Kenwood MD-RECEIVER KMD-870R - Manual (Page 33)

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What might appear to be a malfunction in your unit may just be the result of slight misoperation or miswiring. Before
calling service, first check the following table for possible problems.
Troubleshooting Guide
SOLUTION POSSIBLE CAUSE PROBLEM
A speaker cable may be pinched by a screw in the car. Check the speaker wiring.
No sound can be heard, or the
volume is low.
The fader and/or balance settings are set all the way to
one side. Reset the fader and/or balance settings.
The input/output cables or wiring harness are connected
incorrectly. Reconnect the input/output cables and/or the wiring harness
correctly. See the section on "Connecting Cables to
Terminals".
Nothing happens when the
buttons are pressed. The computer chip in the unit is not functioning normally. Press the reset button on the unit (see page 4).
The sound quality is poor or
distorted.
The speakers are not wired correctly. Reconnect the speaker cables so that each output terminal
is connected to a different speaker.
The antenna control cable is not connected. Connect the cable correctly, referring to the section on
"Connecting Cables to Terminals".
Radio reception is poor. The car antenna is not extended. Pull out the antenna all the way.
The power does not turn on. The fuse has blown. After checking for short circuits in the cables, replace the
fuse with one having the same rating.
The Attenuator function is turned on. Turn off the Attenuator function.
No ACC position on vehicle ignition. Connect the same cable to the ignition as the battery cable.
The memory is erased when
the ignition is turned off. The battery cable has not been connected to the proper
terminal. Connect the cable correctly, referring to the section on
"Connecting Cables to Terminals".
The TEL mute function does
not work. The TEL mute cable is not connected properly. Connect the cable correctly, referring to the section on
"Connecting Cables to Terminals".
The ignition and battery cable are incorrectly connected. Connect the cable correctly, referring to the section on
"Connecting Cables to Terminals".
The TEL mute function turns on
even though the TEL mute
cable is not connected. The TEL mute cable is touching a metal part of the car. Pull the TEL mute cable away from the metal part of the car.
MD mode cannot be set. The faceplate was closed whilst the MD was being
ejected. Press the eject( 0) button and reinsert the MD.
The MD cannot be inserted. There is already an MD loaded. Eject the currently loaded MD and then load the new one.
The MD does not load. The insertion orientation of the MD is incorrect or the MD
is upside down. Insert the MD in the proper orientation.