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4

BDS

Receiver Front-Panel Controls

Eject Button

On/Standby 

Indicator

Volume Control/ 

Power Button

USB Port

Headphone 

Connector

Information 

Display

Disc Slot

Harman Kardon

BDS X75 + X77 Service Manual

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5

BDS

Receiver Front-Panel Controls

Eject button (appears only when a disc has been inserted): Touch this button to 

eject a disc from the BDs receiver’s built-in disc player. Before touching this button, 

make sure no objects are blocking the disc-slot opening. NOTe: If you do not remove 

the ejected disc within 90 seconds, it will automatically re-load back into the disc 

player for protection.
Disc slot: Insert a compatible disc into the slot. The BDs receiver’s disc player will 

accept 5-inch (12cm) and 3-inch (8cm) discs.
Information display: Various messages appear on this display in response to 

commands and in order to show the audio/video that is playing, the BDs receiver’s 

settings or other aspects of the BDs receiver’s status as described throughout this 

manual.
On/Standby indicator: This LeD surrounds the Volume control. when the BDs 

receiver is plugged into aC power and its rear-panel Main power switch is in the On 

position, the LeD turns amber to indicate that the receiver is in standby mode (ready 

to be turned on). when you turn the BDs receiver on the LeD turns white. 
Headphone jack: Insert the 1/8-inch (3.5mm) stereo mini connector from a set 

of headphones into this jack. NOTe: when a plug is inserted into the Headphone 

jack, the BDs receiver’s speaker outputs automatically mute; the HDMI audio output 

remains active.
USB port: you can use the UsB port to play audio files from an apple iOs

®

 device 

connected to the port, and to play Mp3 and wMa audio files from a UsB device 

inserted into the port. Insert the connector or device into the UsB port oriented so it 

fits all the way into the port. you may insert or remove the connector or device at any 

time - there is no installation or ejection procedure.
you can also use the UsB port to perform firmware upgrades. If an upgrade for the 

BDs operating system is released in the future, you will be able to download it to 

the BDs receiver using this port. Complete instructions will be provided at that time.
IMPORTANT: Do not connect a PC or other USB host/controller to this port, 

 

• press the disc to toggle the receiver between the On and standby modes.  

NOTe: If the receiver goes for 30 minutes without receiving an audio signal or a user 

command, it will automatically enter the standby mode to conserve electrical power.

 

• Rotate the disc to change the volume. The volume level will appear on the front-

panel Information display and the on-screen display.

IMPORTANT: Do not turn the receiver’s Volume control up to or past the point where 

the audio from the speakers becomes distorted. Doing so can damage the speakers.

Harman Kardon

BDS X75 + X77 Service Manual

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6

BDS

Receiver Rear-Panel Connections

Main 

Power Switch

AC Power 

Connector

Component 

Video Input 

Connector

HDMI Input 

Connectors

Network 

Connector

HDMI  

Monitor Out 

Connector

Optical 

Digital Input 

Connectors

Fan 

Vents

Speaker 

Connectors

Remote 

IR Input 

Connector

Subwoofer 

Output 

Connector

FM Antenna 

Connector

Subwoofer 

Trigger 

Connector

Coaxial 

Digital Input 

Connector

Analog 

Audio Input 

Connectors

Harman Kardon

BDS X75 + X77 Service Manual

Page 7 of 106

7

BDS

Receiver Rear-Panel Connections

NOTe: see the Connections section, on page 10, for detailed information about 

making connections.
Main Power switch: This mechanical switch turns the BDs receiver’s power supply 

on or off. after you have made and verified all connections (see the Connections 

section, on page 10), set this switch to the “On” position. During normal use you will 

usually leave this switch set to On; it cannot be turned on or off using the remote 

control. To conserve energy when you’re not going to be using the receiver for an 

extended period of time, set this switch to “Off.”
Fan vents: These vents are used by the receiver’s fan to cool the unit. Maintain a 

clearance of at least three inches (75mm) from the nearest surface to avoid overheating 

the unit. It is normal for the fan to remain off at most normal volume levels. an automatic 

temperature sensor turns the fan on only when it is needed.

