NAD M-25 Service manual

SERVICE MANUAL

MOD EL: M3SERVICE MANUAL

NAD ELECTRONICS INTERNATIONAL TORONTO

SEVEN CHANNEL AMPLIFIER

M25 C/AH

SERVICE MANUAL

C/AH

M25

SEVEN CHANNEL AMPLIFIER

M25 C/AH

SEVEN CHANNEL AMPLIFIER

CONTENTS

FRONT PANEL/REAR PANELVIEW3 SPECIFICATIONS ALIGNMENT PROCEDURE/ALIGNMENT POINTS5-6 WIRING DIAGRAM SCHEMATIC DIAGRAM8-16 PCB LAYOUT ELECTRICAL PARTS LIST24-40 EXPLODED VIEW EXPLODED VIEW PARTS LIST45 PACKING DIAGRAM

41-44

46

17-23

4

7

SERVICE SAFETY PRECAUTIONS

1. Replacing the Fuses

CAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE

REPLACE ONLY WITH SAME TYPE OF FUSE.

REFERENCE NO. PART NUMBER DESCRIPTION Rear Panel

AH 20-11203-10 MDA T20AL/250V C 20-12103-20 MDA T10AL/250V

AMP Board

F101/F102 20-12632-00 T6.3AL/250V

PSU Board

F201-F204 20-12162-01 T1.6AL/250V

NOTE:

*AH : North American version only *C : European version only

2. Safety-check out (North American model only)

Before returning the product to the customer, make leakage current or resistance measurements to determine that exposed parts are acceptably insulated from the supply circuit.

Parts marked with the symbol are critical with regard to the risk of fire and electric shock.Replace only parts recommended by the manufacturer.

-2-

FRONT PANEL / REAR PANEL VIEW

FRONT PANEL CONTROLS

1. POWER SWITCH

2. POWER INDICATOR

3. SOFT CLIPPING INDICATOR

4. PROTECTION INDICATOR

1. AC INLET

2. INPUT JACK

3. LEVEL CONTROL

4. SPEAKER TERMINALS

5.AUTO TRIGGER SWITCH

6. 12V TRIGGER INPUT

7. SOFT CLIPPING SWITCH

8. MAINS FUSE

9. GROUND TERMINAL

-3-

SPECIFICATIONS

CONTINUOUS AVERAGE POWER 160 W (22.0 dBW) OUTPUT INTO 8 OHMS OR 4 OHMS (Min. power per channel, 20 Hz – 20 kHz, both

channels driven, with no more than rated distortion)

Rated Distortion 0.03% (THD 20 Hz – 20 kHz)

Clipping power 180 W (maximum continuous power per channel).

IHF dynamic power (Maximum short term power per channel)

8 ohms: 220 W (23.4 dBW) 4 ohms: 385 W (25.9 dBW) 2 ohms: 485 W (26.9 dBW)

Damping factor >180 (ref. 8 ohms 50Hz)

Input Impedance R = 1 Mohms

C = 180 pF

Input sensitivity (for rated output into 8 ohms) 1250mV+/-50mV

Voltage gain 29 dB

Frequency response 20 Hz – 20 kHz 0.2 dB

- 3dB at 3 Hz/70 kHz

Signal / Noise ratio, A-weighted >96 dB ref. 1 W

>118 dB ref. 160W

DIMENSIONS AND WEIGHTS

Net Weight 44.5 kg (98.0 Ib) Shipping Weight 53 kg (116.7 Ib) Dimension (W×H×D) 435 × 200 × 465.6mm

-4-

ALIGNMENT PROCEDURE

A. THERMAL SENSE ADJUSTMENT

This adjustment should be always done when the M25 is cool condition. (That means the temperature inside the unit should be almost same as the ambient temperature. Connector P208B that connects the transformer and power board should be removed to avoid that the Idling current heats up the unit excessively) At ambient temperature of 25 C degrees and when the unit is just turned on (still in cool condition), adjust the pot RV103(as marked as “Thermal Sense ADJ” in below drawing) for a voltage between the THERMAL TEST POINT and AGND to be 750mV+/-10mV. If the ambient temperature is different, the voltage setting should be changed by 20mV per degree difference. So at 20C degrees, the voltage should be 850mV+/-10mV; and at 30C degrees, the voltage should be 650mV+/-10mV, etc.

B. DC OFFSET VOLTAGE

The DC OFFSET between OFFSET Test Point and AGND must be within 0+/-3mV. If it’s found to be out of this range, change the TL084BCD to one selected for low offset voltage to meet the requirement.

C. IDLING CURRENT

The idling current in the output stage of the poweramp should be set to 40mA+/-10mA per pnp-npn transistor pair( This means the mid point voltage is 17.6mV with down limit of

13.2mV and up limit of 22mV). The alignment procedure is: At first, adjust RV102 (Marked as “Idling Current ADJ” in the drawing below) for a voltage of 17.6mV +/- 1mV between Testpoint1and2.Thenpre

readjust to 17.6mV +/- 1mV.

Pls note:

1. The idling current must be adjusted when all modules are assembled into the unit.

2. Though the idling current is set as 17.6mV +/-1mV during the adjustment, due to the influence of varied ambient temperature and mains voltage etc., the idling current will drift after some time. During the normal checking of idling current in the service field, it’s acceptable as long as the voltage is in the range of 13.2mV—22.0mV.

heat the unit for 5 minutes, let idling current settled and then

D. ISC Current sense zero-set.

The ISC current-sensing voltage at no signal should be 0mV+/-50mV. During factory alignment, it is set to 0mV+/-10mV . That is to adjust Pot RV104 (as marked as “ISC SENSE ADJ” in the below drawing) to get a voltage between the “ISC SENSE TEST POINT” and AGND to be 0mV+/-10mV.

Pls note the ISC should be adjusted when all modules are plugged in. It’s not possible to get

(

0mV +/-10mV if any of the modules are removed.)

