SECTION II
TESTING AND TROUBLESHOOTING
Table 2-1. Troubleshooting Guide
Page 2-7Printed in U.S.A.
Problem Symptom Probable Cause Check Correction
Table operates when
power cord is plugged in,
but will not operate when
power cord is unplugged.
When ENABLE button on
hand control is pressed, its
display does not illuminate
(with power cord
unplugged).
40 amp fuse on charging /
power driver board is blown.
See Figure 5-1 for this
check. Check fuse
visually or perform
continuity check on fuse
(may need to check
secondary thermal fuse
of motor pump. If blown,
thermal fuse will cause
40 amp fuse to blow).
Replace 40 amp fuse. See
Figure 5-1 for fuse location.
10 amp fuse on main
controller board is blown.
Perform continuity check
on 10 amp fuse.
Replace 10 amp fuse. See
Figure 5-1 for fuse location.
Batteries are dead and are
not supplying charging /
power driver board with
enough power to operate.
See Figure 5-1 for this
check. Check individual
batteries by checking for
13.2 +/- 0.4 VDC across
terminals of each battery
(Test Points M and N).
If 13.2 +/- 0.4 VDC is not
present across Test Points,
replace batteries. Refer to
para 4.39.
Charging / power driver
board is malfunctioning.
See Figure 5-1 for this
check. Check for 27.7
+/- 0.3 VDC across Test
Points F and G.
If proper voltage is not
present at Test Points,
replace charging / power
driver board. Refer to
para 4.32.
Batteries do not recharge
in 6 to 8 hours from low
charge.
Batteries do not recharge
very quickly.
One of thermal fuses in
transformer is blown.
See Figure 5-1 for this
check. Check for 32.5
+/- 2.0 VAC across Test
Points C and D, and
across Test Points D
and E.
If 32.5 +/- 2.0 VAC is not
present across one or both of
the Test Point groups, replace
the transformer. Refer to
para 4.36.
Batteries are dead. See Figure 5-1 for this
check. Check individual
batteries by checking for
13.2 +/- 0.4 VDC across
terminals of each battery
(Test Points M and N).
If 13.2 +/- 0.4 VDC is not
present across Test Points,
replace batteries. Refer to
para 4.39.
Hand control does not
work.
When ENABLE button on
hand control is pressed, its
display does not illuminate.
10 amp fuse on main
controller board is blown.
Perform continuity check
on 10 amp fuse.
Replace 10 amp fuse. See
Figure 5-1 for fuse location.
Main controller board or
hand control board is
malfunctioning.
See Figure 5-1 for this
check. Check for 5.0
VDC across Test Points
P and Q. If 5 VDC is
present, check for 5.0
VDC across Test Points
Q and R within 10
seconds of pressing
ENABLE button on hand
control.
If 5.0 VDC is not present
across Test Points P and Q,
the main controller board is
malfunctioning. If 5.0 VDC is
not present across Test Points
Q and R during check, then
main controller board or hand
control board is
malfunctioning. Refer to para
4.31 or 4.5.
Wires or wire connections
between main controller
board, distribution board,
and hand control port are
broken, loose or dirty.
See Figure 5-1 for this
check. Perform a
continuity check on all
suspect wires or
connections.
Clean any dirty connections.
Tighten any loose
connections. Replace any
broken connectors or wires.
Motor pump secondary
thermostat is closed creating
a direct short to ground,
causing 40 amp fuse on
charging / power driver
board to blow.
See Figure 5-1 for this
check. Check for a
resistance value of 0
ohms between Test
Points S and T for motor
# 1 or Test Points U and
V for motor # 2.
Replace malfunctioning motor,
secondary thermostat, and 40
amp fuse. Refer to para 4.26
and 4.41.
© Schaerer Mayfield USA, Inc. 2004
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