Kenwood TS-990S Instruction Manual page 278

18 TROUBLESHOOTING
Symptom
No transmission.
Low transmit power level.
The transceiver does not transmit.
The PWR meter is inactive.
While in transmission in SSB or AM mode, the
background noise with no voice is high.
The VOX function does not behaves.
The transmission begins even without any
operation.
You received a report from other station that
your audio was distorted or clipped.
The linear amplifier does not behave.
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.
AT-300 does not behaves.
Modulation is insufficient (FM mode).
18-8
Common Problem
Incomplete connection of the
microphone connector.
Poor connection of the antenna
connector.
The microphone gain is low.
The transmit power is minimized.
The temperature protection activates.
Carrier level is too low.
Output level from the speech processor
is too low.
The selected audio source for
transmission and the audio source
entered to the transceiver are different.
Drive Output (DRV) is active.
A microphone is not correctly connected. Review the connection.
Keyer or paddle is not correctly
connected.
Any peripheral device is not correctly
connected.
The PTT switch is left and locked as On
while a stand microphone is in use.
The frequency is off band.
TX Inhibit is active.
The microphone gain is too high.
Input level of the speech processor is
high.
The VOX gain level is too low.
The VOX gain level is too high.
The VOX function is enabled, the VOX
Gain Level is not appropriate.
The audio source entered from the rear
panel terminals is too high.
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.
The microphone gain is too high.
Input level of the speech processor is
high.
Poor connection 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.
The control relay of the linear amplifier is
disabled.
The linear amplifier, such as TL-922,
is designed to gradually increase the
transmit power.
AT-300 was connected to anything other
than the ANT 1 connector.
A fuse in the transceiver is blown.
The microphone gain is low.
What to do
Connect the microphone securely to the
Microphone connector.
Connect the antenna securely to the ANT 1 to
ANT 4 connector.
Adjust the microphone gain using the MIC
control.
Adjust the transmit power using the PWR
control.
Stop transmitting to cool down the transceiver.
Rotate the CAR control to adjust until the ALC
meter readout indicates the appropriate range.
Rotate the PROC IN, PROC OUT, or MIC
control to adjust until the ALC meter readout
indicates the appropriate range.
Review the audio source to be modulated.
Press [DRV] to disable Drive Output.
Review the connection.
Review the connection.
Unlock the PTT switch.
Select the frequency from the amateur band.
Disable the TX Inhibit in Menu 6-03.
Transmit your voice with observing the ALC
meter and adjust the microphone gain to
slightly activate the Automatic Level Control.
Rotate the PROC IN control to adjust until
the COMP meter readout indicates the
appropriate range.
Adjust the VOX gain level.
Adjust the Anti VOX Gain level.
Disables the VOX function, or adjust the VOX
Gain level.
Decrease the entered signal level.
Disable the Data VOX, or review the
configurations for audio source then adjust the
VOX Gain level.
With the transmit monitor function, or with
having other station monitoring, adjust the
microphone gain.
With the transmit monitor function, or with
having other station monitoring, adjust the
input level of the speech processor.
Connect the amplifier securely to the
REMOTE connector.
Review the configuration for Data VOX and
input signal level.
Select "Active High + Relay Control" for the
linear amplifier control from Advanced Menu
11.
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.
Connect AT-300 to the ANT 1 connector.
Ensure that the fuse is genuine so as to be
replaced after the cause of the problem has
been corrected.
Review the configuration for Microphone Gain
in Advanced Menu 13.
Ref. Page
{page 1-3}
{page 1-1}
{page 4-17}
{page 4-17}
{page 4-3}
{page 5-13}
{page 9-6}
{page 5-11}
{page 4-21}
{page 1-3}
{page 1-3}
{page 1-2}
{page 2-10}
{page 4-8}
{page 16-27}
{page 5-14}
{page 9-6}
{page 9-3}
{page 9-4}
{page 9-2}
{page 2-9}
{page 9-2}
{page 4-17}
{page 9-6}
{page 1-6}
{page 9-2}
{page 16-31}
{page 16-31}
{page 1-8}
{page 18-2}
{page 5-28}
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