QUANTUM™ HD UNITY SYSTEM CONTROLLER
MAINTENANCE
090.670-M (APR 2020)
Page 7
To troubleshoot the low-voltage side of the control cir-
cuits, it is necessary to have the following tools:
• Accurate digital multimeter, capable of reading to DC/
AC, mA to the hundreds place
• Small wire stripper
• Small screwdriver, with insulated shaft
• Small snip nose pliers
• Wrist Grounding strap
• Static free grounded work surface
NOTICE
Proper panel voltage refers to the AC voltage that
has been supplied to the panel, which could be either
nominal 120 VAC or nominal 230 VAC.
What to do before calling the factory
Many times when a suspected controller problem is called
in to the factory, not enough information is provided for
the service personnel to assist in solving the problem. This
is because the caller most likely is not aware of the type of
information that would be useful to factory personnel.
System Controller Drawings
Check the
Product Drawings
tab at
www.frickcontrols.com for the latest drawings.
An example of this is the statement that the Quantum
™
HD Unity is not booting (the main processor board is not
starting). However, this description may only mean that
there is nothing on the display. A blank screen could be
the result of many different problems. The following is a
list of possible reasons for no display:
• No power
• Loose or faulty display cable or inverter cable
• Bad display
• Faulty processor board
Before calling the factory for assistance, review the in-
formation on the following pages and try to discover and
resolve the problem. The actual cause of most problems
is usually not with the Q6 processor board itself, but with
something external. However, on the rare occasion that
the problem has been identified as being the Q6 processor
board, use the information in
Section 2
as a guideline for
replacing it.