Using the ps bus, Trouble shooting guide – PS Audio HCA-2 User Manual
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Using the PS Bus
The PS Bus allows for more sophisticated
communication between other PS Audio
products. The HCA-2 includes two PS Bus
connectors. This allows for several PS products
to be linked together so they work as a system.
There are 4 small switches next to the PS Bus
connectors. If the PS Bus is not in use, then the
switch setting will not effect the operation of the
amplifier.
From left to right the first three switches set the
“Network Address” for the product on the PS
Bus. If more than one HCA-2 is connected to
the bus, then each amplifier should be assigned
a different address. The switches are off when
up, and on when down.
Address
SW1
SW2
SW3
1
Off
Off
Off
2
On
Off
Off
3
Off
On
Off
4
On
On
Off
5
Off
Off
On
6
On
Off
On
7
Off
On
On
8
On
On
On
The fourth switch, SW4, is used to assign the
amplifier to a “Network Group”. Either group
1 or group 2 can be selected (up or down
respectively). Multiple groups can be used if
it is necessary to connect multiple products to
the PS Bus but only specific products should
respond to commands.
Trouble Shooting Guide
The HCA-2 is stuck in “fault” mode
Ensure that the speaker wires are not shorted
out (making contact with each other). if the
HCA-2 is connected to a powerd subwoofer,
ensure the subwoofer’s negative input terminal
is not grounded.
Disconnect unit from its power source and
plug it back in to clear fault mode. If the unit
remains in fault mode this then it may need to
be serviced. Contact PS Audio or an authorized
distributor.
One or both channels are not working or
sound “muted”, “distorted” or “quiet”
Unplug the HCA-2 and remove the top cover.
Now examine the 2 fuses on main circuit board
located where output wires attach to board. The
fuses are half size (5x20mm) and the value is 5
amp fast blow. Replacing the fuse should bring
the unit back to life. If it does not then it may
need to be serviced. Contact PS Audio or an
authorized distributor.
Note: The fuses blow due to either very loud
playback or very low impedance speakers or a
combination of both. If this happens frequently,
reduce the playback volume or use speakers
with higher impedance.
The speakers are producing a hum or buzz
A hum or buzz heard through speakers is a
ground loop hum. A ground loop hum can occur
if there are two different ground lines attached
to the system. Use the Humbusters guide on the
PS Audio website
under “Toolbox” to help pinpoint the problem.
A very low level fuzz/crackling noise audible
within 1-2 feet from the speaker is the HCA-2’s
own “self” noise and is normal.
The HCA-2 is producing an audible signal or
“singing” internally
If the HCA-2 is producing noise then one or both
of the speakers are not connected while the
HCA-2 is powered on and producing a signal.
Turn off the HCA-2 and connect both speakers
and turn the unit back on.
The HCA-2 is not responding and is
completely dark
The main fuse may need to be replaced. Using
a flat head screwdriver or small coin, twist it
counter-clockwise. The fuse holder should pop
out. Replace the fuse with the included 7 amp
slow blow or a fuse with the identical rating.
If the problem persists then it may need to be
serviced. Contact PS Audio or an authorized
distributor.
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