Maintenance
5-8 HF SSB Transceiver 9323/9360/9390/9780 Technical Service Manual
Observe the following:
• Take care to align the thermistor R34 and transistor V19 in their appropriate
hole locations in the heatsink.
• Check the mica washer is under the transistor V20.
• Ensure the screws that were removed when the PCB was being disassembled,
are installed in their correct locations.
• The screws should not be tightened until all the assembly is complete. The
screws that secure the PA transistors should be tightened last to avoid straining
the connections.
Front panel
Accessing the Display Panel PCB
q Remove the top and bottom covers (see to page 5-5, Removing the covers).
q Remove the four countersunk screws located at the sides of the front panel
(two each side).
q Disconnect the cable connector to P201 on the Microphone and Audio PCB.
q Remove the two screws securing the back screen, then remove the screen.
The PCB contains surface mounted components. These can be accessed without
removing the PCB.
Accessing the reverse side of the Display Panel PCB, microphone connector
or keypad
q Remove the two control knobs (secured by nuts under the removable caps).
q Remove the three fixing screws (the screw that secures the voltage regulator
IC9 is longer and includes an insulator).
q Carefully disconnect the three connectors and remove the PCB.
©
The replacement of the surface mounted components should not be attempted
except by a technician experienced in handling surface mounted components.
Re-installing the Display Panel PCB
q Replace the Display Panel PCB.
q Connect the three connectors to the Display Panel PCB.
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