E. Fan Cut Off Point Adjustment

Check the Fan sense voltage first. Turn Pot RV201 to the end clockwise and confirm TP2 of J201 is in negative voltage. Run the unit to heat it up and drive the fan to start turning,

-5-

for example, all 7 channels at 50W/4ohms for 10 minutes or 5 minutes or even less (as long as the fan can starts turning). Turn off the signal but still keep the unit operating for 1 minute. Then run all 7 channels at 1kHz, 0.25W at 4 ohms load, monitor the voltage at TP1 of Pot RV201. Adjust RV201 to get the voltage from negative to positive to ensure that the Fans are turned off. Then run all 7 channels at 1kHz, 0.5W at 4 ohms load, monitor if the voltage at TP1 of Pot RV201 is negative, if not, adjust Pot RV201 just to the point that TP1 changes from positive to negative (to get the fans just start turning). Finally, turn off the signal and monitor if fans stop turning within about 30s Max."

-6-

WIRING DIAGRAM

P101AP101A

P102AP102A

P604BP604B

P611BP611B

1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9

SC NPN SC PNP +18V

-18V +70V

-70V PROTECT SEN AC OFF AGND +62V +62V

-62V

-62V AGND AGND AGND ISC TR IG

SCN_4 SCP_4 +18V

-18V +70V

-70V PROT1 SEN1 ACOFF

+62V_4 +62V_4

-62V_4

-62V_4 AGND4 AGND4 AGND4 ISCTRIG_1

POWERAMP BOARD

P601BP601B

123456789

AGND

SCLED

DGND

PROT7

PROT1

10111213141516

PROT6

PROT2

PROT5

PROT3

PROT4

+8V

P101AP101A

P102AP102A

+8V

P605BP605B

P612BP612B

STBY

1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9

SC NPN SC PNP +18V

-18V +70V

-70V PROTECT SEN AC OFF AGND +62V +62V

-62V

-62V AGND AGND AGND ISC TRIG

SCN_4 SCP_4 +18V

-18V +70V

-70V PROT2 SEN2 ACOFF

+62V_4 +62V_4

-62V_4

-62V_4 AGND4 AGND4 AGND4 ISCTRIG_2

POWERAMP BOARD

P602BP602B

123456789

ISCTRIG_4

ISCTRIG_3

DGND

ISCTRIG_2

ISCTRIG_7

ISCTRIG_6

ISCTRIG_5

P621BP621B

1

FAN1

10111213141516

ISCTRIG_1

SEN5

AGND

SEN4

2

DGND

SEN6

SEN3

SEN7

P101AP101A

P102AP102A

SEN2

P606BP606B

P613BP613B

SEN1

1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9

SC NPN SC PNP +18V

-18V +70V

-70V PROTECT SEN AC OFF AGND +62V +62V

-62V

-62V AGND AGND AGND ISC TRIG

SCN_4 SCP_4 +18V

-18V +70V

-70V PROT3 SEN3 ACOFF

+62V_4 +62V_4

-62V_4

-62V_4 AGND4 AGND4 AGND4 ISCTRIG_3

+62V_4

-62V_4

-62V_4 AGND4 AGND4 AGND4 AGND4

POWERAMP BOARD

1 2 3 4 5 6 7 8

P619BP619B

P101AP101A

P102AP102A

P607BP607B

P614BP614B

1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9

SC NPN SC PNP +18V

-18V +70V

-70V PROTECT SEN AC OFF AGND +62V +62V

-62V

-62V AGND AGND AGND ISC TR IG

SCN_4 SCP_4 +18V

-18V +70V

-70V PROT4 SEN4 ACOFF

+62V_4 +62V_4

-62V_4

-62V_4 AGND4 AGND4 AGND4 ISCTRIG_4

POWERAMP BOARD

P603BP603B

123456789

DGND

+18V

-18V

+70V

ACOFF

P622BP622B

1

2

FAN2

DGND

-70V

FAN3

FAN2

P401BP401B

FAN1

P618BP618B

10

AGND

P101AP101A

SC NPN

1

SC PNP

2

+18V

3

P102AP102A

P608BP608B

P615BP615B

4 5 6 7 8 9 1 2 3 4 5 6 7 8 9

1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9

-18V +70V

-70V PROTECT SEN AC OFF AGND +62V +62V

-62V

-62V AGND AGND AGND ISC TRIG

SCN_3 SCP_3 +18V

-18V +70V

-70V PROT5 SEN5 ACOFF

+62V_3 +62V_3

-62V_3

-62V_3 AGND6 AGND6 AGND6 ISCTRIG_5

POWERAMP BOARD

STBY

1

+8V

2

DGND

3

SCLED

4

SCN_3

5

SCN_4

6

SCP_3

7

SCP_4

8

+62V_3

9

-62V_3

10

+62V_4

11

-62V_4

12

TRIG&SC BOARD

STBY

1

+8V

2

DGND

3

SCLED

4

SCN_3

5

SCN_4

6

SCP_3

7

SCP_4

8

+62V_3

9 10

+62V_4

11 12

-62V_3

-62V_4

+62V_3 +62V_3

-62V_3

-62V_3 AGND6 AGND6 AGND6 AGND6

1 2 3 4 5 6 7 8

P620BP620B

P101AP101A

P102AP102A

P609BP609B

P616BP616B

1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9

SC NPN SC PNP +18V

-18V +70V

-70V PROTECT SEN AC OFF AGND +62V +62V

-62V

-62V AGND AGND AGND ISC TRIG

SCN_3 SCP_3 +18V

-18V +70V

-70V PROT6 SEN6 ACOFF

+62V_3 +62V_3

-62V_3

-62V_3 AGND6 AGND6 AGND6 ISCTRIG_6

POWERAMP BOARD

P101AP101A

SC NPN

1

SC PNP

2

+18V

3

-18V

4

+70V

5

-70V

6

PROTECT

7

SEN

8

AC OFF

9

AGND

