OperationSpecifications
When the installation is complete and all connections have been made to theABH 4 Dimensions (D x W x H):
ABH 4 and receiver, processor or preamplifier, and the A-BUS modules have83mm x 184mm x 30mm
been properly installed in the remote rooms, operation of the ABH 4 is simple.
Weight: 0.9 lb (410g)
There are no user controls on the ABH 4.
Power Supply Dimensions (D x W x H):
After checking the connections, plug the AC power cord from the ABH 4Os Power
70mm x 151mm x 36mm
Supply into a non-switched AC outlet and turn on the host receiver, processor or
Weight: 1 lb (450g)
preamplifier. Operation of the ABH 4 is seamless, as the remote A-BUS modules
will communicate directly with the host source.Power Supply Input: 108 � 264 VAC, 115 watts
When the ABH 4 is used with an A-BUS/READY receiver, the A-BUS modules inPower Supply Output: 24-volt, 4-amp supply included
the remote room operate as if they were connected directly to the host receiver.
Status Power: 12 volts, 200ma
No further controls are needed. Follow the instructions included with the A-BUS
Wiring protocol for A-BUS connections: TIA wiring specification for TIA 568A
modules for operation information.
When the ABH 4 is used in the stand-alone mode with a source that is not
A-BUS/READY, the method of operation varies depending on the specifics of the
installation:
Y When a 12-volt adaptor is not connected to the ABH 4Os Status Input �,
the system is able to pass through IR commands from the remote modules
to turn on the host receiver, processor or preamplifier, but there is no power
to a remote moduleOs internal amplifier until an audio signal is sensed at the
ABH 4Os Audio Inputs L.
Y When a 12-volt adaptor is connected to the ABH 4Os Status Input �, theTop-Edge Connections
system is ready for full operation at all times, including pass-through of IR� Status Input
commands from remote A-BUS modules as well as power to the remote
a Power Input
modulesO internal amplifiers.
L Audio Inputs
The three LED indicators on the ABH 4 signify the following operational modes:
c Expansion In Jack
Y The Status Indicator � lights when the system is activated either by con-
° Expansion Out Jack
nection to an A-BUS/READY receiver that is turned on, when a signal is sensed
at the Audio Inputs L or when a 12-volt power source is connected to the
Status Inputs �. This light indicates that the remote modules are active and
ready to accept and transmit commands.
Y The Power Indicator o lights when the AC Power Supply is connected to
the ABH 4 and/or when a connection is made between the ABH 4 and an
A-BUS/READY receiver. This light indicates that the system is powered on and
is operational.
Y The IR Indicator Ť flashes whenever an IR command is transmitted through
the system.
Bottom-Edge Connections
Troubleshooting Guide
¤ Local IR Input Terminals
If the remote A-BUS modules do not operate at all:
? IR Emitter Jacks
Y Verify all connections between the remote modules and the ABH 4
Y A-BUS Outputs
Y Check the RJ-45 connection between the ABH 4 and the host receiver
(A-BUS/READY systems)
Y Check the AC power connection at both the ABH 4Os Power jack and on
the Power Supply
If the remote moduleOs status LED is lit but there is no sound:
Y Make certain that an active source has been selected on the host receiver
Y Check the RJ-45 connection between the ABH 4 and the host receiver
(A-BUS/READY systems)
Y Check the audio connections between the ABH 4 and the host receiver
LED Indicators
(non-A-BUS/READY systems)
� Status Indicator
For additional troubleshooting information and updated operational and installa-
o Power Indicator
tion hints, please visit the Product Support section of the Harman Kardon Web
site at www.harmankardon.com.Ť IR Indicator
7
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HARMAN KARDON
