Kenwood KRC-791 - Manual (Page 37)

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What might seem 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.
General
? The power does not turn ON. 01
✔ The fuse has blown.
☞ After checking for short circuits in the wires, replace the fuse with
one with the same rating.
✔ No ACC position on vehicle ignition. 02
☞ Connect the same wire to the ignition as the battery wire.
? If you have selected Standby mode, the power will go OFF
automatically.
03
✔ The Power OFF Timer function has been activated.
☞ If you do not want the power to go OFF automatically, cancel the
Power OFF Timer function.
? Nothing happens when the buttons are pressed. 04
✔ The computer chip in the unit is not functioning normally.
☞ Press the reset button on the unit (page 4).
? There’s a source you can’t switch. 05
✔ There’s no tape inserted.
☞ Set the media you want to listen to. If there’s no media in this
unit, you can't swhich to each source.
✔ The Disc changer isn’t connected. 08
☞ Connect the Disc changer. If the Disc changer isn’t connected to
it's input terminal, You can't switch to an external disc source.
? The faceplate does not open or close. 09
✔ The faceplate is incorrectly attached.
☞ Reattach the faceplate correctly, See the section on
the Faceplate>(page 10).
? The memory is erased when the ignition is turned OFF. 10
✔ The battery wire has not been connected to the proper terminal.
☞ Connect the wire correctly, referring to the section on
.
✔ The ignition and battery wire are incorrectly connected. 11
☞ Connect the wire correctly, referring to the section on
.
? The TEL mute function does not work. 15
✔ The TEL mute wire is not connected properly.
☞ Connect the wire correctly, referring to the section on
.
? The TEL mute function turns ON even though the TEL mute wire is
not connected.
16
✔ The TEL mute wire is touching a metal part of the car.
☞ Pull the TEL mute wire away from the metal part of the car.
? Even if Loudness is turned ON, high-pitched tone isn't compensated
for.
17
✔ Tuner source is selected.
☞ High-pitched tone isn't compensated for when in Tuner source.
? The Bass center frequency, Bass quality factor, Bass extend, Middle
center frequency, Middle quality factor, and Treble center frequency
can’t be adjusted.
19
✔ The (page 27) is set OFF.
☞ Set it ON.
? No sound can be heard, or the volume is low.
✔ The fader or balance settings are set all the way to one side. 21
☞ Center the fader and balance settings.
✔ The input/output wires or wiring harness are connected incorrectly. 22
☞ Reconnect the input/output wires or the wiring harness correctly.
See the section on .
✔ The cassette tape is bad. 23
☞ Try playing another cassette tape. If works fine, the first tape was
bad.
✔ The values of Volume offset are low. 24
☞ Increase the values of Volume offset. (page 8)
? The sound quality is poor or distorted. 25
✔ One of the speaker wires is being pinched by a screw in the car.
☞ Check the speaker wiring.
✔ The tape head is dirty. 26
☞ Clean the tape head.
✔ The speakers are not wired correctly. 27
☞ Reconnect the speaker wires so that each output terminal is
connected to a different speaker.
Troubleshooting Guide
KRC-791_U.S 01.10.29 11:54 AM Page 37