Nad T-977 Service Manual

LAUNAMECIVRES

REIFILPMA LENNAHC NEVES

HA/C

T977

T977 C/AH

SEVEN CHANNEL AMPLIFIER

CONTENTS

FRONT PANEL/REAR PANEL VIEW．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．． 3 SPECIFICATIONS．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．． 4 ALIGNMENT PROCEDURE/ALIGNMENT POINTS．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．5-6 WIRING DIAGRAM．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．． 7 SCHEMATIC DIAGRAM．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．． 8-15 PCB LAYOUT．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．． 16-21 ELECTRICAL PARTS LIST．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．． 22-37 EXPLODED VIEW．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．． 38 EXPLODED VIEW PARTS LIST．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．． 39 PACKING DIAGRAM．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．． 40

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 -

- 3 -

SPECIFICATIONS

CONTINUOUS AVERAGE POWER ≥140 W (21.5 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 ≥170 W(22.3 dBW) (maximum continuous power per channel).

IHF dynamic power (Maximum short term power per channel)

8 ohms: ≥230 W (23.6 dBW)

4 ohms: ≥390 W (25.9 dBW)

2 ohms: ≥450 W (26.5 dBW)

Time to go to Standby mode at no input signal ≤ 30 minutes

Damping factor >300 (ref. 8 ohms 50Hz)

Input Impedance R = 1 Mohms C = 180 pF

Input sensitivity (for rated output into 8 ohms) 1180mV+/-50mV

Voltage gain 29 dB

Frequency response 20 Hz – 20 kHz ±0.2 dB

- 3dB at 3 Hz/100 kHz

Signal / Noise ratio, A-weighted >96 dB ref. 1 W >125 dB ref. 140W

DIMENSIONS AND WEIGHTS

Net Weight 32.3 kg (71.2 Ib) Shipping Weight 36.5 kg (80.5 Ib)

Dimension (W´H´D) 435 ´ 194 ´ 476mm

- 4 -

ALIGNMENT PROCEDURE (T977)

A. THERMAL SENSE ADJUSTMENT

This adjustment should be always done when the T977 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 Test point 1 and 2. Then preheat the unit for 5 minutes, let idling current settled and then

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.

D. ISC SENSITIVITY

The ISC sensing voltage can allow 0mV+/-50mV. But, for the alignment process in our factory, we tighten the limit 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