IMPORTANT NOTE: Never block the fan vents. Doing so could allow the BDs receiver 

to overheat to dangerous levels.

Speaker connectors: Use the speaker wires supplied with the speakers to connect 

the satellite and center speakers to the proper terminals. 

 

• BDs 575 and BDs 577 receivers (shown) have connections for five speakers: front 

left, front right, surround left, surround right and center.

 

• BDs 275 and BDs 277 receivers (not shown) have connections for two speakers: 

front left and front right.

see Connections, on page 10, for more information.
Subwoofer Trigger connector: This connector provides 12V DC whenever the receiver 

is on. It can be used to turn on and off other devices such as a powered subwoofer.
Remote IR Input connector: when the IR sensor on the front panel is blocked (such as 

when the receiver is installed inside a cabinet), connect an optional IR receiver to the 

Remote IR Input connector.
Coaxial Digital Input connector: Connect the coaxial digital output of an audio-

only source component here. The signal may be a Dolby

®

 Digital bitstream, a DTs

®

 

bitstream or a standard pCM digital-audio bitstream. 
NOTe: Use only one type of digital connection for each source component.
Subwoofer Output connector: Use a mono RCa audio cable to connect this jack 

to a powered subwoofer’s line-level input or Lfe jack. see Connecting a Powered 

Subwoofer, on page 10, for more details about making connections.
Analog Audio Input connectors: Use these connectors to connect to an audio-only 

source devices (such as a tape deck). Do not connect a turntable to these connectors 

without a phono preamp.
FM Antenna connector: Connect the supplied fM antenna to this terminal.
Optical Digital Input connectors: Connect the optical digital output of an audio-

only source component here. The signal may be a Dolby Digital bitstream, a DTs 

bitstream or a standard pCM digital-audio bitstream. 
NOTe: Use only one type of digital connection for each source component.
Network connector: Use a Cat. 5 or Cat. 5e cable (not supplied) to connect the BDs 

receiver’s Network connector to your home network to enjoy streaming content and 

content from DLNa

®

-compatible devices that are joined to the network. see Connect 

to Your Home Network, on page 12, for more information.
HDMI

®

 Monitor Out connector: Connect the BDs receiver’s HDMI output to your 

TV’s HDMI input. since the HDMI cable transmits both video and audio to the TV, 

we recommend that you set the BDs receiver’s HDMI audio output to Off in the 

receiver’s audio menu to take full advantage of your BDs receiver’s superior audio 

performance. If your TV is 3D capable you can watch 3D content in 3D either from 

the BDs receiver’s built-in disc player or from other 3D-capable source devices 

connected to the BDs receiver’s HDMI Input connectors (see below).
The receiver’s HDMI Monitor Out connection also contains an audio Return Channel 

that carries a digital audio signal from your TV or video display back to the receiver. 

It allows you to listen to HDMI devices that are connected directly to your TV (such 

as an Internet connection) without making an additional connection from the device 

to the BDs receiver.

HDMI Input connectors: you can connect up to three additional source devices that 

have HDMI connectors to the BDs receiver. The HDMI connection transmits digital audio 

and video signals between devices, so you do not have to make any additional audio 

connections for devices you connect via an HDMI connector. The BDs receiver will pass 

3D video signals from 3D capable HDMI source devices to the TV via the HDMI Monitor Out 

connector. see Connecting Your HDMI Source Devices, on page 11, for more information.
NOTe: If you have an apple TV, connect its HDMI output to the BDs receiver’s HDMI 3 

input. when HDMI 3 is the selected source you can use the BDs remote to control various 

apple TV functions. see Controlling an Apple TV, on page 15 for more information.
Component Video Input connector: If you have a video source device that has a 

component video connector (and does not have an HDMI connector), use the component 

video connector. you will also need to make an audio connection from the device to one 

of the BDs receiver’s audio input connectors. see Connections, on page 10, for more 

information.
AC Power connector: after you have made and verified all other connections, plug 

the supplied aC power cord into this input and into an unswitched aC outlet.

Harman Kardon

BDS X75 + X77 Service Manual

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