Allen&Heath DR128 SERVICE MANUAL - Manual (Page 71)

4
DR128 S
ERVICE
M
ANUAL
Removing a connector circuit board assembly
Before beginning any service work, remove all power to the unit and disconnect any signal cables where
necessary. Adopt static electricity working procedures when carrying out service work. Ensure adequate
lighting and use the correct tools. Access to the connector circuit board options can be achieved without the
removal of the circuit board assemblies. To remove the lower connector circuit board assembly the upper
assembly will have to be removed first.
1.) Working from the front of the unit remove the 6 cover screws and remove the cover.
Access to both connector circuit board options can be achieved at this stage. Refer to the
Hardware Configuration section in the Installation guide for information on changing the
connector board options.
2.) Unplug the harnesses to the connector circuit board assembly to be removed.
3.) Working from the rear of the unit, remove the connector fixing screws (A) and using a 5mm AF nut
driver remove the D type connector fixings (B).
4.) The circuit board assemblies can now be removed by carefully easing them off the plastic mounting
pillars.
When all service work is complete, remove all debris such as solder, component legs and wire clippings from
inside the unit and check your work carefully before reassembly. To refit the connector circuit assemblies, follow
the above procedure in reverse order. Make sure all harnesses are correctly aligned and plugged on. Test for
correct operation.
A
B
Upper connector
board assembly
Lower connector
board assembly
Service Procedures