P602B

R1A147R1A1

47

10111213141516

AGND

SEN5

ISCTRIG_1

ISCTRIG_2

ISCTRIG_3

ISCTRIG_4

ISCTRIG_5

TRIGGER BOARD

P401B

12PIN2.0-C

STBY

+8V

DGND

SCLED

SCN_3

SCN_4

SCP_3

SCP_4

1234567891011

FROM P618B

1718

123456789

ISCTRIG_6

ISCTRIG_7

DGND

FAN1

P102A

MOLEX 41662

TO P615BTO P608B

P101A

MOLEX 41662

P102A

MOLEX 41662

AGND

9

+62V

8

+62V

7

-62V

6

-62V

5

AGND

4

AGND

3

AGND

2

ISCTRIG

1

AC OFF

9

SEN

8

PROTECT

7

-68V

6

+68V

5

-18V

4

+18V

3

SC PNP

2

SC NPN

1

J101

J101 RCA

RCA

1

2

R1A47R1A

J102

BINDDING POST

1 2

47

MOLEX 41662

TO P616B

TO P609B

P101A

MOLEX 41662

AGND

9

+62V

8

+62V

7

-62V

6

-62V

5

AGND

4

AGND

3

AGND

2

ISCTRIG

1

AC OFF

9

SEN

8

PROTECT

7

-68V

6

+68V

5

-18V

4

+18V

3

SC PNP

2

SC NPN

1

J101

J101 RCA

RCA

1

2

R1A147R1A1

J102

BINDDING POST

1 2

47

+62V_3

-62V_3

+62V_4

-62V_4

12

P102A

MOLEX 41662

TO P613B

TO P606B

P101A

MOLEX 41662

P102A

MOLEX 41662

AGND

9

+62V

8

+62V

7

-62V

6

-62V

5

AGND

4

AGND

3

AGND

2

ISCTRIG

1

AC OFF

9

SEN

8

PROTECT

7

-68V

6

+68V

5

-18V

4

+18V

3

SC PNP

2

SC NPN

1

J101

J101 RCA

RCA

1

2

R1A147R1A1

J102

BINDDING POST

1 2

47

MOLEX 41662

TO P614BTO P607B

P101A

MOLEX 41662

AGND

9

+62V

8

+62V

7

-62V

6

-62V

5

AGND

4

AGND

3

AGND

2

ISCTRIG

1

AC OFF

9

SEN

8

PROTECT

7

-68V

6

+68V

5

-18V

4

+18V

3

SC PNP

2

SC NPN

1

J107

J107 RCA

RCA

1

2

R1A1147R1A11

J102

BINDDING POST

1 2

47

FROM P203B

1112

-18V

+18V

10PIN2.54-C

ACOFF

P603B

123456789

P618B

+70V

STBY

-70V

FAN3

FAN2

FAN1

DGND

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

-62V_3 +62V_4

-62V_4

+62V_4A +62V_4A

-62V_4A

-62V_4A AGND4A AGND4A AGND4A ISCTRIG_1

MOLEX 26-01-1089

1 2 3 4 5 6 7 8

9 10 11 12

12PIN2.0-A580B

P620B

1 2 3 4 5 6 7 8

TO P401B

FROM P201A

P608B

TO CH5 P101A

MOLEX 26-01-1099

P615B

TO CH5 P102A

MOLEX 26-01-1099

1 2 3 4 5 6 7 8 9

SCN_4 SCP_4 +18V

-18V +68V

-68V PROT1 SEN1 ACOFF

+62V_4A +62V_4A

-62V_4A

-62V_4A AGND4A AGND4A AGND4A ISCTRIG_1

P622B

2PIN2.54-C

FAN2

1

DGND

2

P609B

TO CH6 P101A

MOLEX 26-01-1099

P616B

TO CH6 P102A

MOLEX 26-01-1099

1 2 3 4 5 6 7 8 9

SCN_4 SCP_4 +18V

-18V +68V

-68V PROT1 SEN1 ACOFF

+62V_4A +62V_4A

-62V_4A

-62V_4A AGND4A AGND4A AGND4A ISCTRIG_1

P621B

2PIN2.54-C

FAN1

1

DGND

2

P606B

1 2 3 4 5 6 7 8 9

TO CH3 P101A

MOLEX 26-01-1099

P613B

1 2 3 4 5 6 7 8 9

TO CH3 P102A

MOLEX 26-01-1099

SCN_4 SCP_4 +18V

-18V +68V

-68V PROT1 SEN1 ACOFF

+62V_4A +62V_4A

-62V_4A

-62V_4A AGND4A AGND4A AGND4A ISCTRIG_1

+62V_4A +62V_4A

-62V_4A

-62V_4A AGND4A AGND4A AGND4A ISCTRIG_1

MOLEX 26-01-1089

10

SCN_4 SCP_4 +18V

-18V +68V

-68V PROT1 SEN1 ACOFF

+62V_4A +62V_4A

-62V_4A

-62V_4A AGND4A AGND4A AGND4A ISCTRIG_1

DGND

P607B

1 2 3 4 5 6 7 8 9

TO CH4 P101A

MOLEX 26-01-1099

P614B

P619B

1 2 3 4 5 6 7 8

FROM P202A

P614B

TO CH4 P102A

MOLEX 26-01-1099

1 2 3 4 5 6 7 8 9

TO FAN1 TO FAN2 TO FAN3

FAN3

FAN2

FAN3

P623B

2PIN2.54-C

FAN3

1

DGND

2

P102A

MOLEX 41662

9 8 7 6 5 4

TO P617B

3 2 1 9 8

PROTECT

7 6 5

TO P610B

4 3 2 1

P101A

MOLEX 41662

P610B

SCN_4

1

SCP_4

2

+18V

3

-18V

4

+68V

5

-68V

6

PROT1

7

SEN1

8

ACOFF

9

TO CH7 P101A

MOLEX 26-01-1099

P617B

1

+62V_4A

2

+62V_4A

3

-62V_4A

4

-62V_4A

5

AGND4A

6

AGND4A

7

AGND4A

8

ISCTRIG_1

9

TO CH7 P102A

MOLEX 26-01-1099

CONNECTION BOARD

AGND +62V +62V

-62V

-62V AGND AGND AGND

ISCTRIG

AC OFF

SEN

-68V +68V

-18V

+18V SC PNP SC NPN

CHANNEL 1 CHANNEL 2 CHANNEL 3 CHANNEL 4 CHANNEL 5 CHANNEL 6 CHANNEL 7

P102A

MOLEX 41662

AGND

9

+62V

8

+62V

7

-62V

6

-62V

5

AGND

4

TO P611BTO P604B

AGND

3

AGND

2

ISCTRIG

1

AC OFF

9

SEN

8

PROTECT

7

-68V

6

+68V

5

-18V

4

+18V

3

SC PNP

2

SC NPN

1

P101A

MOLEX 41662

POWERAMP MODULE BOARD POWERAMP MODULE BOARD POWERAMP MODULE BOARD POWERAMP MODULE BOARD POWERAMP MODULE BOARD POWERAMP MODULE BOARD POWERAMP MODULE BOARD

