Copyright © 2007 Allen & Heath Limited. All rights reserved
Kernick Industrial Estate, Penryn, Cornwall, TR10 9LU, UK
ALLEN&HEATH
SERVICE MANUAL
GL2800M
Allen & Heath Limited
http://www.allen-heath.com
Limited One Year Warranty
ALLEN&HEATH GL2800M service manual AP7177 Issue 2 Page - 1 - of 13
This product is warranted to be free from defects in materials or workmanship for period of
one year from the date of purchase by the original owner. To ensure a high level of
performance and reliability for which this equipment has been designed and manufactured,
read this User Guide before operating. In the event of a failure, notify and return the
defective unit to ALLEN & HEATH Limited or its authorised agent as soon as possible for
repair under warranty subject to the following conditions
Conditions of Warranty
The equipment has been installed and operated in accordance with the instructions in this
User Guide. The equipment has not been subject to misuse either intended or accidental,
neglect, or alteration other than as described in the User Guide or Service Manual, or
approved by ALLEN & HEATH. Any necessary adjustment, alteration or repair has been
carried out by ALLEN & HEATH or its authorised agent. This warranty does not cover fader
wear and tear. The defective unit is to be returned carriage prepaid to ALLEN & HEATH or its
authorised agent with proof of purchase. Units returned should be packed to avoid transit
damage. In certain territories the terms may vary. Check with your ALLEN & HEATH agent
for any additional warranty which may apply.
For further assistance please contact our distributor or your territory.
http://www.allen-heath.com/UK/distributors.asp
DEVELOPMENT CHANGES
Release notes for this issue
CONTENTS
ALLEN&HEATH GL2800M service manual AP7177 Issue 2 Page - 2 - of 13
SERVICING PRECAUTIONS AND GENERAL NOTES
PARTS IDENTIFICATION
• How to order parts
• Exterior parts
• Interior parts
BLOCK DIAGRAM
CIRCUIT DIAGRAMS
SOFTWARE & FIRMWARE
SPECIFICATION
ALLEN&HEATH GL2800M service manual AP7177 Issue 2 Page - 3 - of 13
DEVELOPMENT CHANGES
ALLEN&HEATH GL2800M service manual AP7177 Issue 2 Page - 4 - of 13
PARTS IDENTIFICATION
Parts must be ordered from our distributor in your territory. A list of international
distributors can be viewed at http://www.allen-heath.com/UK/distributors.asp
UK parts must be ordered through an appointed A&H dealer or service centre. A list of UK
service centres can be viewed at http://www.allen-heath.com/UK/service_centres.asp
How to order parts
EXTERIOR PARTS:
Push button square
red AJ2961JIT
Knob red
AJ2074AJIT
Push button
square grey
AJ2864JIT
Knob green
AJ2074AJIT
Knob grey
AJ2078AJIT
Knob black
AJ6106AJIT
Push button
rect black
AJ3228JIT
Push button
rect grey
AJ2865JIT
Knob brown
AJ2080AJIT
Knob light blue
AJ2075AJIT
Knob dark blue
AJ2075AJIT
Knob yellow
AJ2079AJIT
Push button square
white AJ2960JIT
Push button
rect white
AJ2962JIT
Push button
round black
AJ4251JIT
Fader screw
AB2811JIT
Fader knob
black
AJ3503JIT
Fader knob
yellow
AJ8080JIT
Fader knob
light blue
AJ8081JIT
Fader knob
dark blue
AJ6237JIT
Fader knob
grey
AJ6278JIT
Fader knob
red
AJ8079JIT
Fader knob
brown
AJ6692JIT
Fader knob
green
AJ6691JIT
ALLEN&HEATH GL2800M service manual AP7177 Issue 2 Page - 5 - of 13
POTENTIOMETERS & FADERS
Gain
AI3838
EQ frequency
AI8005
EQ boost/cut
AI8004
Aux
2
4
6
8
10
12
14
16
AI6718
Mono fader PCB
assembly 003-613
EQ frequency
AI8005
EQ boost/cut
AI8004
HPF
AI8009
Aux
1
3
5
7
9
11
13
15
AI8006
Mix master fader
PCB assembly
003-614
Big headphone
AL5903
Small headphone
3.5mm AL5323
Talkback
AI8004
Osc/noise
AI8111
Headphone
AI8007
PFL trim
AI8004
EXT IN
AI8007
Attention
Alps faders
shown.
Some units may
have Panasonic
faders.
