Incase Of Difficulty - Kenwood TS-680S Instruction Manual

6-4. IN CASE OF DIFFICULTY
The problems described in this table are failures
caused in general by improper operation or connec-
RECEPTION
tion of the transceiver,
Examine and check according to the
following table. If the problem persists, contact an
ponents.
not by defective com-
authorized agent or service station.
Symptom
Probable cause
Corrective action
Indicators do not light and no receiver
noise is heard when the POWER switch
is turned on.
1. Bad power cable or connections.
2. Blown power supply fuse.
3. Power supply is OFF.
+. Check cables and connections.
2. Check for the cause of the blown
fuse and replace the fuse. :
Nothing is displayed or wrong digits are
displayed when the POWER switch is
turned on.
The micraprocessor may malfunction «
if the input voltage is tao low.
. Use a step-up transformer to raise
the line voltage.
Use a 12 V to 16 V battery.
2. Tum on the POWER switch while
depressing the A=8 (or A/B) key,
and then release the A=B (or A/B)
key.
When you press the POWER switch,
"14 MHz USB'' is displayed ...or the
receive sensitivity is low.
| The backup battery voltage is low.
Please refer to Section 4-4-1.
No signal is received even when the
antenna is connected aor the receiving
sensitivity is low.
1. SQL control fully clockwise.
2. The ATT switch is ON. .
3. The standby switch is in the SEND |
Pasition.
4. Microphone PTT switch is in the
transmit position.
5. No optional CW filter is installed
and the mode switch is in the CWN
position.
1. Turn the SQL control counter-
clockwise.
2. Set the ATT switch off.
3. Set standby switch to REC.
4. Set the PTT switch to the receive
position.
5. Select a different mode.
An antenna is connected, but no signal
is received and the S-meter fully
' deflects.
RF GAIN control is too tow, decreasing
the high frequency circuit gain.
Turn the RF GAIN controf MAX posi-
tion.
The S-meter deflects and stays at a cer-
tain position even with no signal.
1, Low AC line voltage.
2. RF GAIN control closed.
1. Use a step-up transformer to raise
the line voltage.
Use a 12 V to 16 V battery.
2. Turn the RF GAIN control MAX
position.
Signal is received, but no sound is
heard.
MODE key position is incorrect.
Change the MODE key to the correct
mode.
SSB received signal is extremely high
IF SHIFT control is wrong adjusted.
Set the control to the center (click
position}.
cut of low cut.
Frequency is not changed by pressing
the UP/DOWN switches, turning the
TUNING knob, or M.CH/VFO CH con-
trol.
F.LOCK key is ON.
Set F.LOCK key to OFF.
Memory scan fails.
Nothing is stored in memory.
Display goes out with VFO/M ON.
When nothing is stored in the memory
channel, a channel is displayed and
blanked with only the decimal point
displayed.
Store the frequency.
Note:
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