AVR 70 - Harman Kardon Audio Service Manual (repair manual). Page 6

AVR 700/AVR 70/AVR 70C

4

Front-Panel Controls

Main Power switch: this mechanical switch turns the AVr’s power supply on or off. It is 

usually left on and cannot be turned on or off using the remote control.
Standby indicator: this led glows amber to indicate that the AVr is in the Standby 

mode.
Power On/Standby button: press this button to turn the AVr on and put it into the 

Standby mode. when the AVr is on the power on indicator glows blue and the Standby 

indicator turns off.
Stereo Mode button: places the AVr in the stereo listening mode.
IR Sensor: this sensor receives infrared (Ir) commands from the remote control. It is 

important to ensure that the sensor is not blocked.
Surround Mode Select buttons: press these buttons to select a surround listening 

mode. Surround-mode availability depends on the nature of the source input signal, i.e., 

digital versus analog, and the number of channels encoded within the signal.
Tuning Up/Down buttons: use these buttons to tune radio stations according to the 

setting of the Am/fm button (see below).
AM/FM button: press this button to listen to the radio. pressing this button when the 

radio is in use will select among the fm Stereo, fm mono and Am bands. See Listening 

to FM and AM Radio, on page 16, for more information.
Message display: Various messages appear in this display in response to commands 

and changes in the incoming signal. In normal operation, the current source device name, 

surround mode and active input appear. when the on-screen display menu system (oSd) 

is in use, the current menu settings appear.

IMPORTANT NOTE: If the protect message ever appears on the message display, 

turn off the AVr and unplug it from the Ac outlet. check all speaker wires for a 

possible short circuit (the “+” and “–” conductors touching each other or both 

touching the same piece of metal). If a short circuit is not found, bring the unit to 

an authorized harman kardon service center for inspection and repair before using 

it again.

Preset Selector buttons: when the radio is in use, press these buttons to cycle through 

your preset radio stations.(See Listening to FM and AM Radio, on page 16, for more 

information.) note: when you're listening to files on a uSb device, the tuning up/down 

buttons and the preset Selector buttons serve as the uSb device’s transport control 

buttons.(See Playing Files on a USB Device, on page 16, for more information.)
Source Select buttons: press these buttons to select the active source device.
Memory/Folder button: when the radio is in use, press this button to set the current 

station as a preset. See Listening to FM and AM Radio, on page 16, for more information. 

when a uSb device is the active source deivce, press this button to display the contents 

of the current folder or to display all of the folders in the current directory level. See 

Playing files on a USB Device, on page 16, for more information.
Headphone connector: connect a 1/4" stereo headphone plug to this jack for private 

listening
USB Port: Insert a flash drive or hdd disk drive with a uSb Standard-A cable to this port.
Volume control: turn this knob to raise or lower the volume.
Video 3 Audio and Video Input connectors: connect an auxiliary audio/video source 

component that will be used only temporarily, such as a camcorder, portable music 

player or game console, here.

Standby 

Indicator

message 

display

Volume 

control

power on Indicator 

(inside Volume control ring)

memory/folder 

button

Surround mode 

Select buttons

Ir 

Sensor

main power 

Switch

on/Standby 

Switch

headphone  

connector 

Source Select 

buttons

tuning up/down 

button

Stereo mode 

button

preset Selector 

buttons

Am/fm 

button

uSb 

port

Video 3 

Audio and Video 

Input connectors