 9604S-16C

H851,H852 FUSE CLIP AKR1004
CN851 AC CODE SOCKET RKP1751
CN852 AMP U-P CONNECTOR RKP1833

CN853 AMP U-P CONNECTOR RKP1834

SW ASSY

811-822 HEAT SINK ANH7100

805 PCB BINDER VEF1040

KN801-KN803 EARTH METAL FITTING VNF1084

C

SWITCHES AND RELAYS

S701 ASG-553

CAPACITORS

C701 (0.01µF/250V) ACE7014

OTHERS

CN701 AMP U-P CONNECTOR RKP1833

D

FRONT ASSY

SEMICONDUCTORS

IC902 BA178M05T
IC903 BA178M15T

IC904 AT24C01-10PC

IC901 PD5508B9

Q952 2SA1048

Q903,Q904 2SC2458

Q901,Q902 2SC2705

Q943,Q946 2SJ146

Q907-Q914,Q942,Q945 DTA124EK

Q918 DTA143EK

CAPACITORS

C851 (0.01µF/250V) ACE7014

C803,C804,C833 CEANP1R0M50
C829-C832,C836 CEAT100M50
C813-C820 CEAT100M63
C809-C812 CEAT471M2A

C821-C824 CEATR10M2A
C838,C840 CEHAT100M50
C839,C841 CEHAZA220M25
C825-C828 CEHAZL101M50
C834 CEHAZL182M35

C837 CEHAZL331M35
C805-C808 CEHAZL471M50
C842 CFTYA224J50
C801,C802 CKCYF103Z50

RESISTORS

R803,R804 RD1/4LMF470J

R813,R814 RD1/4MUF124J
R831,R839 RS1/10S100J
R815-R818 RS1/10S101J

Q915-Q917,Q919,Q926,Q928 DTC124EK
Q930,Q947-Q951 DTC124EK
Q932-Q935 DTC124ES
D933-D935,D953 1SS355
D927 DAN202K

D936 DAP202K
D901-D914 NSCW100-8511
D929-D932 SLP6118C51H
D951,D952 UDZS7.5B

COILS AND FILTERS

X901 (4.19MHz) VSS1014

SWITCHES AND RELAYS

S905 ASD7014
S901-S904 VSG1009

CAPACITORS

C921,C922,C942 CEHAZA220M25
C961,C963,C964 CEHAZA470M6R3
C941,C955,C957 CEJA100M35
C953 CEJA2R2M50

37

M-AX10

Mark No. Description Part No.

C927,C954 CKSQYF103Z50
C901-C914,C923-C926 CKSQYF104Z50
C931-C934,C951,C956 CKSQYF104Z50

RESISTORS

Other Resistors RS1/10S J

OTHERS

902 3P CABLE HOLDER 51048-0300
901 7P CABLE HOLDER 51048-0700
CN901 16P CONNECTOR 52492-1620
J902 3P JUMP WIRE D20PDY0310E
J901 7P JUMP WIRE D20PDY0715G

E

LED ASSY

SEMICONDUCTORS

D752-D754 NSCW100-8511

RESISTORS

All Resistors RS1/10S J

OTHERS

CN751 3P JUMPER CONNECTOR 52151-0310

F

VR ASSY

SEMICONDUCTORS

IC761 TC74HC86AP
Q761,Q762 2SK1132

SWITCHES AND RELAYS

S761 ASX7028

CAPACITORS

C761 CEAT100M50
C762 CKSQYF104Z50

Mark No. Description Part No.

COILS AND FILTERS

L101 RTF1167

SWITCHES AND RELAYS

RY101-RY103 VSR1008

CAPACITORS

C101,C102,C105-C108 (220pF) ACE7012
C140 (47µF) ACH7116
C103,C104 CCCSL560K2H
C135 CCSQCH100D50
C132-C134 CCSQCH101J50

C128 CCSQCH470J50
C129,C130 CEAT100M50
C121,C122 CEHAZA101M25
C131 CEHAZA220M25
C125,C126 CEHAZL471M25

C115-C118 CEHAZL471M50
C119,C120,C123,C124 CFTYA104J50
C109,C110 CQHA561J2A
C141,C142 (22µF) RCH1077
C111-C114 (47µF/10V) RCH1139

C127 (100µF/6.3V) VCH1156

RESISTORS

R137,R138 RDR1/4VM1001F
R135,R136,R166 RDR1/4VM2400F
R139,R140 RDR1/4VM3001F
R101,R102 RDR1/4VM391J
R103,R104 RDR1/4VM473J

R157,R158 RS1/10S1002F
Other Resistors RS1/10S J

OTHERS

J101 6P HOUSING SHIELD WIRE ADX7253
JA101,JA102 PIN JACK(1P) AKB7102
CN101 11P SOCKET KP200TA11L

RESISTORS

All Resistors RS1/10S J

OTHERS

CN761 7P JUMPER CONNECTOR 52147-0710

G

INPUT (L) ASSY

SEMICONDUCTORS

IC101 DAC8043FP
IC102 OP275GP
Q101,Q102 2SA1048

Q120 2SA1145

Q119 2SC2705

38

Q107,Q108,Q113,Q114 2SA1145

Q103-Q106 2SA970
Q109-Q112 2SC2705

Q123,Q124,Q129-Q131 2SK1132
Q115,Q117,Q126-Q128 DTA124EK

Q116,Q118 DTC124EK
D101-D112 1SS355
D113,D114 UDZ18B
D115 UDZS5.1B

V. AMP (L) ASSY

H

SEMICONDUCTORS

Q325,Q326,Q341,Q342 2SA1162
Q309,Q310 2SA1929
Q301,Q302,Q307,Q308 2SA970
Q313,Q314,Q323,Q324 2SA970
Q303-Q306,Q315,Q316 2SC2240

Q321,Q322 2SC2240
Q327,Q328,Q343,Q344 2SC2712
Q329,Q331,Q332 2SC3326
Q311,Q312 2SC5170
Q333,Q334,Q339 2SK1132

Q335-Q337,Q340 DTA124EK
Q338 DTC124EK
D307,D313-D316 1SS355
D309-D312 UDZS7.5B

SWITCHES AND RELAYS

RY301,RY302 VSR1008

CAPACITORS

C303,C304,C333-C336 (220pF) ACE7012
C313,C314 (10µF) ACH7124
C301,C302,C319 (10µF) ACH7125

M-AX10

Mark No. Description Part No.

C305-C308,C323-C326 CCSQCH270J50

C311,C312 CEAT470M25

C315-C318 CEGA471M50

C309,C310 CEHAZA470M10

C331 CFTYA683J50

C337,C338 CSZSR100M16

RESISTORS

R303,R304 RDM1/2P221J

R345 RDM1/2P3600F

R343,R344 RDM1/2P7500F

R341,R342 RDM1P3001F

R379,R380 RDR1/4PM470J

R301,R302 RDR1/4VM104J
R349-R352 RS1/10S101J

R315 RS1/10S1001D

R314 RS1/10S1101D

R386 RS1/10S30R0D

R385 RS1/10S33R0D

R313,R316,R325-R328 RS1/10S3900D

R347,R348 RS1/10S5100D

VR301,VR302 (220Ω) ACP7002

Other Resistors RS1/10S J

OTHERS

CN303 23P CONNECTOR 9604S-23C

J301 2WIRE SHIELD HOUSING ADX7258

J302 2WIRE SHIELD HOUSING ADX7259

KN301 EARTH METAL FITTING VNF1084

I

C. AMP (L) ASSY (AWX7673)

SEMICONDUCTORS

IC501,IC502 IC PROTECTOR(10A) AEK7022
Q503,Q504 2SA1162

Q517,Q518 2SC3138

Q507-Q510 2SC2712

Q513,Q515 2SK1132

Q511,Q512 DTA124EK

Q505,Q506 DTC143EK

Q501,Q502,Q519,Q520 IMX1

D501,D502 1SS355

D503,D504 BR3371XJ30A

COILS AND FILTERS

L501 RTF1167

SWITCHES AND RELAYS

RY501,RY502 ASR1035

CAPACITORS

C505,C506 CEANP470M10

C507 CEAT100M50

C508 CEHAZA220M25

C511,C512 CEHAZL471M50

C501-C504 CFTYA224J50

Mark No. Description Part No.

