Allen & Heath PA User Manual

PA Series

1kW Powered & Unpowered Audio Consoles

SERVICE INFORMATION

Publication AP5288

Introduction

This publication provides technical information on servicing the Allen & Heath PA Series consoles. Included are system block diagram, internal layout drawing and circuit schematics with board layouts and spare parts lists. Whilst we believe this information to be reliable we do not assume responsibility for inaccuracies. We also reserve the right to make changes in the interest of further product development.

Additional Resources

Allen & Heath web site www.allen-heath.com Product information Technical downloads Distribution contacts Company contacts

Technical support support@allen-heath.com

See web for local contact

Effects editor software PA-FX Editor Download from web site

PA-CP user guide AP4956 Operating instructions Performance specification

PA user guide AP5195 Operating instructions Performance specification

PA Series Service Information

Issue status: pa_series_ap5288_6.doc

Print date: 08 December 2004

Allen & Heath Limited

Kernick Industrial Estate, Penryn, Cornwall, TR10 9LU, UK

http://www.allen-heath.com

2 pa_series_ap5288_6.doc

Servicing Precautions – General Notes

Service personnel: Service work should be carried out by technically qualified service personnel only.

Mains power is dangerous and can kill. Do not attempt to work on a linear or switched mode power supply if you are not suitably qualified to do so. Do not attempt to repair surface mount circuit assemblies unless you are suitably qualified and have the necessary facilities to do so. Replacement circuit assemblies can be ordered.

Service facilities: Ensure a suitably sized work surface is available. Ensure this is clear of dirt, debris

and obstructions which may damage the equipment surfaces. Ensure adequate lighting. Use the correct tools for the job and ensure they are in good working order. Ensure all workshop safety requirements are adhered to.

Service information: Check that you have all the information you need before starting the service job. Refer

to the Allen & Heath web site or contact Allen & Heath technical support for details on the latest information. Full technical information can be downloaded from the web site Distributor Zone (password required).

Mains power: Connect the equipment to mains power only of the type described in the user guide

and marked on the rear panel. The power source must provide a good ground connection. Ensure you always use an isolation transformer when working on any mains power supply unit.

Mains cord and fuse: Use the correct power cord as supplied with the equipment. Do not remove or tamper

with the ground connection in the power cord. Heed the Important Mains Plug Wiring Instructions printed in the user guide if it is necessary to rewire the mains cord. Always replace the equipment mains fuse with the correct type and rating as described in the user guide and marked on the equipment panel.

Opening the unit: Switch off and remove the mains power cord before opening the equipment. Ensure

all power supply covers and safety shields are in place before applying power with the unit open for diagnostic fault finding.

Closing the unit: Before finishing, check the quality and accuracy of the service work carried out.

Remove any dirt or debris as this may cause equipment failure in the future. Ensure all assemblies, harnesses and connectors are correctly aligned and plugged in. Ensure that jumper settings and control configurations are correctly set according to the requirements of the customer.

Testing the unit: Before operating the equipment, read and adhere to the Important Safety Instructions

printed in the user guide. Test that the service work has been successfully carried out.

Shipping the unit: Use adequate packing such as the original packaging or purpose designed flight case

if you need to ship the unit. To avoid injury to yourself or damage to the equipment take care when lifting, moving or carrying the equipment.

Servicing Notes – PA-CP

User maintenance: There are no user serviceable parts inside. It should not be necessary for the user to

Technology:

remove the cover or access internal parts.

The PA-CP uses conventional thru-hole and SMT (surface mount) PCB technology. It

has a built-in linear regulated power supply which should be serviced by suitably qualified personnel only.

Operation: To test the console make sure it is connected as described in the user guide. Check

that the voltage setting marked on the rear panel is correct for the local mains supply.