J101

J101 RCA

RCA

1

2

R1A147R1A1

47

J102

BINDDING POST

1 2

FROM P204B FROM P205B

CONTACTS UPSIDE

P102A

MOLEX 41662

TO P612B

TO P605B

P101A

MOLEX 41662

AGND

9

+62V

8

+62V

7

-62V

6

-62V

5

AGND

4

AGND

3

AGND

2

ISCTRIG

1

AC OFF

9

SEN

8

PROTECT

7

-68V

6

+68V

5

-18V

4

+18V

3

SC PNP

2

SC NPN

1

J101

J101 RCA

RCA

1

2

J102

BINDDING POST

1 2

CONTACTS UPSIDE

1718

P604B

TO CH1 P101A

MOLEX 26-01-1099

P611B

TO CH1 P102A

MOLEX 26-01-1099

1 2 3 4 5 6 7 8 9

SCN_4 SCP_4 +18V

-18V +68V

-68V PROT1 SEN1 ACOFF

+62V_4A +62V_4A

-62V_4A

-62V_4A AGND4A AGND4A AGND4A ISCTRIG_1

STBY

+8V

PROT4

PROT3

MOLEX 52207-1690

10111213141516

PROT5

P601B

123456789

PROT2

PROT6

PROT1

PROT7

DGND

SCLED

AGND

P605B

TO CH2 P101A

MOLEX 26-01-1099

P612B

TO CH2 P102A

MOLEX 26-01-1099

1 2 3 4 5 6 7 8 9

SCN_4 SCP_4 +18V

-18V +68V

-68V PROT1 SEN1 ACOFF

+62V_4A +62V_4A

-62V_4A

-62V_4A AGND4A AGND4A AGND4A ISCTRIG_1

SEN1

SEN2

SEN7

SEN3

MOLEX 52207-1690

SEN6

SEN4

J101

J101 RCA

RCA

1

2

R1A147R1A1

J102

BINDDING POST

1 2

47

P206B

TO P301A

12PIN2.0-C

1 2

FAN

TO P602BTO P601B

P204B

123456789

PROT2

PROT6

PROT1

PROT7

DGND

SCLED

AGND

P207AP207A

+5VD

DGND

RELAY

AC SENS

234

1

10111213141516

STBY

+8V

PROT4

PROT3

+12VD

1

PROT1

2

PROT2

3

PROT3

4

PROT4

5

PROT5

6

PROT6

7

PROT7

8

SCLED

9

DGND

10

+5VD

11

STBYLED

12

PROT5

FLEX CONNECTOR DIP16

SEN1

SEN2

SEN7

SEN3

SEN6

SEN4

FLEX CONNECTOR DIP16

10111213141516

AGND

TO P506B

FROM P207A

P506BP506B

123

4

1 2

P504B

FROM P2AFROM P1A

2PIN3.96-C

1 2

P501B

PCFS2508

1

2

FROM FUSE

P502B

P502B KY250

KY250

1

FROM AC INLET

3 4

P505B

MOLEX 43160-2104

2

STANDBY BOARD MAIN TRANSFORMER

P205B

SEN5

ISCTRIG_1

ISCTRIG_2

ISCTRIG_3

ISCTRIG_4

ISCTRIG_5

ISCTRIG_6

ISCTRIG_7

123456789

DGND

P202A

+62V_4A

1

+62V_4A

2

-62V_4A

3

-62V_4A

4

AGND4A

5

TO P619B

AGND4A

6

AGND4A

7

ISCTRIG_1

8

MOLEX 41662

TR1

6

17

t

16 15 14

5 4

13 11

3

10

2

9 8

1

7

TO P504BTO P505B

P2A

MOLEX_51144-0200

P1A

MOLEX_44441-2004

2 1

4 3 2 1

120 deg thermal breaker

T973MKII-B MAIN TRANSFORMER

TO P603B

10

DGND

-18V

+18V

10PIN2.54-A60B

ACOFF

P203B

234156789

+70V

-70V

FAN3

FAN2

FAN1

DGND

P201A

+62V_4A

1

+62V_4A

2

-62V_4A

3

-62V_4A

4

AGND4A

5

AGND4A

TO P620B

6

AGND4A

7

ISCTRIG_1

8

MOLEX 41662

1 2 3 4 5

FAN

P4A

5 4 3 2 1

MOLEX_51144-0500

P3A

MOLEX 44441-2005

1 2

TO P4A

TO J901

J204

2PIN2.54

FROM J204

J901

2PIN2.54

ON/OFF

2

STBY

1

ON/OFF

2

STBY

1

12453

15V

P209B

5PIN3.96-C

AGND1

64V

TO P209BTO P208B

TP901

1 2

115deg THERMAL CIRCUIT BREAKER

1 2

FAN

TP902

1 2

115deg THERMAL CIRCUIT BREAKER

TO P3A

12345

38V

AGND2

53V

P208B

MOLEX 43160-2105

POWER SUPPLY BOARD

TP903

1 2

115deg THERMAL CIRCUIT BREAKER

THERMAL PROTECT BOARD

12

TP904

115deg THERMAL CIRCUIT BREAKER

F1

FUSE HOLDER

U4

AC INLETU4AC INLET

W1W1

W2W2

W3W3

P301A

FROM P206B

12P2.0-A350B

+12VD