See page 9-13
ALLEN&HEATH GL2800M service manual AP7177 Issue 2 Page - 6 - of 13
Ident strip 17-24
AK6474JIT
Feet
AK0102JIT
XLR4 pin
AL8104
XLR screw
AB2810
Ident strip 9-16
AK6473JIT
Push button tall
grey
AJ8071JIT
Ident strip 1-8
AK6472JIT
1 234567 8
ALLEN&HEATH GL2800M service manual AP7177 Issue 2 Page - 7 - of 13
INTERIOR PARTS:
Master connector
003-612JIT
Master 1
003-609JIT
Master 2
003-610JIT
Power connector
003-372JIT
Headphone socket
AL6264
4M connector
003-611JIT
Screw (base)
AB2809
Mono i/p
003-607JIT
Mix master
003-608JIT
ALLEN&HEATH GL2800M service manual AP7177 Issue 2 Page - 8 - of 13
IDENTIFY PANASONIC FADERS / ALPS FADERS BY MIXER SERIAL NUMBER
List of mixer serial numbers using Panasonic Faders on Mix Masters to date 15109106:
L28MON24002847
L28MON32002932
L28MON32002934
L28MON32002935
L28MON32002936
L28MON40002944
L28MON40002945
L28MON24002949
L28MON24002950
L28MON40002951
L28MON40002952
L28MON48002983
L28MON32002985
L28MON24003012
L28MON24003013
L28MON24003014
L28MON24003015
L28MON32003017
L28MON32003019
L28MON40003026
L28MON40003027
L28MON40003028
L28MON40003031
ALLEN&HEATH GL2800M service manual AP7177 Issue 2 Page - 9 - of 13
List of mixer serial numbers using Panasonic Faders on Mix Masters to date 5110106:
L28MON24002847
L28MON32002932
L28MON32002934
L28MON32002935
L28MON32002936
L28MON40002944
L28MON40002945
L28MON24002949
L28MON24002950
L28MON24003012
L28MON24003013
L28MON24003014
L28MON24003015
L28MON3200298s
L28MON32003017
L28MON32003019
L28MON32003055
L28MON32003063
L28MON32003064
L28MON320031 13
L28MON40002951
L28MON40002952
L28MON48002983
L28MON40003026
L28MON40003027
L28MON40003028
L28MON40003029
L28MON40003031
L28MON40003048
L28MON40003052
L28MON40003055
L28MON400031 19
ALLEN&HEATH GL2800M service manual AP7177 Issue 2 Page - 10 - of 13
GL2800Ms with Panasonic faders on whole mixer.
L28MON40003144
L28MON32003132
L28MON40003149
L28MON40003146
L28MON48003161
L28MON32003134
L28MON40003145
L28MON40003142
L28MON32003128
L28MON48003206
L28MON48003207
L28MON48003209
L28MON40003152
L28MON32003191
ALLEN&HEATH GL2800M service manual AP7177 Issue 2 Page - 11 - of 13
SPECIFICATION:
Performance
Maximum XLR input level +34dBu (inc pad)
Maximum XLR output level +26dBu
Internal headroom Channels +20dB, Mix +22dB
Master meters 12 segment -30 to +16dB, 0VU= +4dBu XLR
Channel meters 4 segment -12,0,+6+16dB (5dB before clip)
Frequency response 20Hz to 50kHz +0/-1dB
Mic CMRR at 1kHz > 80dB typical
THD+n at +14dBu 1kHz Mic to mix out < 0.003%
Crosstalk at 1kHz Fader shutoff >90dB
Mute shutoff >88dB
Inter channel >90dB
Noise, rms 22Hz to 22kHz Mic EIN -128dB
Residual output noise < -96dBu (-100dB S/N)
Mix noise 24 channels < -80dBu (-84dB S/N)
Channel HPF Switched 100Hz, 12dB/octave
Output HPF Swept off to 400Hz, 12dB/octave
Channel EQ HF Shelving +/-15dB, 12kHz
HM Peak/dip +/-15dB, 500Hz to 15kHz, Q=1.8
LM Peak/dip +/-15dB, 35Hz to 1kHz, Q=1.8
LF Shelving +/-15dB, 80Hz
Mix 1-8 EQ HM Peak/dip +/-15dB, 500Hz to 12kHz, Q=1.6
LM Peak/dip +/-15dB, 80Hz to 2kHz, Q=1.6
Power supply External RPS11 IEC input
External Input for optional RPS11 backup supply
Connections
Channel XLR balanced pin 2 hot Sensitivity -60 to +14dBu
Total gain range 74dB
20dB Pad out 2k ohm, in >10k ohm
Wedge Ext in XLR balanced pin 2 hot >10k ohm, 0dBu, +20dBu max
IEM Ext in TRS unbalanced >10k ohm, 0dBu, +20dBu max
Talkback mic XLR balanced pin 2 hot Sensitivity -50 to -10dBu
Phantom power Internal jumper +48V (fitted)
Inserts Channel TRS, tip send, ring return, 0dBu
Output TRS, tip send, ring return, -2dBu
Mix 1-16 out XLR balanced pin 2 hot <75 ohm, +4dBu, +26dBu max
IEM/Wedge out XLR balanced pin 2 hot <75 ohm, +4dBu, +26dBu max
Talkback/Osc out XLR balanced pin 2 hot <75 ohm, +4dBu, =26dBu max
Headphones TRS, tip L, ring R, 30 to 600 ohm headphones recommended
Lamp 4-pin XLR max 12V 5W lamp
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ALLEN&HEATH GL2800M service manual AP7177 Issue 2 Page - 13 - of 13
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