Harman Kardon AVR 125 Service Manual Download Page 6

6

FRONT-PANEL CONTROLS

FRONT-PANEL CONTROLS

In Manual tuning mode, tap the button lightly and note
that the tuner will step up one frequency increment per
button press. When the button is held for a few sec-
onds you will note that the unit will quickly advance
through the frequency band. Release it and the tuner
will stop. In Auto tuning mode, each press of the but-
ton will search for the next station with an acceptable
signal. Press and hold the button to skip through the
acceptable stations. When the button is released, the
tuner will not stop until it reaches a station with an
acceptable frequency.

To switch back and forth between the Auto and
Manual tuning modes, press the 

Tuning Mode

Selector 

@

.

9

AM/FM Selector:

Pressing this button will auto-

matically switch the AVR 125 to the Tuner mode.
Pressing it again will switch between the AM and FM
frequency bands. (See page 25 for more information
on the tuner.)

)

Preset Stations Selector:

Press this button to

scroll up or down through the list of stations that have
been entered into the preset memory. (See page 25
for more information on tuner presets.)

!

Input Source Selector:

Press this button to

change the input by scrolling up or down through the
list of 

Input Indicators

.

@

Tuning Mode Selector:

Press this button to select

Auto or Manual tuning. When the button is pressed so
that the 

AUTO Indicator

R

lights, the tuner will search

for the next station with an acceptable signal when the

Tuning Selector

8u

is pressed. When the button

is pressed so that the 

AUTO Indicator

R

is not lit,

each press of the 

Tuning Selector

8u

will

increase the frequency. This button may also be used to
switch between Stereo and Mono modes for FM radio
reception. When weak reception is encountered, press
the button until the 

STEREO Indicator

P

goes out to

switch to Mono reception. Press and hold again to
switch back to STEREO mode. (See page 25 for more
information on using the tuner.)

#

Digital Optical 3 Input:

Connect the optical digital

audio output of an audio or video product to this jack.
When the input is not in use, be certain to keep the
plastic cap installed to avoid dust contamination that
might degrade future performance.

$

Digital Coax 3 Input:

This jack is used for con-

nection to the output of portable audio devices, video
game consoles or other products that have a coax
digital audio jack.

%

Video 3 Video Input Jacks:

These jacks may be

used for temporary connection to the composite or S-
Video output of video games, camcorders or other
portable video products.

^

Video 3 Audio Input Jacks:

These audio jacks

may be used for temporary connection to video
games or portable audio/video products such as cam-
corders and portable audio players.

&

Bass Control:

Turn this control to modify the low-

frequency output of the left/right channels by as much as
±10dB, when the unit is in the “Surround Off” mode. Set
this control to a suitable position for your taste or room
acoustics.

*

Balance Control:

Turn this control to change the

relative volume for the front left/right channels.

NOTE:

For proper operation of the surround modes

this control should be at the midpoint or “12 o’clock”
position.

(

Treble Control:

Turn this control to modify the high

frequency output of the left/right channels by as much as
±10dB, when the unit is in the “Surround Off” mode. Set
this control to a suitable position for your taste or room
acoustics.

Ó

Volume Control:

Turn this knob clockwise to

increase the volume, counterclockwise to decrease the
volume. If the AVR 125 is muted, adjusting the

Volume Control

Ó

will automatically release

the unit from the silenced condition.

Ô

Set Button:

When making choices during the

setup and configuration process, press this button 
to enter the desired setting as shown in the 

Main

Information Display 

Û

into the AVR 125’s memory.

The set button may also be used to change the display
brightness. (See page 26.)

Input Indicators:

A green LED will light in front of

the input that is currently being used as the source for
the AVR 125.

Ò

Delay:

Press this button to begin the sequence

of steps required to enter delay time settings. (See
page 19 for more information on delay times.)

Ú

Digital Input Selector:

When playing a source

that has a digital output, press this button to select
between the 

Optical

#

c

and 

Coaxial

$

·

Digital

inputs or to select the source’s analog input.

(See pages 23–25 for more information on digital
audio.)

Û

Main Information Display:

This display delivers

messages and status indications to help you operate

the receiver. (See pages 7–8 for a complete explana-
tion of the Information Display.)