1

+62V

2

+62V

3

-62V

4

-62V

5

AGND

6

AGND

7

AGND

8

ISC TRIG

9

P102AP102A

P610BP610B

SCN_3

1

SCP_3

2

+18V

3

-18V

4

+70V

5

-70V

6

PROT7

7

SEN7

8

ACOFF

9 1

+62V_3+62V_4

2

+62V_3

3

-62V_3

4

-62V_3

P623BP623B

1

FAN3

2

DGND

5

AGND6

6

AGND6

7

AGND6

8

ISCTRIG_7

9

P617BP617B

CONNECTION BOARD

POWERAMP BOARD

P206B

+12VD

1

PROT1

2

SCLED

3

PROT2

4

PROT3

5

PROT3

6

PROT4

7

PROT4

8

PROT5

9

PROT5

10

STBYLED

11

PROT6

12

+5VD

13

PROT7

14

DGND

15

DGND

16

FLEX 16PIN 1.0mm

123

ACINACIN

1

2

P503BP503B

123

STANDBY BOARD

1

2

P501BP501B

TO P501B TO P502B

1

2

P207BP207B

ACOUTACOUT

P506BP506B

+5V+5V

4

RELAYRELAY

4

P204BP204B

123456789

DGND

PROT7

AGND

PROT1

SCLED

DGND

1

2

P502BP502B

1

2

10111213141516

PROT6

PROT2

PROT5

PROT3

P504BP504B 1 2

P505BP505B 1 2 3 4

3

PROT4

+8V

P205BP205B

123456789

+8V

STBY

DGND

ISCTRIG_7

ISCTRIG_6

ISCTRIG_4

ISCTRIG_3

ISCTRIG_5

ISCTRIG_2

ISCTRIG_1

SEN5

10111213141516

AGND

SEN4

SEN6

SEN3

SEN7

SEN2

SEN1

+62V_4 +62V_4

-62V_4

-62V_4 AGND4 AGND4 AGND4 AGND4

1 2 3 4 5 6 7 8

P202AP202A

P203BP203B

123456789

DGND

+18V

-18V

+70V

ACOFF

-70V

FAN3

FAN2

FAN1

10

AGND

+62V_3 +62V_3

-62V_3

-62V_3 AGND6 AGND6 AGND6 AGND6

1 2 3 4 5 6 7 8

P201AP201A

+12V

-12V

+18V

-18V

+70V

-70V

+62V_4

-62V_4

+62V_3

-62V_3

+/-12V digital voltage regulators

+/-18V anal og volt age regulators

+/-70V anal og volt age regulators

High current 4 ch annel analog voltage rec tify

High current 3 ch annel analog voltage rec tify

P209BP209B

12345

P208BP208B

12345

POWER SUPPLY BOARD

TO P209B TO P208B

FAN1FAN1

1

2

1 2

TO P504BTO P505B

1 2 3 4

12

P801AP801A

POWER SWITCH BOARD

P301A

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

FLEX 16PIN 1.0mm

+12VD

PROT1

SCLED PROT2 PROT3

PROT3

PROT4

PROT5

PROT5 STBYLED

PROT6 +5VD PROT7 DGND

DGND

LED DISPLAY BOARD

FAN2FAN2

FAN3FAN3

1 2

1

7

8

2

9

3

10

11

4

12

5

13

14

15

tt

6

16

12345

- 7 -

SCHEMATICS DIAGRAM

SEN

62V

+62V

ISC

OFFSET

SEN

62V

+62V

ISCTRIG

OFFSET

R199

R199 220K

220K

6.8V

D129

BAV21

R198

100K

D130

/1/2W

+

4.7V

C148

1uF

D131

/1/2W

F101

T6.3AL/250V

R1A0

390K

R1A1

R1A1 220K

220K

+

D132

BAV21

C149

1uF

R1E1

3.3K

D135

R1E2

500

13

CW

R1E2

33K

R1E3

1.5K

/1%

2

1N5404

R1A7

R1A8

100

6.8K

0.05

R1A7

/3W

Q144

MPSA92

R1E0

R1E0 470K

470K

Q145

2SC4793

RV103

R1A3

470K

+

+12V

+

C150

1uF

R1A4

R1A4 220K

220K

84

5

+

6

-

IC104B

TL082CP

D133

7

1N4148

-12V

R1A2

10K

D134

1N4148

1

IC104A

TL082CP

3

+

2

-

+

C151

1uF

R1A5

220K

-12V

13

CW

RV104

100K

2

Q143

MPSA92

R1A6

47K

R1A9

/1%

+12V

-12V

INPUT

SC NPN

+12V

1

J101

J101 RCA

RCA

TP5

2

R100

470

R10147R101

47

TESTPOINT 5

INPUT

R102

2.2meg

C100

180pF

R103

470

/1KV

R122

100

C101

1nF

Q106

2SC2240

R1041KR104

1K

Q100

2SK170

R10982R109

82

C102

22pF

C107

15pF

/1KV

Q101

2SA970

R1101KR110

1K

/1%

C103

180pF

R111

ATO

/1KV

/1%

R105

2.2meg

C104

1nF

R112

976

/1%

R1061KR106

1K

Q102

2SK170

Q107

2SC2240

R11382R113

82

47pF

C105

/1KV

Q103

2SA970

D100

1N4148

D101

1N4148

R1071KR107

1K

/1%

ISC COMPARATOR

C108

C108 10nF

10nF

R1081KR108

1K

/1%

R114

22K

Q104

2SC2240

R1151KR115

1K

10pF

C106

/1KV

Q105

R116

1.8K

C109

22pF

/1KV

Q108

2SA970

Q109

2SC2240

R11782R117

82

C110

100uF

C111

100nF

RV101

+

5KA

/16V

I/V

13

CW

4

TEMP SEN

Q110

2SC1815

C112

+

1uF

C153

/1KV

470pF

C114

R118

2

470

5

C113

+

1uF

C114

100nF

Q111

2SA1015

R119

2.2meg

C115

1nF

R1201KR120

1K

Q112

2SK170

C116

22pF

/1KV

Q113

2SA970

R1211KR121

1K

-12V

SC PNP

R1G1

100

SMD 0805

C1G1

100nF

SMD 0805

R123

100

G1G1

1

Ground Solder Tap

INPUT BUFFER

All Polyester capacitors are 63V unless noted. All Elec. capacitors are 50V unless noted. All Resistor are 1/6W RJ13 unless noted.

