Harman-Kardon AVR 155 Troubleshooting Guide, Processor Reset, Power Switch 2 is pushed

Troubleshooting Guide

SYMPTOM	CAUSE	SOLUTION
Unit does not function when Main	• No AC Power	• Make certain AC power cord is plugged
Power Switch 2 is pushed		into a live outlet
		• Check to see if outlet is switch controlled
Display lights, but no sound	• Intermittent input connections	• Make certain that all input and speaker
or picture		connections are secure
	• Mute is on	• Press Mute button
	• Volume control is down	• Turn up volume control

The Main Information Display shows the word "PROTECT", and there is no sound.

• Amplifier is in protection mode	• Check speaker-wire connections for shorts at receiver
due to possible short	and speaker ends
• Amplifier is in protection mode	• Contact your local Harman Kardon service depot
due to internal problems

No sound from surround or	• Incorrect surround mode	• Select a mode other than Stereo
center speakers	• Input is mono	• There is no surround information from mono sources (except with
		Theater and Hall surround modes)
	• Incorrect configuration	• Check speaker mode configuration
	• Stereo or Mono program material	• Some surround modes may not create rear-channel information
		from nonencoded programs
Unit does not respond to	• Weak batteries in remote	• Change remote batteries
remote commands	• Wrong device selected	• Press the AVR Selector 5
	• Remote sensor Ú is obscured	• Make certain front-panel sensor is visible to remote or
		connect remote sensor
Intermittent buzzing in tuner	• Local interference	• Move unit or antenna away from computers, fluorescent lights,
		motors or other electrical appliances
Letters flash in the Channel Indicator	• Digital audio feed paused	• Resume play for DVD
Display $ and Digital Audio stops		• Check that Digital Signal is fed to the Digital Input selected

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.

To clear the AVR’s entire system memory including tuner presets, output level settings, delay times and speaker configuration data, first put the unit in Standby by pressing the System Power Control button 2. Next press and hold the Tone Mode button 8 for five seconds, then release the button.

The unit will turn on automatically. Note that once you have cleared the memory in this manner, it is necessary to re-establish all system configuration settings and tuner presets.

NOTE: Resetting the processor will erase any configuration settings you have made for speakers, output levels, surround modes, digital input assignments as well as the tuner presets. After a reset the unit will be returned to the factory presets, and all settings for these items 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 depot.

48TROUBLESHOOTING GUIDE