Allen&Heath GL4000 SERVICE MANUAL - Manual (Page 15)

ALLEN & HEATH Section A - 10 L4DSM2
REMOVING A CONNECTOR CIRCUIT BOARD ASSEMBLY
Before beginning any service work, remove all power to the console and disconnect any signal cables where necessary.
Service work is best carried out with the console inverted on a clean work surface suitably covered to protect the console
cosmetics. Ensure adequate lighting and use the correct tools. Access to the connector circuit boards is as follows:
1.) With the console inverted, remove the base. Identify which connector board is to be removed and then
disconnect the flat flexible cables and ribbon harnesses to it.
2.) Working from the rear of the console remove the screws (A) fixing the XLR connectors to the panel but do
not remove the screws (B) fixing the panel to the chassis. Remove the 12mm hex jack nuts (C) with a suitable
tool.
3.) The circuit board assembly can now be removed from the rear panel.
NOTE: if removing a master connector circuit board assembly, unscrew the green earth wires connecting the
circuit board assembly to the chassis extrusion before lifting the circuit board clear.
When all service work is complete, remove all debris such as solder, component legs and wire clippings from inside the
console and check your work carefully before reassembly. To refit the connector circuit assembly follow the above
procedure in reverse order. Make sure all harnesses are correctly aligned and plugged on. Test for correct operation.
GL4000-824 inverted with the base cover removed.
CONSOLE FRONT
GL4000 Rear Panel View.
B
B
A
A C
C
C
C
INPUT SECTION MASTER SECTION INPUT SECTION
INPUT CONNECTOR
CIRCUIT BOARD
ASSEMBLY
INPUT CONNECTOR
CIRCUIT BOARD
ASSEMBLY
MASTER CONNECTOR
CIRCUIT BOARD
ASSEMBLY
INPUT CONNECTOR
CIRCUIT BOARD
ASSEMBLY