- 8 -

SCHEMATICS DIAGRAM

62V

-12V

+68V

-18V

AGND

ISC

SC NPN

SC PNP

+62V

INPUT

+12V

+18V

-68V

-62V

OFFSET

PROTECT

TP5

SEN

+12V

AC OFF

TO-92 TO-92

e

b

c

2SA970 2SA1015 2SC1815 2SC2240

+68V

-18V-18V

C122

100uF

/25V

AGNDAGND

ISCTRIG

SC NPN

SC PNP

100uF

C118

100nF

C126

C126 100nF

100nF

-68V

-62V

OFFSET

PROTECTPROTECTPROTECTPROTECT

TP5

SEN

2N4403 MPSA42 MPSA92

R1H1

100

C117

+

ec

+

C120

+62V

/16V

AC OFF

b

R124

+

100uF

R1H2

100

10K

C127

IC101

NJM79M12FA

2

O3I

/250V

C154

100nF

+

/100V

10uF

C123

100nF

470nF

C130

G

C157

1

10uF

8

R127

4.7K

R125

680

C119

/1KV

1000pF

IC102

NJM78M12FA

1

/25V

R1H3

10K

2SK170

I

G

2

TO-92

SG

D

3

O

+

10uF

F102

T6.3AL/250V

R183

R183 220K

220K

+

Q141

MPSA92

+

100uF

TO-126 TO-220

e

2SA1360 2SC3423

All Polyester capacitors are 63V unless noted. All Elec. capacitors are 50V unless noted. All Resistor are 1/6W RJ13 unless noted.

-

+

IC103C

TL084BCD

R126

220

C128

C128 10uF

10uF

C155

/100V

R184

20K

C145

/16V

b

+

9

10

+

C158

C158 10uF

10uF

100nF

R185

20K

2SA1837 2SC4793

C124

C125

+

10uF

10nF

R128

1meg

C131

470nF

R129

1meg

C129

10nF

C121

/250V

POWER ON/OFF DETECT

12

13

D121

1N4148

bc

ec

NJM78M12A

R186

1meg

+

-

IC103D

TL084BCD

TO-220

IN

GND

14

OUT

NJM79M12A

R1301KR130

1K

R1311KR131

1K

Q114

2SC2240

RNI1

N.I.

R133

100

Q116

2SC1815

R135

180

R137

180

Q118

2SA1015

R139

100

RNI2

N.I.

Q120

2SA970

R1411KR141

1K

R1421KR142

1K

R187

R187 10K

10K

TO-220

GND

IN

C132

2SC2240

CNI1

Q117

2SC1815

Q119

2SA1015

CNI2

C133

OUT

/1KV

470pF

Q115

N.I.

R134

100

R140

100

N.I.

Q121

2SA970

/1KV

470pF

R188

51K

TO-264

2SA1943 2SC5200

R132

100

R136

22K

R138

22K

R143

100

D106

1N4148

/6.3V

+

C134 1000uF

R145

D108

1N4148

R192

2.21K

/1%

DC OFFSET DETECT

D122

1N4148

D123

1N4148

+

C146

/25V

22uF

ebc

D107

L-513AD

RNI3

N.I.

R144

/1%

100

C156

100nF

CNI3

RNI4

/1KV

15pF

/1%

2.78K

R189

R189 510K

510K

N.I.

RNI5

N.I.

3

2

R191

R190

20K

P101A

MOLEX 41662 RIGHT ANGLE

CONNECT TO CONNECTION BOARD COPPER STRIPS

D102

1N4148

D103

1N4148

R146

R146 100K

100K

R148

R148 100K

100K

D104

1N4148

D105

1N4148

D109

L-513AD

411

+

-

-12V

1 2 3 4 5 6 7 8 9

Q122

2SA970

CNI4

22pF

Q123

2SA1360

Q124

2SC3423

CNI5

22pF

Q125

2SC2240

+12V

1

IC103A

TL084BCD

1 2 3 4 5 6 7 8 9

D110

BAV21

D111

1N4148

/1KV

R147

/1KV

SC NPN SC PNP

-18V

-68V PROTECT SEN AC OFF

C135

47K

68pF

R149

C136

47K

68pF

D116

1N4148

D115

BAV21

D124

1N4148

MOLEX 41662 RIGHT ANGLE

/1KV

P102A

D112

1N4148

CW

2

D117

1N4148

D125

N.I.

1

2

3

4

5

6

7

8

9

D113

1N4148

D114

1N4148

R150

3.9K

C137

100nF

C162

N.I.

2SC3423

R152

1.43K

13

RV102

300

CURRENT DETECT

R193

20K

R194

10K

AGND

+62V +62V+18V

-62V

-62V+68V AGND AGND AGND ISCTRIG

100nF

R1511KR151

1K

Q126

R15333R153

33

100nF

CNI6

CNI7

+

22uF

/250V

C147

R195

R195 100K

100K

Q127

MPSA92

/25V

-12V

CNI8

/1KV

47pF

R15410R154

/1/4W

10

D136

BAV21

Q146

MPSA42

+

C138

/25V

22uF

Q147

MPSA92

D138

BAV21

R15510R155

/1/4W

10

CNI9

/1KV

47pF

D126

1N4148

5

6

D127

1N4148

90deg THERMAL CIRCUITBREAKER

W101

JUMPER

BUS101

COPPER STRIPS

R1N5

220

C160

47nF

C161

47nF

D128

1N4148

220

R1N6

220

C152

1nF

C159

1nF

+

-

+12V

R1N1

220K

R1N2

33K

Q148

MPSA92

Q149

MPSA42

R1N3

33K

R1N4

R1N4 220K

220K

7

IC103B

TL084BCD

MUST USE UL&CSA CERTIFIED

CB101

1 2

Q128

MJE340

R1561KR156

Q129

MJE350

R196

100

+

/1/4W

R157

1K

/1/2W

Q142

2N4403

Q130

2SC4793

R158

2.2

/1W

R159

2.2

/1W

R1N72KR1N7

R1N82KR1N8

D137

1N4148

/1/2W

100

D139

1N4148

R1P12KR1P1

R1P22KR1P2

R160

2.2

2.2 R161

R161

/1W

2.2

Q131

2SA1837

R197

20K

2K

/1W

R1P3

100

R1P4

100

Q132

2SC5200

R162

R163

Q133

2SA1943

Q135

2SA1943

+12V

/5W

0.22

/5W

0.22

Q134

2SC5200

/5W

R164

0.22

OUTPUTOUTPUT

/5W

R165

0.22

D140

BAV21

R1P52KR1P5

+

C139

4.7uF

2K

3.3

R1P62KR1P6

2K

L101

0.7uH

R177

/1W

100nF

C141

/250V

R169

4.7K

R168

22K

D120

R172

10K

Q137

MPSA92

R171

22K

R175

10K

C142

R178

2.7

R180

10K

R182

3.3K

R174

100K

/250V

/2W

P103A

1 2 3 4 5 6

6PIN2.54

22K

Q138

MPSA42

4

180pF

1 2 3 4 5 6

R170

RL101

JQX-115F/024/1HS1

3

1 2

10nF

1N4148

TP2 TP1 SEN OFFSET AGND TP5

IDLING CURRENT SETTING: ADJUST RV102 LET VOLTAGE BETWEEN TP101 AND TP102: 17.6mV FAN&ISC SENSITIVITY SETTING ADJUST RV103 LET VOLTAGE AT SEN PORT: +750mV/25Deg RESISTORS ARE CARBON FILM 1/6W UNLESS SPECIFIED

C144

/1KV

Q139

MPSA92

R173

22K

R176

R176 100K

100K

R181

22K

Q140

MPSA42

D119

1N4148

C140

22nF

R179

N.I.