1

PROT1

2

PROT2

3

PROT3

4

PROT4

5

PROT5

6

PROT6

7

PROT7

8

SCLED

9

DGND

10

+5VD

11

STBYLED

12

DISPLAY BOARD

- 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

BAV21

+

C149

D132

1uF

R1E1

3.3K

D135

R1E2

500

13

CW

R1E2

33K

R1E3

1.5K

/1%

2

1N5404

R1A7

0.05

R1A8

100

R1A9

6.8K

R1A7

/3W

Q144

MMBTA92

R1E0

R1E0 470K

470K

Q145

2SC4793

RV103

R1A3

470K

+

C150

+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

R1A5 220K

220K

-12V

13

CW

RV104

100K

2

Q143

MMBTA92

R1A6

47K

/1%

+12V

-12V

INPUT

SC NPN

+12V

1

J101

J101 RCA

RCA

TP5

TESTPOINT 5

INPUT

R122

100

R1041KR104

1K

Q101

2SA1312

R100

470

2

R10147R101

47

R102

2.2meg

R103

C100

180pF

C101

470

2SC3324

1nF

Q106

Q100

2SK209

R10982R109

82

C102

C102 22pF

22pF

C107

C107 15pF

15pF

R1101KR110

1K

/1%

C103

180pF

R111

ATO

/1%

R105

2.2meg

C104

1nF

R112

976

/1%

R1061KR106

1K

Q102

2SK209

Q107

2SC3324

R11382R113

82

C105

C105 47pF

47pF

Q103

2SA1312

1K

D100

1N4148

D101

1N4148

R1071KR107

/1%

ISC COMPARATOR

C108

C108 10nF

10nF

R1081KR108

1K

/1%

R114

22K

Q104

2SC3324

Q105

2SC3324

R1151KR115

1K

C106

10pF

R116

1.8K

C109

C109 22pF

22pF

Q108

2SA1312

Q109

2SC3324

R11782R117

82

C110

100uF

C111

100nF

RV101

+

5KA

/16V

I/V

13

CW

4

Q110

2SC1815

C112

+

1uF

470pF

C114

R118

2

470

5

C113

+

1uF

C114

100nF

Q111

2SA1015

R119

2.2meg

TEMP SEN

C153

C115

1nF

R1201KR120

1K

Q112

2SK209

C116

C116 22pF

22pF

Q113

2SA1312

R1211KR121

1K

-12V

SC PNP

R1G1

100

C1G1

100nF

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

ISC

TP5

SEN

+12V

AC OFF

+68V

-18V-18V

C122

100uF

AGNDAGND

ISCTRIG

SC NPN

SC PNP

OFFSET

+68V

-18V

AGND

SC NPN

SC PNP

+62V

INPUT

+12V

+18V

-68V

-62V

OFFSET

PROTECT

TO-92 TO-92

e

b

c

2SA970 2SA1015 2SC1815 2SC2240

R1H1

100

/25V

C117

+

100uF

C118

100nF

C126

100nF

-68V

-62V

PROTECT

TP5 SEN

2N4403 MPSA42 MPSA92

e c

/16V

b

+

C120

+62V

R1H2

100

AC OFF

IC101

NJM79M12FA

/250V

C154

100nF

R125

R124

10K

NJM78M12FA

1

+

C127

100uF

680

/25V

+

IC102

I

/100V 10uF

10uF

G

2

O

NJM79M12FA

2

C123

100nF

C130

470nF

R127

4.7K

C119

1nF

3

O

I

G

1

C157

C157 10uF

10uF

8

TL084BCD

+

10uF

F102

T6.3AL/250V

3

-

+

IC103C

R126

220

C128

C128 10uF

10uF

C155

/100V

C124

C125

+

10uF

10nF

R128

1meg

C131

470nF

9 10

R129

1meg

+

C158

C158 10uF

10uF

100nF

C121

/250V

C129

10nF

R192

2.21K

POWER ON/OFF DETECT

R186

R184

R1H3

10K

TO-92

D

2SK170

R183

R183 220K

220K

Q141

MMBTA92

TO-126 TO-220

SG

e

2SA1360 2SC3423

R184

20K

+

100uF

b

C145

/16V

R185

20K

bc

ec

2SA1837 2SC4793

12 13

D121

1N4148

TO-220

NJM78M12A

1meg

+

-

IC103D

TL084BCD

IN

GND

OUT

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

R1301KR130

1K

R1311KR131

1K

Q114

2SC3324

L101

N.I.

R133

100

Q116

2SC1815

R135

180

R137

180

Q118

2SA1015

R139

100

L102

N.I.

