Troubleshooting Guide
40
NOTE
See pages 45−54 for an outline of bed PCB’s and voltage test points.
PROBLEM/FAILURE RECOMMENDED ACTION
No power to bed A. Verify the power cord connections at the wall and the bed.
B. Check circuit breakers, under the litter/gatch section on the
patient left side. If the circuit breaker is tripped, reset it by
pushing in.
C. Check for 120 VAC at J1 on the power supply, Pin 1 and 2.
D. Check for DC voltages on J2 (Pins 1, 2, 3 & 6) on power
supply. See page 50 for power supply voltage test points.
a. If voltage is present, check connector W on the CPU board
and check for the same DC voltages. If OK, go to step E.
b. If voltage is not present, unplug connector W on the CPU
board and recheck for DC voltages at J2 on the power
supply.
1. If voltages come back, re−connect cable W to the CPU
board, and go to step c.
2. If DC voltage does not come back, replace the power
supply.
c. Unplug all connectors except for F, FF, O, and W from the
CPU board and recheck voltages on connector W
1. If DC voltages come back, plug the cable connections
back in until problem comes back, isolate the problem to
a component or assembly.
2. If DC voltages do not come back, replace the CPU board
E. Check for 120 VAC at connector O on the CPU board.
a. If voltage is present, replace the CPU board.
F. Verify bed function and return to service.
No bed down motion. A. Enter diagnostics, (see page 80) and press bed down.
a. If motion is not present, verify there is a two−pin shunt
present on connector Z, closest to the center of the bed, if
not, install shunt.
1. Test bed down motion, if motion is present then go to step
D.
b. If motion is present, re−burn lift potentiometer limits, see
page 65 for procedure.
B. Check for 5 VDC on TP 9 (HL) and TP 7 (FL), see page 45.
a. If 5 VDC is present, go to step C.
b. If 5 VDC is not present, replace CPU board.
C. Check for 120 VAC power on connector N (HL) and G (FL),
pin 1 white and pin 3 black, of the CPU board, while pressing
bed motion up.
a. If voltage is not present, replace CPU board.
b. If voltage is present:
1. Verify the motors are running, if so, replace lift couplers.
2. If motors are not running, check voltage at motor
connection.
3. If voltage is present at motor, check capacitors or motors.
D. Verify bed function and return to service.
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