AUDIO TELEX ACM250P Instructions d'utilisation et d'installation

Australian Monitor

1 Clyde Street, Silverwater NSW 2128 Australia

+61 2 9647 1411

www.australianmonitor.com.au

SERVICE INFORMATION

AUDIO TELEX

ACM250P

POWER AMPLIFIER

CONTENTS:

OPERATION MANUAL

SCHEMATIC DIAGRAMS

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Audio Telex Communications Pty Ltd

ACN 00134S82 lncorporated in NSW

NSW & ACT

149 Beaconsfield Street

Private Bag 149

Silverwater NSW 2128

Australia

Ph 02 96/.71411

FaxO2 9648 3698

42 CommercialRoad

PO Box 871

Fortitude Valley QLD 4006

Ph 07 38521312

Fax 07 32521237

221277 Middleborough Road

Box HillVlC 3128

PO Box 151

Blackburn South VIC 3130

Ph 03 98907477

Fax 03 9890 7977

299 Fitzgerald Street

West Perth WA 6005

PO Box 404

North Perth WA 6906

Ph 08 9228 4222

Fax 08 9228 4233

Electronic Concepts Pty Ltd

76 George Street

Thebarton SA 5031

PO Box 7034 Hutt Street

Adelaide SA 5000

Ph 08 82349444

Fax 08 823494/.1

K W McCulloch Pty Ltd

54a Albert Road

MoonahTAS 7009

Ph 03 62286373

Fax 03 6278 1063

Unit B, 11 Piermark Drive

PO Box 512

Albany NZ 1331

Ph 09 4159426

Fax 09 415 98il

ACM250P Power Amplifier

Product Description

The ACM250P is a 250 watt power amplifier with outputs for 4 ohms, 70 and 100 volt line. It may be desk or rack mounted but

comes standard as self standing with rubber feet. The ACM250P features a flat screwdriver accessible gain control on the rear panel.

The factory setting for the front panel gain control is I volt RMS.

Front Panel

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POWef BUttOn: This switch controls the switching of AC power to the amplifier. Rocking this switch turns the AC power to the

amplifrer on and off. When in the on position, the red neon in the body of the switch will glow.

Protect LED: A feature of the ACM250P is high temperature protection. In most applications, the internal cooling fan will most

probably never switch on. When used with demanding speaker loads or in difficult operating environments, the fan may regularly

switch on to cool the amp down and then switch offagain. This switching on and switching offis quite normal. The "Protect" function

is there to protect the amplifier from a high temperature problems which would only occur if the fan stopped working or became

clogged up. In this very rare occurance, the amplifier will shut down and the protect LED will illuminate. The amplifier will

automatically restart once it's internal temperature has fallen within "safe" limits. If the protect LED illuminates, it is best to switch

the amplifier off, let it cool down and then try it again. If the protect LED illuminates again, please contact either Audio Telex or the

company who supplied or installed the equipment.

Rear Panel

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AC FUSE

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3 Pin IEC Mains Power lnlet The operating voltage is 240 VAC @ 50 Hz or I l0 VAC @ 60 Hz (special order). The AC

power voltage level is not extemally user adjustable but is factory pre-set. The inlet is equipped with an inbuilt AC fuse holder fitted

with a 6 amp fuse plus a spare found within the holder. Power consumption is 400VA. I Please ensure that the mains power

cord is disconnected before attempting to check or replace this fuse.

Direct Output Terminal Strip: These screw terminals allow access to the direct outputs of the amplifier. Reading from

left to right the terminals are-

. Low Impedance Common

. 4 Ohms

I Spare

r Constant Voltage Common

. 70 Volt Line

' 100 Volt Line

TWin DG fuse receptacles: Access the DC fuses is by tuming the cap half a tum counter-clockwise with a screwdriver.

The value of the fuses is 10 Amps slow blow. I Please ensure that the AC power switch is in the 'oI? position and that the

mains power cord is disconnected before attempting to check or replace this fuse.

Signal lnpUt SOCketS: Signal input to the ACM250P is via a 3 pin XLR socket and is rated at lOK Ohms and is active

balanced. The two sockets are provided for bridged in/out connection. Pin connections are Pin l:Earth. Pin 2=Active Positive (+).

Pin 3:Active Negative (-).

Gain COntfOl LeVel: A recessed (screwdriver adjustable) gain control is located on the back panel. Tuming the control

clockwise will increase the output of the ACM250P towards it's maximum output level while turning the control counter-clockwise

will decrease the output level. Adjust this control for the desired output level depending on the level of the input signal (from a mixer

or other signal source). The factory default setting for this control is such that a I volt input will give a 100 volt output.