Q120

2SA1312

R1411KR141

1K

R1421KR142

1K

/1%

14

R187

R187 10K

10K

TO-220

GND

NJM79M12A

IN

C132

2SC3324

Q117

2SC1815

2SA1015

C133

+

22uF

OUT

470pF

Q115

C165

N.I.

R134

100

Q119

R140

100

C166

N.I.

Q121

2SA1312

470pF

R188

51K

D122

1N4148

D123

1N4148

C146

/25V

2SA1943 2SC5200

R132

100

R136

22K

R138

22K

R143

100

R189

R189 510K

510K

R190

20K

TO-264

eb c

D107

/1%

/1KV

R1E4

100nF

R1E5

R1E6

D107

L-513AD

N.I.

1N4148

R146

R146 100K

100K

Vo

R148

R148 100K

100K

D104

1N4148

D105

1N4148

D109

L-513AD

D106

1N4148

/6.3V

+

C134 1000uF

R145

D108

1N4148

R144

100

C156

15pF

C143

/1%

2.78K

DC OFFSET&CURRENT DETECT

3 2

R191

100K

C173

100nF

P101A

MOLEX 41662 RIGHT ANGLE

CONNECT TO CONNECTION BOARD COPPER STRIPS

D102

D103

+

-

-12V

1 2 3 4 5 6 7 8 9

2SA1312

2SA1360

R179

4.7K

2SC3423

2SC3324

411

IC103A

TL084BCD

1 2 3 4 5 6 7 8 9

Q122

Q123

R147

47K

R149

47K

Q124

Q125

+12V

D111

1N4148

C174

/1KV

47pF

C167

N.M.

C135

C135 68pF

68pF

C175

/1KV

47pF

C176

/1KV

47pF

C168

N.M.

D116

1N4148

BAV21

D124

1N4148

1

SC NPN SC PNP

-18V

-68V PROTECT SEN AC OFF

MOLEX 41662 RIGHT ANGLE

D110

BAV21

D112

1N4148

C136

C136 68pF

68pF

13

CW

2

D117

1N4148

D115

+12V

C163

/100V

220nF

10uF/100V Non-Pol

R167

20K

P102A

1

2

3

4

5

6

7

8

9

D113

1N4148

D114

1N4148

R150

3.9K

C137

100nF

C162

N.I.

