Allen&Heath GL4000 SERVICE MANUAL - Manual (Page 14)

ALLEN & HEATH Section A - 9 L4DSM2
REMOVING THE MICRO 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 or positioned upright on its rear with the connectors removed.
Ensure adequate lighting and use the correct tools. Access to the MICRO circuit board is as follows:
1.) Working from the rear of the console, remove the screw (A) near to the CHASSIS GROUND terminal on the
rear connector panel.
2.) With the console inverted or on its rear, remove the base, identify the MICRO circuit board assembly and then
disconnect the ribbon harnesses plugged into the connectors mounted along the edge of the circuit board. Also
disconnect the flat flexible cable.
3.) The circuit board can now be removed by first squeezing the tops of the mounting pillars and lifting the circuit
board clear of the pillars. Then carefully manoeuvre the circuit board assembly into a suitable position to carry
out service work. Take care not to stretch the wires soldered onto the circuit board
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 MICRO circuit board 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.
MICRO PCB
CONSOLE REAR
Ù
CONSOLE FRONT
rear panel view
A