R503,R504 RS1/10S6801F

R509-R512,R531-R534 RS2LMFR22J

R521,R522,R537,R538 RS1/10S8201F
R513,R514 RS3LMF2R2J

VR501,VR502 (4.7KΩ) ACP7003
Other Resistors RS1/10S J

OTHERS

CN502 23P CONECTOR 9604S-23C
CN507,CN508 2P TOP POST B2B-EH
501 PCB BINDER VEF1040
KN501,KN502 EARTH METAL FITTING VNF1084

J

INPUT (R) ASSY

SEMICONDUCTORS

IC201 DAC8043FP
IC202 OP275GP
Q201,Q202 2SA1048

Q220 2SA1145

Q219 2SC2705

Q207,Q208,Q213,Q214 2SA1145

Q203-Q206 2SA970
Q209-Q212 2SC2705

Q223,Q224,Q229-Q231 2SK1132
Q215,Q217,Q226-Q228 DTA124EK

Q216,Q218 DTC124EK
D201-D212 1SS355
D213,D214 UDZ18B
D215 UDZS5.1B

COILS AND FILTERS

L201 RTF1167

SWITCHES AND RELAYS

RY201-RY203 VSR1008

CAPACITORS

C201,C202,C205-C208 (220pF) ACE7012
C240 (47µF) ACH7116
C203,C204 CCCSL560K2H
C235 CCSQCH100D50
C232-C234 CCSQCH101J50

C228 CCSQCH470J50
C229,C230 CEAT100M50
C221,C222 CEHAZA101M25
C231 CEHAZA220M25
C225,C226 CEHAZL471M25

C215-C218 CEHAZL471M50
C219,C220,C223,C224 CFTYA104J50
C209,C210 CQHA561J2A
C241,C242 (22µF) RCH1077
C211-C214 (47µF/10V) RCH1139

C227 (100µF/6.3V) VCH1156

C509 CFTYA474J50

C517,C518 CKSQYF104Z50

C515,C516 (47µF/10V) RCH1139

RESISTORS

R519,R520,R535,R536 RS1/10S1502F

R501,R502 RS1/10S1602F

RESISTORS

R237,R238 RDR1/4VM1001F
R235,R236,R266 RDR1/4VM2400F
R239,R240 RDR1/4VM3001F
R201,R202 RDR1/4VM391J
R203,R204 RDR1/4VM473J

39

M-AX10

Mark No. Description Part No.

R257,R258 RS1/10S1002F
Other Resistors RS1/10S J

OTHERS

J201 6P HOUSING SHIELD WIRE ADX7253
JA201,JA202 PIN JACK(1P) AKB7102
CN201 11P SOCKET KP200TA11L

K

V. AMP (R) ASSY

SEMICONDUCTORS

Q425,Q426,Q441,Q442 2SA1162
Q409,Q410 2SA1929
Q401,Q402,Q407,Q408 2SA970
Q413,Q414,Q423,Q424 2SA970
Q403-Q406,Q415,Q416 2SC2240

Q421,Q422 2SC2240
Q427,Q428,Q443,Q444 2SC2712
Q429,Q431,Q432 2SC3326
Q411,Q412 2SC5170
Q433,Q434,Q439 2SK1132

Q435-Q437,Q440 DTA124EK
Q438 DTC124EK
D407,D413-D416 1SS355
D409-D412 UDZS7.5B

SWITCHES AND RELAYS

RY401,RY402 VSR1008

CAPACITORS

C403,C404,C433-C436 (220pF) ACE7012
C413,C414 (10µF) ACH7124
C401,C402,C419 (10µF) ACH7125
C405-C408,C423-C426 CCSQCH270J50
C411,C412 CEAT470M25

C415-C418 CEGA471M50
C409,C410 CEHAZA470M10
C431 CFTYA683J50
C437,C438 CSZSR100M16

RESISTORS

R403,R404 RDM1/2P221J
R445 RDM1/2P3600F
R443,R444 RDM1/2P7500F
R441,R442 RDM1P3001F
R479,R480 RDR1/4PM470J

R401,R402 RDR1/4VM104J

R449-R452 RS1/10S101J

R415 RS1/10S1001D
R414 RS1/10S1101D

R486 RS1/10S30R0D

Mark No. Description Part No.

L

C. AMP (R) ASSY (AWX7674)
SEMICONDUCTORS

IC601,IC602 IC PROTECTOR(10A) AEK7022
Q603,Q604 2SA1162

Q617,Q618 2SC3138

Q607-Q610 2SC2712
Q613,Q615 2SK1132
Q611,Q612 DTA124EK

Q605,Q606 DTC143EK
Q601,Q602,Q619,Q620 IMX1
D601,D602 1SS355
D603,D604 BR3371XJ30A

COILS AND FILTERS

L601 RTF1167

SWITCHES AND RELAYS

RY601,RY602 ASR1035

CAPACITORS

C605,C606 CEANP470M10
C607 CEAT100M50
C608 CEHAZA220M25
C611,C612 CEHAZL471M50
C601-C604 CFTYA224J50

C609 CFTYA474J50
C617,C618 CKSQYF104Z50
C615,C616 (47µF/10V) RCH1139

RESISTORS

R619,R620,R635,R636 RS1/10S1502F
R601,R602 RS1/10S1602F
R603,R604 RS1/10S6801F

R609-R612,R631-R634 RS2LMFR22J

R621,R622,R637,R638 RS1/10S8201F

R613,R614 RS3LMF2R2J
VR601,VR602 (4.7kΩ) ACP7003
Other Resistors RS1/10S J

OTHERS

CN602 23P CONNECTOR 9604S-23C
CN607,CN608 2P TOP POST B2B-EH
601 PCB BINDER VEF1040
KN601,KN602 EARTH METAL FITTING VNF1084

R485 RS1/10S33R0D
R413,R416,R425-R428 RS1/10S3900D
R447,R448 RS1/10S5100D
VR401,VR402 (220Ω) ACP7002
Other Resistors RS1/10S J

OTHERS

CN403 23P CONNECTOR 9604S-23C
J401 2WIRE SHIELD HOUSING ADX7258
J402 2WIRE SHIELD HOUSING ADX7259
KN401 EARTH METAL FITTING VNF1084

40

6. ADJUSTMENT

Table 6-3 DC offset adjustment method

Channel

Adjustment

Point

Measurement Point

Adjustment

Value

L High ch VR301

Apply channel speaker

terminals (Red, Black)

0V ± 10mV

L Low ch VR302

R High ch VR401

R Low ch VR402

M-AX10

6.1 IDLE CURRENT ADJUSTMENT

The idle current is adjusted in two steps: coarse and fine. Note that
the adjustment value for fine adjustment depends on the elapsed
time from the coarse adjustment.
For the points to be adjusted or measured, see Table 6-1 and Fig. 6-

1.
For the adjustment timing and values, see Table 6-2.
Be sure to turn VR501, VR502, VR601 and VR602 fully counter­clockwise before turning the power on.