R152

1.3K

RV102

300

R195

R195 100K

100K

R194

150

2SC3423

/1%

SIGNAL

+62V +62V+18V

-62V

-62V+68V AGND AGND AGND ISCTRIG

R166

R166 3meg

3meg

R1511KR151

1K

Q126

R15333R153

33

100nF

C170

R193

+

22uF

/250V

20K

C147

C169

100nF

Q127

MPSA92

/25V

-12V

/250V

C171

/1KV

47pF

R15410R154

/1/4W

10

D136

BAV21

Q146

MMBT5551

+

C138

/25V

22uF

Q147

MPSA92

D138

BAV21

R15510R155

/1/4W

10

C172

/1KV

47pF

Volume Setted to Max. 20Hz/5mV

D126

1KHz/2.5mV

1N4148

20KHz/5mV

5

+

6

-

D127

1N4148

W101

JUMPER

BUS101

COPPER STRIPS

R1N5

220

C160

47nF

C161

47nF

220

R1N6

220

R1E7

330

R1561KR156

R197

20K

MJE340

MJE350

R1N1

330K

C152

1nF

R1N2

33K

Q148

MMBTA92

Q149

MMBT5551

R1N3

33K

C159

1nF

R1N4

R1N4 330K

330K

D128

7

IC103B

1N4148

TL084BCD

CERTIFIED COMPONENT

90deg THERMAL CIRCUIT BREAKER

1N4148

CB101

1 2

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

Q128

/1/4W 1K

Q129

Q142

MMBTA92

Q130

2SC4793

2.2

1N4148

R157

1N4148

2.2

Q131

2SA1837

R158

/1W

R159

/1W

R1N72KR1N7

R1N82KR1N8

D137

/1/2W 100

100

D139

R1P12KR1P1

R1P22KR1P2

R160

/1W

R161

/1W

+12V

+

C139

4.7uF

Q134

2SC5200

Q132

2SC5200

D140

BAV21

2K

/5W

0.22

/5W

0.22

/1/2W

P103A

CON2X3

R1P52KR1P5

2K

2 4 6

3.3

R1P62KR1P6

2K

SIGNAL

TP1 OFFSET TP5

/5W

R164

R162

0.22

100

C164

100nF

0.22

/5W

R163

0.22

Q133

2SA1943

Q135

2SA1943

R196

/1/2W

TP2 SEN AGND

4.7V

R165

D141

1 3 5

R1P3

R1P4

2K

L103

0.7uH

0.7uH R177

R177

/1W

100nF

C141

R169

R168

Vo

/250V

4.7K

22K

D120

TP1 TP2

R172

10K

Q137

MMBTA92

R171

22K

R170

22K

Q138

MMBT5551

R174

R174 100K

100K

R175

10K

RL101

JQX-115F/024/1HS1

3

4 1 2

C142

/250V

10nF

R178

/2W

2.7

R180

10K

1N4148

R182

3.3K

C144

180pF

/200V

MMBTA92

Q139

R173

22K

R176

R176 100K

100K

BINDDING POST

2 1

R181

22K

Q140

MMBT5551

TP2

TP1

SEN

OFFSET

TP5

AGND

D119

1N4148

C140

22nF

BP101

-12V

- 9 -

SCHEMATICS DIAGRAM

F201

T1.6AL/250V

F203

T1.6AL/250V

P209B

1 2 3 4 5

5P3.96-C

F204

T1.6AL/250V

F202

T1.6AL/250V

P208B

1 2 3 4 5

MOLEX 43160-2105

D206

1N4007

R228

/1/4W

15K

R229

/1/4W

4.7K

R2A110R2A1

10

R261

SEN1

10K

R262

SEN2

10K

R2A4

OFF1

10K

R263

SEN3

10K

R2A210R2A2

10

R264

SEN3

10K

R265

SEN4

10K

R2A5

OFF2

10K

R266

SEN5

10K

R2A310R2A3

10

R267

SEN5

10K

R268

SEN6

10K

R2A6

OFF3

10K

R269

SEN7

10K

ISCTRIG[1..7]

