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ORDER NO.
RRV2345
DUAL DRIVE AMPLIFIER
M-AX10
THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).
Type
KU/CA NY
Model M-AX10
AC120V AC230V
Power Requirement
Remarks
CONTENTS
1. SAFETY INFORMATION ...................................... 2 2. EXPLODED VIEWS AND PARTS LIST ................ 3 3. SCHEMATIC DIAGRAM ..................................... 12 4. PCB CONNECTION DIAGRAM .......................... 24 5. PCB PARTS LIST ............................................... 36 6. ADJUSTMENT .................................................... 41 7. GENERAL INFORMATION ................................ 7.1 IC ................................................................. 7.2 PROTECTION CIRCUIT ............................. 7.3 EXPLANATION ............................................ 7.3.1 PRODUCT OVERVIEW ....................... 7.3.2 CIRCUIT DESCRIPTION ..................... 8. PANEL FACILITIES AND SPECIFICATIONS .... 42 42 52 54 54 55 58
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
T ZZV JULY. 2000 Printed in Japan
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 be of identical designation.
(slow operating fuse) on PCB indicate that replacement parts must
REMARQUE (POUR MODÈLE CANADIEN SEULEMENT) Les symboles de fusible (fusible de type rapide) et/ou de remplacement doivent avoir la même désignation.
(fusible de type lent) sur CCI indiquent que les pièces
(FOR USA MODEL ONLY)
1. SAFETY PRECAUTIONS
The following check should be performed for the continued protection of the customer and service technician.
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.
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.
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 on the schematics and on the parts list 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.
Device under test Test all exposed metal surfaces
Reading should Leakage not be above current 0.5mA tester
Also test with plug reversed (Using AC adapter plug as required)
Earth ground
AC Leakage Test
2
M-AX10
2. EXPLODED VIEWS AND 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. · Screws adjacent to mark on the product are used for disassembly.
1
2.1 PACKING
3 2 4
5 10 9 6
FRONT
11
7
(1) PACKING PARTS LIST
Mark No.
NSP NSP NSP 1 2 3 4 5 6 7 8 9 10 11
Description
Literature Bag Instruction Manual (E) Warranty Card Warranty Card Styrol Protector L Styrol Protector R Packing Case Door Sheet Mirror Mat Polyester Bag Recycle Label
Part No.
AHG-117 ARB7217 See Contrast table (2) See Contrast table (2) AHA9014 AHA9015 See Contrast table (2) AHG7064 RHC1024 VHL1004 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
NSP NSP
No.
3 4 7 11
Part No. Symbol and Description M-AX10/KU/CA
Warranty Card Warranty Card Packing Case Recycle Label ARY7045 Not used AHD7875 ARW7091
Remarks M-AX10/NY
Not used ARY7022 AHD7874 Not used
3
M-AX10 2.2 EXTERIOR
64 77 73 73 57 39 32 52 6 49 A 52 B 52 6 32 52 36 49 25 71 11 83 64 27 60 73 73 C 71 71 71 46 D 73 71 E 46 F 73 64 83 33 22 73 Take care to the edge when sevicing 38 73 37 61 45 47 61 73 53 40 37 42 42 42 G Q 42 42 Refer to "2.4 FRONT PANEL" 51 G 50 D N AB 20 16 85 62 40 70 35 70 70 O 35 50 E 37 75 Q 44 21 9 67 8 91 P 67 45 38 61 36 61 45 54 Take care to the edge when servicing 62 62 62 30 45 30 62 62 70 62 70 62 24 76 72 48 70 76 37 18 33 16 24 72 48 74 17 74 45 26 88 19 22 71 75 71 71 11 39 39 57 67 39 34 57 67 26 73 73 55 36 39 67 34 39 34 67 57 57 31 31 P 75 23 25 76 14 39 22 78 78 44 2 44 5 78 4 22 15 44 78 44 5 4 4 15 76 1 4 67 H I C H I 23 67 F J K 67 J K M 39 39 73 79 77 49 45 56 73 39 39 H 39 62 N O L I 62 J 42 K 49 42 7 64 57 90 68 89 59 Refer to "2.3 REAR PANEL" 45 58 45
I
67 L 43
for NY type
L
M 43
B
3 10
44
73 44 44 28 29 68 80 68 65 44 69 80 65 44 29
47
4
45
M-AX10
for KU type
32 52 6 52 52 6 12 82 25 71 12 11 75 83 81 27 60 64 C 73 73 73 86 73 75 71 46 D 73 71 E 46 73 F 64 12 12 71 71 71 75 71 71 11 25 32 52
82
87
83
81
5
M-AX10
(1) EXTERIOR PARTS LIST
Mark No.
1 2 3 4 5 6 7 8 9 10 NSP 11 12 13 14 15 16 17 18 19 20 NSP 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45
Description
C.AMP (L) ASSY C.AMP (R) ASSY POWER SUPPLY ASSY Power MOS FET (Q1,Q2,Q5,Q6) Power MOS FET (Q3,Q4,Q7,Q8) Electric Capacitor(C1-C4) Power Transformer Fuse (FU1) 16P FFC 60V (J17) Wire with 2P Housing (J18) Cable (J9,J10) Cable (J23,J24) ·········· PCB Holder (PLS) Plate Stay L (MET) Stay S (MET) Side Frame R Side Frame L Panel Stay (MET) Bottom Plate PCB Holder Transistor Cover L L Type Plate Earth Plate Heat Sink (AL) Sub Inner Plate (MET) AC Code Cover (MET) Insulator Cord Clamper Spacer Spacer Damping Plate Damping Plate Cushion A Sheet Tape Tape Tape Washer (Plastic) ·········· Screw Screw Screw (Steel) Screw (Steel)
Part No.
See Contrast table (2) See Contrast table (2) See Contrast table (2) IRFP140 IRFP9140 ACH7156 See Contrast table (2) See Contrast table (2) ADD7155 ADX7336 ADX7337 See Contrast table (2) AEC7316 AEE7030 ANA9006 ANA9007 ANA9008 ANA9009 AND7033 ANF7012 ANG1474 ANG1724 ANG7248 ANG9102 ANH7105 ANK7080 ANK9024 ANL7012 RNH-184 AEB7168 AEB7170 AMR7280 AMR7281 PED1001 PED1006 PNM-045 PNM1160 PNM1249 RBF-085 ABA1011 ABA1082 ABA1192 ABA1193
Mark No.
46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91
Description
Screw (Steel) Screw (Steel) Screw (Steel) M4 SH Screw PCB Spacer (3 × 12) Washer (PVC) Screw Side AL L Side AL R Top Plate F (AL) Top Plate R (AL) Bonnet Escutcheon Rear Mole R Rear Mole L Innner Plate (MET) Screw Screw ·········· Screw Screw ·········· Screw Screw Screw PCB Holder (MET) Screw Screw Washer (CU) Washer Binder Screw Screw Screw Trans Shield Screw Fuse (FU2,FU3) Fuse Holder Screw UL Caution Card IPC Caution Label Fuse Card Fuse Card Micro Fuse Caution Card 65 Label FCC Label Fuse Card
Part No.