Table 6-1 Adjustment points of idle current

Channel L High ch L Low ch R High ch R Low ch

Adjustment

point

Measurement

point

Table 6-2 Adjustment values of idle current

Coarse

Adjustment

Fine

Adjustment

VR501 VR502 VR601 VR602

CN505 CN505 CN605 CN605

Between

pins 1 and 2

Adjustment Timing

Power ON immediately 14.5mV ± 1.0mV

Elapsed

time from

the coarse

adjustment

Between

pins 3 and 4

More than 5 min.

and less than

10 min.

More than 10 min.

and less than

15 min.

More than 15 min.

and less than

30 min.

More than 30 min.

pins 1 and 2

Between

Adjustment value

(Pin voltage)

16.0mV ± 0.5mV

15.5mV ± 0.5mV

15.0mV ± 0.5mV

14.5mV ± 0.5mV

Between

pins 3 and 4

6.2 DC OFFSET ADJUSTMENT

Adjust the DC offset with the power on immediately before fine
adjustment of the idle current.
For the points to be adjusted or measured, and the adjustment values,
see Table 6-3 and Fig. 6-1.

6.3 OPERATION CHECK OF THE
PROTECTION CIRCUIT

While supplying a sine wave of 1 Hz, 1.2 Vrms in DUAL MODE,
with ATT.THROUGH OFF, increase the volume level and check
that the protection circuit activates before the level reaches the
maximum value. It works about before twelve o'clock position.

CAUTION : This check mode may damage the speaker(s) when it
is connected to the output terminal. It is recommended
that output terminal is open at this check mode.

VR302
L Low ch
DC OFFSET ADJ

VR301
L High ch
DC OFFSET ADJ

VR502
L Low ch
Idle Current ADJ

VR501
L High ch
Idle Current ADJ

CN505

Rear Side

Front Side

Fig. 6-1 Adjustment and measurement points

CN605

VR402
R Low ch
DC OFFSET ADJ

VR401
R High ch
DC OFFSET ADJ

VR602
R Low ch
Idle Current ADJ

VR601
R High ch
Idle Current ADJ

41

M-AX10

7. GENERAL INFORMATION

7.1 IC

• The information shown in the list is basic information and may not correspond exactly to that shown in the schematic diagrams.

List of IC

•

PD5508B9, DAC8043FP

PD5508B9 (FRONT ASSY : IC901)

• Control Microcomputer

Pin Function

•

No. Mark Pin Name I/O Pin Function

1 P53 VR2 I
2 P17/Srdy/A10 LD O
3 P16/CLK/A9 CLK O
4 P15/Sout/A8 SRD O
5 P14/Sin/A7 IND. IN1 O
6 P13/T1/A6 IND. IN2 O
7 P12/T0/A5 IND. SEPA O
8 P11/A4 IND.BRD O
9 P10 IND. DUAL O

10 P27/IN7 IND. ATT.THROUGH O

P26/IN6

11
12 P25/IN5 INPUT2 O
13 P24/IN4 DACVR O
14 P23/IN3/A3 SEPARATE O
15 P22/IN2/A2 INVERT O
16 P21/IN1/A1 SPRYH O
17 P20/IN0/A0 SPRYG O
18 Vref/CE Vref ­19 Xin Xin I
20 Xout Xout O
21 Vss Vss ­22 Vcc Vcc ­23 P50/Xcin VR4 I
24 P51/Xcout VR5 I
25 RESET RESET I
26 P30/INT0/A11 BACKUP I
27 P31/INT1/A12 BRD. I
28 P32/CNTR0/OE DAL. I
29 P33/CNTR1/Vpp VR1 I
30 P40/A13 SEPA I
31 P41/A14 FMT O
32 P42 ILL2 O
33 P43 ILL1 O
34 P00/D0 SDA I/O
35 P01/D1 SCL O
36 P02/D2 MD WKUP I
37 P03/D3 ATT. THROUGH I
38 P04/D4 ATT. HOLD I
39 P05/D5 INPUT I
40 P06/D6 ILL. I
41 P07/D7 P-DET I
42 P52 VR3 I

IND. ATT. HOLD

Serial I/O pins

Timer output

O

Analog input

Reference voltage input
Clock input
Clock output
Power supply voltage input
Power supply voltage input

Reset input
External inrerrupt input

Timer input

Key ON wake-up function

42

M-AX10

Following item "1."~"7." (P.43~P.51) describe about the specifications
of IC901 PD5508B9.

SPECIFICATIONS

1. Basics

1.1 Reset

Perform the reset when connecting the AC power supply.

RESET

RAM set complete flag of EEPROM readout data

[ f_eeprom_rd_set ] = 0

AC check (Voltage of ACSUB)

Register initialize

RAM initialize

EEPROM readout

BACKUP

check OK ?

N

RAM clear for memory communication

Y

1.2 BACKUP Mode

Backup is performed when the AC power is turned off.

SPRYH (port 16) and SPRYG (port 17) are set to "L" 10 ms after
the BACKUP port becomes "L."
All the indicators and lamps go dark.
Execution of the BACKUP processes (port processing and register
processing) begins 30 ms later.
Last memory writing to the EEPROM is performed each time a key
is operated, but not performed in the backup processes.

Port processing

1) I/O ports are specified as output ports.

2) Output ports are set to "L."

Backup targets

INPUT1/2, ATT.THROUGH, ATT. HOLD (The level value is also
backed up when ON), ILL.
(The VOLUME level and mode settings at the mechanical switch
are checked each time the power is turned on.)

BRD. DUAL

ILL
INPUT
ATT. THR
ATT. HOLD

ATT. LEVEL

Bright / dark / off
1/2

ON/OFF

As writing to ROM may require 40 ms at maximum, 5 V will be
supplied to the microcomputer for about 100 ms after the AC power
is turned off at the hardware.

The data to be written are composed of the following 3 bytes:

PRO.

ON/OFF

At ATT. HOLD
ON only

Flag for the power ON [ f_power ] = 1
Flag for initializing [ f_i nit ] = 1

Timer [ tminit ] = 50 msec set

RETURN

Fig. Flow chart of RESET

(IC901
Internal Port)

Perform reading from the EEPROM while RAM is being initialized
after the AC power is turned on (port 25 (Pin25) (RESET): L).
Set the read data to RAM using "initcont" after resetting is completed.
(See "2. Initializing.(P.44)")

1 Bit 0

Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7

2

3

ILL1 ON/OFF
ILL2 ON/OFF
INPUT 1/2
ATT. THROUGH ON/OFF
ATT. HOLD ON/OFF
SEPARATE ON/OFF
DUAL ON/OFF
BRIDGE ON/OFF

VOLUME position (5 bit)
* At ATT. HOLD ON only

BACKUP code

Communication is made using ports 34 (SDA) and 35 (SCL) as
output ports.

IC901 PD5508B9

43

M-AX10

1.3 Last Memory

Last memory writing to the EEPROM (IC904:AT24C01-10OC) is
performed each time a key is operated.
Input-independent last memory is not provided.
The ILL and ATT.THROUGH settings remain the same in switching
between INPUT 1 and 2.

1.4 TEST Mode

None

1.5 SILENT Mode

The unit can enter SILENT mode in a condition other than the
following:

• The BACKUP port is "L." (BACKUP mode)

• A volume operation is being processed.

• A key input is being processed.