C143

N.I.

+12V

J103

RED

J104

WHITE

1

G1G2

N.I.

-12V

TP2

TP1

SEN

OFFSET

TP5

AGND

- 9 -

SCHEMATICS DIAGRAM

F201

T1.6AL/250V

BR201

DB104G

~

/100V

C201

10nF

~

/100V

10nF

~

Q218

Q219

Q220

BR202

DB104G

+-

R255

4.7K

C271

100nF

D207

1N4148

+12VD

D208

1N4148

+12VD

D209

1N4148

~

BR205

KBJ2506

+12VD

+

C269

C269 10uF

10uF

+

C270

C270 10uF

10uF

P209B

5P3.96-C

P208B

1 2 3 4 5

5P7.5-C

R228

15K

R229

4.7K

SEN1

SEN2

OFF1

SEN3

SEN4

OFF2

SEN5

SEN6

OFF3

SEN7

ISCTRIG[1..7]

/1/4W

1 2 3 4 5

D206

1N4007

R2A110R2A1

10

R261

10K

R262

10K

R2A4

10K

R263

10K

R2A210R2A2

10

R264

10K

R265

10K

R2A5

10K

R266

10K

R2A310R2A3

10

R267

10K

R268

10K

R2A6

10K

R269

10K

F203

T1.6AL/250V

C210

F204

T1.6AL/250V

F202

T1.6AL/250V

BR204

KBJ2506

/250V

C241

10nF

+18V +18V

R231

10K

R2561KR256

R2301KR230

1K

+

C240

10uF

/100V

/1%

1K

Q229

2SC1815

R2A7

/1%

10K

411

IC203A

TL084CN

3

+

2

-

C272

100nF

C259

1uF

R270

/1%

43K

100nF

R2A8

/1%

10K

5

+

6

IC203B

-

TL084CN

C260

1uF

R271

/1%

43K

C274

100nF

R2A9

/1%

10K

10

+

9

IC203C

-

TL084CN

C261

1uF

R272

/1%

43K

C275

1

C273

7

8

100nF

6.8V

D220

D221

D222

R257

10K

Q230

2SC1815

R273

100

/1/2W

R274

100

/1/2W

R275

100

/1/2W

-12VD

KSC2690AYS

FAN1FAN1

FAN1

C268

C268 10uF

10uF

FAN3FAN3

G2G1

+18V+18V

+70V

HS213

FOR Q220

HS214

FOR IC205

-18V

+62V_4

+62V_3+62V_3

ACIN

DGND ACOUT +5VD RELAY

+8V

DGND

-62V_3

-62V_4

ACOFF

STBY STBY

+8V

+8V PROT4 PROT3 PROT5 PROT2 PROT6 PROT1 PROT7

DGND

DGND SCLED SCLED

DGND

SEN1 SEN2 SEN7 SEN3 SEN6 SEN4

NC

SEN5

DGND

1

Ground Solder Tap

P207A

P207A 1 2 3 4 5 6

6PIN2.0-A100B

STBYLED

STBY

OFF1

OFF2

OFF3

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

+18V

+70V

-70V

-18V

+62V_4

+62V_3

-62V_3

-62V_4

ACOFF

STBY STBY +8V +8V PROT4 PROT3 PROT5 PROT2 PROT6 PROT1 PROT7 DGND DGND SCLED SCLED DGND

SEN1 SEN2 SEN7 SEN3 SEN6 SEN4

SEN5 ISCTRIG_1 ISCTRIG_2 ISCTRIG_3 ISCTRIG_4 ISCTRIG_5 ISCTRIG_6 ISCTRIG_7 DGND

LM7812CT

Q201

Q202

+-

2K

O3I

G

2

1

G

O3I

Q203

2SC1815

Q204

2SA1015

LM7812CT

LM7912CT

R205

100

+

C215

100uF

+

C216

100uF

R206

100

Q231

2SC1815

Q232

2SC1815

C206

100nF

C207

100nF

/35V

R232

10K

J202

2PIN2.54-C

1

2

J203

2PIN2.54-C

1

2

47uF

1.5K

C217

C218

R208

1.5K

+

R207

/25V

C208

C208 10uF

10uF

C209

C209 10uF

10uF

+12VD

-12VD

+

R233

10K

Q210

2SC1815

Q211

2SA1015

R234

10K

R281

R281 10K

10K

/1/2W

C219

R2361KR236

10nF

2SB647

1K

R280

10K

Q212

/100V

10nF

C220

/100V

R2351KR235

2.2nF

R2371KR237

1K

C243

C244

ISCTRIG_5

ISCTRIG_7

ISCTRIG_6

ISCTRIG_4

ISCTRIG_2

ISCTRIG_3

ISCTRIG_1

C221

10nF

/250V

BR203

DB104G

R23847R238

47

/1/2W

3

Q236 30TPS08Q236 30TPS08

12

C245

/250V /250V

2.2nF

C246

/250V /250V

2.2nF

1 2

Q237 30TPS08Q237 30TPS08

3

Q213

2SD667

+12VD

R284 10KR284 10K

R285 10KR285 10K

R286 10KR286 10K

R287 10KR287 10K

R288 10KR288 10K

R289 10KR289 10K

R290 10KR290 10K

R21310R213

/1/2W

10

R214

1.8K

100uF

R215

1.8K

1.8K R216

R216

1.8K

+

/100V

C227

47uF

C232

47uF

/100V

R223

1.8K

R22410R224

/1/2W

10

147

8

IC204A

