Frymaster FilterQuick FQG30 Service Manual page 37

Problem
MIB board alternating
"E" and "vat number
and side".
Probable Causes
Network error on the CAN bus
communication.
Corrective Action
A. Ensure the CAN bus system is terminated at
BOTH ENDS
controller connector J6 and on the ATO
board connector J10) with a resistor
equipped 6-pin connector.
B. With the
temperature button and ensure the AIF
version appears. If not, the 24V to the AIF
boards may be missing. Ensure all 6-pin
CAN connectors are tight between the
FilterQuick™ controller (J6 and J7), MIB
(J1 and J2), AIF (J4 and J5) and ATO (J10)
boards.
C. With the
temperature button and ensure the ATO
version appears. If not, check the CAN wire
harness between the AIF board J4 or J5 and
the ATO board J9 or J10. The ATO fuse on
the right side of the ATO box may be loose
or blown; the 110V to the ATO transformer
may be missing or bad. The J4/J5 connector
may be loose.
D. Check to see if MIB has 24V on pins 5 and
6 of J2. Check to see if 24V is present on
pins 5 and 6 of wire harness plugging into
J4 or J5 of the first AIF board. If 24V
missing, check the pins.
harness if necessary.
E. Check continuity between each color wire
on the CAN connectors into J7 on the far
right controller and J10 on back of the ATO
board (black to black, white to white, and
red to red), and ensure there is no continuity
between different color wires (black to red,
red to white, and white to black).
F. Ensure black controller locator wires are
connected from ground to correct pin
position (see drawing 8051978 page 1-65).
G. Ensure all boards have the corner ground
wire attached and tightened.
H. The locator pin in J2 of the AIF board is
either loose or in the incorrect position. See
the charts on page 1-41 of this manual for
proper pin position.
I. Bad MIB and/or AIF board.
J. Broken resistor lead. Unwrap the resistor
leads and check ends.
1-32
(on the FilterQuick™
controller OFF, press
controller OFF, press
Replace the
the
the