5
DR128 SERVICE MANUAL
Removing the CPU microprocessor circuit board assembly
Except for the battery (BAT1), there are no serviceable parts on the microprocessor circuit board assembly. If
a fault on the microprocessor circuit board is suspected then confirmation of a fault is by board replacement only
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 microprocessor circuit board assembly.
3.) Squeeze the tops of the plastic mounting pillars and ease each corner of the circuit board off each pillar.
Repeat the procedure for each pillar until circuit board assembly is free.
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 microprocessor circuit assembly
follow the above procedure in reverse order. Make sure all harnesses are correctly aligned and plugged on. Test
for correct operation.
Microprocessor
board
assembly
DSP Expander
board
assembly
Service Procedures
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