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Troubleshooting Guide
SIDERAILS
Each siderail contains an outside and and inside switch board. Power to the siderails is provided by the CPU
board. Determine if the problem exists only in one siderail or in both siderails.
A.) If the problem is isolated to one siderail, switch the siderail connectors on the CPU. If the problem is trans-
ferred to the other siderail, and the “bad” rail is now functional, the CPU needs to be replaced. If the problem
is not passed to the other rail and the “bad” rail is still non–functional, verify the cable connections in the side-
rail are intact. If the connections are intact, replace the “bad” siderail’s switch board.
B.) If the problem exists in both siderails, verify the voltages at the CPU for the siderails. If the proper voltages
are not present, replace the CPU. If the proper voltages are present, the siderail boards are probably O.K.
and troubleshooting the individual component (head motor, knee motor, etc.) for the function is required.
FOOT BOARD
A full option foot board contains the main foot board PCB, a bed exit board, a scale switch board, and a scale
LCD. Power to the foot board is provided by the CPU. Determine if the problem exists only at the foot board
or also at the siderails.
A.) If the problem exists only at the foot board, use a foot board from another bed and verify that the problem
persists. If the problem is gone when the foot board is changed, replace the non–functional module on the
original foot board.
NOTE
The main foot board PCB (part number 3001–500–900) has interface responsibilities. All switch boards on
the foot board are connected to this board. Verify the connections are intact. If they are, the problem could
be either the main foot board computer board or the switch board.
If the problem does not go away with another foot board, verify the voltages to the foot board on the CPU.
If the proper voltages are not present, replace the CPU. If the voltages are present, check the cable from
the CPU to the foot board receptacle. Verify the foot board receptacle pins on the litter are intact.
B.) If the problem exists not only at the foot board but also at the siderails, troubleshooting the individual com-
ponent (head motor, knee motor, etc.) for the function is required.
BED LIFT
The height of the bed is adjusted by a separate lift motor on each end of the bed in the lift unit. The motor
is coupled with a series of gears that run the lift screws to move the litter up or down. When the bed lift or
Trendelenburg button on either the foot board or siderail is pushed, the signal passes through the CPU and
into the power board, activating a relay on the power board to energize the lift motor(s) from the power board.
The motor limits are held by a potentiometer (pot) on each lift unit. As the lift screws turn, the pot is turned.
As the voltage changes across the pot, the CPU recognizes when to shut off the motor signal at both the high
and the low end.
A.) If either lift motor electrically stops prematurely, or continues to run past it’s limit, try “burning–in” the lift
pots (see page 91). If the problem persists, check voltage at the CPU with the bed in the full up position.
If the voltage is too high, the pot has moved out of calibration and requires resetting. If resetting the pot does
not solve the problem, the lift pot probably needs to be replaced (see pages 66 & 67).
B.) If one of the lift motors does not run at all, listen for a relay “click” on the power board when the button
is pressed. If the relay is activating, try “burning–in” the lift pots (see page 91). If the “burn–in” procedure
doesn’t help, either the power board is not providing proper voltage to the motor, the cable is not transferring
power to the motor, the motor capacitor has failed or the motor itself has failed. Check all of these factors
to isolate the problem.
If a relay is not being activated when the button is pushed, check the secondary voltage signals from the CPU
at the power board. If proper voltage is present at the power board, replace the power board (see page 90).
If proper voltage is not present at the power board, replace the CPU board (see page 90).
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