A common complaint on older (System 500/600) SC series machines is when the Data Terminal displays “PWR FAULT.” The Power Fault Error indicates that the 5 volt DC line supplied by the internal Power Supply Board had dropped down below a 4.5 DC volt minimum momentarily.
In general, if the change machine is never turned off, the power supply board can start to degrade within a few years. The typical life span of this Power Supply Board is 5 to 7 years from installation.
There are other factors that can cause a Power Fault Error messages, and these may occur even when the power board is not at fault.
One such instance, is the DC motors that are used in the System 500 or 600 Bill Acceptor and Bill Stacker can degrade to a point that when they are running, they can “load” down the power supply temporarily, causing the PWR FAULT error.
Likewise, old, worn out cables can create power losses due to contaminated or loose connections.
Another example is electronic components in the Bill Acceptor, Stacker, or Data Terminal can also degrade and “load” down the supply and cause this error.
There are conditions outside the change machine cabinet that can cause this as well. Poor quality power due to an overloaded circuit or other faulty equipment plugged into the same power circuit can lead to Power Fault errors – because the other equipment is “stealing” electrical supply from the change machine. The Standard System 600 installation instructions recommend connecting the change machine to its own 15 amp circuit.
As always, if you have any service related questions on any Standard Change-Makers products, please contact our Service Department by calling 1-800-968-6955 or email: firstname.lastname@example.org
Kris Kious, National Service Mgr., Standard Change-Makers
As you can see, there are a lot of factors to be aware of when dealing with this issue. If this is a new problem for an older machine, replacing the Power Supply Board is usually the first troubleshooting thing to cross off your list.