ALLEN & HEATH GL2 User manual

Publication AP0204
GL2 &
GL2S
RACK MOUNT MIXERS
FITTING INSTRUCTIONS
Issue 2 Aug 95
For information on using SYS-LINKplease refer to APPLICATIONS NOTE AP0205
SYS-LINK
EXPANDEROPTION
ToconnectoneGL2orGL2-Sconsoleasachannelexpandertoasecond
console by means of a single interconnecting cable.
Kit GL2-SL1 = SINGLE
Single option to install SYS-LINK to one GL2/GL2-S console to allow
interconnection to a second console already fitted with SYS-LINK.
Interconnectingcable not supplied.
Kit GL2-SL2 = DUAL
Dual option to install SYS-LINK to two GL2/GL2-S consoles.
Interconnectingcablesupplied.

2GL2SYS-LINKEXPANDER OPTION SHEET AP0204 ALLEN & HEATH
REMOVE4xFRONTPANELM3
SCREWS
CAREFULLYLIFTOFFTHE
BASE.
REMOVEALL THEJACKNUTS
(15mm NUTDRIVER) AND 4AB
CONNECTOR SCREWS (XLRs,
PHONOS).
REMOVE2xPOWERUNIT
SIDE M3 SCREWS.
DISCONNECT THE MAINS INPUT, UNPLUG
ALLCABLESANDREMOVETHECONSOLE
FROMTHE RACKORCASE.
INVERT THE CONSOLE
ANDREMOVE4xM3BASE
SECURING SCREWS.
REMOVE4xFRONTPANELSIDE
M3 SCREWS AND NUTS
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oo
oo
o
pp
pp
p
qq
qq
q
rr
rr
r
ss
ss
s
tt
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DONOTREMOVE
THESE3x POWER
UNITFIXINGSCREWS.
THE GL2 SYS-LINK EXPANDER OPTION
The GL2-SL1(2) option is supplied as a kit of parts to be installed in the ALLEN & HEATH GL2 or
GL2-S console. This allows console to console interconnection via the GL2 SYS-LINK connector
standard.
For information on using SYS-LINK please refer to the separate APPLICATIONS NOTE AP0205.
Access is required to the console internal assemblies. Circuit assembly and soldering is necessary.
THISWORKSHOULDONLYBECARRIEDOUTBYTECHNICALLYQUALIFIEDPERSONNEL.
1. CHECK THE CONTENTS OF THE KIT
These are listed on the PACKING SHEET AP0203 enclosed with the kit.
The option comprises a pre-tested circuit assembly with connectors and wiring harness fitted, and a
replacement plug-on IDC ribbon harness.
2. PREPARE THE WORK AREA
Tools required include a 2-point crosshead screwdriver, 5, 12 and 15mm , longnose pliers, small
wirecutters, and a fine tipped soldering iron.
3. REMOVE THE CONSOLE BASE Followthe NUMBER SEQUENCE

