DOWNLOAD Harman Kardon AVR 645 Service Manual ↓ Size: 18.07 MB | Pages: 117 in PDF or view online for FREE

TROUBLESHOOTING GUIDE

SYMPTOM

CAUSE

SOLUTION

Unit does not function when Main

• No AC Power

• Make certain that AC power cord firmly connected to the AC Power Cord

Power Switch is pushed

Socket

I and is plugged into a live outlet

• Check to see whether outlet is switch-controlled

Display lights, but there is no sound

• Intermittent input connections

• Make certain that all input and speaker connections 

or picture

are secure

• Mute is on

• Press Mute Button

ß

• Volume control is down

• Turn up volume control

Unit turns on, but front-panel 

• Display brightness is turned off

• Follow the instructions in the Display Brightness section 

display does not light up

on page 44 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 and 

light around power switch is red

due to possible short

speaker ends 

• Amplifier is in protection mode 

• Contact your local Harman Kardon service center

due to internal problems

No sound from surround or

• Incorrect surround mode

• Select a mode other than Stereo

center speakers

• Input is monaural

• There is no surround information from mono sources

• Incorrect configuration 

• Check speaker mode configuration                                       

• Stereo or Mono program material

• The surround decoder may not create center- or 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

• Remote sensor 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 Input is selected

Fan does not appear to operate

• Additional cooling may not be required

• The fan is activated only when additional cooling is required due to

high internal temperature, it is normal for the fan to be inactive at 
normal volume levels

In addition to the items shown above, additional information on troubleshooting possible problems with your AVR 645, or installation-related issues, may be found in the list of
“Frequently Asked Questions” which is located in the Product Support section of our Web site at www.harmankardon.com.

Processor Reset

In the rare case where the unit’s operation or the dis-
plays 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 3 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 645’s entire system memory includ-
ing tuner presets, output level settings, delay times and
speaker configuration data, first put the unit in the

Standby Mode by pressing the Standby/On Switch
1. Next, press and hold the Surround Mode Group
Selector

2 and the Tuning Mode Selector 8

buttons for 3 seconds.

The unit will turn on automatically and display the
RESET message in the Upper Display Line 

#.

NOTE: Resetting the processor will erase any configu-
ration settings you have made for speakers, output
levels, surround modes, and 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 center.

TROUBLESHOOTING  59

HKP1445AVR645om  6/7/06  6:36 PM  Page 59

harman/kardon

Page 5 of 117

PACKING PARTS LIST FOLLOWING PAGE

harman/kardon

Page 6 of 117

Item # Part Number

Description

1

LABEL BARCODE AVR TF PRINT

2

ZKD2904HA01-R

BOX CARTON AVR645US

US

ZKD3004HA00-R

BOX CARTON AVR645 EU 

EU

3

ZKD2901HA00-R

OWNER'S MANUAL AVR645US  

US

ZKD3001HA00-R

OWNER'S MANUAL AVR645 EU 

EU

4

ZQD1201HAWH-R

CUSHION POLY EPS RIGHT AVR

5

FILM SHEET PE  920 X 1000  

6

H03-WAD022000BK-R

POWER CORD WR002 H05VV-F 0.75MMSQ 2G BLACK 

7

ZQD1202HAWH-R

CUSHION POLY EPS LEFT AVR

8

AVR TOTAL ACCESSORY BOX

9

REMOCON W/ ACCESSORY  BOX  AVR 

10

BAG PE 330 X245 T0.05 

11

ZKD2916HB00-R

QUICK SETUP GUIDE AVR645US

12

LABEL SAFETY LEAFLET 

13

ZKC1113HA00-R

CARD WARRANTY 

14

ZKD1263HA00-R

BROCHURE AVR US

15

ZKC1263HA00-R

INSERT RS232 NOTE PAPER  

16

H03-ZPD1212INBK-R

MICROPHONE ASSY EXTENSION PIECE 

17

INSERT RS232 NOTE PAPER 

18

BAG PE 160X180MM   

19

H03-WAB01200203-R

FM ANTENNA WIRE 75 T15011N-1

US

H03-WAD01200303-R

ANTENNA WIRE 75 OHM WIRE T15011F-1

EU

20

H03-ATALF039ABK-R

AM ANTENNA WIRE ANTENNA LOOP-300 

21

POLYBAG BATTERY

22

BATTERY ALKALINE 1.5V AAA 

23

BOX, ZONE II REMOTE CONTROL

24

H03-RYD2702HA00-R

REMOCON ZONE II AVR                                                         US

H03-RYD2702HA01-R

REMOCON ZONE II AVREU

EU

25

BOX MIC

26

H03-MCD12TWBKNN-R

AVR635 MICROPHONE ASSY                                                

harman/kardon

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EXPLODED VIEW PARTS LIST FOLLOWING PAGE

harman/kardon

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