Kenwood TS-440S manual Ordering Spare Parts, Mode, Microprocessor BACK-UP Lithium Battery

Symptom

The S-meter deflects and stays at a certain position even with no signal.

Probable cause

1.Low AC line voltage.

2.RF gain control closed.

1.Use a step-up transformer to raise the line voltage.

Use a 12 to 16V battery.

~.Turn the RF gain control fully clockwise.

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 po.
cut	or low cut.						sition).
rrequency		is	not changed by pressing	LOCK	switch	is ON	Set	F. LOCK switch	to	OFF.
the BAND switch or turning the tuning
control.						-
Program		scan	fails	Memory	channel	is 6 and 7 or 8 and 9 are
				empty.
Memory		scan	fails.	Memory	is empty.

Display goes out with VFO/M ON When nothing is stored in the memory Store the frequency channel, a channel is displayed and

blanked with only the decima! point dis- played.

TRANSMISSION

Symptom	Probable	cause	Corrective action
No output in sse (RFand ALC meters	1. Open microphone	cable or bad 1.	Check the microphone.
do not deflect.)	microphone.	2.	Increase the MIC gain control.

2.Low microphone gain.

VOX

does

not operate.

1. VOX GAIN control too low.

See section

3-1-2, VOX

GAIN

control

2. ANTI VOX control requires ad.

justment.

VOX

trips

by speaker

output.

ANTI VOX control requires adjustment.

See

section 3-1-2, ANTI

VOX

control.

I\JO output

in CW

I The

key plug is incompletely

inserted or

1.

Insert

the

key

plug

fully.

KEY

contact

failure.

2.

Turn

the

CAR

control

clockwise.

Linear amplifier does

not key.

.Internal

connector was

not moved. 11.

Move

the

connector

as described ir.

2.. REMOTEconnector is miswired, or has

section 5-8-10.

I

a poor contact.

2. C~~;;~~~~i~;.'

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.

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'smicrocod- ed functions are NOT affected. Only information stored in memory will be cleared.

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.

5-7. 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).

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