18 Troubleshooting; Problems Related To Reception And Transmission - Kenwood TS-890S Instruction Manual

18 TROUBLESHOOTING

Troubleshooting
Check the following before requesting for repair of the transceiver.

Problems Related to Reception and Transmission

Symptom
Power does not turn on when [
pressed.
The screen is not displayed normally
when this transceiver is powered on.
A backup data damage detected
screen is displayed.
Signals cannot be received even
when an antenna is connected.
The RX sensitivity is low.
Signals received are not correctly
demodulated.
The frequency does not change when
the [RIT/XIT] control is turned.
The cutoff frequency of the RX audio
in the SSB mode is extremely high or
extremely low.
There is significant distortion in the
audio.
No sound is output from the speaker. The [AF] control is turned all the way to the left. Turn the [AF] control to the right.
The S meter deflection is small in the
FM mode.
"SCP.OVF" is displayed on the
bandscope.
18-2
Probable Cause
The power switch of the regulated DC power
] is
supply is not turned on.
The DC power cable is not correctly connected. Check the DC power cable to ensure that the
The DC power cable is not fully inserted.
The fuse of the DC power cable is blown.
A voltage exceeding the 13.8 V DC ±15% range
is applied.
The microcomputer is malfunctioning.
The initialization data was not configured
correctly for some unknown reason.
The squelch is closed.
The attenuator is ON.
The preamplifier is OFF.
The antenna 1/2 selection is wrong.
RX ANT is ON.
Unable to perform tuning even though the
antenna tuner is ON.
The gain level is lowered using the [RF] control. Turn the [RF] control all the way to the right.
The transverter settings are not correctly
configured.
The transverter is ON.
The operating mode is incorrectly selected.
The AGC function settings are not correctly
configured.
The RIT/XIT function is OFF.
The RX DSP filter settings are not suitable for
operation.
The AGC function is OFF.
The [AF] control is set to a loud volume level.
The [SQL] control is turned all the way to the
right.
Headphones are connected.
CTCSS is set to ON in the FM mode.
The S meter sensitivity level is low.
The bandscope is receiving excessive signal.
Corrective Action
Set the power switch to ON.
polarity is correct. (Red: +, black: -)
Ensure that the cable is fully inserted.
Address the cause of the blown fuse and
replace it with a new fuse according to the
designated capacity.
Check the output voltage of the regulated DC
power supply and configure it to the rated
voltage (DC 13.8 V).
Reset this transceiver.
Press F4 [OK] on the "backup data damage
detected screen" to perform Full Reset again.
Turn the [SQL] control and adjust accordingly.
Set the attenuator to OFF.
Set the preamplifier to ON.
Select the correct antenna.
Check whether RX ANT is set to ON.
Press and hold [AT] to perform tuning.
Alternatively, stop the tuning operation.
If the transverter is ON, check whether the
settings are correctly configured and whether it
is functioning properly.
If the transverter is ON, check whether it is
functioning properly.
Try switching to a different mode.
Configure the AGC function settings correctly.
Press [RIT] or [XIT].
Change them to the appropriate settings.
Set the AGC function to ON, or turn the [RF]
control to adjust RF gain.
Turn the [AF] control to adjust the volume.
Turn the [SQL] control to the left.
Unplug the headphones.
Set CTCSS to OFF.
Configure the S meter sensitivity to "High" in
Menu [0-07].
Use the attenuator for the bandscope.
Refer to
4-1
1-1
1-1
17-4
1-1
17-1
4-2
6-1
5-6
4-10
4-10
4-11
4-2
16-15
16-15
4-4
5-2
5-7
6-2
5-2
4-2
4-2
4-2
1-2
5-30
4-10
7-1