4.3V

D219

1

2

4

5

IC204A

SN74HC21N

9

C222

~

+-

~

C223

R2391KR239

1K

R24047R240

47

/1/2W

R2911KR291

1K

/80V

+

/250V

C224

10nF

+12VD

+

/250V

C225

10nF

+

C247

/80V

22000uF

+

C248

/80V

22000uF

D213

/1/2W /1/2W /1/2W

4.3V

D216

/1/2W /1/2W /1/2W /1/2W

4.3V

1000uF

/80V

1000uF

4.3V

D217

4.3V

D214

D232

13V

/1/2W

R211

470

C226

C226 10uF

10uF

R222

1.8K

HS207

70-046005-0

FOR BR204&Q236

HS208

70-046005-0

FOR BR205&Q237

R292

10K

13

12

10

D215

4.3V

D218

4.3V

All Polyester capacitors are 63V unless noted. All Elec. capacitors are 50V unless noted. All Resistor are 1/6W RJ13 unless noted.

C228

+

100nF

+

C233

100uF

D212

5.1V

IC204B

/35V

R217

220

D202

1N4148

C229

R225

+

/35V

/1/2W

R293

2SC1775

/100V

2SA872

1.8K

+

10K

6

Q234

2SC1775

Q207

Q209

Q235

2SA872

C267

C267 10uF

10uF

2SC4793

R241

10K

R296

10K

Q205

2SC1775

2SA1837

+12VD

D201

1N4148

Q208

47pF

Q206

R294

R294 10K

10K

Q223

2SC1815

R212

470

R218

2.2K

D204

1N4148

C234

R250

/1KV

470

10K

Q214

2SC1815

Q215

2SA1015

10K

R295

10K

+12VD

2SC1815

R242

R243

R297

R297 10K

10K

Q225

/1/2W

R2451KR245

/1/2W

1K

C230

47pF

R219

220

D203

1N4148

R226

220

Q216

2SB647

2SC1815

R298

10K

/1KV

R2441KR244

2.2nF

R2461KR246

1K

Q224

1K

C249

C250

R220

+

10.2K

C231

10uF

/100V

R221

2.1K

D205

1N4148

+

C235

R227

/100V

10uF

12K

R24747R247

47

/1/2W

3

Q238 30TPS08Q238 30TPS08

12

C251

/250V /250V

2.2nF

C252

/250V /250V

2.2nF

1 2

Q239 30TPS08Q239 30TPS08

3

Q217

2SD667

2

RV201

1K

CW

1 3

R2E11KR2E1

1K

D225

1N4148

7

IC206B

TL082CP

Q226

2SC1815

/1%

/100V

C236

100nF

/100V

C237

100nF

R2481KR248

1K

R24947R249

47

R2E3

180

R2E2

10K

84

+

-

R2E9

20K

C262

220pF

COPPER STRIP

/1/2W

+

100uF

5

6

/1KV

BUS203

BUS204

BUS205

+

C238

10uF

Q240

2SC1775

Q241

2SA872

+

C239

10uF

12

13

C264

/16V

100nF

C266

C266 100nF

100nF

/100V

+

C253

27000uF

+

C254

27000uF

R2E41KR2E4

1K

R2E5

R2E5 100K

100K

+

-

C265

-70V-70V

/80V

IC203D

TL084CN

+12VD

-12VD

+

C276

C276 10uF

10uF

+

C277

C277 10uF

10uF

FOR BR206&Q238

14

-12VD

R2F1

10K

D235

R2H2

10K

3.3V

/1/2W

D236

R2H3

10K

3.3V

/1/2W

BUS206 COPPER STRIPBUS206 COPPER STRIP

HS209

70-046005-0

HS210

70-046005-0

FOR Q239

BUS201 COPPER STRIPBUS201 COPPER STRIP

BUS202 COPPER STRIPBUS202 COPPER STRIP

R2E61KR2E6

1K

J201

J201 2 1

2PIN2.54-C

2PIN2.54-C TEST POINT

D226

R2E71KR2E7

1K

1N4148

R2E8

10K

R2F2

20K

IC206A

D224

TL082CP

1N4148

1

D223

1N4148

R2F3

10K

+12VD

SCLED

PROT3

PROT4

PROT5

STBYLED

+5VD

DGND

FLAT 1mm CONNECTOR

TO FRONT DISPLAY BOARD

D233

1N4148

D234

1N4148

Q233

2SC1815

+

-

P206B

1

3

5

7

9

11

13

15

+12VD

3

2

R2H4

10K

BR208

DB104G

D227

1N4148

D228

1N4148

D229

1N4148

R2F4

10K

C263

100nF

2

4

6

8

10

12

14

16

PROT1

PROT2

PROT3

PROT4

PROT5

PROT6

PROT7

DGND

HS201

70-046006-0

FOR IC201

HS202

70-046006-0

FOR IC202

~

+-

~

C255

2200uF

+12VD

-12VD

/25V

D230

1N4148

D231

1N4148

HS203

70-046006-0

FOR Q201

HS204

70-046006-0

FOR Q202

C256

10nF

/100V /100V

+

Q227

2SD667

R2F50R2F5

0

R2F6

N.I.