• Caution status for mode switching (caution indication state at the
operation of OPERATION MODE SW during Power-On state)

When 200 ms have elapsed after such a process is completed, the
unit can enter SILENT mode.

The unit restarts upon key input, a volume operation, mode switching,
or P-DET input.
The timer is set for 5-second restarting.
When 200 ms have elapsed after the restarting process is completed,
the unit can enter SILENT mode again.

(SILENT mode : The control µ-com enter the low power consump­ tion mode and stops the oscillation of system clock.)

(normal operation mode)

(2) POWER OFF

Port 16 (SPRYH)(Pin16) is set to "L" 10 ms after POWER OFF
(port 26 (BACKUP)(Pin26) becomes "L").

Ports that must be processed other than port 16 are operated
immediately after this.

26 (BACKUP)

16 (SPRYH)

10 msec

2. Initializing

The main routine starts after reset processing.
Normal processing starts after the initializing process is completed
with "initcont".

The data read during the reset processing are written to RAM.
(See the "1. Basics"(P.43).)
If the MODE switch was not operated during the POWER OFF
period, the read data are written to RAM.
If the MODE switch was operated during the POWER OFF period,
the default settings are made.

Default: INPUT1

ATT.THROUGH OFF
ATT.HOLD OFF
ILL Bright

1.6 POWER ON/OFF

(1) POWER ON

After POWER ON, port 16 (SPRYH)(Pin16) is set to "L" and port
31 (FMT)(Pin31) is set to "H."
Port 31 (FMT) is set to "L" after 3 seconds, and muting is set to
OFF.
After another 5 seconds (8 seconds after POWER ON), ports 16
(SPRYH) and 17 (SPRYG)(Pin17) are set to "H," and relay is set to
ON.

Power ON

16 (SPRYH)

31 (FMT)

3 sec 5 sec

Then the timers are set.
Refer to the next page Fig.1.

IC901 PD5508B9

44

Reset

M-AX10

AC check

Register initial setting
RAM initial setting

when EEPROM read
out is OK.

RAM initial setting
when EEPROM read
out is NG.

Timer [tminit]

INITCONT processing

Relay
Timer [tmprot]

MUTE
Timer [tmmute]

200 msec

1

2

3

4

50 msec

5

INITCONT start

6

ACTION start

#

3 sec

$

8 sec

INPUT SW set

LED lights processing

ATT. through SW set

MODE SW set

ILL. lights processing

DAC VOL transfer
processing
At ATT. through ON

At ATT. through OFF

Tact key accept start

Timer [tmdcerr]

Silent mode

7

8

100 msec

9

0

-

40 msec

~

2 sec

=

!

5 sec

@

Fig.1 Timing chart of initializing process from the reset

200 msec

%

45

M-AX10

3. Key Input (IC901)

36 (MD WKUP)

IC901

Microcomputer

37 (ATT.THROUGH)
38 (ATT.HOLD)
39 (INPUT)
40 (ILL)

IC901 PD5508B9

SW1 SW2

Key input, indicators and processes

Key Input
Port

37
(ATT. THROUGH)

39
(INPUT)

38
(ATT. HOLD)

40
(ILL)

ACT

L

L

L

Indicator
Process Port

10
(IND ATT. THROUGH)

5 (IND IN1)
6 (IND IN2)

11 (IND ATT. HOLD)

None

SW3 SW4 SW5

Contents of Process

DUAL BRIDGE

Alternates "H" and "L"
alternately at each key
input.

Sets INDIN1 and INDIN2 to
"H" and "L" alternately at
each key input.

Key disabled. Always "L". Key disabled. Always "L". Alternates "H" and "L" at

Alternates "H" and "L"
alternately at each key
input.

Sets INDIN1 and INDIN2
to "H" and "L" alternately
at each key input.

SEPARATE

Alternates "H" and "L"
alternately at each key
input.
Key disabled with
ATT.HOLD ON.

Key disabled.
Both INDIN1 and INDIN2
always lit ("H").

each key input.
Key disabled with ATT.
THROUGH ON.

Key Input
Port

37
(ATT. THROUGH)

39
(INPUT)

38
(ATT. HOLD)

40
(ILL)

46

ACT

L

L

L

L

Indicator
Process Port

13 (DAC VR)

12 (INPUT2)

32 (ILL2)
33 (ILL1)

Contents of Process

DUAL BRIDGE

ON : "H"
OFF : "L"

INPUT1 : "L"
INPUT2 : "H"

Key disabled. Key disabled.

Cycles Bright/Dark/Off at each key input.
(ILL1, ILL2) Bright (H, L)

Dark (L, H)
Lamp Off (H, H)
LED Off (L, L)

Factory setting: Bright (H, L)

ON : "H"
OFF : "L"

INPUT1 : "L"
INPUT2 : "H"

SEPARATE

ON : "H" (VOL invalid)
OFF : "L" (VOL valid)
Key disabled with ATT.
HOLD ON.

Fixed at L.

ON : HOLD data valid

VOL invalid
OFF : VOL valid
Key disabled with ATT.
THROUGH ON.

M-AX10

3.1 Key Inputs

A key input becomes valid after 40 ms, to eliminate chatter.
The ATT.THROUGH key input from OFF to ON becomes valid
when the key is held pressed for 2 seconds.

3.2 Switch inputs

The MODE switch (rotary switch) setting is read when the power is
turned on.
The switch operation with POWER ON is invalid.
(See "7. WARNING."(P.50))

4. KEY PROCESSING (IC901)

4.1 ATT.THROUGH Switching

The ATT.THROUGH key input from ON to OFF becomes valid
when the key is held pressed for 2 seconds.
Any other key input during these 2 seconds is invalid.
When switching from OFF to ON, the key input becomes valid at
normal timing.

Key input valid

Port 16 (SPRYH)(Pin16) is set to "L" 10 ms after ATT.THROUGH
switching signal input, and relay is set to OFF.
After another 30 ms, the INDICATOR port is processed.
Port 31 (FMT)(Pin31) is set to "H," and muting is set to ON.
Switching process is performed 100 ms after ATT.THROUGH
switching signal input.

When switching ATT THROUGH from ON to OFF:

Data transfer to the DAC IC is performed 2 seconds after the key
input.

When switching ATT.THROUGH from OFF to ON:

Port 2 (LD), port 3 (CLK), and port 4 (SRD) are fixed to "L" before
DACVR (pin 13) is set to "L," 30 ms after relay becomes OFF.
(See "6. DAC Volume Transfer."(P.49))

After another 2 seconds, port 31 (FMT)(Pin31) is set to "L," and
muting is set to OFF.
After another 3 seconds, port 16 (SPRYH)(Pin16) is set to "H," and
relay becomes OFF.

EEPROM writing

Relay

Mute

LED ON/OFF
processing

Switching

VOL. processing
(ON → OFF)

VOL. data line processing
(OFF → ON)

Silent processing

1

2

10 msec

4

6

7

100 msec

9

40 msec

5

40 msec

2 sec

8

2 sec

3

5 sec

Fig.2 Timing chart when ATT. through key is pressed

200 msec

0

47

M-AX10

4.2 INPUT switching

INDICATOR port processing and switching process start 30 ms
after INPUT key input [port 39 (INPUT)(Pin39): "L"].
No muting process is performed.

INPUT key is pressed.

EEPROM writing

1

LED processing

40 msec

2

Switching processing

40 msec

3

Silent processing

4

Fig.3 Timing chart when INPUT key is pressed

4.3 ATT.HOLD Key Processing

Upon ATT.HOLD key input, the specified current volume value
is held.
While ATT.HOLD is ON, the volume level stays at the held value
even if the volume control is operated.
In Muting mode (when the power is turned on or ATT.
THROUGH is switched from ON to OFF), the ATT.HOLD key is
disabled.

