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            Service Manual 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 
 

 
ESD 

  ELECTRICAL 

  SEMICONDUCTOR 

 

   

 
 
 
 
 
 
 
Released 

EU2008 

   harman/kardon, 

Inc. 

  Rev 

0, 

05/2008 

 

 

 

 

 

       250 Crossways Park Dr. 

      

 

 

Woodbury, 

New 

York, 

11797 

harman/kardon

AVR247/230 Service Manual

Page 1 of 131

Each precaution in this manual should be followed during servicing.

Components identified with the IEC symbol

in the parts list are special significance to safety. When replacing a component identified with

, use only the replacement parts designated, or parts with the same ratings or resistance, wattage, or voltage that are designated in the

parts list in this manual. Leakage-current or resistance measurements must be made to determine that exposed parts are acceptably

insulated from the supply circuit before retuming the product to the customer.

Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called

Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field effect transistors and

semiconductor "chip" components.

The following techniques should be used to help reduce the incidence of component damage caused by static electricity.

1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any electrostatic charge on

your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device,

which should be removed for potential shock reasons prior to applying power to the unit under test.

2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as aluminum foil, to

prevent electrostatic charge build-up or exposure of the assembly.

3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.

4. Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static" can generate electrical charges

sufficient to damage ES devices.

5. Do not use freon-propelled chemicals. These can generate electrical change sufficient to damage ES devices.

6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most replacement

ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or comparable conductive material.)

7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the

chassis or circuit assembly into which the device will be installed.

Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.

8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise harmless motion such as the brushing together

or your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity sufficient to damage an ES devices.

CAUTION :

harman/kardon

AVR247/230 Service Manual

Page 2 of 131

TECHNICAL SPECIFICATIONS 57

Audio Section
Stereo Mode 
Continuous Average Power (FTC)

65 Watts per channel, 20Hz–20kHz,
@ < 0.07% THD, both channels driven into 8 ohms

7 Channel Surround Modes 
Power Per Individual Channel

Front L&R channels:
50 Watts per channel,
@ < 0.07% THD, 20Hz–20kHz into 8 ohms

Center channel:
50 Watts, @ < 0.07% THD, 20Hz–20kHz into 8 ohms

Surround (L & R Side, Back) channels:
50 Watts per channel,
@ < 0.07% THD, 20Hz–20kHz into 8 ohms

Input Sensitivity/Impedance 

Linear (High Level)

200mV/47kohms

Signal-to-Noise Ratio (IHF-A)

100dB

Surround System Adjacent Channel Separation 

Analog Decoding 

40dB 

(Pro Logic, etc.) 
Dolby Digital (AC-3) 

55dB 

DTS

55dB

Frequency Response 

@ 1W (+0dB, –3dB)

10Hz–130kHz

High Instantaneous 
Current Capability (HCC)

±35 Amps

Transient Intermodulation 
Distortion (TIM)

Unmeasurable

Rise Time

16 µsec

Slew Rate

40V/µsec**

Frequency Range

87.5–108MHz

Usable Sensitivity

IHF 1.3 µV/13.2dBf

Signal-to-Noise Ratio

Mono/Stereo: 70/68dB (DIN)

Distortion

Mono/Stereo: 0.2/0.3%

Stereo Separation

40dB @ 1kHz

Selectivity

±400kHz: 70dB

Image Rejection

80dB

IF Rejection

90dB

Frequency Range

522–1620kHz

Signal-to-Noise Ratio

45dB

Usable Sensitivity

Loop: 500µV

Distortion

1kHz, 50% Mod: 0.8%

Selectivity

±10kHz: 30dB

Video Format

PAL/NTSC

Input Level/Impedance

1Vp-p/75 ohms

Output Level/Impedance

1Vp-p/75 ohms

Video Frequency Response
(Composite and S-Video)

10Hz–8MHz (-3dB)

Video Frequency 
Response (Component)

10Hz–100MHz (-3dB)

HDMI

™

Audio and video processing

Power Requirement

AC 220–240V/50Hz

Power Consumption

65W idle, 540W maximum 
(7 channels driven) 

Dimensions (Max)

Width

440mm 

Height

165mm 

Depth

382mm 

Weight

13.6 kg

Depth measurement includes knobs, buttons and terminal connections.
Height measurement includes feet and chassis.
All features and specifications are subject to change without notice.

Harman Kardon, The Bridge 

and Logic 7 are registered trademarks of 

Harman International Industries, Incorporated.

is a trademark of Harman International Industries, Inc.

*Manufactured under license from Dolby Laboratories.
“Dolby,” “Pro Logic” and the Double-D symbol are 
trademarks of Dolby Laboratories.

"DTS","DTS ES","Neo:6"and"96/24" are trademarks of DTS,Inc.

SA-CD is a trademark of Sony Electronics, Inc.

Blu-ray Disc is a trademark of the Blu-ray Disc Association.

Apple and iPod are registered trademarks of Apple Computer, Inc.

Cirrus is a registered trademark of Cirrus Logic Corp.

**Without input anti slewing and output isolation networks.

Faroudja and DCDi by Faroudja are trademarks of Genesis Microchip, Inc.
HD-DVD is a trademark of the DVD Format/Logo Licensing Corporation (DVD FLLC).
HDMI, the HDMI logo and High-Definition Multimedia Interface are trademarks or 
registered trademarks of HDMI Licensing, LLC.

This product incorporates copyright protection technology that is protected by method
claims of certain U.S. patents and other intellectual property rights owned by Macrovision
Corporation and other rights owners. Use of this copyright protection technology must be
authorized by Macrovision Corporation, and is intended for home and other limited viewing
uses only unless otherwise authorized by Macrovision Corporation. Reverse engineering or
disassembly is prohibited.

33230_AVR247_Eng  29/06/07  8:48  Side 57

harman/kardon

AVR247/230 Service Manual

Page 3 of 131

56 TROUBLESHOOTING GUIDE

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 three seconds.

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.

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 

• 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 

light around Power switch 2 is 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

• 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

33230_AVR247_Eng  29/06/07  8:48  Side 56

harman/kardon

AVR247/230 Service Manual

Page 4 of 131