ABA1207 ABA7006 ABA7045 ABA7051 AEC1372 RBF1034 VBA1056 AAH7033 AAH7034 AAH7035 AAH7036 AAK7658 AAP7056 AAP7057 ANK7081 BBT30P100FCC BBT30P080FCC IBZ40P140FCC BBZ40P180FCC IBZ30P060FCC IBZ30P080FCC IBZ40P080FCC ANG9101 PMZ40P060FCU VBZ35P080FMC WG40FCC WH30FUC ZCA-SKB90BK ABA1050 IBZ40P080FCC ABA1208 ANK7074 VCZ30P100FMC See Contrast table (2) See Contrast table (2) BBZ40P080FCC AAX-313 See Contrast table (2) See Contrast table (2) See Contrast table (2) See Contrast table (2) See Contrast table (2) See Contrast table (2) See Contrast table (2)
NSP
NSP NSP NSP NSP NSP NSP NSP NSP NSP
NSP NSP NSP NSP NSP NSP
Refer to next page about Contrast table (2).
6
M-AX10
(2) CONTRAST TABLE
M-AX10/KU/CA and M-AX10/NY are constructed the same except for the following:
Mark No.
1 2 3 7 8 NSP 12 81 82 85 86 87 88 89 90 91
Part No. Symbol and Description M-AX10/KU/CA
C. AMP(L) ASSY C. AMP(R) ASSY POWER SUPPLY ASSY Power Transformer Fuse (FU1) Cable (J23,J24) Fuse (FU2,FU3) Fuse Holder IPC Caution Label Fuse Card Fuse Card Micro Fuse Caution Label 65 Label FCC Label Fuse Card AWX7673 AWX7674 AWX7664 ATS7277 VEK1029 (10A) ADX7335 AEK7069 (20A) AKR7002 AAX7784 AAX7795 AAX7796 AAX7810 ARW7050 VRW1559 Not used
Remarks M-AX10/NY
AWX7280 AWX7281 AWX7662 ATS7251 REK-106 (4A) Not used Not used Not used Not used Not used Not used Not used Not used Not used AAX1589
NSP NSP NSP NSP NSP NSP
7
M-AX10 2.3 REAR PANEL
3 or 4 26
G I
27 26 21 8 32 27 25 40 38 8 15 11 24 28 29 11 C H 9 38 A 18 18 39 42 18 C D 38 38 F 5 D 38 B 13 18 44 28 28 28 10 28 16 38 7 8 37 6 17 7 8 37 41 38 28
22
A G 22 E B 32 19
33
31
31
A
13 14 36 34 35 46 20 30 E G
43
9 30 F H 46
47
24
10
23 45 26 27 21 25 26 27 32 40
HK
1 or 2
8
M-AX10
(1)REAR PANEL PARTS LIST
Mark No.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 NSP NSP NSP NSP NSP 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 NSP 46 47
Description
V.AMP (L) ASSY V.AMP (R) ASSY INPUT (L) ASSY INPUT (R) ASSY JOINT ASSY Ground Terminal Speaker Terminal 1P (CN1,CN2,CN5,CN6) Speaker Terminal 1P (CN3,CN4,CN7,CN8) 23P FFC 60V (J5,J6) AC Cord with Plug 11P Housing Wire (J3,J4) ·········· Connector Assy (J7) Connector Assy (J8) Rear Panel (MET) Rear Panel Plate R Rear Panel Plate L PCB Holder (MET) Shield Plate(PLS) AC Shield L Shield Cover Spacer Tape Damping Plate Damping Plate Tape Fiber Washer Screw Screw Screw Rivet Nylon Rivet PCB Spacer (14) Card Spacer PC Support Cushion A Screw Screw Nut Binder Input Plate (MET) Locking Card Spacer Ferrite Core Screw AC Shield Case (PLS) Earth Lead Wire AC Cord Spacer
Part No.
AWX7278 AWX7279 AWX7273 AWX7274 AWX7283 AKE-046 AKE7009 AKE7010 ADD7154 See contrast tabel (2) ADX7278 PG10MM-F15 PG10MM2F15 ANC7820 See contrast tabel (2) See contrast tabel (2) ANG9101 ANK7076 ANK9025 ANK9026 AEB7169 AEH7008 AMR7278 AMR7281 PNM1249 RBF1045 ABA1192 BBT30P100FCC ABA1207 AEC-441 AEC7242 DEC1387 DEC1772 VEC1549 PED1001 BBZ30P080FCC IBZ30P060FCC NK70FCU ZCA-SKB90BK ANG7274 VEC1596 See contrast tabel (2 ABA1011 ANK7075 DE025BF0 ANG1153
NSP
NSP
(2) CONTRAST TABLE
M-AX10/KU/CA and M-AX10/NY are constructed the same except for the following:
Mark No.
10 16 17 43
Part No. Symbol and Description M-AX10/KU/CA
AC Cord with Plug Rear Panel Plate R Rear Panel Plate L Ferrite Core ADG7041 ANC7288 ANC7289 Not used
Remarks M-AX10/NY
ADG7038 ANC7285 ANC7286 ATX1031
9
M-AX10 2.4 FRONT PANEL
38(1/3) 20 23
43 6 43
26 17 7
18 24 22 25 19
16 11 44
10
4 42 12 47 8 27
E
3 13
36 14 42 15 44
D
29 5 41 31 27 29 41 44 12 10 42 49 44 44
49 44
44
C
1 38(2/3)
35
46 40 34 21 30 48 44 32
39 9
47
F
2
38(3/3) 44 44 42 43 28 33 44 37 45
10
M-AX10
·
FRONT PANEL PARTS LIST
Description
SW ASSY VR ASSY FRONT ASSY LED ASSY Cord with Plug Cord with Plug (J20) Magnet Door Hinji L (PLS) Door Hinji R (PLS) Door Assy (MET) Inner Panel (AL) Damper Assy Spacer Damping Plate Tape Cushion A Cushion B LED Lens LED Filter S(PLS) LED Film (PLS) Display Panel L (PLS) Cover LED Filter L (PLS) Mode Panel (PLS) Mode Lens (PLS) Panel S (PLS) Door Cushion Tape Door Yoke (MET) Name Plate G (AL) Cushion A Knob S (PLS) Knob M (AL) Block Power Button (ABS) Side Panel L (AL) Side Panel R (AL) Panel Base (PLS) Door Panel (AL) Front Panel (AL) Screw Screw Screw Screw Nut Screw Screw Screw (STEEL) Washer (PLS)
Mark No.
NSP NSP NSP NSP NSP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49
Part No.
