7
Specifications
ABH 4 Dimensions (D x W x H):
3-5/16" x 7-3/16" x 1-3/16" (83mm x 184mm x 30mm)
Weight: 0.9 lb (410g)
Power Supply Dimensions (D x W x H):
2-13/16" x 5-15/16" x 1-7/16" (70mm x 151mm x 36mm)
Weight: 1 lb (450g)
Power Supply Input: 108 – 264 VAC, 115 watts
Power Supply Output: 24-volt, 4-amp supply included
Status Power: 12 volts, 200ma
Wiring protocol for A-BUS connections: TIA wiring specification for TIA 568A
Operation
When the installation is complete and all connections have been made to the
ABH 4 and receiver, processor or preamplifier, and the A-BUS modules have
been properly installed in the remote rooms, operation of the ABH 4 is simple.
There are no user controls on the ABH 4.
After checking the connections, plug the AC power cord from the ABH 4’s Power
Supply into a non-switched AC outlet and turn on the host receiver, processor or
preamplifier. Operation of the ABH 4 is seamless, as the remote A-BUS modules
will communicate directly with the host source.
When the ABH 4 is used with an A-BUS/
READY
receiver, the A-BUS modules in
the remote room operate as if they were connected directly to the host receiver.
No further controls are needed. Follow the instructions included with the A-BUS
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:
• When a 12-volt adaptor is not connected to the ABH 4’s
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 module’s internal amplifier until an audio signal is sensed at the
ABH 4’s
Audio Inputs
£
.
• When a 12-volt adaptor is connected to the ABH 4’s
Status Input
¡
, the
system is ready for full operation at all times, including pass-through of IR
commands from remote A-BUS modules as well as power to the remote
modules’ internal amplifiers.
The three LED indicators on the ABH 4 signify the following operational modes:
• The
Status Indicator
å
lights when the system is activated either by con-
nection to an A-BUS/
READY
receiver that is turned on, when a signal is sensed
at the
Audio Inputs
£
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.
• The
Power Indicator
∫
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.
• The
IR Indicator
ç
flashes whenever an IR command is transmitted through
the system.
Troubleshooting Guide
If the remote A-BUS modules do not operate at all:
• Verify all connections between the remote modules and the ABH 4
• Check the RJ-45 connection between the ABH 4 and the host receiver
(A-BUS/
READY
systems)
• Check the AC power connection at both the ABH 4’s Power jack and on
the Power Supply
If the remote module’s status LED is lit but there is no sound:
• Make certain that an active source has been selected on the host receiver
• Check the RJ-45 connection between the ABH 4 and the host receiver
(A-BUS/
READY
systems)
• Check the audio connections between the ABH 4 and the host receiver
(non-A-BUS/
READY
systems)
For additional troubleshooting information and updated operational and installa-
tion hints, please visit the Product Support section of the Harman Kardon Web
site at www.harmankardon.com.
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Top-Edge Connections
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Status Input
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Power Input
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Audio Inputs
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Expansion In Jack
∞
Expansion Out Jack
Bottom-Edge Connections
§
Local IR Input Terminals
¶
IR Emitter Jacks
•
A-BUS Outputs
LED Indicators
å
Status Indicator
∫
Power Indicator
ç
IR Indicator