4.4 ILL Key Processing

Each press of the key cycles Bright, Dark, Lamp Off, and LED
Off.

ILL key is pressed

1

Port processing

2

SILENT processing

3

Fig.5 Timing chart when ILL key is pressed

4.5 VOL Key Processing

VOL operation

VOL input valid

typ. 15 msec

1

Data transfer
to DAC

typ. 16 msec

2
3

ATT. HOLD key is pressed.

EEPROM writing
(OFF → ON)

EEPROM writing
(ON → OFF)

VOL. transfer
(ON → OFF)

LED processing

HOLD processing
(OFF → ON)

SILENT
(OFF → ON)

typ. 8 msec

1

typ. 1 msec

2

typ. 10 msec

3

typ. 0 msec

4

5

6

SILENT
(ON → OFF)

6’

Fig.4 Timing chart when ATT. HOLD key is pressed

SILENT processing

Fig.6 Timing chart when volume is input

4.6 Invalid Key Input

An invalid key is pressed.

SILENT processing

Fig.7 Timing chart when an invalid key is pressed

4

1

5 sec

5 sec

48

5. Mode Switching Processing (IC901)

Select the mode of the speakers using the MODE switch (rotary
switch).
Any of three modes (BRIDGE, DUAL and SEPARATE) can be
selected.

Table Mode select indicator processing

Mode
Input Port

27
(BRIDGE)

28
(DUAL)

30
(SEPA.)

Table Mode select port processing

Mode
Input Port

27
(BRIDGE)

28
(DUAL)

30
(SEPA.)

ACT

L

L

L

Indicator
Process Port

8 (IND BRD.)

9 (IND DUAL)

7 (IND SEPA.)

Contents of Process

Sets to "H".

Sets to "H".

Sets to "H".

ACT

12 (INPUT2)

INPUT1 : "L" ATT. through : "L"

L

INPUT2 : "H"
INPUT1 : "L" ATT. through : "L"

L

INPUT2 : "H"
Fixed at "L"

L

13 (DACVR) 14 (SEPARATE) 15 (INVERT) 16 (SPRYH) 17 (SPRYG)

ATT. exist : "H" ATT. exist : "H"

ATT. exist : "H" ATT. exist : "L"
ATT. through : "L"

ATT. exist : "H" ATT. exist : "L"

Contents of Process

Process Port

IC901 PD5508B9

"L" "H" "L"

"L" "H" "L"

"H" "H" "L"

ATT. through : "H"

ATT. through : "L"

ATT. through : "L"

M-AX10

The MODE switch is disabled while power is ON.
(See "7. WARNING.")

6. DAC Volume Transfer (IC901)

When the status of port 29 (VR1) changes, port 29 (VR1), port 30
(VR2), port 42 (VR3), port 23 (VR4), and port 24 (VR5) are
checked to detect the VOLUME position.
With DUAL, BRIDGE, or SEPARATE, the attenuation volume is
read from the VOLUME position/ATT volume table and
transferred to the DAC IC in Serial mode (MSB first).

When the transfer is completed, LD (port 2) is set to "L" then
returned to "H."

When ATT.THROUGH is ON or port 13 (ATT.THROUGH) is
"L," port 2 (LD), port 3 (CLK), and port 4 (SRD) are fixed at "L."
Then the data are transferred again when port 13 (
is set to "H."

When switching ATT.THROUGH from ON to OFF or when
turning power ON:

Data transfer is performed 2 seconds after the switch is operated.

Switching

DACVR (pin 13)

ATT.THROUGH

When switching ATT THROUGH from OFF to ON or when
turning the power ON:

Port 2 (LD), port 3 (CLK), and port 4 (SRD) are fixed at "L"
before DACVR (pin 13) is set to "L," 30 ms after relay becomes
OFF.

Relay

Three data lines
"L"

)

DACVR (pin 13)

Data transfer is performed once in the following conditions and
terminated:

• When the power is turned on

• When the VOL is operated

• When ATT.THROUGH is switched from ON to OFF

• When ATT.HOLD is switched from ON to OFF

Data transfer

2 sec

49

M-AX10

Position

31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10

9
8
7
6
5
4
3
2
1

Binary

Code

00000
00001
00010
00011
00100
00101
00110
00111
01000
01001
01010
01011
01100
01101
01110
01111
10000
10001
10010
10011
10100
10101
10110
10111
11000
11001
11010
11011
11100
11101
11110

BRIDGE / DUAL

Attenuation (dB) Serial Data

0

-2

-4

-6

-8

-10

-12

-14

-16

-18

-20

-22

-24

-26

-28

-30

-32

-34

-36

-38

-40

-42

-44

-46

-48

-50

-52

-54

-56

-58

Infinity

FFF

CB4

A17

804
65E
50E

404

331

289

203

199

145

102

CD

A3
81
66
51
40
33
28
20
19
14
10

C

A
8
6
5
0

-2.0021

-4.0026

-6.0015

-8.0013

-10.0064

-12.0052

-14.0006

-16.0002

-18.0089

-20.0106

-22.0074

-24.0127

-26.0100

-28.0013

-30.0333

-32.0731

-34.0754

-36.1215

-38.0937

-40.2039

-42.1421

-44.2863

-46.2245

-48.1627

-50.6615

-52.2451

-54.1833

-56.6821

-58.2657
#NUM!

PROCESSOR

Attenuation (dB) Serial Data

0.0

-0.5

-1.0

-1.5

-2.0

-2.5

-3.0

-3.5

-4.0

-4.5

-5.0

-5.5

-6.0

-6.5

-7.0

-7.5

-8.0

-8.5

-9.0

-9.5

-10.0

-10.5

-11.0

-11.5

-12.0

-12.5

-13.0

-13.5

-14.0

-14.5

-15.0

FFF

F19

E41
D75
CB4
BFE

B53
AB0

A17

987
8FE
87D

804

791

725
6BE

65E

603
5AC

55B

50E
4C6

482

441

404
3CB

394

361

331

303
2D8

-0.5021

-1.0016

-1.5013

-2.0021

-2.5023

-3.0001

-3.5028

-4.0026

-4.5008

-5.0030

-5.5039

-6.0015

-6.5025

-7.0008

-7.5043

-8.0013

-8.5003

-9.0057

-9.5043

-10.0064

-10.5037

-11.0010

-11.5045

-12.0052

-12.5007

-13.0072

-13.5048

-14.0006

-14.5040

-15.0025

7. WARNING

7.1 Protection

When abnormal amplifier output is detected, the protection relay
and function muting are controlled to warn the user.

When P-DET (port 41) becomes "L," FMT (port 31) is set to "H"
and port 16 (SPRYH) is set to "L" immediately.

At the same time, ILL indicators flash in 1-second cycle.
(ILL1, ILL2) = (H, L) ↔ (L, L) (ILL1=port33(Pin33)
Flashing : Mode illumination light ILL2=port32(Pin32))
Mode indicator
Panel light
When the POWER OFF key is pressed, POWER OFF processing is
performed. (All other keys are disabled.)

Refer to 7.2 PROTECTION CIRCUIT about the circuit explanation.

7.2 Mode Switching

Mode switching is allowed only when the power is OFF.

If mode switching is performed with the power ON, relay is set to
OFF. When the previous status is restored, relay is returned to ON.