AWX7282 AWX7334 AWX7276 AWX7277 ADH7022 DE005VF0 AMF7003 AMR9199 AMR9200 ANG9100 ANB7184 AXA9013 AEB7169 AMR7282 PNM1249 REB1060 REB1061 AAK2459 AAK7657 AAK7669 AAK9044 AAK9045 AAK9046 AAK9047 AAK9048 AAK9049 AED9014 AEH7009 ANB7187 PAN1377 PED1001 AAB7200 AAB7201 ANL7015 VNK4159 AAH7037 AAH7038 AMB9020 ANB7182 ANB7183 BBT30P080FCC BBZ30P080FCC IBZ30P060FCC IBZ30P080FCC NK90FCU PMH30P060FMC PSZ20P060FMC ABA1050 ABF7007
NSP NSP NSP NSP NSP
11
1
2
3
4
M-AX10
3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM
3.1 OVERALL CONNECTION DIAGRAM AND JOINT ASSY
A
E
LED ASSY (AWX7277)
D
FRONT ASSY (AWX7276)
F
VR ASSY (AWX7334)
B
POWER SUPPLY ASSY
KU/CA : (AWX7664) NY : (AWX7662)
B
L712 RTF1167 R712 2.2
C.AMP(L) ASSY
KU/CA : (AWX7673) NY : (AWX7280)
C
H
V.AMP(L) ASSY (AWX7278)
G
INPUT(L) ASSY (AWX7273)
D
12
A
1
2
3
L711 RTF1167
I
4
5
6
7
8
M-AX10
C
SW ASSY (AWX7282)
Note : When ordering service parts, be sure to refer to "EXPLODED VIEWS and PARTS LIST" or "PCB PARTS LIST".
A
B
From AC Power Cord
A
JOINT ASSY (AWX7283)
L
C.AMP(R) ASSY
KU/CA : (AWX7674) NY : (AWX7281)
C
J
INPUT(R) ASSY (AWX7274)
K
V.AMP(R) ASSY (AWX7279)
D
5
6
7
A
8
13
1
2
3
4
M-AX10 3.2 POWER SUPPLY, SW ASSY
B
A
POWER SUPPLY ASSY (KU/CX :AWX7664 ,NY :AWX7662)
C1, C3 and
J805
I
CN501
J803 J801
PIOWER TRANSFORMER
120V(KU/CA) 230V (/NY)
6
B
5 1
CN803
6 5 4 3 2 4 3 2 1
C2, C4 and
K
CN601
C
J802 J804 J808 J806
C
SW ASSY
(AWX7282)
CN701
CN853
CN852
CN851
FU1
D
FU1 KU :VEK1029(10A) NY :REK-106(4A)
14
B C
1
2
3
4
5
6
7
8
A
CN805
M-AX10
CN711
A
CN804
D
CN901
B
+24V
+24V
C
CN806
D
A CN712 · NOTE FOR FUSE REPLACEMENT CAUTION - FOR CONTINUED PROTECTION AGAINST RISK OF FIRE. REPLACE WITH SAME TYPE AND RATINGS ONLY.
5 6 7
B
8
15
1
2
3
4
M-AX10 3.3 FRONT, LED, VR ASSY
A
CN901
B
CN804
B
C
CN751
J902
E
LED ASSY (AWX7277)
CN761
J901
D
F
16
1
VR ASSY (AWX7334)
D E F
2
3
4
5
6
7
8
M-AX10
D
FRONT ASSY (AWX7276)
A
SWITCHES
S901 : S902 : S903 : S904 : S905 : ATT THROUGH ATT HOLD INPUT ILLUMINATION MODE
B
C
D
5
6
7
D
8
17
1
2
3
4
M-AX10
3.4 INPUT (L), INPUT (R) ASSY
A
G
INPUT(L) ASSY
(AWX7273) 12dB FLAT AMP
B
JA101
C
JA102
D
18
G
1
2
3
4
5
6
7
8
M-AX10
J201
K
CN401
A
JA201
CN201
JA202
J
INPUT(R) ASSY
(AWX7274)
A
CN714
SIGNAL ROUTE
: AUDIO SIGNAL
B
DAC VR
J101
H
CN301
C
CN101
A
CN713
D
5
6
7
G J
8
19
1
2
3
4
M-AX10
14dB POWER AMP
3.5 V.AMP (L) ,V.AMP (R) ASSY
A
H
V. AMP(L) ASSY
(AWX7278)
B
G
J101
CN301
DC ADJ(HL)
C
A
CN715
CN302
DC ADJ(LL)
D
20
H
1
2
3
4
5
6
7
8
M-AX10
SIGNAL ROUTE
: AUDIO SIGNAL
V. AMP(R) ASSY
J401
A
J301
L
CN607
I
CN507
(AWX7279)
L
J402
CN608
I
CN508
J302
K
J
J201
CN401
B
L
CN402
CN602
I
CN502
CN403
C CN303
A
CN716
J306
D
5
6
7
H K
8
21
1
2
3
4
M-AX10
3.6 C.AMP (L), C.AMP (R) ASSY
A
CN505 B
I
CN507
C. AMP(L) ASSY
(KU/CA : AWX7673) ( NY : AWX7280)
CURRENT AMP
H
J301
CN508
H
J302
CN502
IDLE ADJ(HL)
C
H
CN303 IDLE ADJ(LL)
D
22
I
1
2
3
4
5
R
6
R R R
7
R
8
To C2,C4
R
M-AX10
CN604
CN601
CN603
A
L
CN605
C. AMP(R) ASSY
(KU/CA : AWX7674) ( NY : AWX7281)
CN607 CN608 CN602
R
R
R
R
R
R
R
R
J401
K
K
J402
K
CN403
R
R
B SIGNAL ROUTE
: AUDIO SIGNAL
CN501
To C1,C3
J513 J514
C
J511
J512
J501
D
5
6
7
I L
8
23
1
2
3
4
M-AX10
4. PCB CONNECTION DIAGRAM
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 Symbol In Schematic Diagrams B C E B C E Part Name
4.1 JOINT, SW, LED, VR ASSY
A
B
JOINT ASSY
SIDE A
B C E B B C E D D G S G S D G S C E B C E
Transistor
B
CN805
CN806
Transistor with resistor
J
Field effect transistor
G
CN101
CN201
Resistor array
B
3-terminal regulator
K
CN402
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.