Fault finding: For effective fault diagnosis trace the signal flow through the circuit path. Refer to the

system block diagram. Replacement circuit assemblies are available from Allen & Heath.

pa_series_ap5288_6.doc 3

Contents Log

Internal Layout drawing ........................................... pa_series_layout_3.pdf

Surface and Main Parts.............................................. pa_series_parts_4.pdf

PA-CP System Block Diagram........................... pa-cp_blockdiagram_2.pdf

PA System Block Diagram...................................... pa_blockdiagram_2.pdf

PA-CP Mono Input Pcb.........................pa-cp_003-034_monoinput_1.1.pdf

PA Series Stereo Input PCB ..........pa_series_003-035_stereoinput_2.1.pdf

PA Series Aux / FX PCB...........................pa_series_003-036_auxfx_2.1.pdf

PA Series Sub 1 PCB............................... pa_series_003-037_sub1_1.1.pdf

PA Series FB1 / Phones PCB .........pa_series_003-038_fb1phones_2.1.pdf

PA Series FB2 PCB..................................... pa_series_003-039_fb2_1.1.pdf

PA-CP LR Master PCB ................................. pa-cp_003-040_lrmaster_3.pdf

PA-CP Distribution PCB .......................... pa-cp_003-041_distribution_2.pdf

PA Series Effects PCB ............................. pa_series_003-042_effects_2.pdf

PA-CP Amplifier PCB .................................. pa-cp_003-043_amplifier_4.pdf

PA-CP Power Supply PCB...................... pa-cp_003-069_linearpsu_3.2.pdf

PA-CP Power Supply PCB...................... pa-cp_003-069_linearpsu_3.3.pdf

PA Series FX LED PCB ............................ pa_series_003-070_fxled_2.1.pdf

PA Mono Input PCB ................................... pa_003-091_monoinput_1.2.pdf

PA LR Master PCB ............................................ pa_003-092_lrmaster_1.pdf

PA Distribution PCB ..................................... pa_003-093_distribution_1.pdf

PA Switched Mode Power Supply PCB ..............pa_003-094_smpsu_2.pdf

PA Switched Mode Power Supply PCB ..............pa_003-094_smpsu_4.pdf

4 pa_series_ap5288_6.doc

PA Series – Historical Change Log

The following list identifies historical changes to the PA Series. The effective dates, serial numbers and related change note documentation are included for reference to help identify the correct issue circuit boards and components. Whilst we believe this information to be reliable we do not assume responsibility for inaccuracies. We also reserve the right to make changes in the interest of further product development.

