Troubleshooting Guide
42
This section of the troubleshooting guide includes the Zoom self−propelled drive and the battery backup
functions. When using this guide, assume the bed is functioning properly when powered by the AC line cord
with the exception of the battery charging components.
PROBLEM/FAILURE POSSIBLE CAUSE RECOMMENDED ACTION
ON/OFF switch is in the on
position but the power LED
is off and the bed does not
function.
No DC voltage from the batter-
ies.
A. Check the circuit breakers at the head end of the
bed.
B. Verify the battery voltage is greater than 24 VDC.
C. Check the battery fuse − replace if necessary
(p/n 2040−1−802).
D. Check the cable connections from the batteries
to the display board.
E. Check the ON/OFF switch and cabling.
ON/OFF switch is in the on
position, the power LED is
on but the bed does not
function.
Display board is not functioning
or is locking out all functions.
A. Check the safety switches on the drive bar.
B. Verify the battery voltage is greater than 24 VDC.
C. Verify the display board is functioning (see note
below).
D. Check all cable connections on the display and
power boards.
ON/OFF switch is in the on
position, the power LED is
on, the Zoom drive works
but the battery backup does
not work.
The thermostat on the inverter/
charger board has tripped, indi-
cating a temperature above
110 C (230 F).
A. Wait approximately 3−5 minutes to allow the in-
verter/changer board to cool down.
The Zoom drive does not
work − the bed does not
drive − but all other functions
are working.
Zoom drive circuitry is not re-
sponding.
A. Verify the display board is functioning (see note
below).
B. Perform the control bar potentiometer “burn−in”
procedure (see page 88).
C. Check the control bar potentiometer. When the
bar is centered, there should be 2.25VDC − 2.75
VDC between pin 1 and pin 2 on header 1 on the dis-
play/CPU board (see page 52)
D. Check all cable connections on the display and
power boards.
E. Verify the power board is functioning.
F. Verify the drive wheel is functioning.
The Zoom drive does
work − the bed will drive −
but all other bed functions
are not working.
No AC power from the Zoom
base.
A. Check AC voltage coming out of the inverter. It
should be 120VAC between pin 1 and pin 4 on head-
er 5 on the AC crossover board (see page 53)
B. Check all cable connections from the batteries
to the converter.
C. Check the AC crossover board.
The bed power cord is
plugged in but the battery
does not charge.
The battery charger is not func-
tioning.
A. Check the circuit breakers on the litter.
B. Check the battery charger.
C. Check all cable connections on the charger.
NOTE
The display board will display the state of battery charge when the bed is first powered using the ON/OFF switch:
Three LED’s flash = 66% − 100% charged
Two LED’s flash = 33% − 66% charged
One LED flashes = less than 33% charged
No LED’s flash = No significant charge remaining.
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