H
CN302
Connector
Capacitor
SIDE A
C
P.C.Board
Chip Part
SIDE B
(ANP7281-A)
E C
SW ASSY
LED ASSY
F
D
J902
VR ASSY
D
D
J901
(ANP7281-A)
B CN852
24
1 2
(ANP7282-C)
(ANP7281-A)
3
4
1
2
3
4
M-AX10
A
SIDE B
A
JOINT ASSY
B
C (ANP7281-A)
E F
VR ASSY
LED ASSY
C
SW ASSY
D (ANP7281-A)
(ANP7281-A)
(ANP7282-C)
25
1 2 3 4
1
2
3
4
M-AX10 4.2 POWER SUPPLY ASSY
B
SIDE A
A
POWER SUPPLY ASSY
L
CN601
B
D
CN901
A
CN712
AC POWER CODE POWER TRANSFORMER POWER TRANSFORMER
C
CN701
C
A
CN711
D
I
CN501
(ANP7282-C)
Q812 Q810 Q811 Q809 Q808 Q806 Q807 Q805 Q804 Q802 Q803 Q801 IC801 IC802 IC805 IC804 IC803
26
1
2
3
4
1
2
3
4
M-AX10
B
POWER SUPPLY ASSY
SIDE B
A
B
C
D
(ANP7282-C)
Q821 Q816 Q814 Q815 Q813 Q818 Q820 Q817 Q819
27
3 4
1
2
1
2
3
4
M-AX10
4.3 FRONT ASSY
D
A
FRONT ASSY
SIDE A
F
CN761
B
CN804
B
E
CN751
C
D
(ANP7282-C)
IC903 Q946 Q949 Q945 IC902 Q943 Q947 Q942 IC901 Q904 Q903 Q901 Q918 Q902 Q952 Q935 Q934 IC904 Q932 Q933
28
1
2
3
4
1
2
3
4
M-AX10
D
FRONT ASSY
SIDE B
A
B
C
D
(ANP7282-C)
Q916 Q915 Q917 Q919 Q926 Q928 Q930 Q951 Q907 Q914 Q950 Q948
29
1 2 3 4
1
2
3
4
M-AX10
4.4 INPUT(L) ASSY
A
G
INPUT(L) ASSY
SIDE A
H
CN301
B
A
Q101 Q106 Q107 Q110 Q111 Q114 IC101
CN713
IC102 Q119 Q120 Q129Q131
(ANP7281-A)
G
C
INPUT(L) ASSY
SIDE B
D
Q116 Q115
Q117
Q126Q128 Q118
30
1 2 3 4
1
2
3
4
M-AX10
4.5 INPUT(R) ASSY
J
SIDE A
INPUT(R) ASSY
A
K
CN401
B
CN714
Q220 Q229Q231 Q219 IC202
A
IC201 Q211 Q214 Q207 Q210 Q201 Q206
(ANP7281-A)
J
SIDE B
INPUT(R) ASSY
C
D
Q226Q228 Q218
Q217
Q216 Q215
31
1 2 3 4
1
2
3
4
M-AX10
4.6 V. AMP(L) ASSY
H
A
V. AMP(L) ASSY
SIDE A
A
CN715
I
CN508
I
CN502
B
I
CN507
G
VR301 Q321 Q324 Q309 Q316 VR302 Q305 Q301 Q308 Q304 Q333 Q334
J101
(ANP7294-C)
H
C
V. AMP(L) ASSY
SIDE B
D
Q341 Q344
Q325 Q331 Q328
Q332
Q329 Q336 Q335
Q337 Q340 Q338
32
1 2 3 4
1
2
3
4
M-AX10
4.7 V. AMP(R) ASSY SIDE A
K
V. AMP(R) ASSY
A
A
CN716
L
CN608
L
CN602
L
CN607
B
J
J201
(ANP7294-C)
Q433 Q434 VR402 Q401 Q405 Q404 Q408 VR401 Q409 Q416 Q421 Q424
SIDE B
K
V. AMP(R) ASSY
C
D
Q440 Q437 Q438
Q429 Q436 Q435
Q432
Q431 Q425 Q428
Q441 Q444
33
1 2 3 4
1
2
3
4
M-AX10 4.8 C. AMP(L) ASSY
I
A
C. AMP(L) ASSY
VR502, VR501
Q515 Q513
H
CN303
SIDE A
B
J302
H
H
J301
(ANP7294-C)
I
C. AMP(L) ASSY
Q502, Q501 Q520, Q519
C
SIDE B
Q504, Q506, Q508, Q510 Q518
D
Q512, Q511, Q517
Q507, Q509, Q505, Q503
34
1 2 3 4
1
2
3
4
M-AX10
4.9 C. AMP(R) ASSY
L
VR602, VR601 Q615 Q613
C. AMP(R) ASSY
A
K
CN403
SIDE A
B
J401
(ANP7294-C)
K
K
J402
L
C. AMP(R) ASSY
Q601, Q602 Q619, Q620
C
SIDE B
Q608, Q610, Q606, Q604 Q618 Q617, Q611, Q612
D
Q603, Q605, Q607, Q609
35
1 2 3 4
M-AX10
MarkPCB Description 5. No. PARTS LISTPart No. NOTES: Mark No. Description Part No.
· 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%). 561 ........................................................ RD1/4PU 5 6 1 J 560 56 × 101 473 ........................................................ RD1/4PU 4 7 3 J 47k 47 × 103 0.5 R50 ..................................................................................... RN2H R 5 0 K 1 1R0 ..................................................................................... RS1P 1 R 0 K Ex.2 When there are 3 effective digits (such as in high precision metal film resistors). 5621 ...................................................... RN1/4PC 5 6 2 1 F 5.62k 562 × 101
CONTRAST OF PCB ASSEMBLIES
Part No. Mark
NSP
Symbol and Description M-AX10 /KU/CA
POWER AMP ASSY V. AMP (L) ASSY V. AMP (R) ASSY C. AMP (L) ASSY C. AMP (R) ASSY AF COMPLEX (A) ASSY INPUT (L) ASSY INPUT (R) ASSY SW ASSY JOINT ASSY VR ASSY AF COMPLEX (B) ASSY POWER SUPPLY ASSY FRONT ASSY LED ASSY AWH7003 AWX7278 AWX7279 AWX7673 AWX7674 AWM7410 AWX7273 AWX7274 AWX7282 AWX7283 AWX7334 AWM7507 AWX7664 AWX7276 AWX7277
Remarks M-AX10 /NY
AWH7002 AWX7278 AWX7279 AWX7280 AWX7281 AWM7410 AWX7273 AWX7274 AWX7282 AWX7283 AWX7334 AWM7506 AWX7662 AWX7276 AWX7277
NSP
NSP NSP NSP NSP
NSP
I
C.AMP (L) ASSY
Symbol & Description
IC501,IC502
AWX7673and AWX7680 are constructed the same except for the following:
Mark Part No. AWX7673
AEK7022
AWX7680
Not used
Remarks
IC Protector (10A/125V)
L
C.AMP (R) ASSY
Symbol & Description
IC601,IC602
AWX7674and AWX7681 are constructed the same except for the following:
Mark Part No. AWX7674
AEK7022
AWX7681
Not used
Remarks
IC Protector (10A/125V)
B
POWER SUPPLY ASSY
Symbol & Description
R849 -R852
AWX7664and AWX7662 are constructed the same except for the following:
Mark Part No. AWX7664
Not used
AWX7662
RS2LMF222J
Remarks
36
M-AX10
Mark No. Description Part No. Mark No. Description Part No.
