Table of contents
HF SSB Transceiver 9323/9360/9390/9780 Technical Service Manual v
5 Maintenance
General ................................................................................................................. 5-1
CMOS devices............................................................................................ 5-1
Circuit boards..............................................................................................5-2
Transmitter precautions .............................................................................. 5-3
Probe precautions........................................................................................ 5-4
Surface mounted components..................................................................... 5-4
Dismantling and assembling ................................................................................5-5
Top and bottom covers ...............................................................................5-5
Rx/Exciter PCB ..........................................................................................5-6
Microprocessor and Audio PCB.................................................................5-6
PA and Filter assembly...............................................................................5-6
Front panel.................................................................................................. 5-8
Control head................................................................................................5-9
Fault diagnosis....................................................................................................5-10
General...................................................................................................... 5-10
Voltage measurements..............................................................................5-11
No reception.............................................................................................. 5-12
No transmit ...............................................................................................5-13
Unlocked synthesiser ................................................................................ 5-13
PA failure..................................................................................................5-14
Replacement of PA transistors.................................................................. 5-15
Control keypad.......................................................................................... 5-16
Displayed error messages..........................................................................5-16
6 Channel additions
Programming transmit frequencies TxD/TxE......................................................6-2
Tx/Rx programming procedure............................................................................6-3
Deleting a channel................................................................................................ 6-7
7 Adjustments
Introduction..........................................................................................................7-1
Test equipment required....................................................................................... 7-2
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