Fuse Sizes

Mains 240 VAC: 6 Amperes Slow Blow

DC: Z x 10 Amperes Slow Blow

Notes

There are no user adjustable controls inside the amplifier so the cover should only be removed by qualified service personnel. In all

cases the mains power lead should be disconnected before the cover is removed.

12345678

7654321

Title

Number RevisionSize

Date: 16-Oct-2002 Sheet of

File: C:\Protel Files\CDTRAX\CD6241-1.DDB Drawn By:

IC1

LM741

10K

10K R4

10R

10K

100P

4u7

50K

100P

.1u

910

IC2

16C54 C7

22P

XT1 R8

560R

R10

R11

BD139

BC546

BC546 R12

100R

4u7

R13

4K7

20V C10

100u

C11

100u

R14

4K7

R15

4K7

C12

4u7

C13

47u

R16

4K7

R17

10K

R18

IC3

78L05

R19

10R

C14

47u C15

4u7

45VDC

INPUT

X1/1

GND

FAN

INPUT

1/2 VCC

GND

19V VCC

FAN PTC

HI TEMP PTC

HI TEMP LED

6X 10K

ACM250-P INPUT

CD6241-1

12345678

7654321

Title

Number RevisionSize

Date: 16-Oct-2002 Sheet of

File: C:\Protel Files\CDTRAX\CD6240-11.DDBDrawn By:

R42

R37

R36

100K

4u7

R35

100R

R32

1K5

R28

.1R

R27

.1R

C10

.1u

68K

10K

680R

100R

R10

100R

R13

R14

R15

150R

R16

150R

R17

R18

R19

470R

R20

470R

R21

10R

R22

10R

R23

470R

T3A

T3B

V10

V15

V11

V16

500R

R39

150R

820P

R50

.22 R51

.22

2u2

R55

.22 R56

.22

R38

150R

500R

820P

IC2

78L05

BC640

C1. C2.

4A SB

10A SB

R31

IC1A

LM833

IC1B

LM833 R11

R12

R24

10K

R25

10K

R26

10K

R40

10K

R41

47K

R43

10K

.47

100P

C11

100P

BD139

R45

4K7

D15

12V

BC546

C13

2u2

C14

47u

R46

4K7

R47

2K2

D16

4V7

R48

70DEG

R49

100DEG

BR1

10A SB

IC3

7818 C8

4u7

C15

100u

R44

470R

C12

.47u

1/2 VCC

CD6240-1

ACM250 POWER AMP

GND

INPUT

X3/1

X1/1

4 OHM

X2/9

X2/7

XT/5

X2/4

X2/2

X2/1

X2/3

X2/8

X2/6

240VAC

COM

70VAC

100VAC

FAN

TEMP FAN

TEMP CUTOUT

+45VDC

FAN

V10-V19=TIP35C

R50-59=.22R

PLEASE NOTE:

BC639

1 2 3 4 5 6 78

7654321

Title

Number RevisionSize

Date: 14-Apr-2004 Sheet of

File: C:\PDF CCT\CD6240-12.DDB Drawn By:

C12

.47u

R44

470R

C15

100u C8

4u7

IC3

7818

10A SB

BR1

R49

100DEG

R48

70DEG

D16

4V7

R47

2K2 R46

4K7

C14

47u

C13

2u2

BC546

D15

12V

R45

4K7

BD139

C11

100P

.47

R43

10K

R41

47K

R40

10K

R26

10K

R25

10K

R24

10K

R12

R11

IC1B

LM833

IC1A

LM833

R31

N1 F2

10A SB

6.3A-SB

C2.C1.

BC640

IC2

78L05

820P

500R

R38

150R

R56

.22

R55

.22

2u2

2u2 R51

.22

R50

.22

820P

R39

150R

500R

V16

V11

V15

V10

T3B

T3A

R23

470R

R22

10R

R21

10R

R20

470R

R19

470R

R18

R17

R16

150R

R15

150R

R14

R13

R10

100R

680R

10K

68K

.1u

C10

.1u

R27

.1R

R28

.1R

R32

1K2

R35

100R

4u7

R36

100K

R37

R42

BC639

PLEASE NOTE:

R50-59=.22R

V10-V19=TIP35C

FAN

+45VDC

TEMP CUTOUT

TEMP FAN

FAN

SBG

100VAC

70VAC

COM

240VAC

X2/6

X2/8

X2/3

X2/1

X2/2

X2/4

XT/5

X2/7

X2/9

4 OHM

X1/1

X3/1

INPUT

GND

ACM250 POWER AMP

CD6240-1

1/2 VCC

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