RS1/10S301J RS1/10S3R3J RS1LMF103J RS1/10S J
A
JOINT ASSY
L711,L712 RTF1167
COILS AND FILTERS CAPACITORS
C711,C712 CEAT100M50
R819-R822 R836-R838 R805-R808 Other Resistors
OTHERS
CN805,CN806 CN804 H851,H852 811-822 CN851 10P MT CONNECTOR 16P CONNECTOR FUSE CLIP HEAT SINK AC CODE SOCKET 1-173981-0 9604S-16C AKR1004 ANH7100 RKP1751 RKP1833 RKP1834 VEF1040 VNF1084
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
CN852 AMP U-P CONNECTOR CN853 AMP U-P CONNECTOR 805 PCB BINDER KN801-KN803 EARTH METAL FITTING
B
POWER SUPPLY ASSY (AWX7664)
IC803 IC801,IC802 IC804,IC805 Q815,Q816,Q819,Q820 Q803,Q804,Q811,Q812 Q805,Q806 Q807,Q808 Q821 Q813,Q814,Q817,Q818 Q801,Q802,Q809,Q810 D821-D828 D801-D804 D805-D812,D833-D837 D829-D832 D813-D816,D841-D844 D817-D820 D838 AEK7019 AEK7021 BA178M24T 2SA1255 2SA1837 2SA970 2SC2240 2SC2712 2SC3138 2SC4793 1SS355 F10KF20 S5566G(TPB2) UDZ16B UDZ24B UDZ36B UDZS10B
C
SW ASSY
S701 ASG-553
SEMICONDUCTORS
SWITCHES AND RELAYS CAPACITORS
C701 (0.01µF/250V) ACE7014 RKP1833
OTHERS
CN701 AMP U-P CONNECTOR
D
FRONT ASSY
IC904 IC902 IC903 IC901 Q952 Q903,Q904 Q901,Q902 Q943,Q946 Q907-Q914,Q942,Q945 Q918 Q915-Q917,Q919,Q926,Q928 Q930,Q947-Q951 Q932-Q935 D933-D935,D953 D927 D936 D901-D914 D929-D932 D951,D952 AT24C01-10PC BA178M05T BA178M15T PD5508B9 2SA1048 2SC2458 2SC2705 2SJ146 DTA124EK DTA143EK DTC124EK DTC124EK DTC124ES 1SS355 DAN202K DAP202K NSCW100-8511 SLP6118C51H UDZS7.5B
SEMICONDUCTORS
COILS AND FILTERS
L801,L802 RTF1167
CAPACITORS
C851 (0.01µF/250V) C803,C804,C833 C829-C832,C836 C813-C820 C809-C812 C821-C824 C838,C840 C839,C841 C825-C828 C834 C837 C805-C808 C842 C801,C802 ACE7014 CEANP1R0M50 CEAT100M50 CEAT100M63 CEAT471M2A CEATR10M2A CEHAT100M50 CEHAZA220M25 CEHAZL101M50 CEHAZL182M35 CEHAZL331M35 CEHAZL471M50 CFTYA224J50 CKCYF103Z50
COILS AND FILTERS
X901 (4.19MHz) VSS1014
SWITCHES AND RELAYS
S905 S901-S904 ASD7014 VSG1009
RESISTORS
R803,R804 R813,R814 R831,R839 R815-R818 RD1/4LMF470J RD1/4MUF124J RS1/10S100J RS1/10S101J
CAPACITORS
C921,C922,C942 C961,C963,C964 C941,C955,C957 C953 CEHAZA220M25 CEHAZA470M6R3 CEJA100M35 CEJA2R2M50
37
M-AX10
Mark No. Description Part No.
CKSQYF103Z50 CKSQYF104Z50 CKSQYF104Z50
Mark No.
L101
Description
Part No.
RTF1167 VSR1008 ACE7012 ACH7116 CCCSL560K2H CCSQCH100D50 CCSQCH101J50 CCSQCH470J50 CEAT100M50 CEHAZA101M25 CEHAZA220M25 CEHAZL471M25 CEHAZL471M50 CFTYA104J50 CQHA561J2A RCH1077 RCH1139 VCH1156
C927,C954 C901-C914,C923-C926 C931-C934,C951,C956
COILS AND FILTERS SWITCHES AND RELAYS
RESISTORS
Other Resistors RS1/10S J
RY101-RY103
CAPACITORS
C101,C102,C105-C108 (220pF) C140 (47µF) C103,C104 C135 C132-C134 C128 C129,C130 C121,C122 C131 C125,C126 C115-C118 C119,C120,C123,C124 C109,C110 C141,C142 (22µF) C111-C114 (47µF/10V) C127 (100µF/6.3V)
OTHERS
902 901 CN901 J902 J901 3P CABLE HOLDER 7P CABLE HOLDER 16P CONNECTOR 3P JUMP WIRE 7P JUMP WIRE 51048-0300 51048-0700 52492-1620 D20PDY0310E D20PDY0715G
E
LED ASSY
D752-D754 NSCW100-8511
SEMICONDUCTORS RESISTORS
All Resistors RS1/10S J
OTHERS
CN751 3P JUMPER CONNECTOR 52151-0310
RESISTORS
R137,R138 R135,R136,R166 R139,R140 R101,R102 R103,R104 R157,R158 Other Resistors RDR1/4VM1001F RDR1/4VM2400F RDR1/4VM3001F RDR1/4VM391J RDR1/4VM473J RS1/10S1002F RS1/10S J
F
VR ASSY
IC761 Q761,Q762 TC74HC86AP 2SK1132
SEMICONDUCTORS
SWITCHES AND RELAYS
S761 ASX7028
OTHERS
J101 6P HOUSING SHIELD WIRE JA101,JA102 PIN JACK(1P) CN101 11P SOCKET ADX7253 AKB7102 KP200TA11L
CAPACITORS
C761 C762 CEAT100M50 CKSQYF104Z50
RESISTORS
All Resistors RS1/10S J
H
52147-0710
V. AMP (L) ASSY
Q325,Q326,Q341,Q342 Q309,Q310 Q301,Q302,Q307,Q308 Q313,Q314,Q323,Q324 Q303-Q306,Q315,Q316 Q321,Q322 Q327,Q328,Q343,Q344 Q329,Q331,Q332 Q311,Q312 Q333,Q334,Q339 Q335-Q337,Q340 Q338 D307,D313-D316 D309-D312 2SA1162 2SA1929 2SA970 2SA970 2SC2240 2SC2240 2SC2712 2SC3326 2SC5170 2SK1132 DTA124EK DTC124EK 1SS355 UDZS7.5B
SEMICONDUCTORS
OTHERS
CN761 7P JUMPER CONNECTOR
G
INPUT (L) ASSY
IC101 IC102 Q101,Q102 Q107,Q108,Q113,Q114 Q120 Q103-Q106 Q109-Q112 Q119 Q123,Q124,Q129-Q131 Q115,Q117,Q126-Q128 Q116,Q118 D101-D112 D113,D114 D115 DAC8043FP OP275GP 2SA1048 2SA1145 2SA1145 2SA970 2SC2705 2SC2705 2SK1132 DTA124EK DTC124EK 1SS355 UDZ18B UDZS5.1B
SEMICONDUCTORS
SWITCHES AND RELAYS
RY301,RY302 VSR1008
CAPACITORS
C303,C304,C333-C336 (220pF) C313,C314 (10µF) C301,C302,C319 (10µF) ACE7012 ACH7124 ACH7125
38
M-AX10
Mark No. Description Part No.
CCSQCH270J50 CEAT470M25 CEGA471M50 CEHAZA470M10 CFTYA683J50 CSZSR100M16
Mark No.
Description
Part No.
