PCS Cybermax FM+ 15W DSP Manual page 18

PROBLEM DESCRIPTION
LCD display keeps showing
TEMP/SWR error warning
Red LED constantly on
Audio too quiet
Audio too loud
Audio without any treble
Unit blows fuses and draws
excessive current
Power supply is blinking
Audio distortion on high peaks,
for example on "s" sound.
There is HUM in audio
Loss of settings after power off
Output power less than expected
Output power less than expected
Output power less than expected
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POSSIBLE SOLUTIONS
1. Unit is probably over-heating or your antenna is faulty. Let the unit cool off and
ensure proper cooling in the future. Perhaps you adjusted TEMP ALARM too low,
set it slightly higher.
2. It is very likely that your antenna is not working correctly, check cable and check
SWR
1. High SWR. Check SWR and adjust antenna, if needed
2. Wait a few seconds. Unit turns this LED on when changing frequency just for a
few seconds until VCO stabilizes. This is normal behavior also at power-up.
1. Open the top lid and open the modulation trimmer on MAX PRO 30000+
exciter board a little bit.
2. Increase level on your audio source a little bit, start using software or hardware
compressor
Open the top lid and close the modulation trimmer on MAX PRO 30000+ exciter
board a little bit.
Set pre-emphasis to either 50uS or 75uS. If you're using stereo model, enable pre-
emphasis there (see manual for stereo encoder module , SE5000 or SE3000).
You have managed the impossible: You have burned the output transistor. You've
probably tried to squeeze out more output power by using higher supply voltage
above 15V or even changing the bias current. It is time to order a replacement final
transistor and get the soldering iron. Next time think twice about doing these things.
Probably the same thing as above. Blinking power supply means its protection is
shutting it off and back on, probably due to excessive current draw caused by
burned final.
Your audio input level is slightly too high, reduce input audio level slightly at your
audio source. Use some kind of compressor to remove over-modulation peaks.
- Move antenna as far away from the transmitter and audio gear as possible
- Use balanced audio inputs (XLR audio connectors) rather than RCA
- Make sure SWR is low
- Keep audio cables short and away from antenna and RF coaxial cable
- Form a coil from coaxial cable going to the antenna, make a few turns. This stops
RF currents that might be flowing on the outer braid of the coaxial cable. This
usually happens when you connect unbalanced cable to balanced antenna without
proper BALUN (balanced-unbalanced converter) resulting in coaxial cable
becoming part of the antenna and radiating RF energy as well...causing hum.
Check firmware version and contact our support for upgrade options.
We set our transmitters to work best with our 15V power supply. If you intend to
use 11-12V you can increase bias current a little bit, this is done with the blue
trimmer next to the output transistor.
If unit is overheating it will start reducing output power, make sure it is sufficiently
cooled!
Units can have slightly reduced output power at the band edges around 88 and 108
MHz. You can improve performance by tweaking coils in filter a little bit.