Assembly Description

Main

003-094

003-069

003-094

003-034

Fader change to add extra master fader

PA SMPSU PCB Minimum current increase for TL783

PA-CP Linear PSU PCB +/- 15V rail fuse value changes

PA SMPSU PCB post regulation added – up-issue to issue 4

PA CP Mono Input 48V 22R type change

From Serial

Number

019388

018930

018780

-

Date

16/06/03 917

23/09/03 949

23/09/03 950

13/11/03 966

25/02/04

Change Note

Number

990

pa_series_ap5288_6.doc 5

PA Series Surface Parts

9MM POT NUT AB8050

GREY-RED KNOB AJ2074

14MM 5KRDx2 POT AI8174

GREY PUSH BUTTON AJ2864

LATCHING SWITCH AL0162

GREY-L/BLUE KNOB AJ2076

11MM 20KB C/D POT AI8004

GREY-GREEN KNOB AJ2077

11MM 200KCx2 POT AI8005

11MM 20KB C/D POT AI8004

GREY-GREY KNOB AJ2078

11MM 20KK POT AI8003

GREY-BLUE KNOB AJ2075

11MM 20KK POT AI8003

GREY-YELLOW KNOB AJ2079

11MM 20KK POT AI8003

GREY-BROWN KNOB AJ2080

14MM 10KACx2 C/D POT AI8008

RED TOMBSTONE LED AE4863

WHITE PUSH BUTTON AJ2962

LATCHING SWITCH AL0162

RED LED AE0086

ROUND GREY PUSH BUTTON AJ2864

LATCHING SWITCH AL0162

LINE

12kHz

250Hz

60Hz

MIC

-10 -5

FB1

FB2

AUX

PAN

-5

0

350Hz

0

20

10

100Hz

-15 1k5

-15 +15

-15

O

OOO

O

=

-5 30

63 25

+15

7k

+15

+6

RL

-10

-20

-30

OO

-10

-20

-30

OO

-15 +15

-15

OO

L R

0

14MM 20KKx2 POT AI8007

9-10 LR

5

10

LATCHING SWITCH AL0162

11MM 200KCx2 POT AI8005

11MM 20KB C/D POT AI8004

0

14MM 20KKx2 POT AI8007

5

10

11MM 200KCx2 POT AI8005

11MM 20KB C/D POT AI8004

14MM 20KBx2 C/D POT AI8006

-10

0

14MM 20KBx2 C/D POT AI8006

+15

11MM 20KK POT AI8003

+6

11MM 20KK POT AI8003

+6

11MM 20KK POT AI8003

+6

GREEN TOMBSTONE LED AE4864

11MM 20KK POT AI8003

+6

=

MOMENTARY SWITCH AL0374

14MM 10KACx2 C/D POT AI8008

LATCHING SWITCH AL0162

14MM 20KKx2 POT AI 8007

11MM 20KK POT AI8003

M3x5 SCREW AB4661

LATCHING SWITCH AL0162

STAGE

ROOM

HALL

PLATE

CHAMBER

CATHEDRAL

ARENA

GATED REV

PK !

3

O 10O

+6OO

+6

OO

KARAOKE

PING PONG

CHORUS

SLAP+REV

DLY+REV

ECHO+REV

CH+REV

PH+REV

70

10030

200

20Hz

+10

-10

70

100

30

200

20Hz

-10

12WAY LED BAR AE2701

4ABx5/16 SCREWAB0059

5MM RED LED AE0001

14MM 20KKx2 POT AI8007

LATCHING SWITCH AL0162

M3x5 SCREW AB4661

LATCHING SWITCH AL0162

200

-10

120Hz

-10

500

500Hz120Hz

1k

500Hz

5k

10k

+10

-10

2k5

5k

10k

+10

-10

1k 1k200

2k

+10

500

1k

2k

+10+10

7k2k5

2k5

10k

1k5

-10

7k

2k5

1k5

MIN

20k

LIM

SIG

SPK

+10

OFF

TMP

SPK OFF

SIG

LIM

20k

11MM 20KK POT AI8003

MAX

GREEN LED AE0085

LATCHING SWITCH AL0162

FB1

FB1L

YELLOW LED AE0084

FB2

L R+R

LATCHING SWITCH AL0162

11MM 20KK POT AI8003

MIN

+10

-10

MAX

BLUE LED AE4041

LATCHING SWITCH AL0162

11MM 20KK POT AI8003

+6OO

LATCHING SWITCH AL8065

POST-LR

LATCHING SWITCH AL8065

PRE-LR

TO

OOMAXMIN

14MM 20KKx2 POT AI8007

+6

GREEN TOMBSTONE LED AE4864

POST-LR FADER

LATCHING SWITCH AL0162

10

40

50

3k600

12kHz

60Hz

PK !PK !