RS1/10S6801F RS1/10S8201F RS2LMFR22J RS3LMF2R2J ACP7003 RS1/10S J
C305-C308,C323-C326 C311,C312 C315-C318 C309,C310 C331 C337,C338
R503,R504 R521,R522,R537,R538 R509-R512,R531-R534 R513,R514 VR501,VR502 (4.7K) Other Resistors
RESISTORS
R303,R304 R345 R343,R344 R341,R342 R379,R380 R301,R302 R315 R349-R352 R314 R386 R385 R313,R316,R325-R328 R347,R348 VR301,VR302 (220) Other Resistors RDM1/2P221J RDM1/2P3600F RDM1/2P7500F RDM1P3001F RDR1/4PM470J RDR1/4VM104J RS1/10S1001D RS1/10S101J RS1/10S1101D RS1/10S30R0D RS1/10S33R0D RS1/10S3900D RS1/10S5100D ACP7002 RS1/10S J
OTHERS
CN502 23P CONECTOR CN507,CN508 2P TOP POST 501 PCB BINDER KN501,KN502 EARTH METAL FITTING 9604S-23C B2B-EH VEF1040 VNF1084
J
INPUT (R) ASSY
IC201 IC202 Q201,Q202 Q207,Q208,Q213,Q214 Q220 Q203-Q206 Q209-Q212 Q219 Q223,Q224,Q229-Q231 Q215,Q217,Q226-Q228 Q216,Q218 D201-D212 D213,D214 D215 DAC8043FP OP275GP 2SA1048 2SA1145 2SA1145 2SA970 2SC2705 2SC2705 2SK1132 DTA124EK DTC124EK 1SS355 UDZ18B UDZS5.1B
SEMICONDUCTORS
OTHERS
CN303 23P CONNECTOR J301 2WIRE SHIELD HOUSING J302 2WIRE SHIELD HOUSING KN301 EARTH METAL FITTING 9604S-23C ADX7258 ADX7259 VNF1084
I
C. AMP (L) ASSY (AWX7673)
IC501,IC502 IC PROTECTOR(10A) Q503,Q504 Q507-Q510 Q517,Q518 Q513,Q515 Q511,Q512 Q505,Q506 Q501,Q502,Q519,Q520 D501,D502 D503,D504 AEK7022 2SA1162 2SC2712 2SC3138 2SK1132 DTA124EK DTC143EK IMX1 1SS355 BR3371XJ30A
SEMICONDUCTORS
COILS AND FILTERS
L201 RTF1167
SWITCHES AND RELAYS
RY201-RY203 VSR1008
CAPACITORS
C201,C202,C205-C208 (220pF) C240 (47µF) C203,C204 C235 C232-C234 C228 C229,C230 C221,C222 C231 C225,C226 C215-C218 C219,C220,C223,C224 C209,C210 C241,C242 (22µF) C211-C214 (47µF/10V) C227 (100µF/6.3V) ACE7012 ACH7116 CCCSL560K2H CCSQCH100D50 CCSQCH101J50 CCSQCH470J50 CEAT100M50 CEHAZA101M25 CEHAZA220M25 CEHAZL471M25 CEHAZL471M50 CFTYA104J50 CQHA561J2A RCH1077 RCH1139 VCH1156
COILS AND FILTERS
L501 RTF1167
SWITCHES AND RELAYS
RY501,RY502 ASR1035
CAPACITORS
C505,C506 C507 C508 C511,C512 C501-C504 C509 C517,C518 C515,C516 (47µF/10V) CEANP470M10 CEAT100M50 CEHAZA220M25 CEHAZL471M50 CFTYA224J50 CFTYA474J50 CKSQYF104Z50 RCH1139
RESISTORS
R237,R238 R235,R236,R266 R239,R240 R201,R202 R203,R204 RDR1/4VM1001F RDR1/4VM2400F RDR1/4VM3001F RDR1/4VM391J RDR1/4VM473J
RESISTORS
R519,R520,R535,R536 R501,R502 RS1/10S1502F RS1/10S1602F
39
M-AX10
Mark No. Description Part No.
RS1/10S1002F RS1/10S J
Mark No.
Description
Part No.
R257,R258 Other Resistors
L
C. AMP (R) ASSY (AWX7674)
IC601,IC602 IC PROTECTOR(10A) Q603,Q604 Q607-Q610 Q617,Q618 Q613,Q615 Q611,Q612 Q605,Q606 Q601,Q602,Q619,Q620 D601,D602 D603,D604 AEK7022 2SA1162 2SC2712 2SC3138 2SK1132 DTA124EK DTC143EK IMX1 1SS355 BR3371XJ30A
OTHERS
J201 6P HOUSING SHIELD WIRE ADX7253 JA201,JA202 PIN JACK(1P) AKB7102 CN201 11P SOCKET KP200TA11L
SEMICONDUCTORS
K V. AMP (R) ASSY
SEMICONDUCTORS
Q425,Q426,Q441,Q442 Q409,Q410 Q401,Q402,Q407,Q408 Q413,Q414,Q423,Q424 Q403-Q406,Q415,Q416 Q421,Q422 Q427,Q428,Q443,Q444 Q429,Q431,Q432 Q411,Q412 Q433,Q434,Q439 Q435-Q437,Q440 Q438 D407,D413-D416 D409-D412 2SA1162 2SA1929 2SA970 2SA970 2SC2240 2SC2240 2SC2712 2SC3326 2SC5170 2SK1132 DTA124EK DTC124EK 1SS355 UDZS7.5B
COILS AND FILTERS
L601 RTF1167
SWITCHES AND RELAYS
RY601,RY602 ASR1035
CAPACITORS
C605,C606 C607 C608 C611,C612 C601-C604 C609 C617,C618 C615,C616 (47µF/10V) CEANP470M10 CEAT100M50 CEHAZA220M25 CEHAZL471M50 CFTYA224J50 CFTYA474J50 CKSQYF104Z50 RCH1139
SWITCHES AND RELAYS
RY401,RY402 VSR1008
CAPACITORS
C403,C404,C433-C436 (220pF) C413,C414 (10µF) C401,C402,C419 (10µF) C405-C408,C423-C426 C411,C412 C415-C418 C409,C410 C431 C437,C438 ACE7012 ACH7124 ACH7125 CCSQCH270J50 CEAT470M25 CEGA471M50 CEHAZA470M10 CFTYA683J50 CSZSR100M16
RESISTORS
R619,R620,R635,R636 R601,R602 R603,R604 R621,R622,R637,R638 R609-R612,R631-R634 R613,R614 VR601,VR602 (4.7k) Other Resistors RS1/10S1502F RS1/10S1602F RS1/10S6801F RS1/10S8201F RS2LMFR22J RS3LMF2R2J ACP7003 RS1/10S J
RESISTORS
R403,R404 R445 R443,R444 R441,R442 R479,R480 R401,R402 R415 R449-R452 R414 R486 R485 R413,R416,R425-R428 R447,R448 VR401,VR402 (220) Other Resistors RDM1/2P221J RDM1/2P3600F RDM1/2P7500F RDM1P3001F RDR1/4PM470J RDR1/4VM104J RS1/10S1001D RS1/10S101J RS1/10S1101D RS1/10S30R0D RS1/10S33R0D RS1/10S3900D RS1/10S5100D ACP7002 RS1/10S J
OTHERS
CN602 CN607,CN608 601 KN601,KN602 23P CONNECTOR 2P TOP POST PCB BINDER EARTH METAL FITTING 9604S-23C B2B-EH VEF1040 VNF1084
OTHERS
CN403 23P CONNECTOR J401 2WIRE SHIELD HOUSING J402 2WIRE SHIELD HOUSING KN401 EARTH METAL FITTING 9604S-23C ADX7258 ADX7259 VNF1084
40
M-AX10
6. ADJUSTMENT
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. 61. 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
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.
