Kenwood TS-990S User Manual
Page 278
18 TROUBLESHOOTING
18-8
Symptom
Common Problem
What to do
Ref. Page
No transmission.
Low transmit power level.
Incomplete connection of the
microphone connector.
Connect the microphone securely to the
Microphone connector.
Poor connection of the antenna
connector.
Connect the antenna securely to the ANT 1 to
ANT 4 connector.
The microphone gain is low.
Adjust the microphone gain using the MIC
control.
The transmit power is minimized.
Adjust the transmit power using the PWR
control.
The temperature protection activates.
Stop transmitting to cool down the transceiver.
Carrier level is too low.
Rotate the CAR control to adjust until the ALC
meter readout indicates the appropriate range.
Output level from the speech processor
is too low.
Rotate the PROC IN, PROC OUT, or MIC
control to adjust until the ALC meter readout
indicates the appropriate range.
The selected audio source for
transmission and the audio source
entered to the transceiver are different.
Review the audio source to be modulated.
Drive Output (DRV) is active.
Press [DRV] to disable Drive Output.
A microphone is not correctly connected. Review the connection.
Keyer or paddle is not correctly
connected.
Review the connection.
Any peripheral device is not correctly
connected.
Review the connection.
The transceiver does not transmit.
The PWR meter is inactive.
The PTT switch is left and locked as On
while a stand microphone is in use.
Unlock the PTT switch.
The frequency is off band.
Select the frequency from the amateur band.
TX Inhibit is active.
Disable the TX Inhibit in Menu 6-03.
While in transmission in SSB or AM mode, the
background noise with no voice is high.
The microphone gain is too high.
Transmit your voice with observing the ALC
meter and adjust the microphone gain to
slightly activate the Automatic Level Control.
Input level of the speech processor is
high.
Rotate the PROC IN control to adjust until
the COMP meter readout indicates the
appropriate range.
The VOX function does not behaves.
The VOX gain level is too low.
Adjust the VOX gain level.
The VOX gain level is too high.
Adjust the Anti VOX Gain level.
The transmission begins even without any
operation.
The VOX function is enabled, the VOX
Gain Level is not appropriate.
Disables the VOX function, or adjust the VOX
Gain level.
The audio source entered from the rear
panel terminals is too high.
Decrease the entered signal level.
The audio signal is entered from the
connector which has been enabled as
the audio source for transmission, and
the same audio source is specified for
Data VOX.
Disable the Data VOX, or review the
configurations for audio source then adjust the
VOX Gain level.
You received a report from other station that
your audio was distorted or clipped.
The microphone gain is too high.
With the transmit monitor function, or with
having other station monitoring, adjust the
microphone gain.
Input level of the speech processor is
high.
With the transmit monitor function, or with
having other station monitoring, adjust the
input level of the speech processor.
The linear amplifier does not behave.
Poor connection to the REMOTE
connector.
Connect the amplifier securely to the
REMOTE connector.
The audio source selected for Data
VOX and the entered audio source are
different or the input signal level is low.
Review the configuration for Data VOX and
input signal level.
The control relay of the linear amplifier is
disabled.
Select "Active High + Relay Control" for the
linear amplifier control from Advanced Menu
11.
While operating in CW mode using the
linear amplifier, the Standing Wave Ratio
momentary degrades or the Automatic Level
Control abnormally activates to increase the
transmit power.
The linear amplifier, such as TL-922,
is designed to gradually increase the
transmit power.
Configure the linear amplifier by selecting
"Active High + Relay & TX Delay Ctrl"
from Advanced Menu 11 and operate the
transceiver in Semi Break-in mode.
AT-300 does not behaves.
AT-300 was connected to anything other
than the ANT 1 connector.
Connect AT-300 to the ANT 1 connector.
A fuse in the transceiver is blown.
Ensure that the fuse is genuine so as to be
replaced after the cause of the problem has
been corrected.
Modulation is insufficient (FM mode).
The microphone gain is low.
Review the configuration for Microphone Gain
in Advanced Menu 13.