M3x5 SCREW AB4661

WHITE-BLACK FADER KNOB AJ8078

100MM 10KD FADER AI8117

BLUE-BLACK FADER KNOB AJ8081 100MM 10KDx2 FADER AI8118

YELLOW-BLACK FADER KNOB AJ8080

100MM 10KDx2 FADER AI8118

BLACK-WHITE FADER KNOB AJ3503

100MM 10KD FADER AI8117

PA series products up to serial number 019388 have x1 stereo MASTER LR FADER

PA series products from serial number 019388 have x2 mono MASTER L & R FADERS

RED-BLACK FADER KNOB AJ8079 100MM 10KDx2 FADER AI8118

RED-BLACK FADER KNOB AJ8079 100MM 10KD FADER AI8117

pa_series_parts_4.doc Sheet 1 of 2

PA Series Surface Parts

A

4x5/16 SCREW AB2810

FEMALE XLR AL2412

M3x5 SCREW AB5344

1

JACK NUT AL4715

JACK SOCKET AL4713

LATCHING SWITCH AL0162

20DIA P4x5 FAST FOOT AK0102

5WAY FEMALE DIN SOCKET AL3962

M3x6 SCREW AB0072

SINGLE PHONO AL4895DUAL PHONO AL0577

4x5/16 SCREW AB2810

M3x10 SCREW AB0093 4PIN FEMALE XLR AL8104

M3x5 SCREW AB5344

SIDE MOULDIING AA4920-L/R

OR RACK EARS AA5013

HANDLE AA4922 FRONT EXTRUSION AA4923

M3x10 SCREW AB0076

BLACK BUTTON AJ2887

MAINS SWITCH

PA series products up to serial number 019388 have x1 stereo MASTER LR FADER

PA series products from serial number 019388 have x2 mono MASTER L & R FADERS

L3338

ON/OFF

0

I

ENGINEERED IN ENGLAND BY ALLEN & HEATH Ltd.

MAINS IEC AL5118

SERIAL NUMBER

MAINS INPUT

V AC ~ 47- 63 Hz

1600W MAX

FUSE HOLDER AL3178 10A FUSE AL3455

AVIS: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR.

DO NOT OBSTRUCT VENTILATION OPENINGS. NO USER SERVICEABLE PARTS INSIDE.

WARNING: TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT EXPOSE THIS APPARATUS TO RAIN OR MOISTURE. THIS APPARATUS MUST BE EARTHED BY THE POWER CORD. RISK OF HAZARDOUS ENERGY! MAKE PROPER SPEAKER CONNECTIONS.

SEE OPERATING MANUAL BEFORE USING.

CAUTION: FOR C ONTINUED PROTECTI ON AGAINST RISK OF FIRE ATTENTION: REMPLACER LE FU SIBLE AVEC UN DES MEMES CARACTERISTIQUES.

100-240V T10A L

FUSE

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

AVIS: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR.

NO USER SERVICEABLE PARTS INSIDE.

WARNING: TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT EXPOSE THIS APPARATUS TO RAIN OR MOISTURE. THIS APPARATUS MUST BE EARTHED BY THE POWER CORD. SEE OPERATING MANUAL BEFORE USING.

CAUTION: FOR CONTINUED PROTECT ION AGAINST RISK OF FIRE ATTENTION: REMPLACER LE FUSIBLE AVEC UN DES MEMES CARACTERISTIQUES.

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

CONSTANT POWER SW ITCH

12V LAMP

REPLACE FUSE WITH SAME TYPE AND RATING.

8 OHMS4 OHMS

SET SWITCH TO MATCH SPEAKER IMPEDANCE

SPEAKER OUTPUTS

500W + 500W RMS

4 OHM LOAD MINIMUM

CONNECT SPEAKER BETWEEN PIN 1+ AND PIN 1-

SLIDE SWITCH AL5071 SPEAKON CONNECTOR AL8126

ON/OFF

I 0

REPLACE FUSE WITH SAME TYPE AND RATING.

75W MAX

FUSE

100-240V T1A L

SERIAL NUMBER

ENGINEERED IN ENGLAND BY ALLEN & HEATH Ltd.

MAINS INPUT

100 - 240 V AC ~ 47- 63 Hz

MAINS IEC AL3458

M3x10 SCREW AB0093

MAIN OUTPUT

BALANCED PIN2 = +

15DIA 9MM HIGH FAST FOOT AK5069M4x8 SCREW AB0332

MALE XLR AL2411 4x5/16 SCREW AB2810

pa_series_parts_4.doc Sheet 2 of 2

)