Table 6-3 DC offset adjustment method Adjustment Channel Measurement Point Point L High ch L Low ch R High ch R Low ch VR301 VR302 VR401 VR402 Apply channel speaker terminals (Red, Black) 0V ± 10mV
Adjustment Value
Channel
Adjustment point Measurement point
L High ch L Low ch R High ch R Low ch
VR501 CN505 VR502 CN505 VR601 CN605 VR602 CN605
Between Between Between Between pins 1 and 2 pins 3 and 4 pins 1 and 2 pins 3 and 4
Table 6-2 Adjustment values of idle current
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.
Adjustment Timing
Coarse Adjustment Power ON immediately More than 5 min. and less than 10 min. More than 10 min. and less than Elapsed 15 min. Fine time from Adjustment the coarse More than 15 min. adjustment and less than 30 min. More than 30 min.
Adjustment value (Pin voltage)
14.5mV ± 1.0mV 16.0mV ± 0.5mV 15.5mV ± 0.5mV 15.0mV ± 0.5mV 14.5mV ± 0.5mV
VR302 L Low ch DC OFFSET ADJ VR301 L High ch DC OFFSET ADJ
CN505
CN605
VR402 R Low ch DC OFFSET ADJ VR401 R High ch DC OFFSET ADJ
Rear Side
VR502 L Low ch Idle Current ADJ VR501 L High ch Idle Current ADJ VR602 R Low ch Idle Current ADJ VR601 R High ch Idle Current ADJ
Front Side
Fig. 6-1 Adjustment and measurement points
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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42
Mark
P53 P17/Srdy/A10 P16/CLK/A9 P15/Sout/A8 P14/Sin/A7 P13/T1/A6 P12/T0/A5 P11/A4 P10 P27/IN7 P26/IN6 P25/IN5 P24/IN4 P23/IN3/A3 P22/IN2/A2 P21/IN1/A1 P20/IN0/A0 Vref/CE Xin Xout Vss Vcc P50/Xcin P51/Xcout RESET P30/INT0/A11 P31/INT1/A12 P32/CNTR0/OE P33/CNTR1/Vpp P40/A13 P41/A14 P42 P43 P00/D0 P01/D1 P02/D2 P03/D3 P04/D4 P05/D5 P06/D6 P07/D7 P52
Pin Name
I/O
Pin Function
VR2 I LD O CLK O Serial I/O pins SRD O IND. IN1 O IND. IN2 O Timer output IND. SEPA O IND.BRD O IND. DUAL O IND. ATT.THROUGH O O IND. ATT. HOLD INPUT2 O DACVR O Analog input SEPARATE O INVERT O SPRYH O SPRYG O Vref - Reference voltage input Xin I Clock input Xout O Clock output Vss - Power supply voltage input Vcc - Power supply voltage input VR4 I VR5 I RESET I Reset input BACKUP I External inrerrupt input BRD. I DAL. I Timer input VR1 I SEPA I FMT O ILL2 O ILL1 O SDA I/O SCL O MD WKUP I ATT. THROUGH I Key ON wake-up function ATT. HOLD I INPUT I ILL. I P-DET I VR3 I
42
M-AX10
Following item "1."~"7." (P.43~P.51) describe about the specifications of IC901 PD5508B9.
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
Bright / dark / off 1/2 ON/OFF ON/OFF At ATT. HOLD ON only
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
PRO.
RAM initialize
ILL INPUT
EEPROM readout
ATT. THR ATT. HOLD ATT. LEVEL
BACKUP check OK ? N
Y
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:
1
RAM clear for memory communication
Flag for the power ON Flag for initializing
[ f_power ] = 1 (IC901 Internal Port) [ f_i nit ] = 1
Timer [ tminit ] = 50 msec set 2 3
Bit 0 Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7
ILL1 ILL2 INPUT ATT. THROUGH ATT. HOLD SEPARATE DUAL BRIDGE
ON/OFF ON/OFF 1/2 ON/OFF ON/OFF ON/OFF ON/OFF ON/OFF
RETURN Fig. Flow chart of RESET
VOLUME position (5 bit) * At ATT. HOLD ON only BACKUP code
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)")
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.
(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)
1.4 TEST Mode
None
16 (SPRYH) 10 msec
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. (normal operation mode) · 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 consumption mode and stops the oscillation of system clock.)
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 Then the timers are set. Refer to the next page Fig.1.
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)
IC901 PD5508B9
31 (FMT) 3 sec 5 sec
44
M-AX10
Reset AC check
1 200 msec
Register initial setting
2
RAM initial setting when EEPROM read out is OK. RAM initial setting when EEPROM read out is NG.
3
4
Timer [tminit]
5
50 msec
INITCONT start INITCONT processing
6
ACTION start Relay Timer [tmprot]
$ 8 sec
MUTE Timer [tmmute] INPUT SW set
# 3 sec 7
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
8 9 100 msec 0 -
~ 40 msec = 2 sec
Tact key accept start
!
Timer [tmdcerr]
@ 5 sec
Silent mode
% 200 msec
Fig.1 Timing chart of initializing process from the reset
45
M-AX10
3. Key Input (IC901)
IC901 PD5508B9
IC901 Microcomputer 36 (MD WKUP) 37 (ATT.THROUGH) 38 (ATT.HOLD) 39 (INPUT) 40 (ILL) SW1 SW2 SW3 SW4 SW5
Key input, indicators and processes
Key Input Port
37 (ATT. THROUGH)
ACT
L
Indicator Process Port
DUAL
Contents of Process BRIDGE
Alternates "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").
Alternates "H" and "L" 10 (IND ATT. THROUGH) alternately at each key input.
39 (INPUT) 38 (ATT. HOLD)
L
5 (IND IN1) 6 (IND IN2) 11 (IND ATT. HOLD)
Sets INDIN1 and INDIN2 to Sets INDIN1 and INDIN2 "H" and "L" alternately at to "H" and "L" alternately each key input. at each key input. Key disabled. Always "L".
L
Key disabled. Always "L". Alternates "H" and "L" at each key input. Key disabled with ATT. THROUGH ON.
40 (ILL)
None
Key Input Port
37 (ATT. THROUGH)
ACT
L
Indicator Process Port
13 (DAC VR)
Contents of Process DUAL
ON : "H" OFF : "L"
BRIDGE
ON : "H" OFF : "L"
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.
39 (INPUT) 38 (ATT. HOLD)
L
12 (INPUT2)
INPUT1 : "L" INPUT2 : "H" Key disabled.
INPUT1 : "L" INPUT2 : "H" Key disabled.
L
40 (ILL)
L
32 (ILL2) 33 (ILL1)
Cycles Bright/Dark/Off at each key input. (ILL1, ILL2) Bright Dark Lamp Off LED Off (H, L) (L, H) (H, H) (L, L)
Factory setting: Bright (H, L)
46
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.
