6
DR128 SERVICE MANUAL
Removing the front panel 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.
1.) Working from the front of the unit remove the 6 cover screws and remove the cover.
2.) Unplug the harnesses to the front panel circuit board assembly.
3.) Remove any DSP expander cards fitted to the microprocessor circuit board.
3.) Remove the 8 circuit board fixing screws and carefully ease the assembly clear of the microprocessor
circuit board and clear of the unit.
The front panel LCD display circuit board is mounted onto the front panel circuit board assembly and can
be removed by unscrewing the 4 mounting screws.
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 front panel circuit assemblies, follow
the above procedure in reverse order. Make sure all LEDs and harnesses are correctly aligned and inserted
correctly. Test for correct operation.
Front Panel
board assembly
DSP Expander
board assembly
Service Procedures
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