FB1 PHONES PCB

003-038

SUB 1 PCB

003-037

PA-CP Powered version

DISTRIBUTION PCB

003-041

FB2 PCB

003-039

COPPER EARTH STRIP

L/R MASTER PCB

003-040

FB2 FADER

FB1 PHONES FADER

PA series products from serial number 019388 have x2 mono MASTER L & R FADERS

PA series products up to serial number 019388 have x1 stereo MASTER LR FADER

AL4875

AUX FX

FADER

FRONT EXTRUSION

EFFECTS PCB

003-042

STEREO INPUT PCBs

003-035 x 2

AUX FX PCB

-

FX LED PCB

003-070

STEREO

INPUT

FADERS

MONO INPUT PCBs

003-034 x 16

MONO INPUT FADERS

Product .............................PA12-CP/100

.........................................PA12-CP/120

.........................................PA12-CP/220

.........................................PA12-CP/240

.........................................PA20-CP/100

.........................................PA20-CP/120

.........................................PA20-CP/220

.........................................PA20-CP/240

PA12-CP Pack Assembly......... 003-030

PA12-CP Main Assembly ......... 003-031

PA12-CP Top Panel Assy. ....... 003-032

PA12-CP Base Panel Assy. ..... 003-033

PA12-CP Rack Ear Assy.......... 003-071

PA20-CP Pack Assy................. 003-083

HANDLE

PA-CP Front Panel assembly Front view (20ch. shown

AMPLIFIER HEATSINK x2

LINEAR PSU PCB

003-069

TRANSFORMER

FAN FAN

LINEAR PSU

HEATSINK

PA20-CP Main Assy................. 003-084

PA20-CP Top Panel Assy. ....... 003-085

PA20-CP Base Panel Assy. ..... 003-086

Mono Input PCB ....................... 003-034

Stereo Input PCB ..................... 003-035

Aux FX PCB ............................. 003-036

Sub 1 PCB................................ 003-037

FB1 Phones PCB ..................... 003-038

FB2 PCB .................................. 003-039

Master L/R PCB ....................... 003-040

Distribution PCB ....................... 003-041

Effects PCB .............................. 003-042

Amplifier PCB ........................... 003-043

Linear PSU PCB....................... 003-069

AMPLIFIER PCB

003-043

FX LED PCB ............................ 003-070

AL4877

pa_series_layout_3.doc Sheet 1 of 2

PA-CP Chassis assembly Front view

FB1 PHONES PCB

003-038

SUB 1 PCB

003-037

PA unpowered version

DISTRIBUTION PCB

003-093

FB2 PCB

003-039

COPPER EARTH STRIP

L/R MASTER PCB

003-092

FB2 FADER

FB1 PHONES FADER

PA series products from serial number 019388 have x2 mono MASTER L & R FADERS

PA series products up to serial number 019388 have x1 stereo MASTER LR FADER

AL4875

AUX FX

FADER

FRONT EXTRUSION

EFFECTS PCB

003-042

STEREO INPUT PCBs

003-035 x 2

AUX FX PCB

-

FX LED PCB

003-070

STEREO

INPUT

FADERS

MONO INPUT PCBs

003-091 x 16

MONO INPUT FADERS

Product ...................................PA12/100

...............................................PA12/120

...............................................PA12/220

...............................................PA12/240

...............................................PA20/100

...............................................PA20/120

...............................................PA20/220

...............................................PA20/240

...............................................PA28/100

...............................................PA28/120

...............................................PA28/220

...............................................PA28/240

PA12-CP Rack Ear Assy.......... 003-071

PA12 Top Panel Assy. ............. 003-095

PA12 Base Panel Assy. ........... 003-096

PA12 Pack Assembly ............... 003-097

HANDLE

PA Front Panel assembly Front view (20ch. shown)

