Frymaster H55 Series Technical Reference Manual page 58

Problem
MIB board alternat-
Network error on the CAN bus
ing "E" and "vat
communication.
number and side."
Automatic Filtering Fryers
Probable Cause
4-14
Corrective Action
A. Ensure the CAN bus system is terminated
at BOTH ENDS (on the controller connec-
tor J6; ATO board connector J10) with a
resistor-equipped 6-pin connector.
B. With the controller OFF, press TEMP but-
ton 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 controller (J6 and
J7), MIB (J1 and J2), AIF (J4 and J5) and
ATO (J10) boards.
C. With the controller OFF, press TEMP but-
ton 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 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 fi rst AIF board. If 24V miss-
ing, check the pins. Replace the 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 continu-
ity 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 posi-
tion (see pages 1-54 — 1-58).
G. Ensure all boards have the corner ground
wire attached and tightened.
H. Check for loose locator pin or incorrect
positioning in J2 of the AIF board. See
the charts on pages 1-54 — 1-58 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.