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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 max. 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
¾ The PA not turn on, nothing happens ON switch is pushed.
ƒ
External AC wiring, fuse or circuit breaker may be open.
ƒ
Amplifier power connector not in place - cover safety interlock open.
ƒ
Fuse F1, F2, F4 open or missing - check fuses with an ohmmeter.
¾ The PA turns ON but no HV is indicated by the LED bargraph.
ƒ Possible HV circuit fault.
ƒ Fuse in power supply damaged.
¾ No idle current when you push the PTT (about 100 mA on the IP bargraph).
ƒ No Ua voltage. Check the protection resistor on side of RF box or fuse on HV PCB.
(6,8 Ohm, 1.25A) Check F3 catode fuse of tube in the rear panel.
¾ The idle current is too low or too high.
ƒ Check the Q1 (BD249C transistor and the zener stabilizer unit on UCU-01 PCB, you
can set the needed value with poti P6). Please set 80- 100mA idle current. Check
Q7,Q8 transisitors on UCU-01 board if you not able to set the idle current.
¾ You can indicate normal Ip current on LED bargraph when drive PA but no output power.
ƒ 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 valve(s).
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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