Harman-Kardon AVR1550 Troubleshooting Guide, Processor Reset, Main Power Switch 1is pushed

Troubleshooting Guide

SYMPTOM	CAUSE	SOLUTION
Unit does not function when	• No AC Power	• Make certain AC power cord is plugged
Main Power Switch 1is 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 2
	• Volume control is down	• Turn up volume control
Sound is heard, but Front-Panel	• Display brightness is turned off	• Follow the instructions in the Display Brightness section
Display does not light		on page 23 so that the display is set to VFD FULL
No sound from any speaker;	• Amplifier is in protection mode	• Check speaker-wire connections for shorts at receiver
light around Power switch 2is red	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	• Incorrect configuration	• Check speaker mode
	• Stereo or Mono program material	• With (analog or digital) Dolby surround modes, the surround
		decoder may not create rear-channel
		information from non-encoded programs
	• Speakers not properly connected	• Check speaker-wire connections or use test tone
		to verify connections (see page 18)
Unit does not respond to	• Weak batteries in remote	• Change remote batteries
remote commands	• Wrong device selected	• Press the AVR selector 5
	• Remote sensor 5is 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 Pand 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 min- utes. 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 1550’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 the Tone Mode 6and the RDS @buttons simul- taneously.

The unit will turn on automatically and display the RESET message in the Main Information Display M. Note that once you have cleared the memory in this manner, it is nec- essary to re-establish all system configuration settings and tuner presets.

NOTE: Resetting the processor will erase any configuration settings you have made for speak- ers, 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.

TROUBLESHOOTING GUIDE 27