AVR 355 (serv.man7) - Harman Kardon Audio Service Manual (repair manual). Page 4

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 OK button 6 for five seconds.

The unit will turn on automatically and show the
word RESET in the Display for a few seconds.
Then it reverts to normal ON status. 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.

Unit does not function when Main

• No AC Power

• Make certain AC power cord is plugged 

Power Switch 1 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 

G

• Volume control is down

• Turn up volume control

No sound from any speaker; 

• Amplifier is in protection mode

• Check speaker-wire connections for shorts at receiver 

Protect Warning in Display

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 Ó 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

No picture or on-screen

• AVR Resolution to Display

• Select correct Resolution as described

information on the TV screen.

is not correct, too high or too low.

on page 21 "Resolution To Display"

harman/kardon

AVR 355/230 Service Manual

Page 4 of 125