Ù

Channel Select Button:

Press this button to

begin the process of trimming the channel output lev-
els using an external audio source. (For more informa-
tion on output level trim adjustment, see page 25.)

ı

Speaker Select Button:

Press this button to

begin the process of configuring the unit to match the
type of speakers used in your listening room. (See
pages 16–19 for more information on speaker setup
and configuration.)

ˆ

Test Tone Selector:

Press this button to begin

the process of adjusting the channel output levels
using the internal test tone as a reference. (For more
information on output level adjustment, see page 18.)

˜

Surround Mode Indicators:

A green LED will

light in front of the surround mode that is currently 
in use.

¯

Remote Sensor Window:

The sensor behind

this window receives infrared signals from the remote
control. Aim the remote at this area and do not block
or cover it.

33

6

AVR125

 

 

 

 

 

 

            

 

 

 

harman/kardon 

Summary of Contents for AVR 125

Page 1: ...REMOTE CONTROL FUNCTIONS 11 INSTALLATION AND CONNECTIONS 14 TROUBLESHOOTING GUIDE 16 MICROPROCESSOR RESET 16 UNIT EXPLODED VIEW 17 DISASSEMBLY PROCEDURE 18 AMPLIFIER BIAS ADJUSTMENT 21 BLOCK DIAGRAM 22 IC PINOUTS 23 TRANSISTOR PINOUTS 52 ELECTRICAL PARTS LIST 53 PCB DRAWINGS 62 SCHEMATICS 70 WIRING DIAGRAM 82 PACKAGING 83 harman kardon Inc 250 Crossways Park Dr Woodbury New York 11797 Rev5 2 2005 ...

Page 2: ...ior 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 cl...

Page 3: ...al overlays control shaft etc Plug the AC line cord of the appliance directly into a 120V AC 60Hz outlet and turn the AC power switch on Any current measured must not exceed o 5mA ANY MEASUREMENTS NOT WITHIN THE LIMITS OUTLINED ABOVE ARE INDICATIVE OF A POTENTIAL SHOCK HAZARD AND MUST BE CORRECTED BEFORE RETURNING THE APPLIANCE TO THE CUSTOMER Device under test Test all exposed metal surfaces Also...

Page 4: ...Hz 50 Mod 0 8 Selectivity 10kHz 30dB Video Section Television Format NTSC Input Level Impedance 1Vp p 75 ohms Output Level Impedance 1Vp p 75 ohms Video Frequency Response 10Hz 8MHz 3dB General Power Requirement AC 125V 60Hz Power Consumption 68W idle 540W maximum 2 channels driven Dimensions Width 17 3 inches 440mm Height 6 6 inches 168mm Depth 15 4 inches 390mm Weight 23 8 lb 10 8kg Depth measur...

Page 5: ...n Display Û 6 Tone Mode Pressing this button enables or dis ables the Bass and Treble tone controls When the button is pressed so that the words TONE IN appear in the Main Information Display Û the settings of the Bass and Treble controls may be used to adjust the output signals When the button is pressed once or twice so that the words TONE OUT appear in the Main Information Display Û the output ...

Page 6: ...products such as cam corders and portable audio players Bass Control Turn this control to modify the low frequency output of the left right channels by as much as 10dB when the unit is in the Surround Off mode Set this control to a suitable position for your taste or room acoustics Balance Control Turn this control to change the relative volume for the front left right channels NOTE For proper ope...

Page 7: ...des include Hall 1 Hall 2 Theater and 5 Channel Stereo H VMAx Mode Indicators This indicator lights when the VMAx mode is in use VMAx F appears when the Far Field VMAx mode is selected VMAx N appears when the Near Field VMAx mode is selected See page 22 for a description of the VMAx modes I Logic 7 Mode Indicators These indicators light when the Logic 7 mode is in use LOGIC 7C ap pears for the Cin...

Page 8: ...d with sufficient signal strength to pro vide acceptable listening quality R Auto Indicator This indicator lights when the tuner s Auto mode is in use S Analog Input Indicator This indicator lights when an analog input source has been selected T Coaxial Digital Input Indicators These indicators light to show when a Coaxial Digital Input has been selected U Optical Digital Input Indicators These in...

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