+18V

R231

R231 10K

10K

R2551KR255

R2301KR230

1K

+

C240

/100V

10uF

/1%

10

/1%

1K

Q229

2SC1815

R2A7

/1%

10K

411

IC203A

TL084CN

3

+

1

2

-

C272

100nF

100nF C259

C259

1uF

R270

/1%

43K

C273

100nF

R2A8

/1%

10K

5

+

7

6

IC203B

-

TL084CN

C260

1uF

R271

/1%

43K

C274

100nF

R2A9

/1%

10K

+

8

9

IC203C

-

TL084CN

C261

1uF

R272

/1%

43K

C275

100nF

6.8V

C241

D220

D221

D222

+18V

R273

100

/1/2W

R274

100

/1/2W

R275

100

/1/2W

KBJ2506

KBJ2506 /250V 10nF

10nF

R256

10K

Q230

2SC1815

-12VD

BR204

R2571KR257

1K

/100V

C201

10nF

/100V

C210

10nF

~

+-

~

C271

100nF

Q218

KSC2690AYS

D207

+12VD

Q219

KSC2690AYS

D208

+12VD

Q220

KSC2690AYS

D209

BR201

DB104G

BR202

DB104G

1N4148

BR205

KBJ2506

+12VD

FAN1FAN1

FAN1

+

C276

C276 10uF

10uF

FAN2

+

C277

C277 10uF

10uF

FAN3FAN3

+

C278

C278 10uF

10uF

G2G1

+18V+18V +70V

HS213

FOR Q220

-70V

-18V

+62V_4 +62V_3

4PIN2.54-A100B

-62V_3

-62V_4 ACOFF

P204B

10 12 14 16

1

Ground Solder Tap

P207A

1 2 3 4

J204

2 1

2PIN2.54-C

OFF1 OFF2 OFF3

STBYLED

2

+5VD

4

PROT3

6

PROT2

8

PROT1 DGND SCLED POWER

2 4 6 8

ISCTRIG_2 ISCTRIG_4 ISCTRIG_6

+18V +70V

-70V

-18V

+62V_4 +62V_3

CONNECT TO

-62V_3

-62V_4 ACOFF

SEN2 SEN3 SEN4 SEN5

DGND

STANDBY BOARD

THERMAL BOARD

LM7812CT

IC201

C242

/35V

/100V/100V 10nF

10nF

BR206

BR206 BR207

BR207

KBJ2506

R282

10K

R283

10K

10nF

/250V 10nF

10nF

IC202

+

C204

1

/100V

C205

/100V

2

R2011KR201

1K

R203

C213

3300uF

C214

3300uF

R204

R2021KR202

1K

R209

10K

Q221

2SC1815

R299

100

R258

10K

Q222

2SC1815

R259

100

~

+-

+

C202

~

C202

3300uF

+

C203

3300uF

C211

+-

C212

~

+-

~

+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

O3I

G

2

1

G

O3I

Q201

KSA1220AYS

2.2K

/35V

2.2K

Q202

KSC2690AYS

~

+-

~

R2102KR210

2K

R2602KR260

2K

LM7812CT

LM7912CT

Q203

2SC1815

Q204

2SA1015

Q231

2SC1815

Q232

2SC1815

R205

100

+

C215

100uF

+

C216

100uF

R206

100

2PIN2.54-C

J201

1

J202

1

C206

100nF

C207

100nF

/35V

2

R232

10K

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

1K

/100V 10nF

10nF

C220

10nF

Q212

2SB647

R280

10K

/100V

2.2nF

R2371KR237

C221

/250V

10nF

BR203

DB104G

R23847R238

47

R2351KR235

1K

Q236 30TPS08Q236 30TPS08

C243

/250V /250V

C244

/250V /250V

1 2

Q237 30TPS08Q237 30TPS08

1K

+12VD

ISCTRIG_5 ISCTRIG_7 ISCTRIG_6

ISCTRIG_4 ISCTRIG_2 ISCTRIG_3 ISCTRIG_1

~

3

12

C245

2.2nF

C246

2.2nF

3

Q213

2SD667

R2911KR291

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

1.8K C228

C228

+

/35V

100uF

R215

1.8K

1.8K R216

+

R22410R224

4.3V

/1/2W

D219

147

1 2 4 5

C227

47uF

47uF R223

R223

1.8K

R216

1.8K

+

/100V 47uF

47uF

C232

/100V

8

IC204A

SN74HC21N

100nF

+

C233

100uF

D212

5.1V

IC204B

R217

220

D202

1N4148

C229

R225

+

/35V

/1/2W

R293

/100V

1.8K

10K

6

1K

+

/100V

/250V

C224

C222

10nF

1000uF

+12VD

+ -

+

/100V

/250V

C225

C223

R2391KR239

1K

R24047R240

47

1000uF

10nF

+

C247

/100V

10000uF

+

C248

/100V

10000uF

D213

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

4.3V

D216

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

4.3V

70-010002-2

FOR BR204&Q236

70-010002-2

FOR BR205&Q237

D214

4.3V

D217

13V

13V R211

R211

470

HS207

HS208

4.3V

D237

C226

C226 10uF

10uF

R222

1.8K

R292

10K

4.3V

D218

/1/2W

D215

10

13 12 10

9

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

Q234

2N5551

Q207

2N5551

Q209

2N5401

+

Q235

2N5401

C279

C279 10uF

10uF

R296

Q205

2SC4793

2SA1837

R241

10K

+12VD

10K

D201

1N4148

Q208

2N5551

Q206

R294

R294 10K

10K

Q223

2SC1815

R212

470

R218

2.2K

D204

1N4148

C234

47pF

R250

/1KV

470

R242

10K

Q214

2SC1815

Q215

2SA1015

R243

10K

R295

R295 10K

10K

+12VD

2SC1815

/1/2W

R297

R297 10K

10K

Q225

/1/2W

R2451KR245

1K

47pF

R226

C230

R219

220

D203

1N4148

220

Q216

2SB647

2SC1815

R298

R298 10K

10K

/1KV

R2441KR244

2.2nF

R2461KR246

Q224

1K

C249

C250

1K

R220

10.2K

+

C231

/100V

10uF

R221

2.1K

D205

1N4148

R227

/1%

12K

+

C235

/100V

10uF

R24747R247

47

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%

R2E3

180

C236

C237

R2481KR248

R2E2

1K

10K

84

+

-

220pF

+

/100V

C238

10uF

100nF

Q241

2SC1815

Q242

2SA1015

+

/100V

C239

10uF

100nF

R24947R249

47

R2E61KR2E6 1K

R2E41KR2E4

1K

12 13

+

C264

C264 100uF

100uF

5 6

R2E9

20K

C262

/1KV

BUS203

COPPER STRIP

BUS204

COPPER STRIP

BUS205

COPPER STRIP

/100V

+

15000uF

+

15000uF

R2E5

100K

+

-

C280

100nF

C281

C281 100nF

100nF

C253

C254

IC203D

TL084CN

+12VD

-12VD

/100V

HS201

70-046006-0

D235

D233

R2H2

10K

+

C283

C283 10uF

10uF

+

C284

C284 10uF

10uF

R2H3

10K

D232

R2F8

560

L-513AD

R2F7

10K

D226

14

1N4148

J203

2 1

2PIN2.54-C

TEST POINT

D224

1N4148

R2F1

R2F1 10K

10K

D233

1N4148

/1/2W

3.3V

D236

D234

1N4148

/1/2W

3.3V

BUS206 COPPER STRIPBUS206 COPPER STRIP

70-010002-2

FOR BR206&Q238

70-010002-2

FOR Q239

BUS201 COPPER STRIPBUS201 COPPER STRIP BUS202 COPPER STRIPBUS202 COPPER STRIP

Q240

2SC1815

R2E71KR2E7

1K

IC206A

TL082CP

1

D223

1N4148

R2F3

R2F3 10K

10K

P206B

CONNECT TO DISPLAY BOARD

FLEX CONNECTOR DIP16

HS209

HS210

Q233

2SC1815

R2F2

R2F2 20K

20K

+

-

+12VD

-12VD

3 2

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

R2H4

10K

R2E8

10K

1N4148

PROT5 PROT6 PROT4 PROT7 +5VD +5VD +12VD +12VD DGND DGND STBYLED SCLED PROT3 PROT1 PROT2 POWER

D227

D228

D229

R2F4

R2F4 10K

10K

C282

C282 100nF

100nF

FOR IC201

HS202

70-046006-0

FOR IC202

+12VD

1N4148

-12VD

D230

D231

HS203

70-046006-0

FOR Q201

HS204

70-046006-0

FOR Q202

Q227

2SD667

P201A

HEADER 8

R2F50R2F5

0

P202A

R2F6

N.I.

