Kenwood TS-870S Troubleshooting, Maintenance, Problem Symptom, Probable Cause, Corrective Action

12 MAINTENANCE

TROUBLESHOOTING

The problems described in this table are commonly encountered operational malfunctions. These types of difficulties are usually caused by improper hook-up, accidental incorrect control settings, or operator error due to incomplete programming. These problem symptoms are not caused by circuit failure. Please review this table, and the appropriate section(s) of this instruction manual, before assuming your transceiver is defective.

Note:

◆Due to frequency relationships of some circuits in this transceiver, beat tones may be heard on the following frequencies: 10.000 MHz, 20.000 MHz, 30.000 MHz. This is not a fault.

◆Placing a powered handy transceiver near this transceiver may cause noise in the TS-870S.

Problem Symptom		Probable Cause		Corrective Action	Page
					Ref.
The transceiver will not		1 The DC power supply is not switched ON.	1 Switch ON the DC power supply.		19
power up after		2 The power cable is faulty.	2	Inspect the power cable. Confirm	3
connecting a 13.8 V DC				polarities are correct.
power supply and
				Red: positive (+); Black: negative (Ð).
pressing [	] (POWER).
		3 The power cable is not connected	3 Confirm the power connector is locked		3
Nothing appears on the
		securely.		against the transceiver Rear Panel.
Display, and no receiver
				Confirm the connections to the DC
noise is heard.
				power supply are secure.
		4 A power cable fuse is open.	4 Look for the cause of the blown fuse.		3
				After inspecting and correcting any
				problems, install a new fuse with the
				same rating.
After switching ON the		1 The input voltage is outside 13.8 V DC	1	Correct the input voltage. Use a step-	3
power, the transceiver		±15% (11.7 to 15.8 V DC).		up transformer, if necessary, to raise the
does not function				input line voltage to the DC power
normally. For example,				supply. Or, use a 12 to 16 V battery.
no digits or incorrect		2 The microprocessor has malfunctioned.	2	Review "MICROPROCESSOR RESET".	63
digits appear on the				After understanding what data will be
Display.
				lost, do a Partial Reset. If the problem
				remains, do a Full Reset.
After switching ON the		The backup lithium battery voltage is too	Obtain a new battery from your dealer or a		54
transceiver,		low.	KENWOOD Service Center.
"14.000.00 MHz USB" is
displayed when you have
NOT done a Full Reset.
The transceiver does not		1 Procedures are not being followed	1	Review "WRITING CONVENTIONS	Inside
respond correctly after		precisely.		FOLLOWED".	Front
					Cover
you press button or key		2 The Lock function is ON.	2 Press [F.LOCK] to turn OFF the Lock
					64
combinations, or turn
				function.
controls per instructions
		3 The microprocessor and its memory	3	Review "MICROPROCESSOR RESET".	63
in this manual.
		need resetting.		After understanding what data will be
				lost, do a Partial Reset. If the problem
				remains, do a Full Reset.
Menu Nos. cannot be		The Quick Menu function is ON (ÒMHzÓ is	Press [1MHz] to cancel the Quick Menu		24
selected in Menu mode.		lit).	function.
The frequency cannot be		The Lock function is activated.	Press [F.LOCK] to switch OFF the function.		64
changed.
Turning the RIT/XIT		The Receive Incremental Tuning function is	Press [RIT] to switch ON the function.		44
control has no affect on		switched OFF.
the receive frequency.
SSB audio quality is very		1 The filter for Digital operation is	1 Switch Menu No. 19 (PKT.FIL) to OFF.		25
poor; the high or low		selected.	2 Turn the LO/WIDTH control		51, 52
audio frequencies are		2 The LO/WIDTH control or HI/SHIFT		counterclockwise and the HI/SHIFT
absent.
		control is set incorrectly.		control clockwise.

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