As a caution, the LED of the selected mode and the LED of the
operating mode flash with the timing shown below.
When the MODE switch is returned to its original setting, the LED
flashing as a caution stops, and normal status is resumed.

The MODE switch is read every loop.

When the MODE switch is operated when the ILL indicator is dark,
the indicator is forcibly turned on.
When the MODE switch setting matches the operating mode setting,
the ILL mode resumes its original status.

Relay is set to OFF in the MODE CAUTION status.

Indicator of the
operating mode

Indicator after
the switch is
operated

0.5
sec

1.0 sec

ON
OFF

ON
OFF

50

M-AX10

Switching

Acknowledgment
of switching

[f_mderr_rq]
Flag for Mode error
LED Warning

ILL lights if it is off
Mode error LED

warning
Key disabled

Relay

ILL processing

Silent mode

Fig.8 Timing of mode switching error processing

Switching
(restoring the original setting)

20 msec 20 msec

10 msec

200 msec

7.3 Warning when switching ATT.THROUGH from
OFF to ON

When ATT.THROUGH is switched from OFF to ON, the key
becomes valid when it is held pressed for 2 seconds.
The ATT.THROUGH ON/OFF LED flashes during those 2 seconds.

IC901 PD5508B9

DAC8043FP (INPUT(L) ASSY : IC101, INPUT(R) ASSY : IC201)

• D/A Converter IC

Pin Assignment (Top View)

•

V

REF

1

R

FB

2
3

I

OUT

4

GND

Block Diagram

•

V

REF

CLK

SRI

LD

5

V

DD

6

CLK

7

SRI

8

LD

2

R

1

12-BIT

D/A CONVERTER

FB

3

12

5

12-BIT

DAC REGISTER

8

12

7
6

12-BIT INPUT

SHIFT REGISTER

4

R

FB

I

OUT

V

DD

GND

51

M-AX10

7.2 PROTECTION CIRCUIT

The protection circuits are provided for this unit. When these protection
circuits are activated ,the hardware muting is activated and muting and the
output relays are controlled by the microcomputer.

There are two protection circuits.

1) DC voltage detection at the output

2) Overcurrent detection due to the short circuit at the load end

1. DC voltage detection circuit

At the High-CH (Low-CH) output current amp of C.AMP (L)ASSY,
DC voltage is detected by Q507 and Q509 (Q508 and Q510) and these
transistors turned ON and P-DET signal becomes Low. When P-DET
signal becomes Low ,relay control Tr. Q515 ,Q511 and Q512 becomes
open and shut down the relay RY501 and RY502. Also microcomputer
receive P-DET Low signal and activate the mute circuit and set OFF the
relay control Tr. Q513.

2. Overcurrent detection circuit

At the High-CH (Low-CH) output current amp of C.AMP (L)ASSY,
(+) side overcurrent is detected by Q503 and Q505 (Q518,Q504 and
Q506) and these transistors turned ON and P-DET signal becomes Low.
Following is same as above.
(–) side overcurrent is detected by Q517,Q503 and Q505 (Q504 and
Q506) and these transistors turned ON and P-DET signal becomes Low.
Following is same as above.

Refer to next page FIg.1 about the circuit description.

3. Starting condition of the protection circuit

The above protection circuits works under the following condition.

DC voltage detection : about over ± 3V
Overrcurrent detection : about over 14~15A

52

M-AX10

+23V

DC VOLTAGE DETECTION CIRCUIT

P-DET

OVERCURRENT DETECTION CIRCUIT

+HOUT L

[H – CH L]

–HOUT L

+LOUT L

[L – CH L]

–LOUT L

DC VOLTAGE DETECTION CIRCUIT

Fig.1 PROTECTION CIRCUITS

OVERCURRENT DETECTION CIRCUIT

P-DET

SPRYH

To

U-com IC901

(KU/CA : AWX7673)

( NY : AWX7280)

C.AMP (L) ASSY

53

M-AX10

7.3 DESCRIPTIONS

7.3.1 Product Overview
Features of this product

Three-mode drive power amplifiers

This product is equipped with power amplifiers for two right and
two left channels (total of 4 channels).
Three types of speaker drive formats can be selected.

1. SEPARATE mode

The product functions as a 4-channel power amplifier (115 watts, 4
ohms for each of 4 channels). By connecting to a 2-way channel
divider, a high-grade multi-amplifier system can be established.
Using two units of this product provides a Hi-Fi surround system
for up to 8 channels. The product can also be used for DVD multi­channel audio, DOLBY DIGITAL, and DTS applications.

2. DUAL mode

By connecting speakers that conform to tandem-wiring use, a Bi­amplifier (tandem amplifier) system can be established. By driving
tweeters and woofers separately with different amplifiers,
interference between speaker units is virtually eliminated. Thus,
super hi-fi stereo playback with a high degree of purity is enabled.

3. BRIDGE mode

The product functions as bridge-output high-power amplifiers (230
watts, 6 ohms for each of 2 channels).

Symmetrical twin-stereo structure

High-performance stereo amplifiers are symmetrically mounted left
and right.
Of course in SEPARATE or DUAL mode, enlargement of a large
current loop can be eliminated even in BRIDGE mode, restraining
sound degradation due to magnetic coupling, which is a disadvantage
of bridge amplifiers. The important parts are isolated by shield plates
and shield cases to achieve excellent channel separation at high
frequencies (104 dB or more at 20 kHz between the left and right
channels). You can enjoy high-grade stereophonic playback in a
rich sound field.

Advanced direct-energy MOSFET power
amplifiers

This product employs MOSFETs of larger capacity than with
conventional models. For insulation between each large heat sink
and MOSFET, a quite small zero-resistance ceramic sheet is
employed to improve the radiation characteristics. Not only a rise
in temperature with continuous signal input, but also instantaneous
rises in temperature with pulse-type input can be minimized.
For higher sound quality, the response speed to an input of large
sound volume and the clarity are highly improved.
In addition, a newly developed Z (ZETT) BIAS circuit that precisely
reproduces the thermal factors of a MOSFET is mounted for
temperature compensation for the idle current. This drastically
improves the drift of the idle current which may greatly affect sound
quality, and enables playback at constantly stable sound quality
immediately after you turn on the power.

Wide-range linear circuit

The wide range linear circuit has been enhanced to improve DC
stability by newly employing highly accurate parts of 0.5% error
and single-chip dual transistors for a completely discrete structure
that uses no DC servo or operational amplifier.
This enables natural and clear playback of low frequencies by
keeping NFB stable from very low frequencies.

DAC (Digital Accurate Control) attenuator

A high-precision 12-bit D/A converter of ladder resistance type is
used.
Advantages of the DAC attenuator (when compared with
conventional mechanical sliding-type controls)

1. Excellent S/N in practical usage

2. The frequency response is not affected by the attenuation volume
setting.

3. The attenuation volume can be programmed. This product
provides two curves, for high-frequency attenuation in a multi­amplifier system and for normal volume control.

4. No tracking error (gain error between channels)

5. No signal irregularity from vibration, providing pure sound

6. The operation block and the circuit block can be separated. The
signal path length can be minimized by free layout.

Large-sized super ring toroidal transformer

A large-sized super ring toroidal transformer of 450 VA is employed
for the lowest possible loss and lowest impedance at the power block.
In addition, repression of power harmonics, which has been regarded
as impossible with large-capacity toroidal transformer, has been
achieved, enabling powerful and smooth playback at high speeds.