HS205

LM7806CT

1

2SC1815

13-13908-00

IC205

O3I

G

2

Q228

C258

P201A

1

2

3

4

5

6

7

8

P202A

1

2

3

4

5

6

7

8

P203A

1 2 3 4 5 6 7 8 9 10

10PIN2.0-A60B

HS205

70-046006-0

FOR Q205

HS206

70-046006-0

FOR Q206

C257

100nF

/100V

10nF

AGND6 AGND6 AGND6 AGND6

-62V_3

-62V_3 +62V_3 +62V_3

AGND1 FAN1 FAN2 FAN3

-70V +70V ACOFF +18V

-18V DGND

R252

R252 100K

100K

AGND4 AGND4 AGND4 AGND4

-62V_4

-62V_4 +62V_4 +62V_4FAN2

R2511KR251

1K

R2531KR253

1K

HS211

70-010003-1

FOR Q218

HS212

70-010003-1

FOR Q219

TO AMP CONNECTION BOARD

70-010003-1

70-046006-0

AC CURRENT SENS

R254

470

P204B

UPSIDE

CONTACTS

FLAT 1mm CONNECTOR

P205B

UPSIDE

ISCTRIG_1 ISCTRIG_2 ISCTRIG_3 ISCTRIG_4 ISCTRIG_5 ISCTRIG_6 ISCTRIG_7

CONTACTS

FLAT 1mm CONNECTOR

IC201

1

+

R2H1

C202

C204

C203

/100V/100V

10nF

BR206

BR207

KBJ2506

/250V

10nF

R282

10K

R283

10K

/35V

+

3300uF

+

3300uF

C204 10nF

10nF

C205

10nF

IC202

KSA1 220AY S

R2011KR201

1K

R203

2.2K

C213

C214

R204

2.2K

R2021KR202

1K

~

R209

10K

Q221

2SC1815

R299

100

R258

10K

Q222

2SC1815

R259

100

2

/35V

KSC2690AYS

R2102KR210

R2602KR260

8.2

/5W

3300uF

+-

+

3300uF

C211

+-

C212

~

+-

C242

~

+12VD

R276

3.3K

3.3K D210

D210

/1/2W

8.2V

R277

3.3K

+12VD

R278

3.3K

D211

/1/2W

8.2V

8.2V R279

R279

3.3K

The J202&J203 links should be shorted during the test for 8ohms load and should be resumed after the test.

- 10 -

SCHEMATICS DIAGRAM

+5VD

P301A

+12VD

1

PROT1

2

SCLED

3

PROT2

4

PROT3

5

PROT3

6

PROT4

7

PROT4

8

PROT5

9

PROT5

10

STBYLED

11

PROT6

12

+5VD

13

PROT7

14

DGND

15

DGND

16

FLEX 16PIN 1.0mm

STBYLED

+12VD

D312

11V

/1/2W

R349

10K

R345

10K

R346

10K

Q333

2SC1815

+

47uF

2SC1815

2SD667

C301

R34356R343

56

STANDBY LED

Q330

D308

SCLED

Q330

2SC1815

Q332

2SA1015

R350

360

Q329

2SA1015

BL-BJLB4274

Q331

D310

1N4148

Q334

D309

BL-BUBB4274

/16V

SOFT CLIPPING LED

R344

120

R347

10K

R3481KR348

1K

R315

10K

R322

10K

R301

510

CH1 LED

Q301

2SA1015

D301

BL-BUBB4274

Q315

2SC1815

Q308

2SC1815

Q322

2SA1015

PROT1

R308

330

R329

10K

R336

10K

STBYLED is +0.7V at normal working condition and is +5V at STNADBY mode. PROT1-PROT7 each is +10.5V at normal working condition.When any channel is in protection,the relevant PROT will be at -10.5V. SCLED is floating at normal working condition,when Softclipping mode, SCLED be connect to GND.

R306

R320

10K

R327

10K

R306

510

Q306

2SA1015

D306

BL-BUBB4274

Q320

2SC1815

Q313

2SC1815

Q327

2SA1015

PROT6

R313

330

R334

10K

R341

10K

R321

10K

R328

10K

R312

R302

510

R309

330

R303

510

R310

330

R304

510

R311

330

R305

510

R312

330

CH2 LED CH3 LED CH4 LED CH5 LED CH6 LED CH7 LED

Q303

R316

10K

R323

10K

Q302

2SA1015

D302

BL-BUBB4274

Q316

2SC1815

Q309

2SC1815

Q323

2SA1015

PROT2

R330

10K

R337

10K

R317

10K

R324

10K

Q303

2SA1015

D303

BL-BUBB4274

Q317

2SC1815

Q310

2SC1815

Q324

2SA1015

PROT3

R331

10K

R338

10K

R318

10K

R325

10K

2SA1015

2SC1815

Q304

2SC1815

D304

BL-BUBB4274

Q318

2SA1015

PROT4

Q311

Q325

R332

10K

R339

10K

R319

10K

R326

10K

Q305

2SA1015

D305

BL-BUBB4274

Q319

2SC1815

Q312

2SC1815

Q326

2SA1015

PROT5

R333

10K

R340

10K

R307

510

Q307

2SA1015

D307

BL-BUBB4274

Q321

2SC1815

Q314

2SC1815

Q328

2SA1015

PROT7

R314

330

R335

10K

R342

10K

All Polyester capacitors are 63V unless noted. All Elec. capacitors are 50V unless noted. All Resistor are 1/6W unless noted.

- 11 -

SCHEMATICS DIAGRAM-

SCLED

SCP_4

+62V_4

-62V_4

SCN_4

SCP_3

SCLED

SCP_4

+62V_4

-62V_4

SCN_4

SCP_3

24V

D401

/1/2W

D402

/1/2W

R401

27K

R402

27K

/1%

R405

/1%

1K

R409

1K

/1%

+

C401

C401 10uF

10uF

+

C402

C402 10uF

10uF

R410

/1%

1K

R406

1K

R407

1K

/1%

1

2

3

7

8

4

5

6

10

11

+62V_3

-62V_3

SCN_3

+8V

STBY

+62V_3

-62V_3

SCN_3

+8V

STBY

24V

D403

/1/2W

D404

/1/2W

R403

27K

R404

27K

/1%

9

R411

1K

/1%

+

C403

C403 10uF

10uF

+

C404

C404 10uF

10uF

R412

/1%

1K

R408

/1%

1K

S401

SSSU142NA1

S402

SSSU122NA1

2

3

12

41

5

6

DGND

12PIN2.0-C

P401B

1 2 3 4 5 6 7 8 9 10 11 12

DGNDDGNDDGNDDGND

STBY +8V DGND SCLED SCN_3 SCN_4 SCP_3 SCP_4 +62V_3

-62V_3 +62V_4

-62V_4

R413

J401

1K

/1%

J401

PY301-030-100

All Polyester capacitors are 63V unless noted. All Elec. capacitors are 50V unless noted. All Resistor are 1/6W unless noted.

