Maintenance
5-6 HF SSB Transceiver 9323/9360/9390/9780 Technical Service Manual
Rx/Exciter PCB
Removing the Rx/Exciter PCB
q Disconnect the ribbon cable connector P201.
q Disconnect the Tx/Rx coaxial connectors J1 and J2.
q Remove the seven retaining screws and take out the PCB.
Re-installing the Rx/Exciter PCB
q Locate the PCB in its correct position and orientation.
q Replace the seven retaining screws.
q Connect the Tx/Rx coaxial connectors J1 and J2.
q Connect the ribbon cable connector P201.
Microprocessor and Audio PCB
Removing the Microprocessor and Audio PCB
q Disconnect all cable connectors to the PCB.
q Remove the screw securing the heatsink block to the side panel.
q Remove the seven retaining screws and take out the PCB.
Re-installing the Microprocessor and Audio PCB
q Locate the PCB in its correct position and orientation.
q Replace the seven retaining screws.
q Replace the screw used to secure the heatsink block to the side panel.
q Connect all cable connectors to the PCB, ensuring correct orientation.
PA and Filter assembly
Accessing the PA and Filter PCB
q Remove the bottom cover (see page 5-2, Circuit boards).
q Remove the eight screws securing the screen cover to the PA assembly and
remove the cover.
The PA output transistors can be replaced without removing the PCB from the
heatsink (see page 5-15, Replacement of PA transistors).
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