DISTRIBUTION PCB

003-093

PSU ASSEMBLY

003-100

SM PSU PCB

003-094

PA12 Main Assembly ............... 003-098

PA PSU Assy. .......................... 003-100

PA20 Pack Assembly ............... 003-101

PA20 Main Assy. ...................... 003-102

PA20 Base Panel Assy. ........... 003-103

PA20 Top Panel Assy. ............. 003-104

PA28 Pack Assembly ............... 003-105

PA28 Main Assembly ............... 003-106

PA28 Base Panel Assy. ........... 003-107

PA28 Top Panel Assy. ............. 003-108

Stereo Input PCB ..................... 003-035

Aux FX PCB ............................. 003-036

PSU HEATSINK

Sub 1 PCB................................ 003-037

FB1 Phones PCB ..................... 003-038

FB2 PCB .................................. 003-039

Effects PCB .............................. 003-042

FX LED PCB ............................ 003-070

Mono Input PCB ....................... 003-091

Master L/R PCB ....................... 003-092

Distribution PCB ....................... 003-093

SM PSU PCB ........................... 003-094

PA Chassis assembly Front view

pa_series_layout_3.doc Sheet 2 of 2

Products from serial number 019388

PA-CP SERIES BLOCK DIAGRAM

METERS

PFLFXAUX

FB2

FB1RL

PEAK

MUTE

PFL

FADER

PAN

PFL

MONITOR

LR / 2TRK

PFL/AFL

PHONES

L R

HEADPHONES

MIC IN

PP

+

-

+48V

GAIN

LINE IN

MONO CHANNEL

HPF

100Hz

+

-

INSERT

4 BAND EQUALISER

LM HM HF

LF

ST1/3

ST2/4

EXT FX IN

L

R

L

R

L

R

INTERNAL FX

SELECT 1-16 / OFF

GAIN

SEL

CHAN

GAIN

DIR OUT

FX

AUX

FB2

FB1

PEAK

MUTE

SUM

FADER

PFL

+

MUTE

FADER

SUM

BAL

+

FX

AUX

FB2

FB1

FB2

FB1

FB2

FADER

AUX

FX

LR

STEREO CHANNEL

2 BAND EQUALISER

SUM

+

LF

FX CHANNEL

SUM

+

FX MUTE FOOTSWITCH

+

SUM

PEAK

PFL

SUM

HF

L INSERT

R INSERT

AFL

MUTE

AFL

MUTE

2TRK IN

L

R

MAIN LR

FB1 OUT

FB2 OUT

AUX OUT

FX OUT

2TRK

FADERS

2TRK TO LR

BGM

SUM

+

SUM

+

SOURCE SELECT

SPK A SPK B

PRE POST

100Hz

ADC

MUTE

SUB

FB1LFB1

FB2R+L R

STANDBY

MONO

RELAY

SPDIF DIGITAL

2TRK OUT

L

ANALOG

R

LEV

LM HM HFLF

4 BAND EQUALISER

LM HM HF

LF

AMP A

LIMITER

SIGNAL

PROTECT

TEMP

PROTECT

SIGNAL

LIMITER

AMP B

L

MAIN OUT

R

MONO OUT

A

SLAVE OUT

B

LEV

A

AMP IN

LEV

B

pa-cp_blockdiagram_2.doc Sheet 1 of 1

8 OHM4 OHM

Products from serial number 019388

PA SERIES BLOCK DIAGRAM

METERS

PFL

FX

AUX

FB2

FB1

R

L

PEAK

MUTE

PFL

FADER

PAN

PFL

MONITOR

LR / 2TRK

PFL/AFL

PHONES

L R

HEADPHONES

MIC IN

PP

+

-

+48V

GAIN

LINE IN

