Microprocessor Back-Up; Lithium Battery; Microprocessor Reset; Ordering Spare Parts - Kenwood TS-440S Instruction Manual

Probable cause
1. Low AC line voltage.
2. RF gain control closed.
Symptom
The S-meter deflects and stays at a
certain position even with no signal.
1. Use a step-up transformer to raise the
line voltage.
Use a 12 to 16V battery.
~. Turn the RF gain control fully
clockwise.
I
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
cut or low cut.
IF SHIFT control is wrong adjusted.
Set the control to the center (click po.
sition).
LOCK switch is ON
I
Set F. LOCK switch to OFF. rrequency is not changed by pressing
the BAND switch or turning the tuning
control.
-
Memory channel is 6 and 7 or 8 and 9 are
empty.
Program scan fails
Memory scan fails.
Display goes out with VFO/M ON
Memory is empty.
When nothing is stored in the memory
channel, a channel is displayed and
blanked with only the decima! point dis-
played.
Store the frequency
TRANSMISSION
Corrective action
Probable cause
Symptom
No output in sse (RF and ALC meters
do not deflect.)
1. Open microphone cable or bad
microphone.
2. Low microphone gain.
1. Check the microphone.
2. Increase the MIC gain control.
See section 3-1-2, VOX GAIN control
VOX does not operate. 1. VOX GAIN control too low.
2. ANTI VOX control requires ad.
justment.
ANTI VOX control requires adjustment.
VOX trips by speaker output.
I\JO output in CW
I The key plug is incompletely inserted or
KEY contact failure.
Linear amplifier does not key.
.Internal connector was not moved.
2.. REMOTE connector is miswired, or has
a poor contact.
See section 3-1-2, ANTI VOX control.
1. Insert the key plug fully.
2. Turn the CAR control clockwise.
11. Move the connector as described ir.
section 5-8-10.
2. C~~;;~~ ~~i~;.' I
5-6. MICROPROCESSOR RESET
When the microprocessor has functioned erroneously
or when setting the transceiver in the initial state,
switch on the power with the A = B switch pressed.
5-5. MICROPROCESSOR BACK-UP LITHIUM
BATTERY
A lithium battery is contained in the transceiver to retain
memory. Turning off and POWER switch, disconnec-
ting the power cable, or a power failure will not erase
the memory. The battery should last for approximately
five years. When the battery discharges, an erroneous
display may appear in the display. Lithium battery
replacement should be performed by an authorized
KENWOOD service facility; either your KENWOOD
dealer, or the factory, since this unit contains CMOS
type circuitry.
5- 7. ORDERING SPARE PARTS
When ordering replacement or spare parts for your
equipment, be sure to specify the following:
Model and serial number of your transceiver. Schematic
number of the part. Printed circuit board number on
which the part is located, part number and name, if
known, and quantity desired. Part numbers for most
replacement parts is contained in the service manual
(available as an option from your dealer).
Notes:
1. When the lithium battery is replaced, the
microprocessor must be reset, using the procedure
in section 5-6.
2. When the lithium battery fails. the radio's microcod-
ed functions are NOT affected. Only information
stored in memory will be cleared.
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