HEADER 8

HEADER 10

CONNECT TO AMP MODULE VIA CONNECTION BOARD

P203B

HS205

70-046006-0

FOR Q205

HS206

70-046006-0

FOR Q206

Q228

2SC1815

AGND6

1

AGND6

2

AGND6

3

AGND6

4

-62V_3

5

-62V_3

6

+62V_3

7

+62V_3

8

AGND4

1

2

AGND4

3

AGND4

4

-62V_4

5

-62V_4

6

+62V_4

7

+62V_4

8

DGND

1

FAN1

2

FAN2

3

FAN3

4

-70V

5

+70V

6

ACOFF

7

+18V

8

-18V

9

DGND

10

+5VD

+

C258

10uF

HS211

70-010003-1

FOR Q218

HS212

70-010003-1

FOR Q219

AC CURRENT SENS

R2531KR253

1K

R252

R252 100K

100K

STBY +5VD PROT4 PROT5 PROT6 PROT7 DGND THERMAL

SEN1 SEN7AGND4 SEN6

AGND ISCTRIG_1 ISCTRIG_3 ISCTRIG_5 ISCTRIG_7

70-010003-1

DGND +5VD RELAY

THERMAL STBY

1 3 5 7 9 11 13 15

CON16A

P205B

1 3 5 7 9 11 13 15

CON16A

- 10 -

SCHEMATICS DIAGRAM

+5VD

STBYLED

+12VD

Q334

PXT2222A

Q329

DTA114EKA

R343

330

AMBER BLUE

R344

470

LED Pin1 Red Pin3 Amber Pin4 Blue

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.

D308

1 3 4

Tri LED

2

P301B

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

FLEX CONNECTOR DIP16

PROT5 PROT6 PROT4 PROT7 +5VD +5VD +12VD +12VD DGND DGND STBYLED SCLED PROT3 PROT1 PROT2 POWER

11V

D312

/1/2W

Q333

2SC1815

R349

10K

S301

IT-1102D-1160

1 23 4

POWER

+

47uF

C301

/16V

D309

BL-BUBB4274

R350

360

SCLED

SOFT CLIPPING LED

R315

10K

R322

10K

R301

510

Q301

2SA1015

D301

BL-BUBB4274

Q315

2SC1815

Q308

2SC1815

Q322

2SA1015

PROT1

R308

330

R329

10K

R336

10K

R302

510

R309

330

R303

510

R310

330

R304

510

R309

CH2 LED CH3 LED CH4 LED CH5 LED CH6 LED CH7 LEDCH1 LED

Q304

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

Q304

2SA1015

D304

BL-BUBB4274

Q318

2SC1815

PROT4

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

Q311

2SC1815

Q325

2SA1015

R311

330

R332

10K

R339

10K

R319

10K

R326

10K

R305

510

Q305

2SA1015

D305

BL-BUBB4274

Q319

2SC1815

Q312

2SC1815

Q326

2SA1015

PROT5

R312

330

R333

10K

R340

10K

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

R307

510

Q307

2SA1015

D307

BL-BUBB4274

Q321

2SC1815

Q314

2SC1815

Q328

2SA1015

PROT7

R314

330

R335

10K

R342

10K

- 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

26.1K

R402

26.1K

/1%

+

C401

10u

+

10u

R405

1K

/50V

C402

/50V

R406

1K

R407

1K

/1%

R409

1K

R410

1K

/1%

S401

1 2 3 7 8

4 5 6 10 11

+62V_3

-62V_3

SCN_3

TRIG IN

TRIG EN

DGND

+62V_3

-62V_3

SCN_3

TRIG IN TRIG EN DGND

24V

D403

/1/2W

D404

/1/2W

4.7V

D405

/1/2W

R403

26.1K

R404

26.1K

/1%

R414

1K

/1%

+

C403

10u

+

10u

/50V

C404

/50V

R408

1K

R413

10K

/1%

R415

1K

/1%

R411

1K

R412

1K

/1%

9

SSSU142NA1

J401

1 2 3 4 5

PHONEJACK

12

P401B

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

12PIN2.0-C

TRIG EN PULL-UP with 47K resistor connect to MCU Port

TRIG IN TRIG EN DGND SCLED SCN_3 SCN_4 SCP_3 SCP_4 +62V_3

-62V_3 +62V_4

-62V_4

- 12 -