Harman-Kardon HK 3470 owner manual Troubleshooting Guide, Memory Backup, Processor Reset

Operation

Memory Backup

This product is equipped with a memory backup system that preserves tuner presets and system configuration information if the unit is acciden- tally unplugged or subjected to a power out- age. The unit’s memory is stored in an EEPROM, and thus the HK 3470 will retain information such as programmed presets without being connected to a main power source virtually indefinitely.

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 three 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.

If the system still does not respond, it may be necessary to perform a complete reset. To reset the system, first turn the HK 3470 off by press- ing the Main Power Switch 1 and then releasing it so that it extends out beyond the front panel and the word “OFF” is visible in red at the top of the switch.

Next, press and hold the T-Monand CD Input Selector buttons 9 # on the front panel ONLY. While holding these buttons in, press the Main Power Switch 1 in until it latches, so that the button is flush with the front panel.

The Main Information Display will briefly show the word RESET, and then return to normal operation.

Note that when the system is reset in this fash- ion, 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 your dealer or an authorized Harman Kardon service center.

Troubleshooting Guide

This unit is designed for trouble-free operation. Most problems users encounter are due to operating errors. 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...	Make sure that the...
No lights appear when POWER button is pressed	Unit is plugged into a live outlet.
	Main power switch is pressed in.
No sound is heard	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.
No output from one or more channels	Cables are not defective: check/replace speaker cables.
Tuner sound has a large amount of interference, or	Antenna is properly connected.
the “Stereo” display is not illuminated, or	Antenna is properly located.
Tuner sound distorts and/or volume level is too low	Antenna is set in the proper direction.
	Antenna is adequate to receive the desired station.
Tuner is intermittent or continuously buzzing or hissing	Unit is away from fluorescent lights, TVs, motors and
	other electrical appliances.
Remote does not function correctly	Batteries are not weak, and replace them if necessary.
	Correct device page has been selected by pressing the Source Selector key ç.
	Remote sensor is not obstructed, and remote is pointing directly at sensor at
	an angle of no more than 30 degrees. Also, check for fluorescent lighting, which
	may be interfering with the IR transmission.
	Remote has been reprogrammed correctly. If you are in doubt, reset the remote
	to the factory default programming using the procedure outlined above.
Cassette or CD sounds distorted	Cassette deck or CD player has not been plugged into the Phono input.
	(Only use the outputs of a turntable or tonearm with the Phono input.)

19OPERATION/TROUBLESHOOTING