- 12 -

SCHEMATICS DIAGRAM

P501B

PCFS250L

P503B

W501

LIVE

1 2

W501

1 2

10mm JUMPER

TR501

1

10

7V

ONLY USED FOR C VERSION

P503B 2 1

2PIN2.54-C

P502B

KY250

1

NEUTRAL

2

C501

100nF/275V

1 2

7.5mm JUMPER

ONLY USED FOR AH VERSION

RV501

0.5R030

Inrush Current Limiter

TR502

1

DHCT3 10A/4mA

CURRENT TRANSFORMER

W503&W504 ONLY FOR AH VERSION W505 ONLY FOR C VERSION

W502

2

t

5

C352 STANDBY TANS

6

0V

TO POWER SWITCH BOARD

P506B

P506B 6 5 4 3 2 1

6PIN2.54-C

FROM POWER SUPPLY BOARD

RL501

832A-1A-C-BH DC5V

2

832A-1A-C-BH DC5V

RL501

2 1

4

3

D501

1N4148

P504B

1 2

2PIN3.96-C

FROM MAIN TRANSFORMER

P505B

12

W503

12

W504

15mm JUMPER

12

W505

15mm JUMPER

7.5mm JUMPER

P505B

4 3 2 1

MOLEX 43160-2104

F1

FUSE HOLDER

U1

AC INLET

W1

14-97301-01

W2

14-97301-02

W3

14-97301-03

W4

14-97301-00

W501&W505

W502,W503&W504

F1 (user accessible fuse)

TO MAIN TRANSFORMER

M25 120V/230V TABLE

NO INSERT

T20AL/250V T10AL/250V

230V120V

INSERT

NO INSERTINSERT

- 13 -

SCHEMATICS DIAGRAM

P601B

FLAT CONNECTOR SMD16

CONTACTS UPSIDE

P601B

P601B1

FLAT CONNECTOR SMD16

CONTACTS UPSIDE

P601B1

P603B

JST2.0-10C SMD

1112

1718

6

7

8

9

10

11

12

13

14

15

16

STBY

+8V

PROT4

PROT3

PROT5

PROT2

PROT6

PROT1

PROT7

DGND

SCLED

AGND

P604B

SCN_4 SCP_4 +18V

-18V -18V +68V

-68V PROT1 SEN1 ACOFF

1 2 3 4 5 6 7 8 9

13-25009-00

BUS601

69-010002-0

1

2

3

SCN_4 SCP_4 +18V

-18V +68V

-68V PROT2 SEN2 ACOFF

1

P605B

1 2 3 4 5 6 7 8 9

13-25009-00

BUS602

69-010002-0

2

SCN_4 SCP_4 +18V

-18V +68V

-68V PROT3 SEN3 ACOFF

3

SEN1

1 2 3 4 5 6 7 8 9

13-25009-00

BUS603

69-010002-0

1

16

14

15

SEN2

SEN7

P606B

2

13

SEN3

1

2

3

4

5

6

7

8

11

12

SEN6

SEN4

3

9

10

AGND

SEN5

ISCTRIG_1

ISCTRIG_2

ISCTRIG_3

SCN_4 SCP_4 +18V

+68V

-68V PROT4 SEN4 ACOFF

2

3

4

5

ISCTRIG_4

ISCTRIG_5

ISCTRIG_6

ISCTRIG_7

P607B

1 2 3 4 5 6 7 8 9

13-25009-00

1

DGND

1718

1

2

3

4

5

6

7

8

9

10

+68V

ACOFF

-18V

+18V

DGND

BUS604

69-010002-0

1

P609B

P608B

SCN_3 SCP_3 +18V

-18V +68V

-68V PROT5 SEN5 ACOFF

2

3

1 2 3 4 5 6 7 8 9

13-25009-00

1

SCN_3

SCP_3

+18V

-18V

+68V

-68V

PROT6

SEN6

ACOFF

BUS605

69-010002-0

2

P609B

1 2 3 4 5 6 7 8 9

13-25009-00

3

SCN_3 SCP_3 +18V

-18V +68V

-68V PROT7 SEN7 ACOFF

1

P610B

1 2 3 4 5 6 7 8 9

13-25009-00

BUS606

69-010002-0

2

3

-68V

FAN3

FAN2

FAN1

AGND

P618A

1 2 3 4 5 6 7 8 9 10 11 12

12PIN2.0-A710B

STBY +8V DGND SCLED SCN_3 SCN_4 SCP_3 SCP_4 +62V_3

-62V_3 +62V_4

-62V_4

+62V_4A

+62V_4B

+62V_4

P611B

+62V_4A +62V_4A

-62V_4A

-62V_4A AGND4A AGND4A AGND4A ISCTRIG_1 ISCTRIG_3 ISCTRIG_5 ISCTRIG_6 ISCTRIG_7

1 2 3 4 5 6 7 8 9

13-25009-00

P621B

2PIN2.54-C

1

2

-62V_4A

-62V_4B

+62V_4B +62V_4B

-62V_4B

-62V_4B AGND4B AGND4B AGND4B ISCTRIG_2

-62V_4

P612B

1 2 3 4 5 6 7 8 9

13-25009-00

AGND4A

+62V_4 +62V_4

-62V_4

-62V_4 AGND4 AGND4 AGND4

AGND4B

AGND4

P613B

1 2 3 4 5 6 7 8 9

13-25009-00

P622B

2PIN2.54-C

1

2

+62V_4 +62V_4

-62V_4

-62V_4 AGND4 AGND4 AGND4 ISCTRIG_4

P614B

1 2 3 4 5 6 7 8 9

13-25009-00

P619B

13-25008-00

+62V_4

1

+62V_4

2

-62V_4

3

-62V_4

4

AGND4

5

AGND4

6

AGND4

7

AGND4

8

2PIN2.54-C

P623B

1

2

P620B

13-25008-00

+62V_3

1 2 3 4 5 6 7 8

+62V_3 +62V_3

-62V_3

-62V_3 AGND6 AGND6 AGND6 AGND6

+62V_3A

+62V_3B

+62V_3 +62V_3

-62V_3

-62V_3 AGND6 AGND6 AGND6

-62V_3

P615B

1 2 3 4 5 6 7 8 9

13-25009-00

-62V_3A

+62V_3A +62V_3A

-62V_3A

-62V_3A AGND6A AGND6A AGND6A

-62V_3B

P616B

1 2 3 4 5 6 7 8 9

13-25009-00

AGND6

+62V_3B +62V_3B

-62V_3B

-62V_3B AGND6B AGND6B AGND6B

AGND6A

AGND6B

P617B

1 2 3 4 5 6 7 8 9

13-25009-00

DGND

FAN1

DGND

FAN2

- 14 -

DGND

FAN3