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Malfunctions are mostly due to improper handling, overload or similar reason.
5.1 Do not use higher input power as stated in the specification. The grid protector circuit will
usually safe the power valves, but OVERLOAD alarm will appear regularly. This may happening
often in SSB mode, especially in case of old transceivers, when the output power in SSB mode
is not adjustable. The 'MIC GAIN' knob is not fit for power reduction!
5.2 INPUT SWR
The input SWR of the Linear is lower than 1:1,5.
A well adjusted TCVR will tolerate these values without any trouble.
5.3 OUTPUT SWR
The protection of the Linear will block the transmission in case the SWR of the aerial exceed
1:2.
5.4 FAILURES
The PA not turn on, nothing happens ON switch is pushed.
External AC wiring, fuse or circuit breaker may be open.
Amplifier power cord not in place - cover safety interlock open.
Fuse F1, F2, F4 open or missing - check fuses with an ohmmeter.
The PA turns on but no HV is indicated on the Ip bargraph.
Possible HV circuit fault. (check the F3 fuse ( 1A on rear panel.)
HV sampling resistor in power supply damaged. (HV panel R23,0.47 Ohm).
No idle current when you push the PTT (about 120 mA on the Ip bargraph).
Not Ua voltage.(Push the red HV knob.If anode voltage is missing, check F3 HV fuse
(1 A fuse on rear panel.)
The idle current is too low or too high.
you can set the needed value with P6 poti on UCU-01 panel if necessary).
You can indicate normal Ip current on LED bargraph when drive PA,(6-750Ma) but no output
power.
Check the output coaxial relay.
5.5 LIMITED WARRANTY
The M+E Mechanics & Electronics will warrant that the equipment will perform substantially in
accordance with the written materials for a period of 12 month from the date of receipt and will
be free from defects in material and workmanship under normal use. This Limited Warranty is
void if failure of the equipment has resulted from accident or misapplication, any kind of
modification done, overvoltage, shipping, and in case the damage of the power valves.
Warranty repairs done only on the base of the M+E Mechanics & Electronics. Return cost will
be covered by the owner.
10
5.0 TROUBLESHOOTING
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