MONO CHANNEL

HPF

100Hz

+

-

INSERT

4 BAND EQUALISER

LM HM HF

LF

ST1/3

ST2/4

EXT FX IN

DIR OUT

FX

AUX

FB2

FB1

PFL

PEAK

MUTE

SUM

FADER

PFL

+

MUTE

FADER

SUM

BAL

+

FX

AUX

FB2

FB1

FB2

AFL

FADER

AFL

FADER

L

R

L

R

L

R

GAIN

CHAN

GAIN

LR

STEREO CHANNEL

2 BAND EQUALISER

SUM

+

LF

HF

SUM

PEAK

FX CHANNEL

SUM

+

L INSERT

R INSERT

MUTE

2TRK IN

L

R

MAIN LR

FB1 OUT

FB2 OUT

2TRK

FADERS

2TRK TO LR

BGM

SUM

+

SOURCE SELECT

PRE POST

+

100Hz

ADC

MUTE

SUB

FB1LFB1

FB2R+L R

MONO

SPDIF DIGITAL

2TRK OUT

L

ANALOG

R

LEV

LM HM HFLF

4 BAND EQUALISER

LM HM HF

LF

A

L

MAIN OUT

R

MONO OUT

A

SLAVE OUT

B

LEV

INTERNAL FX

SELECT 1-16 / OFF

SEL

pa_blockdiagram_2.doc Sheet 1 of 1

FX MUTE FOOTSWITCH

+

SUM

FB2

FB1

AUX

FX

AUX OUT

FX OUT

A OUT B OUT

PEAK

SIGNAL

PEAK

LEV

B

LEV

SW1A

003-034/1

C2

47/63

C1

47/63

4

SW1B

6

SW2PCOL (SPUN)

1

3

R6 47K 0805

R5 47K 0805

-17VB

MIC-

D2 BAS16

-17VB

+48V

4K7 1% 0805 MELF

MIC+

D3 BAS16

R7

Q1

2SB737

R19

820R 1% 0805 MELF

1K2 1% 0805 MELF

R32

C6

1 6

220/10

POT14 5KRD X2

Q3

BC549

1K2 1% 0805 MELF

+17VB

VR1A

-17VB

4

Q4

BC549

R33

R21

68R 0805

820R 1% 0805 MELF

R8 4K7 1% 0805 MELF

MIC-

Q2

2SB737

R20

C11

33P 0805

C9

33P 0805

R22

2K7 1% 0805 MELF

U1B

6

5

NE5532 SMD

R23 2K7 1% 0805 MELF

LINE INPUT

CN2

JACK SLIMJACK SW6

C10

R

T

C15

R25

33K 1% 0805

47/25

C16

R24

33K 1% 0805

C18

7

47/25

R13 47K 0805

47/25

C12

15P 0805

R26

3K3 1% 0805

U1A

2

3

NE5532 SMD

R28 3K3 1% 0805

C7

220/10

R29 3K3 1% 0805

R27

3K3 1% 0805

3

R46

22R 0805

1

2 5

C17

47/25

VR1B POT14 5KRD X2

AI1

HOLE-AI

FID1

FIDUCIAL

e

AI2

HOLE-AI

FID2

FIDUCIAL

3

1 2

0

R2

0R0 0805

CN1

XLR NC3FAHR20

C3

1N5_S

R1

0R0 0805

R10 1K8 0805

5

SW2PCOL (SPUN)

2

R4 6K8 1% 0805

R3 6K8 1% 0805

MIC INPUT

d

SW2A

SW2PCOL (SPUN)

1

3

C31

22N 0805

R67

0R0 0805

c

120K 1% 0805

C30

22N 0805 R47 100K 1% 0805

R31

R48 22K 0805

b

15

13

15

CN4

BOX 8X2 M 90 DEG

13

16

14

16

14

a

ALLEN&HEATH

Kernick Industrial Estate, Penryn, Cornwall, England. TR10 9LU

+44 (0)8707 556250

Tel:

+44 (0)8707 556251

Fax:

ABCDEFGH

2

R30

100K 1% 0805

Ground

PFL_DET

11

5

7

9

5

7

9

11

6

8812

10

6

12

10

PFL_BUS

FB1 FB2

AUX1 AUX2

MIXL MIXR

4

5

1 2

C28

R50

120K 1% 0805

2

3

V+ +17VB

1

3

1

3

2

4

2

4

V-

+48V

10R PF RAD

ISSUE BY DATE

A MG 25-02-02 B MG 03-05-02 C MG 25-06-02 1 MG 22-7-02

SW2B

6

SW2PCOL (SPUN)

