C Audio [PDF]

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C5 4p7

CIRCUIT SHOWN

CMRR

TOP R1 3k3

R3 10k

I/P + A

RV1 1k

C2 33p

C3 33p

R7 220R

C7 100u

R8 10k

R36 110k

6

3

C4 10p

ARE NOT FITTED AND

F

BRIDGE OUT

0dB Sensitivity Modification

7

8

R5 3k3

APPLIES TO ST600

FOR ST400 TR4 & TR8 R10 = 12k R19 & R20 = 30k

R9 120k

1

R2 3k3 C1 82p

C6 100u

2

R4 3k3

I/P 0V

WIPER

+15 4

I/P - A

NOTE

C20 15p

R6 6k2

5

IC1A NE5532

BOTTOM

Change R5 from 3k3 to 6k65 Change R6 from 6k8 to 13k

IC1B NE5532

-15

E

FS2 T10A

+15 R13 10k

C13 deleted

R15 150R

C71 10p

C70 10p

C69 10p

C68 10p

R30 560R

D2 IN4148

R27 560R

R28 560R

+VE A

D6 IN4004

R29 560R

R31 10k 2.5W C15 4700u

R22 5k1

TR10 BC184L BIAS RV2 1k

C8 10u

C11 100u

R10 10k

C18 100n

7

6

C9 4p7

R21 5k1

4

D3 R19 39k

ZD1 9v1

C10 100p

D4 IN4148

IN4148

TR9 BC214L

2

TR6 K1058

TR7 K1058

OP/A

L1 CHOKE

CMOD 220p 1kV

D41 IN4004

RL1

TR8 K1058 +15

C61 680p

C60 680p

R35 10R 2.5W

R108 10R 2.5W

R34 10R

D9 IN4148

C

RMOD 390k C16 47n

R120 8k2

C17 22n

OP/A 0V

D40 IN4004

SEE NOTE

TR1 J162

TR2 J162

TR3 J162

TR4 J162

R17 5k1 R12 68k

R33 10R 2.5W

SEE NOTE

R18 5k1

IC2 NE5534

3

R121 8k2

R20 39k ZD2 9v1

DMOD1 IN4148 x2

TR5 K1058

D

RL4

C/T A

C14

R11 1k

4700u C19 100n

D1 IN4148

R23 560R

R24 560R

R25 560R

R26 560R

D5 IN4004 R14 10k -15

B

R32 10k 2.5W RLY CNTRL

R16 150R C12 deleted

FS1 T10A

-VE A

OP/A MON Title Size A3 Date: File:

ST 600/400 PCB C1022 3

Number

1-Jul-1999 D:\PROTEL\ST\MAINA.SCH

Revision

Sheet of Drawn By:

3

4 LMB

A

C25 4p7

R37 3k3

CMRR

R39 10k

CIRCUIT DIAGRAM

TOP

+15 RV3 1k

4

5

I/P + B

C26 100u

WIPER

STEREO OUT

BRIDGE IN

R43 220R

R45 120k C27 100u

R44 10k

7

3

6

C21 82p

I/P 0V

C22 33p

C23 33p

8

R41 3k3

C24 10p

ST600

F

FITTED

0dB Sensitivity Modification

1

R40 3k3

2

IC3B NE5532

BOTTOM

Change R41 from 3k3 to 6k65 Change R42 from 6k8 to 13k

4

R38 3k3

SHOWN APPLIES TO

FOR ST400 : TR14 & TR18 ARE NOT R46 = 12k R55 & R56 = 30k

8

I/P - B

NOTE

C28 15p

R42 6k2

-15

IC3A NE5532

E

FS4 T10A

+15 R49 10k

C67 10p

C36 Deleted

R51 150R D11 IN4148

C66 10p

R63 560R

C65 10p

R64 560R

+VE B

C64 10p

R65 560R

D15 IN4004

R66 560R

R68 10k 2.5W

D

C38 4700u TR15 K1058

R58 5k1 BIAS RV4 1k

C29 10u

TR20 BC184L

ZD4 9v1

DMOD2 1N4148 x2

R46 10k

C34 100u

C31 100n

CMOD 220p 1kV

D42 IN4004

R57 5k1

D13

4

R55 39k

ZD3 9v1

C32 100p

D12 IN4148

TR9 BC214L

6

RL2

L2 CHOKE +15

C62 680p

R69 10R 2.5W

RMOD 390k

C63 680p

R109 10R 2.5W

C39 47n

R71 10R

D18 IN4148

C40 22n

TR11 J162

SEE NOTE

TR12 J162

TR13 J162

C

OP/B 0V

D43 IN4004

R123 8k2

TR14 J162

R53 5k1

RL4

C37 R47 68k

OP/B

SEE NOTE

R54 5k1

IC4 NE5534

2

C30 4p7

R122 8k2

TR17 K1058

TR18 K1058

IN4148

7 3

R56 39k

TR16 K1058

R70 10R 2.5W

R48 1k

C/T B

4700u C33 100n R50 10k

D10 IN4148

R59 560R

R52 150R

R61 560R

R62 560R

D14 IN4004

C35 -15

R60 560R

Deleted

B

R67 10k 2.5W

RLY CNTRL

FS3 T10A

-VE B

OP/A MON Title Size A3 Date: File:

STi 600/400 PCB C1022 3

Number

1-Jul-1999 D:\PROTEL\ST\MAINB.SCH

Revision

Sheet of Drawn By:

2

4 LMB

A

+15

F

C44 10u

R83 220k

THERMAL/A

-15

D24 IN4148

D22

R79 10M

R72 47k

D19 IN4148

R77 470k

IC5A LM339

R88 3k

5

7

E

6

PEAK A

C42 470n

C43 470n

12

R74 1M

TR21 BC214L

1

2

C41 1uF

ZD9 6V8 IC5B LM339

R78 470k

D21 IN4148

4

R73 4k7

IN4148

R81 10M

D20 IN4148 3

R75 18k

O/P

RLY CONT A

o 112 C N/C

+15

MON A

R84 470k

R80 470k

ZD5 12v

C45 100p

R82 470k

R76 11k

-15

THERMAL A / ZD6 12v

-15 SEE NOTE

RLY CONT B D +15 -15

D26 IN4148

IC5C LM339 MON B O/P

R89 47k

D25 IN4148

R94 3k

9

R95 470k

PEAK B

ZD10 6V8

R97 10M

R100 10M

D29 IN4148

R96 470k

IC5D LM339 11

TR22 BC214L

13

14

10

8 D27 IN4148 R90 4k7

C47 470n

R91 1M

C46 1uF

C48 470n

R98 470k

ZD7 12v

C50 100p

R101 470k

C

-15 ZD8 12v

R110 56R FAN +

AC 1 18V

D31 IN4004

SG64

+15V

3

C51 470u

OV

C53 100u

BRIDGE LED

1 2 D35 IN4004

Vin IC7 MC7915T

NOTE: CIRCUIT SHOWN APPLIES TO THE ST600 VERSION

C54 100u

GND

AC 2 CON

LIVE OUT

BRIDGE SW1 BRIDGE SW2

C52 470u

LIVE IN

R107 1k5 0V

D34 IN4004

B

LED COMMON

2

D33 IN4004

Vin GND

1

SOFT START

+15

IC6 MC7815T

-15V

POWER LED

FOR THE ST400 R76 = 7k5

R106 3k

3

FAN Title -15 Size A3 Date: File:

STi 600 / 400 PCB 3 C1022 Number

1-Jul-1999 D:\PROTEL\ST\MAIN1.SCH

Revision

Sheet of 1 Drawn By:

4 LMB

A

F

FEEDBACK

+ MT

BRIDGE OUT

R80A 30k

R85A 2K2

R17A 3k3/5W

E

C14A 100uF R22A 4k7

R27A 100k

ZD4A 30V

C15A 100uF

6

IC1B NE5532

C12A 100uF

C17A 10p

TOP

R9A 3k3

C13A 100uF

R15A 220R

R11A 3k3

SCN

C7A 82p

2

WIPER

C8A 33p C9A 33p

R13A 3k3

C52A 47p

C10A 10p

BOTTOM GND

C31A 100uF

4

5

C54A 1n

IC1A NE5532 1

3

R18A 680R

R66A 8k2

R64A 150R

8

R20A 120k

7 BLUE

D1A IN4148

D25A IN4148

R14A 6k2 R12A 10k

SC1A

C29A 100uF

R83A 100R

ZD5A 15V

RV1A

R10A 3k3

ZD12A 12V

GT2A GND

RED

ZD8A 15V

R21A 1k5

GT1A

D13A BAV21

+15

C11A 4p7

R28A 330R

R23A 10k

D26A IN4148

C16A 100uF

-15

R72A 8k2

D11A BAV21 D

TR18A BC214L

VR2A 1k

ZD10A 12V

C32A 680p

D9A IN4148

R68A 2k7

C23A 100p

GND

C55A 1n

R69A 2k7

ZD11A 12V

D22A IN4148

TR19A BC184L R65A 150R

R71A 82k

R73A 8k2

D12A BAV21

C24A 100p

C

R67A 8k2

D2A IN4148

+ MT

FEEDBACK C33A 680p

R84A 100R C18A 100uF

R70A 82k

GT3A

R16A 330k

ZD6A 15V

R25A 1k5

C22A 47p ZD9A 15V

C30A 100uF

R31A 330R

C19A 100uF R24A 4k7

R82A 33k RV3A 220k

ZD7A 30V C53A 680n

R26A 3k3/5W

D14A BAV21

R30A 100R

ZD13A 12V

SC2A

C21A 100n

GT4A B

R29A 100k - MT

R81A 33k

R19A 330k

- MT

Title

CHANNEL A DRIVER STAGE C1048 1 Size

Number

Revision

A3

Date: File:

1-Jul-1999 D:\PROTEL\ST\ST1000\C1048.S03

Sheet of Drawn By:

3

5 LMB

A

F

FEEDBACK

+ MT

R17B 4k7

E

C14B 100uF R22B 4k7

R27B 100k

ZD4B 30V

C15B 100uF

RV1B

6

IC1B NE5532 7

R15B 220R

8

C54B 1n

1

C31B 100uF

2

C13B 100uF

C8B 33p

R70B 82k

IC1A NE5532

R72B 8k2

R13B 3k3

C10B 10p

BOTTOM

D

VR2B 1k

R68B 2k7

ZD10B 12V

C32B 680p

D21B IN4148

WIPER C9B 33p

D11B BAV21

TR18B BC214L

3 TOP

R11B 3k3

C7B 82p

D25B IN4148

R66B 8k2

R64B 150R

4

R9B 3k3

C17B 10p

C12B 100uF

5 BLUE

GT2B

D1B IN4148 ZD5B 15V

R20B 120k R12B 10k

SC1B

C29B 100uF

GND

R14B R10B 3k3

ZD12B 12V

R83B 100R

6k2

RED

ZD8B 10V

R21B 1k5

GT1B

D13B BAV21

+15

C11B 4p7

R28B 330R

C23B 100p

GND C52B 47p

SCN

R18B 680R

R23B 10k

C16B 100u

ZD11B 12V

D26B IN4148

R65B 150R

C18B 100uF

D22B IN4148

FEEDBACK C33B 680p

C55B 1n

R84B 100R

GND

R69B 2k7

TR19B BC184L

R71B 82k

R73B 8k2

D12B BAV21

C24B 100p

C

R67B 8k2

D2B IN4148

-15

GT3B

+ MT

R16B 330k

BRIDGE IN

R80B 36k

ZD6B 15V

R25B 1k5

RV3B 220k

C30B 100uF

R31B 330R

C19B 100uF R24B 4k7

R82B 33k

C22B 47p

ZD9B 10V

ZD7B 30V

R26B 4k7

D14B BAV21

R30B 100R

ZD13B 12V

SC2B

C21B 100n

GT4B B

R29B 100k - MT

C53B 680n

R81B 33k

R19B 330k

Title

- MT

CHANNEL B DRIVER STAGE C1048 1 Size

Number

Revision

A3

Date: File:

1-Jul-1999 D:\PROTEL\ST\ST1000\C1048.S04

Sheet of Drawn By:

5

4 LMB

A

+ HT

F

C DRAWING OF OUTPUT STAGE COMPONENT REFERENCES SHOULD BE SUFFIXED WITH A OR B FOR RESPECTIVE CHANNELS

C34 10P

C35 10P

R32 560R

R33 560R

TR1 K1058

GT1

C36 10P

TR2 K1058

C37 10P

R34 560R

R35 560R

TR3 K1058

TR4 K1058

E

D15 BYT30P400 SC1

+ MT C

C38 10P

C39 10P

C40 10P

C41 10P

Cmod1 R36 560R

R74 2K2 4W

Cmod2

R37 560R

R38 560R

R39 560R

TR7 K1058

TR8 K1058

R75 2k2 4W

R78 3R3 2.5W

C50 100n

D TR5 K1058

GT2

TR6 K1058

G

C43 10P

S

R43 560R G

D

D

C42 10P

R42 560R G

TR12 J162

C44 10P

G

C45 10P

R76 2K2 4W

R77 2k2 4W

R79 3R3 2.5W

C51 100n

C

D

R41 560R

D

R40 560R

TR11 J162

S

TR10 J162

S

TR9 J162

S

GT3

D16 BYT30P400

SC2

- MT C

R44 560R

R45 560R G

R46 560R G

TR16 J162

S

TR15 J162

S

TR14 J162

S

TR13 J162

S

GT4

R47 560R G

G

C47 10P

C48 10P

D

D

D

D

B C46 10P

C49 10P CON - HT C

Title Size A3 Date: File:

OUTPUT STAGE A/B C1048 1 Number

1-Jul-1999 D:\PROTEL\ST\ST1000\C1048.S05

Revision

Sheet of Drawn By:

5

5 LMB

A

1

2

3

4

5

6

7

8

+ HT + HT

BR1B SB5006

BR2A SB5006 ACH(A)

R1A 2k2

ACH(A)

C1A 9000uF

ACH(B)

R1B 2k2

ACH(B)

C1B 9000uF + MT

+ MT FEEDBACK FEEDBACK

R2A 2k2

C2A 9000uF

R2B 2k2

R7A 10R 2.5W

ACL(B) ACL(A)

R7B 10R 2.5W OUTPUT B RL1B

BR2B SB5006

OUTPUT A RL1A

BR1A SB5006

C2B 9000uF

ACL(B)

ACL(A)

L1B L1A R3A 2k2

R5A 10R 2.5W

C3A 9000uF

R6A 10R 2.5W

R8A 10R 2.5W

R3B 2k2

R5B 10R 2.5W

C3B 9000uF

R6B 10R 2.5W

- MT - MT

R4A 2k2

C5A 220n 400V

C4A 9000uF

GND

C6A 100n 400V GND

R4B 2k2

C5B 220n 400V

C4B 9000uF

GND

R8B 10R 2.5W

C6B 100n 400V GND

- HT - HT

Title Size B

POWER SUPPLY SECTION C1048 1

Date: File:

Number

1-Jul-1999 D:\PROTEL\ST\ST1000\C1048.S02

Revision

Sheet of Drawn By:

2

5 LMB

+15 R53A 47k

+15 C27B 10u

CHANNEL A

R54A 47k

- MT

THERMAL/A

R56A 220k

F

2

+ MT

R61B 470k

RL1A RELAY

D6A IN4148 1

o 112 C N/C

-15

D5A IN4148

R57A 10M

CHAN A

R48A 47k

OUTPUT

D1A IN4148

R52A 3k

9

TR17A BC214L

E

10

PEAK A

14

D3A IN4148

C26A 100u

CN1.1

R58A 470k

ZD1A 12v

R50A 1M

C25A 1uF

IC1D LM339 11 13

8

R49A 4k7

ZD3A 6V8

R60A 10M

D2A IN4148 IC1C LM339

D4A IN4148

C28A 100p

R59A 470k

-15

THERMAL A / ZD2A 12v

2

+15

- MT

R54B 47k

CHANNEL B

+15

ZD3B 6V8

R57B 10M

R60B 10M

3

D2B IN4148

OUTPUT

R48B 47k

D1B IN4148

R52B 3k

6

PEAK B

2 C26B 100u

12

CN1.2

R50B 1M

TR17B BC214L

1

5

C25B 1uF

IC1B LM339 7

IC1A LM339

4

R49B 4k7

D4B IN4148

-15

R55B 18k

CHAN B

RL1B RELAY

D6B IN4148 +15

D

1

+ MT

R53B 47k

C

D3B IN4148 R58B 470k

ZD1B 12v

C28B 100p

R59B 470k

R51B 11k

/

-15

ZD2B 12v

-15

+15

AC 1 18V

D1 IN4004

IC2 MC7815T

(Y29)

+15V

C1 470u

C3 100u

R1 1k5

OV

B

SOFT START BRIDGE LED CN1.5 BRIDGE SW1

2

D2 IN4004

Vin

LED COMMON CN1.4 FAN +

3

GND

1

R3 56R

(Y30)

LIVE IN

NTC1

NTC2

SG64

SG64

LIVE OUT

1

BRIDGE SW2

D3 IN4004

2

(Y31)

D4 IN4004

Vin IC3 MC7915T

R2 3k

C4 100u

GND

AC 2 CON

C2 470u

-15V

3

POWER LED CN1.3 Title FAN -

Size A3

-15

Date: File:

ST1000 PROTECTION C1048 1 Number

1-Jul-1999 D:\PROTEL\ST\ST1000\C1048.S01

Revision

Sheet of 1 Drawn By:

5 LMB

A

ST Series Modification Procedure General The following changes are to be made to All ST amplifiers irrespective of Issue : 1) Remove C20 & C28 (10pF) from the PCB and replace with 15pF, 50V ceramic capacitors. 2) Remove C10 & C32 (47pF) from the PCB and replace with 100pF, 50V ceramic capacitors. 3) Remove C17 & C40 (100nF) from the PCB and replace with 22nF, 250V polyester capacitors. 4) Remove C16 & C39 (220nF) from the PCB and replace with 47nF, 250V polyester capacitors. 5) Remove C12, C13, C35 & C36 from the PCB. Note, It is better to do this by cutting the component leads close to the PCB to avoid damaging PCB traces. 6) Fit 2 x 1N4148 diodes solder-side in reverse parallel from IC2 pin 3 to 0V, as per figure 1. 7) Fit 2 x 1N4148 diodes solder-side in reverse parallel from IC4 pin 3 to 0V, as per figure 1. 8) Remove any capacitors fitted on the solder-side of the PCB that connect to the middle pin of the Output transistors. DO NOT remove the 10pF capacitors fitted across the two outside pins of the K1058 transistors. 9) Fit 220pF, 1kV ceramic capacitors between Drain and Source of TR6 and TR17 as per figure 1.

Issue Specific Changes At this point, it is necessary to ascertain the exact issue status of the unit before proceeding, as follows: 1) Issue 6 PCBs: Go To Procedure 1. 2) Issue 4 & 5 PCBs fitted with P1040 & P1041 protection daughter boards: Go To Procedure 2. 3) Issue 4 & 5 PCBs fitted with Resistor-Resistor-Diode-Capacitor networks in positions R55, R56, R19 and R20: Go To Procedure 3. 4) Previous Issues: Go To Procedure 4.

Procedure 1 Issue 6 PCBs 1) Remove R17, R22, R53 & R58 (5k6) from the PCB and replace with 5k1, 1/4W. 2) Remove R18, R21, R54 & R57 (1k8) from the PCB and replace with 5k1, 1/4W. 3) Remove ZD1, ZD2, ZD3 & ZD4 (12V) from the PCB and replace with 9V1 1/2W. 4) Fit 390k, 1/4W resistor solder-side between D40 Cathode and D41 Anode, as per figure 2. 5) Fit 390k, 1/4W resistor solder-side between D43 Cathode and D42 Anode, as per figure 2.