GL2SYS-LINKEXPANDER OPTION SHEET AP0204 3 ALLEN & HEATH
4a. FIT THE SYS-LINK CIRCUIT ASSEMBLY GL2 DIAGRAM1
Unplug and remove the existing console IDC ribbon harness.
Cut out a section of the earth busbar between stereo channels 11/12 and 13/14 leaving about 3mm
at each end.
Remove the 4x screwlocks from the front of the SYS-LINK D-connectors. Keep these to secure
the connectors after the base is refitted.
Remove the 2x M3x6mm screws from the end of the SYS-LINK assembly spacers.
PositiontheSYS-LINKassemblybetweenthestereochannels11/12and13/14. Solderthefreeends
of the green earth wires to the cut ends of the console earth busbar.
NowmounttheSYS-LINKassemblytostereochannel 11/12usingtheM3x2mmscrewspreviously
removed through the stereo board holes into the spacers.
4b. FIT THE SYS-LINK CIRCUIT ASSEMBLY GL2-S DIAGRAM 1
Unplug and remove the existing console IDC ribbon harness.
Cut out a section of the earth busbar between stereo channels 15/16 and 17/18 leaving about 3mm
at each end.
Remove the 4x screwlocks from the front of the SYS-LINK D-connectors. Keep these to secure
the connectors after the base is refitted.
Remove the 2x M3x6mm screws from the end of the SYS-LINK assembly spacers.
PositiontheSYS-LINKassemblybetweenthestereochannels15/16and17/18. Solderthefreeends
of the green earth wires to the cut ends of the console earth busbar.
NowmounttheSYS-LINKassemblytostereochannel 15/16usingtheM3x2mmscrewspreviously
removed through the stereo board holes into the spacers.
5a. SOLDER ON THE SYS-LINK WIRE HARNESS GL2 DIAGRAM 2
Lay the harness above the faders positioning each branch in place against the Group and Master
circuitassemblies.
SolderthepreparedendsoftheharnesswirestotheircorrespondingsquaresolderpadsontheGroup
assemblies. This may be done with the assemblies in place by carefully using a fine-tipped
soldering iron. Make sure the wiring pads are tinned with fresh solder first for good joints. The
suggested order is :
Group Assembly1 Pink wire, then Blue, Red, Yellow
Group Assembly 2 Pink,Blue, Red,Yellow
Lift the Master Assembly slightly from the panel to gain access to the wiring pads. Do this by
removingthemastercontrolknobs,potentiometernutsandchromejacksocketnut. Desolderthe
earth busbar from the Master assembly.
Solder the harness wires to the wiring pads on the Master Assembly as illustrated. the suggested
order is : Master Assembly Pink, Blue, Red, Yellow, Brown, Grey
Refit the Master assembly. Make sure that the jack washers, potentiometers and meter LEDs are
correctly positioned in the panel cutouts. Replace the control nuts and knobs.
Resolder the earth busbar to the Master Assembly.

4GL2SYS-LINKEXPANDER OPTION SHEET AP0204 ALLEN & HEATH
5b. SOLDER ON THE SYS-LINK WIRE HARNESS GL2-S DIAGRAM 3
Lay the harness above the faders positioning each branch in place against the Stereo Return and
L/R circuit assemblies.
SolderthepreparedendsoftheharnesswirestotheircorrespondingsquaresolderpadsontheStereo
Return assemblies. Thismaybedonewiththeassembliesinplacebycarefullyusingafine-tipped
soldering iron. Make sure the wiring pads are tinned with fresh solder first for good joints. The
suggested order is :
Stereo Return Assembly 1 Pink wire, then Blue, Red, Yellow
Stereo Return Assembly 2 Pink,Blue,Red, Yellow
Soldertheharnesswiresto thewiringpadsontheL/RAssemblyasillustrated. Thesuggestedorder
is: L/R Assembly Brown *, Grey *, Pink,Yellow, Blue, Red
* Note that the Brown and Grey wires are most easily soldered by applying the iron from the
component side of the L/R assembly which is a through hole plated PCB.
6. FIT THE IDC RIBBON HARNESS DIAGRAM 1
PlugontheIDCribbonharnesssuppliedwiththekit. Makesurethatallthepinsarecorrectlyaligned
and seated on the circuit assemblies including the SYS-LINKassembly.
Reposition the console power cable as shown in Diagram 1 to avoid it becoming trapped between
the IDC connectors and base.
7. CHECK YOUR WORK AND REFIT THE BASE
Clean out any dirt or debris. Check for correct connector seating, earth busbar and harness wire
connections,andgoodsolderjoints. Check thattheSYS-LINKassemblyanditscomponentsare
correctly secured and positioned on the stereo assembly.
Remove the stick-on covers from the D-connector cutouts in the base.
Refit the base making sure that the internal console power cable is correctly positioned.
Fit the 4x screwlocks to the D-connectors to secure them to the base panel.
8. TEST THE CONSOLE
Apply power and test the console for correct operation.
SYS-LINKmaybetestedbyprobingtheD-connectorsorconnectingtoanotherGL2 orGL2-S with
the option fitted. A standard 25way male D-type connector cable is required to interconnect
consoles.
Assemblydiagrams1,2and3,circuitdiagramandlayout,andharnessdrawingfollowforreference.