Silent control microcomputer

When the knobs and buttons are not operated, the control
microcomputer enters Low-Power-Consumption mode (system clock
oscillation stops). This decreases power consumption, and eliminates
high-frequency interference caused by clock oscillation to maintain
high sound quality. In addition, the microcomputer continuously
monitors the amplifier status and if it detects an abnormality, it
immediately activates the protection circuit. By using the
microcomputer in combination with the conventional hardware­protection circuit, higher reliability and safety are ensured.

Ultra-Low-Impedance Power Circuit

Power de-coupling by an ultra-low-impedance condenser, ample
jumper lines and a No. 16 wire power cable are employed for very
low impedance in the power and ground lines.
In the low frequency range, channel separation is greatly improved
(achieving 115 dB at 20 Hz) by decreasing ground common
impedance.
In the high frequency range, the rise in impedance due to the
inductance component is suppressed, for higher frequency stability.
Thus a power amplifier that is virtually impervious to changes in
speaker impedance and connection cables has been created.

54

7.3.2 Circuit Description

Block Diagram

BRIDGE

37.1V(200W)/6Ω20V(100W)/4Ω

OUTPUT VOLTAGE

DUAL

SEPARATE

Red

Low ch

Blk

Bridge

Blk

High ch

Red

10A(/KU/CA)

4A (/NY)

±30V Power Amp Current Stage

(Full-wave voltage doubler rectifier)

M-AX10

AC IN

~–

+~

14dB POWER AMP

12dB FLAT AMP

+

–

MUTE

+

–

24V

LED

24V

RY

15V

LED

LED

AC

5V

Microcomputer

Protection circuit

detection

±40V Power Amp Current

MUTE

+

–

Vref

Iout

Microcomputer

Stage FLAT AMP

±18V Op Amp IC

+5V

for Lch

(for Rch same as L ch)

DAC IC

LOCAL

CIRCUT

ON/OFF

+

–

+

–

INDICATOR

ATT

CONTROL

FUNC MUTE

MODE RY

INPUT RY

PROTECTION RY

Input 2

(Low ch)

Microcomputer

Silent

microcomputer

1V/50kΩ

Input 1

(High ch)

Interruption

ATT DATA input

µ-COM

KEY input

MODE SW

Protection circuit

Backup

detection

AC ON/OFF information

BACK UP RESET

EEPROM

55

M-AX10

Each mode of block diagram

IN 2

IN 1

IN 2

IN 1

12dB

+

12dB

+

12dB

+

12dB

+

DAC VR

– Dual Drive Mode –

14dB

+

14dB

+

14dB

+

14dB

–

RED

BLK

RED

BLK

RED

BLK

RED

BLK

Low ch

High ch

Full
Range

Low ch

High ch

12dB

+

12dB

+

DAC VR

– Bridge Drive Mode –

14dB

14dB

DAC VR

– Separate Drive Mode –

+

+

RED

Low ch

BLK

RED

High ch

BLK

56

Descriptions of the Block Diagram

1. INPUT switching block

Four small-signal relays for individual channels are used for input
signal switching.

2. 12-dB flat amplifier block

The input signal is amplified by 12 dB (4 times) to increase the
input level at the DAC attenuator block to improve the dynamic
range and signal-to-noise ratio.
In DUAL or BRIDGE mode, the flat amplifier on the low-channel
side is shut down by the LOCAL CIRCUIT OFF circuit.
The circuits are mounted in a shielded box to completely eliminate
electrostatic and magnetic coupling.

3. DAC attenuator block

Attenuator section

This is a digitally controlled high-precision analog attenuator that
uses a ladder resistance block of R-2R-type DAC ICs for volume
control. The signal is input to the Vref (reference-voltage) terminal
and the attenuated signal current is obtained from the Iout (current­output) terminal. The signal at this terminal is converted to a voltage
signal by an I-V converter of the operational amplifier. An output
signal of the same phase as the input signal is obtained through
inversion by the operational amplifier. The attenuation volume
adjustment is controlled using serial data from the microcomputer.

M-AX10

5. Protection circuit

When a DC voltage at the output end or a short circuit at the load
end is detected, hardware muting is activated and muting and output
relays are controlled by the microcomputer.
When a short circuit at the load end is detected, a resistance inserted
between the MOSFET drain power sources is used (for current
detection) in place of a bridge detection circuit, a device greatly
affected by the phase difference between the output power voltage
and current.
Thus, possible malfunction of the protection circuit in practical use
is prevented.

6. Power block

A large (450-VA) Super Ring is employed for the transformer.
The second coils are separated into three coil windings for left
channel, right channel, and a subcircuit.
For the power amplifier, a full-wave voltage doubler rectifier system
is used to suppress high-frequency current.
For the voltage amplifier, a half-wave voltage doubler rectifier
system is used to obtain the specified voltage without using additional
coils. Each signal stage has a local stabilized power source, and the
lamps are driven at a constant current for low power consumption.

Control section

A 5-bit (31-position) digital rotary switch is used. The rotation angle
and information can be sent to the microcomputer, enabling the silent
function (Low-Power-Consumption mode) of the microcomputer.

Two DAC ICs are used for two individual channels. There is no
mechanical contact, resulting in fewer errors in attenuation volume
and gang errors within 0.1 dB at any position. The attenuation volume
can be flexibly adjusted by the microcomputer software.
With this product, it can be set in 2-dB steps (up to -58 dB) in
BRIDGE mode and in 0.5 dB steps (up to -15 dB) in SEPARATE
mode. When this product is used in combination with a preamplifier,
you can bypass the DAC attenuator block using the ATT.THROUGH
function. For this bypass switching, the same small-signal relay as
with the INPUT switching clock is used.

4. 14-dB power amplifier block

Pioneer's original "Direct-Energy MOSFET Amplifier" and "Wide­Range Linear Circuits" are mounted. The circuits function as the
inversion/noninversion switching amplifier on the high-channel side
and as an inversion amplifier in BRIDGE mode.
This eliminates the necessity for an inversion amplifier otherwise
essential for a bridge amplifier.

Level Diagram

Input 1, 2
Input high, low

40dBV

(100Vrms)

30dBV

permission input level

20dBV

(10Vrms)

10dBV

0dBV

(1Vrms)

with attenuator

1Vrms

12dB

Input Buffer

Amp.

Maximum

(4Vrms)

14dB Dual, Separate

ATT through

ATT ON

0dB (-58dB MIN)

DAC VR

4Vrms, 12dBV

20dB Bridge

Speaker Out

Power

Amp.

40Vrms, 32dBV

Bridge

20Vrms, 26dBV

Dual Separate

-10dBV

57

M-AX10

9. PANEL FACILITIES AND SPECIFICATIONS

FRONT SECTION

1

1 POWER

Press to switch the appliance on and off.

2 OPERATION MODE

Use this to switch between the three modes:
bridge,dual and separate. Be sure to turn the
power off before switching between modes.
Switching with the power on will activate the
warning circuit. The mode illumination light
and mode indicator will flash, and the output
will be muted.
If it happens, you should turn the operation
mode switch back to its original position.
The flashing will stop, and your M-AX10 will
return to normal.

3 ATT HOLD

This button is activated only if the OPERATION
MODE switch is pointing to SEPARATE.

Press the ATT HOLD (attenuator hold) button
while in separate mode allows whatever atten­uation has been set with the ATTENUATOR
knob to be retained.
Pressing it again will cancel the operation.
Note,however, that it is not possible to turn
ATT HOLD on and off while the output is muted
(eight seconds after switching the power on).

0

-

8

32

4

~

9=

4 ATT THROUGH

BEWARE: If this button is used ,the volume
will be herted at maximum level.

