User's Manual

(4) PLO Lock. Indicates that the phase locked oscillator has developed a hardware
fault.
(5) Synth Lock. Indicates that the frequency synthesiser has developed a hardware
fault.
(6) Transmitter Over-temperature. This indicates that the temperature of the RF
power transistors is high, indicating a fault in the transceiver.
8 Fault diagnosis algorithms covering these failures is provided in Figure 3.
TEST EQUIP MENT
9 Fault location is to module replacement level only. The only test equipment required for
fault finding is a high impedance Multimeter.
PREP A RA TION FOR FAULT DI AG NO SIS
WARNING
THIS EQUIPMENT IS NOT FITTED WITH SAFETY INTERLOCKS AND
LETHAL VOLTAGES ARE PRESENT WITHIN THE UNIT. ACCESS TO THE
INTERIOR OF THE TRANSCEIVER IS ONLY TO BE CARRIED OUT BY A
QUALIFIED TECHNICIAN.
CAUTIONS
(1) Handling Of Electrostatic Sensitive Semiconductor Devices.
Semiconductor devices used in the equipment are liable to damage due
to static voltage. Observe the following precautions when handling
these devices in their unterminated state, or modules containing these
devices.
Persons removing modules from an equipment using these devices
should be earthed by a wrist strap and a resistor.
Soldering irons used during repair operations must be low voltage
types with earth tips and isolated from the mains voltage by a double
insulated transformer.
Outer clothing worn must be unable to generate static voltages.
Printed Circuit Boards (PCBs) fitted with these devices must be stored
and transported in anti-static bags.
Fit new devices in a special handling area.
For detailed information, refer to British Standard BS 5783 or other
equivalent standard.
KH1264
Chap ter 6
Is sue 2 Page 6.5