Index-4
Board locations, 14-6
Board removal and replacement, 14-7
1650 kHz IF board, 14-7
Antenna Tuner board, 14-9
Audio/Filter board, 14-8
Display board
, 14-12
Front panel assembly
, 14-13
Junction board, 14-13
Mixer board, 14-9
Power amplifier board, 14-9
Processor board, 14-11
Synthesizer board, 14-10
Chassis disassembly, 14-4
Component replacement, 14-15
Measurement techniques
Frequency counter, 14-4
RF power measurement, 14-2
Signal generator, 14-4
Spectrum analyzer, 14-3
Semiconductor servicing
Bipolar transistors, 14-14
Integrated circuits, 14-15
Signal and switching diodes, 14-14
Varactor diodes, 14-14
Test equipment, 14-1
Troubleshooting
Basic board fault location, 14-17
Detailed board fault location, 14-18
1650 kHz IF board, 14-20
Antenna Tuner board, 14-22
Audio/Filter board
, 14-21
Display board
, 14-22
Mixer board
, 14-20
PA board, 14-21
Processor board, 14-22
Supply voltages
, 14-18
Synthesizer board
, 14-19
General fault location, 14-16
Mixer board
Circuit description, 5-1
ALC circuit
, 5-5
AME option
, 5-6
Block diagram, 5-1
Receive path
1650 kHz mixer, 5-4
30 MHz low-pass filter, 5-3
75 MHz crystal filter
, 5-4
75 MHz IF amplifier 1, 5-4
75 MHz IF amplifier 2, 5-4
Double-balanced mixer, 5-4
LO2 buffer, 5-4
Squelch gates
, 5-3
transmit/receive switch
, 5-5
Transmit path
30 MHz low-pass filter, 5-3
75 MHz filter, 5-2
Amplifier 1.6 to 30 MHz, 5-3
Current regulator, 5-3
Down-conversion mixer, 5-3
LO1 buffer, 5-2
LO2 buffer, 5-2
Transmit/receive switch, 5-3
Tx gain controlled amplifier, 5-2
Up-conversion mixer, 5-2
Component locations, schematics and
parts list, 5-9
Component locations diagram
(738217), 5-10
Parts list (009-00301), 5-17
Schematic diagram (994173), 5-11
Connector pin assignments, 5-8
Coax cable connections, 5-9
J1 connector, 5-8
Specifications, 5-7
P
Power Amplifier board
Circuit description
, 6-1
Bias regulators, 6-2
Block diagram, 6-1
Driver amplifier
, 6-2
Final amplifier
, 6-2
Predriver amplifier, 6-2
Temperature switch
, 6-3
Component locations, schematic and parts
list
, 6-5
Component locations diagram
(738617), 6-6
Parts list (009-00403)
, 6-9
Schematic diagram (990990)
, 6-7
Connector pin assignments
J1
, 6-4
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