C40

22N 0805

22P_S

U2A

TL072D SMD

R54

+17VA

10R PF RAD

C24

47/25

C25 47/25

R56

-17VA

C20

1

47/25

C38 100N 0805

C39 100N 0805

FILE: C4788_1P1.Sch 15:59:16 26-Mar-2003

JACK SLIMJACK SW6

CN3

R58

47R 0805

R14 47K 0805

R55

10R PF RAD

R57

10R PF RAD

VR1C

POT14 5KRD X2

BRKT

8

INSERT

-17VB

C26 47/25

C27 47/25

R

T

C21

47/25

9

VR2A

POT11 20KB C/D

R51

6K8 1% 0805

R59

82K 0805

R15

47K 0805

R39

12K 0805

C32

47N 0805

1 3

VR5A POT11 20KB C/D

2

13

12kHz

C29 1N0 0805

U2B

6

5

TL072D SMD

R40

12K 0805

R16

47K 0805

250Hz

CN5

EARTH SCREW TERMINAL NARROW

1 2 3 4

6

VR3B 200KC X2 D/G

BRKT

5

6

VR2B

POT11 20KB C/D

BRKT

5

PRINTED:

7

C33

47N 0805

+17VA

C34

100N 0805

-17VA

VR4B POT11 20KB C/D

BRKT

5

6

R68

2K7 0805

120Hz

R60 27K 0805

300 - 6kHz

R52

10K 1% 0805

C4

2N2_S

1 3

VR4A POT11 20KB C/D

8

V+

V-

4

VR5B POT11 20KB C/D

BRKT

5

6

C37

330N 0805

VR6A

POT11 20KB C/D

2

R11 1K8 0805

U3A

2

3

TL072D SMD

2

U1C NE5532 SMD

VR6B POT11 20KB C/D

BRKT

5

13

C13

33P 0805

1

3

6

2

8

V+

V-

4

R69

2K7 0805

1

C5 2N2_S

VR3A

POT11 200KC X2 D/G

R53

10K 1% 0805

U2C TL072D SMD

VR7B POT11 20KK

BRKT

5

6

VR8B POT11 20KK

BRKT

5

PEAK

C22

47/25

8

V+

V-

U3C

TL072D SMD

4

6

PRE EQ

POST EQ

POST MUTE

+17VB

R17 47K 0805

3

1

C35

100N 0805

VR9B POT11 20KK

BRKT

5

6

JP3

JUMP 2 STRT

1 2

JP1

1 2

JUMP 2 STRT JP2

1 2

JUMP 2 STRT

LED RECT 5X2.5MM TOMB RED

SW3B

SW2PCOL (SPUN)

4

6

SW4A

SW2PCOL (SPUN)

VR10B POT11 20KK

BRKT

5

R36

6K8 1% 0805

PIN-SOLDER 1.2MM

2

6

JP4

JUMP 2 SKT

C19

47/25

5

PIN-SOLDER 1.2MM

R49

22K 0805

VR11C POT14 10KAC C/D

BRKT

8

R34

2K2 1% 0805

LD1

RED

GRN

BLU

PFL_BUS

+17VB

9

R9 0R0 0805

1

3

SW3A

SW2PCOL (SPUN)

2

R35

4K7 1% 0805

C23

47/25

SW4B

SW2PCOL (SPUN)

LD2

LED T1 3MM RED

VR7A

6

5

R18 47K 0805

PFL_DET

TITLE:

POT11 20KK

VR8A POT11 20KK

R41 10K 1% 0805

U3B

TL072D SMD

4

5

13

R37

2

13

2

C14 33P 0805

7

VR11A

POT14 10KAC C/D

D1

BAS16

R61

6

22K 0805

R65

4K7 1% 0805

FB1

8K2 1% 0805

R38

FB2

8K2 1% 0805

PIN-WIRE CRIMP 1.0MM

C8

220/10

4

R12

3K3 1% 0805

DIR OUT FEED

P2

PIN-WIRE CRIMP 1.0MM

P1

16

POT14 10KAC C/D

2 5

C36

PEAK

47/25

VR9A POT11 20KK

2

VR10A POT11 20KK

2

VR11B

3

R64

47K 0805

5K6 0805

PA SERIES MONO INPUT

PAGE:

DRG No: ISSUE: SHEET: OF

C4788 1 1

1

13

R44

10K 1% 0805

13

R45

10K 1% 0805

R42

10K 1% 0805

R43

10K 1% 0805

R66

MIXR

MIXL

AUX1

AUX2

Q5 BC549

R63 0R0 0805