Troubleshooting - Kenwood TS-870S Instruction Manual

Intelligent digital enhanced communications system
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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
The transceiver will not
power up after
connecting a 13.8 V DC
power supply and
pressing [ ] (POWER).
Nothing appears on the
Display, and no receiver
noise is heard.
After switching ON the
power, the transceiver
does not function
normally. For example,
no digits or incorrect
digits appear on the
Display.
After switching ON the
transceiver,
"14.000.00 MHz USB" is
displayed when you have
NOT done a Full Reset.
The transceiver does not
respond correctly after
you press button or key
combinations, or turn
controls per instructions
in this manual.
Menu Nos. cannot be
selected in Menu mode.
The frequency cannot be
changed.
Turning the RIT/XIT
control has no affect on
the receive frequency.
SSB audio quality is very
poor; the high or low
audio frequencies are
absent.
Probable Cause
1 The DC power supply is not switched ON.
2 The power cable is faulty.
3 The power cable is not connected
securely.
4 A power cable fuse is open.
1 The input voltage is outside 13.8 V DC
±15% (11.7 to 15.8 V DC).
2 The microprocessor has malfunctioned.
The backup lithium battery voltage is too
low.
1 Procedures are not being followed
precisely.
2 The Lock function is ON.
3 The microprocessor and its memory
need resetting.
The Quick Menu function is ON ("MHz" is
lit).
The Lock function is activated.
The Receive Incremental Tuning function is
switched OFF.
1 The filter for Digital operation is
selected.
2 The LO/WIDTH control or HI/SHIFT
control is set incorrectly.
Corrective Action
1 Switch ON the DC power supply.
2 Inspect the power cable. Confirm
polarities are correct.
Red: positive (+); Black: negative (–).
3 Confirm the power connector is locked
against the transceiver Rear Panel.
Confirm the connections to the DC
power supply are secure.
4 Look for the cause of the blown fuse.
After inspecting and correcting any
problems, install a new fuse with the
same rating.
1 Correct the input voltage. Use a step-
up transformer, if necessary, to raise the
input line voltage to the DC power
supply. Or, use a 12 to 16 V battery.
2 Review "MICROPROCESSOR RESET".
After understanding what data will be
lost, do a Partial Reset. If the problem
remains, do a Full Reset.
Obtain a new battery from your dealer or a
KENWOOD Service Center.
1 Review "WRITING CONVENTIONS
FOLLOWED".
2 Press [F.LOCK] to turn OFF the Lock
function.
3 Review "MICROPROCESSOR RESET".
After understanding what data will be
lost, do a Partial Reset. If the problem
remains, do a Full Reset.
Press [1MHz] to cancel the Quick Menu
function.
Press [F.LOCK] to switch OFF the function.
Press [RIT] to switch ON the function.
1 Switch Menu No. 19 (PKT.FIL) to OFF.
2 Turn the LO/WIDTH control
counterclockwise and the HI/SHIFT
control clockwise.
12 MAINTENANCE
Page
Ref.
19
3
3
3
3
63
54
Inside
Front
Cover
64
63
24
64
44
25
51, 52
71

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