Pressing the ATT THROUGH button for two
seconds or longer causes the sound to be
output through the speakers without passing
through the attenuator circuit. However, because
the mute circuit is activated, thereis no sound
for five seconds after the button is depressed.
The sound will emerge from the speakers
five seconds after the ATT THROUGH button
is pressed. Note that it will be maximaum volume.
Pressing the button again will cancel the operation.

5 ILLUMINATION

Pressing the ILLUMINATION button once, twice or
three times alters the brightness of the panel light,
mode indicator as indicated below.
Pressing it a fourth time will return the lights to
their initial settings.

initial
setting

Press
once

657

Panel
light

Bright On On

Dim On On

Mode

illumination

light

Mode

indicator

58

Press
twice

Press
three
times

Off On On

Off Off Off

M-AX10

6 INPUT

This button allows you to switch between INPUT 1 and
INPUT 2. Note,however,that this is not possible if the
the OPERATION MODE switch is set to SEPARATE.

7 ATTENUATOR

This Knob allows you to adjust the attenuation in 31
stages.In dual and bridge modes it functions as a volume
control : 0 dB when turned full right, and - ∞ when turned
full left. In Separate mode it functions as an attenuator
for adjusting the volume of the high-frequncy channel
(0 to -15 dB,in 0.5 dB steps): turning it to the left lowers
the volume.

8 MODE ILLUMINATION LIGHT

The lamp display changes as illustrated below depending
on whether the OPERATION MODE switch is set to
BRIDEGE, DUAL or SEPARATE. Switching operations
modes while the power is on will activate the warning
circuit and cause the mode illumination light to flash.

Bridge mode

9 MODE INDICATOR

The lettering lights up to show whether the OPERATION
MODE switch is pointing to BRIDGE, DUAL ,SEPARATE.
Switching operation modes while the power is on will
activate the warning circuit and cause the mode indicator
to flash.

0 ATT THROUGH INDICATOR

This indicator lights up when ATT THROUGH is ON.

- ATT HOLD INDICATOR

This indicator lights up when ATT HOLD is ON.

= INPUT INDICATORS

These indicators light up to show whether INPUT 1 or
INPUT 2 has been selected. They both light up in Sepa­rate mode.

~ PANEL LIGHT

This illuminates the display panel.

METHODS OF CONNECTION

The M-AX10 has four built-in amplifier channels, which can
be connected by means of three different operation modes:
BRIDGE ,DUAL and SEPARATE. You may select the mode
which best suits your purpose and the equipment you are co­nnecting to your M-AX10.

Dual mode

Separate mode

Bridge conection

• The four channels are connected two by two, so as to

act as two high-output amplifier channels.

• Output comprises two 230 W/ 6 Ω (DIN),200 W/ 6 Ω (FTC)

channels.

• Your speakers must be at least 6 Ω .

Dual conection

• The four channels act as two parallel sets of twin amplifier

channels.

• Output comprises two 110 W/ 3 Ω (DIN),90 W/ 3 Ω (FTC)

channels.

• Speakers with bi-wire terminals will allow you to achieve

high-quality sound.

Separate conection

• The channels act separately as four amplifier channels.

• Output comprises two 110 W/ 3 Ω (DIN),90 W/ 3 Ω (FTC)

channels.

• Connecting a channel divider will allow you to use the

appliance as an amplifier for a multi-channel system.

• You can adjust the volume of speakers connected to the

HIGH channels (INPUT 1) in a range from 0 to 15 dB.
You can also retain the attenuation once you have set it.

• Speakers connected to the LOW channels (INPUT 2) will

always be at maximum volume.

59

M-AX10

REAR SECTION

INPUT 2

This is an input terminal for connecting
CD players,control amplifiers,channel
dividers and other components.

SPEAKERS (R)

These are terminal for right-hand
speakers.

Earth

This is used for an earth
connection with a source
appearance equipped with an
earth-floating function.

INPUT 1

This is an input terminal for
connecting CD players,control
amplifiers,channel dividers and
other components.

SPEAKERS (L)

These are terminal for
left-hand speakers.

60

BEWARE

When connecting,make sure that the
power switch is off,and the power cord
is disconnected from the power supply.
The terminals are arranged symmetrically.
Special care is required when connecting
the speaker cords:
failure to connect them in the correct
manner for the desired mode will result
in lost or imperfect sound.

The rear and under sections of this appliance
are copper plated to ensure high quality sound.
It may somtimes happen that marks are left
during the plating process,but this does not
affect performance.

SPECIFICATIONS

Amplifier Section
(U.S model only)

When set to Bridge mode:
Continuous average power output is 200 Watts* per
channel, min.,at 6 ohms from 20 Herz to 20,000 Herz
with no more than 0.2%** total harmonic distortion.

When set to Dual mode ,Seaprate mode:
Continuous average power output is 90 Watts* per
channel, min.,at 3 ohms from 20 Herz to 20,000 Herz
with no more than 0.2%** total harmonic distortion.

Continuous power output
(driven simultaneously at 20Hz to 20kHz) **
(European mode only)

Bridge mode

T.H.D. 0.15% 6 Ω .................................................................... 220W × 2

T.H.D. 0.09% 8 Ω .................................................................... 190W × 2

Dual, Seaprate mode

T.H.D. 0.15% 3 Ω .................................................................... 100W × 4

T.H.D. 0.09% 4 Ω ...................................................................... 90W × 4

T.H.D. 0.08% 8 Ω ...................................................................... 60W × 4

DIN Continuous power output
(driven simultaneously at 1kHz)
(European mode only)

Bridge mode

T.H.D. 1% 6 Ω .......................................................................... 230W × 2

T.H.D. 1% 8 Ω .......................................................................... 200W × 2

Dual, Seaprate mode

T.H.D. 1% 3 Ω .......................................................................... 110W × 4

T.H.D. 1% 4 Ω .......................................................................... 105W × 4

T.H.D. 1% 8 Ω ............................................................................ 65W × 4

Total harmonic distortion **

Bridge mode

20 Hz to 20 kHz,100W, 8Ω ..........................................................0.08%

Dual, Seaprate mode

20 Hz to 20 kHz,30W, 8Ω.............................................................0.06%

M-AX10

Signal-to Noise ratio (IHF short circuit, A network
ATT THROUGH ON)

INPUT 1,2 .............................................................................. 125dB

Channel separation(20Hz to 20 kHz)

Bridge mode........................................................................... 104dB

Dual, Seaprate mode .............................................................115dB

Power supply/Mischellaneouse
Power requirements

U.S.model ................................................................. AC120V 60Hz

European model................................................... AC230V 50/60Hz

Power comsumption

U.S.model ............................................................................... 370W

European model...................................................................... 400W

Dimensions ................................... 440 (W) × 420 (D) × 178 (H) mm

175/16 (W) × 161/2 (D) × 7 (H)in.)

Weight (without package) ..............................25.8 kg (56 lbs 14oz)

Accessories

Operation instructions .................................................................... 1

Warranty card ................................................................................ 1

NOTE

Specifications and design subject to possible modifications
without notice ,due to improvement.

* Mesured pursuant to the Federal Trade Commissions' Trade
Regulation rule on Power Claims for Amplifier.

** Mesured by Audio Spectrum Analyzer.

Input sensitivity/Impedance

INPUT 1,2 .......................................................................... 1V/47kΩ

Frequency Response

INPUT 1,2 ............................................ 5Hz to 150 kHz +0dB, -3dB

Damping factor (1kHz/20Hz to 20kHz)

............................................................................................ 400/300

61