Troubleshooting Guide; Memory Backup; Processor Reset - Harman Kardon HK3480 Service Manual

HK3480

TROUBLESHOOTING GUIDE

This unit is designed for trouble-free operation. Most problems users encounter are due to operating errors. So, if you have a problem, first check this list for a possible solution.
If the problem persists, consult your authorized Harman Kardon service center.
If the problem is . . .
No lights appear when POWER button is pressed
No sound is heard
No output from one or more channels
Tuner sound has a large amount of interference, or
The "Stereo" display is not illuminated, or
Tuner sound distorts and/or volume level is too low
Tuner is intermittent or continuously buzzing or hissing
Remote does not function correctly
Cassette or CD sounds distorted
Turntable sounds distorted
No video image

Memory Backup

This product is equipped with a non-volatile EEPROM (Electrically Erasable and Programmable Read-Only
Memory) that preserves tuner presets and system configuration information without the unit being connected to
a main power source for any prolonged period of time.

Processor Reset

In the rare case where the unit's operation or the displays seem abnormal, the cause may involve the erratic
operation of the system's memory or microprocessor.
To correct this problem, first unplug the unit from the AC wall outlet and wait at least thirty minutes. After the
pause, reconnect the AC power cord and check the unit's operation. If the system still malfunctions, a system
reset may clear the problem. To reset the system, first turn the HK 3480 off by pressing the System Power
Control. Next, press and hold the front-panel Mute Button for at least 4 seconds. The Main Information Display
will briefly show the word RESET, and then return to normal operation. When the system is reset in this
fashion, all tuner presets will be lost and must be reentered. If the system is still operating incorrectly, there
may have been an electronic discharge or severe AC line interference that has corrupted the memory or
microprocessor. If these steps do not solve the problem, consult an authorized Harman Kardon service center.
Make sure that the . . .
Unit is plugged into a live outlet
Unit has not been muted
Correct input function selector button has been pressed
Volume is turned up
Speakers have been turned on using the Speaker Selectors
Headphones are not in use
Jumper pins are in place, unless an external amplifier is in use
Cables are not defective: check/replace speaker cables
Antenna is properly connected
Antenna is properly located
Antenna is set in the proper direction
Antenna is adequate to receive the desired station
Unit is away from fluorescent lights, TVs, motors and
other electrical appliances
Batteries are not weak, and replace them if necessary
Room lighting is not overly bright
Cassette deck or CD player has not been plugged into the Phono Input ™
(only use the outputs of a turntable or tone arm with the Phono Input ™)
Turntable has been plugged into the Phono Input ™,
as the other inputs are not compatable with turntable signal levels
Video source unit's video ouput is properly connected, the source is turned on and the correct video
input on the HK 3480 has been selected
Video Monitor Output · is connected to a TV or video display, and that the TV is turned on and the
proper input on the TV has been selected
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harman/kardon
TROUBLESHOOTING GUIDE 17