7
DR128 SERVICE MANUAL
Removing the power supply circuit board assembly
Before beginning any service work, remove all power to the unit and disconnect any signal cables where
necessary. Adopt static 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 the harnesses to the power supply circuit board assembly.
3.) Before disconnecting the transformer harness wires make a note of there colour and position on the
circuit board.
4.) Unscrew the 2 circuit board mounting screws and remove the circuit board and heatsink assembly.
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 power supply circuit assembly
follow the above procedure in reverse order. Make sure all harnesses are correctly aligned and plugged on. Test
for correct operation.
Power Supply
board assembly
Fuse - external DC input protection
Service Procedures
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