Maintenance
HF SSB Transceiver 9323/9360/9390/9780 Technical Service Manual 5-5
Dismantling and assembling
Sometimes it is necessary to remove printed circuit boards from the transceiver in
order to carry out repairs. The paragraphs that follow provide the technician with
instructions on the removal and assembly of the circuit boards. While carrying out
these instructions observe the following:
• Screwdriver—Screws with pozidrive heads are used in almost all locations.
Use the appropriate and correct size screwdriver.
• Connectors—The ribbon cable header and multi-way connectors that are used
can be incorrectly mated with their corresponding connectors. Care must be
taken when re–installing the connectors to ensure they are correctly mated.
• To remove the screws securing the driver transistors (V21 and V22) and bias
transistor (V17) on the PA assembly, use a 1/16 inch Allen key.
Top and bottom covers
To gain access to the printed circuit boards, the top and bottom covers must be
removed from the transceiver. The process is the same for the removal of both
covers.
Removing the covers
q Unscrew the two retaining screws, one on either side of the cover.
q Unscrew the two screws that secure the relevant cover to the front surround.
q Face the front of the transceiver towards you.
q Lift the rear of the cover up and slide the cover back, withdrawing it from
the front panel.
Replacing the covers
q Face the front of the transceiver towards you.
q Slide the cover into the front surround and lower the back of the cover on to
the frame.
q Replace the two screws that secure the cover to the front surround and the
two retaining screws.
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