PS Audio Using the PS Bus, Trouble Shooting Guide, The HCA-2is stuck in “fault” mode

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 <www.psaudio.com> located 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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