Procedure 2 Issue 4 & 5 PCBs with Modification Daughter Boards 1) Remove R17, R22, R53 & R58 (5k6) from the PCB and replace with 5k1, 1/4W. 2) Remove ZD1, ZD2 & ZD3 (12V) from the PCB and replace with 9V1 1/2W. 3) Fit 9V1, 1/2W zener diode solder-side in position ZD4 as per figure 3.

Modification to P1040 Daughter Board 1) Remove R18 & R21 (1k8) from the PCB and replace with 5k1, 1/4W. 2) Fit 390k, 1/4W resistor solder-side between D1 Cathode and D2 Anode, as per figure 4.

Modification to P1041 Daughter Board 1) Remove R54 & R57 (1k8) from the PCB and replace with 5k1, 1/4W. 2) Fit 390k, 1/4W resistor solder-side between D2 Cathode and D1 Anode, as per figure 4.

Figure 4

Procedure 3 Issue 4 & 5 PCBs with Resistor-Resistor-Diode-Capacitor Networks

1) Remove R17, R22, R53 & R58 (5k6) from the PCB and replace with 5k1, 1/4W. 2) Remove R18, R21, R54 & R57 (1k8) from the PCB and replace with 5k1, 1/4W. 3) Remove ZD1, ZD2, ZD3 & ZD4 (12V) from the PCB and replace with 9V1 1/2W. 4) Fit 390k, 1/4W resistor between Component Network diodes as per figure 5. 5) Fit 390k, 1/4W resistor between Component Network diodes as per figure 5. Figure 5

Procedure 4

1) Remove R17, R22, R53 & R58 (5k6) from the PCB and replace with 5k1, 1/4W. 2) Remove R18, R21, R54 & R57 (1k8) from the PCB and replace with 5k1, 1/4W. 3) Remove ZD1, ZD2, ZD3 & ZD4 (12V) from the PCB and replace with 9V1 1/2W. 4) Remove Components fitted in positions R19, R20, R55 & R56 and replace with networks consisting of 1N4004 diodes, 8k2 resistors, 39k resistors, 680pF capacitors and 390k resistors as per figure 6. 5) Remove the fixing screws for the K1058 output transistors and remove the insulating pad between the transistor and the heatsink. 6) Rub-down the heatsink with medium abrasive paper to remove any burrs or remnants of insulating pad. 7) Ensure the mounting faces of the power transistors are clean and then apply a thin, even layer of heatsink compound to the device and re-assemble the devices onto the heatsink. Ensure the fixing screws are secure but take care not to over-tighten. Figure 6

General notes

Once the appropriate modifications have been carried out it is recommended that the following checks are performed before attempting to re-test the amplifier. 1) Output Stage : Check for faulty Output transistors in the following way : a) Measure between Drain and Source of each transistor with a multi-meter set on a low Ohms range. A short-circuit reading indicates one or more transistors is faulty. b) Measure between Gate and Source of each transistor with a multi-meter set on the 2k Ohms range. A reading of less than 560 Ohms indicates a faulty transistor. 2) Zobel Resistors : Check R34, R35, R106, R69, R71 & R109. Replace with the correct 10R, 2.5W parts if faulty, or show any signs of having over-heated. Final Checks Once the amplifier has been modified and repaired it is always possible that there remains one or more components which have been weakened or damaged by any previous failure. The easiest way to confirm all is well is to perform a simple short-circuit test on the amplifier as follows : Drive the amplifier into a 4 Ohm load to an output level just prior to the clip point. Connect a short circuit across the amplifier output for a period of approximately ten seconds. Remove the short circuit and check the output returns to its previous level. If any Output transistors fail during this test, they should be replaced, but output transistors continue to fail (especially if they are recently replaced parts) the current limiting protection circuits should be checked for faulty components.