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9.
Protection Circuits
There are five major protection functions in this amplifier. If the amplifier has shut down
for some reason, before re-setting, correct the possible cause of the shut down. Turn off
the POWER once and back on to reset.
9-1
O. DRIVE (Over Drive / Band Miss-set)
When the drive power exceeds the 100W level, the amplifier will shut down to
STAND-BY mode (or receive) in order to protect the input side of the power FET's.
This protection might also activate if the band is set wrong. This usually occurs,
when the amplifier band setting is lower than that of the transceiver.
9-2
O. HEAT (Over Heat)
When the temperature of the aluminum heat sink in the power amplifier reaches
80 degrees C, the amplifier defaults to RECEIVE mode to protect the power FET's.
9-3
O. VOLT (Over Voltage)
If there is a sudden AC line voltage spike, the FET drain voltage may rise above
acceptable levels, and O. VOLT protection may trip.
9-4
FUSE (Fuse Blown)
If either of the glass fuses (15A) on PC1662V fails, "FUSE" lamp lights. Under
normal usage of the amplifier, this failure should rarely (if ever) occur. If it occurs,
there is a possibility that the power FET's have failed together. If the amplifier
cannot be reset, consult with the dealer or the service center.
9-5
PR (Reflected Power Protection)
If reflected power from the antenna reaches approximately 80W, the PR protection
may trip. If it does, one solution is to reduce the drive power from the transceiver.
Or you may need to check that your antenna match (SWR) is still OK. If the match
cannot be corrected and the antenna system isn't faulty, use an antenna tuner.
As noted above, the amplifier is equipped with several kinds of fast acting protection
circuits using the latest in analog technology. However, if the amplifier is operated in
such a manner that multiple protections work repeatedly over a long period of time, the
amplifier can be seriously damaged.
13
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