Service manual

Quest Installation and Service Manual
720506904 - 15 - Revision B
Machine contin-
ues to dispense
after dispense but-
ton is released or
dispenses without
operator input
• Push button or portion control
pad stuck in on position
• Disconnect the wire harness from
the rear of the portion control and
close the door. If unit does not
dispense on its own the dispense
control board is bad (stuck on)
• Relay on voltage regulator board
(VRB) stuck on.
• Disconnect the 4-wire harness
from the lower right corner of the
VRB. If the unit continues to dis-
pense on its own the VRB is
defective (relay stuck on)
PROBLEM PROBABLE CAUSE REMEDY