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.
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
EEPROM writing
1
Relay
2 10 msec 3 5 sec
Mute
4 40 msec 5
LED ON/OFF processing 2 sec
6 40 msec
Switching
7
100 msec VOL. processing (ON OFF)
8 2 sec
VOL. data line processing (OFF ON)
9
Silent processing
0 200 msec
Fig.2 Timing chart when ATT. through key is pressed
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
4.4 ILL Key Processing
Each press of the key cycles Bright, Dark, Lamp Off, and LED Off.
ILL key is pressed
1
LED processing
1 2 40 msec
Port processing
2
SILENT processing
Switching processing
3 40 msec
Silent processing
3 4
Fig.5 Timing chart when ILL key is pressed
Fig.3 Timing chart when INPUT key is pressed
4.5 VOL Key Processing
VOL operation
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.
ATT. HOLD key is pressed. EEPROM writing (OFF ON) EEPROM writing (ON OFF) VOL. transfer (ON OFF)
VOL input valid
1 typ. 15 msec
Data transfer to DAC
2 typ. 16 msec 3
SILENT processing
4 1 typ. 8 msec 2 typ. 1 msec 3 typ. 10 msec
5 sec
Fig.6 Timing chart when volume is input
4.6 Invalid Key Input
An invalid key is pressed.
LED processing
4 typ. 0 msec
SILENT processing HOLD processing (OFF ON) SILENT (OFF ON)
1 5
5 sec
Fig.7 Timing chart when an invalid key is pressed
6
SILENT (ON OFF)
6'
Fig.4 Timing chart when ATT. HOLD key is pressed
48
M-AX10
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
IC901 PD5508B9
Mode Indicator Contents of Process Input Port ACT Process Port
27 (BRIDGE) 28 (DUAL) 30 (SEPA.) L L L 8 (IND BRD.) 9 (IND DUAL) 7 (IND SEPA.) Sets to "H". Sets to "H". Sets to "H".
Table Mode select port processing
Mode Input Port ACT
27 (BRIDGE) 28 (DUAL) 30 (SEPA.) L L L
Contents of Process Process Port 12 (INPUT2)
INPUT1 : "L" INPUT2 : "H" INPUT1 : "L" INPUT2 : "H" Fixed at "L"
13 (DACVR)
ATT. through : "L" ATT. exist ATT. exist ATT. exist : "H" : "H" : "H" ATT. through : "L" ATT. through : "L"
14 (SEPARATE) 15 (INVERT)
"L" "L" "H" ATT. through : "H" ATT. exist ATT. exist ATT. exist : "H" : "L" : "L" ATT. through : "L" ATT. through : "L"
16 (SPRYH)
"H" "H" "H"
17 (SPRYG)
"L" "L" "L"
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 (ATT.THROUGH) 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
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)
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)
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
PROCESSOR Attenuation (dB)
-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! 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
Serial Data
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
Serial Data
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. 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 1.0 sec sec ON OFF ON OFF
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.
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
Switching (restoring the original setting)
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.
20 msec
20 msec
IC901 PD5508B9
10 msec ILL processing
Silent mode 200 msec Fig.8 Timing of mode switching error processing
DAC8043FP (INPUT(L) ASSY : IC101, INPUT(R) ASSY : IC201)
· D/A Converter IC
· Pin Assignment (Top View)
VREF 1 RFB 2 IOUT 3 GND 4
5 VDD 6 CLK 7 SRI 8 LD
· Block Diagram
2 RFB RFB VREF 1 12-BIT D/A CONVERTER 12 LD 5 12-BIT DAC REGISTER 8 VDD 12 CLK 7 SRI 6 4 GND 12-BIT INPUT SHIFT REGISTER 3 IOUT
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 Overrcurrent detection : : about over ± 3V about over 14~15A
52
C.AMP (L) ASSY
DC VOLTAGE DETECTION CIRCUIT
P-DET
OVERCURRENT DETECTION CIRCUIT
(KU/CA : AWX7673) ( NY : AWX7280)
+HOUT L
[H CH L]
HOUT L
+LOUT L
[L CH L]
LOUT L
DC VOLTAGE DETECTION CIRCUIT OVERCURRENT DETECTION CIRCUIT
+23V
To SPRYH U-com IC901 P-DET
M-AX10
Fig.1 PROTECTION CIRCUITS
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).
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.
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.
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.
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.
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
OUTPUT VOLTAGE DUAL SEPARATE 12dB FLAT AMP 20V(100W)/4 14dB POWER AMP BRIDGE 37.1V(200W)/6
Block Diagram
Input 2 (Low ch)
7.3.2 Circuit Description
+ +
Red
MUTE
Low ch Blk Bridge Blk High ch Red
1V/50k
Input 1 (High ch)
Vref Iout MUTE
+ + +
LOCAL CIRCUT ON/OFF Microcomputer ±18V Op Amp IC
INDICATOR ATT CONTROL FUNC MUTE MODE RY INPUT RY PROTECTION RY
Microcomputer
Protection circuit detection
Interruption
±40V Power Amp Current Stage FLAT AMP
±30V Power Amp Current Stage (Full-wave voltage doubler rectifier)
10A(/KU/CA) 4A (/NY)
ATT DATA input
Silent microcomputer
+5V DAC IC
KEY input
MODE SW Protection circuit detection
µ-COM
for Lch
AC ON/OFF information BACK UP RESET
(for Rch same as L ch) LED LED LED Microcomputer
15V 24V + ~
Backup
AC IN
~
EEPROM
RY
5V
24V
AC
M-AX10
55
M-AX10
Each mode of block diagram 12dB IN 2 14dB
+
12dB
+
14dB
RED Low ch BLK RED High ch BLK
+
IN 1
+
DAC VR
Dual Drive Mode
12dB IN 2
14dB
+
12dB
+
14dB
RED BLK RED BLK Full Range
+
IN 1
DAC VR
Bridge Drive Mode
12dB Low ch
14dB
+
12dB
+
14dB
RED Low ch BLK RED High ch BLK
High ch
+
+
DAC VR
Separate Drive Mode
56
M-AX10
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. 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. 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.
Level Diagram
12dB Input 1, 2 Input high, low Input Buffer Amp. 14dB Dual, Separate 20dB Bridge ATT through Speaker Out Power Amp.
ATT ON
0dB (-58dB MIN) DAC VR
40dBV (100Vrms) 30dBV
40Vrms, 32dBV Bridge 20Vrms, 26dBV
20dBV (10Vrms) 10dBV 0dBV (1Vrms) -10dBV
Maximum permission input level with attenuator (4Vrms) 4Vrms, 12dBV
Dual Separate
1Vrms
57
M-AX10
9. PANEL FACILITIES AND SPECIFICATIONS
FRONT SECTION
0 8 ~ 9 =
1
4
3
2
5
6
7
1 POWER
Press to switch the appliance on and off.
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.
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.
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. Panel light initial setting Press once Press twice Press three times Bright Dim Off Off Mode illumination light On On On Off Mode indicator On On On Off
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 b