Stryker Medical 2025, Maintenance Manual

Page: 29 / 140

Electrical Troubleshooting
28
TROUBLESHOOTING GUIDE
DEFINITIONS:
DMM = Digital Multi–Meter
PCB = Printed Circuit Board
CPU = Central Processing Unit
NOTE
See pages 33–38 for an outline of bed PCB’s and voltage test points. See page 19 for potentiometer calibra-
tion.
PROBLEM/FAILURE RECOMMENDED ACTION
No power to bed A. Verify power at wall outlet.
B. Unplug bed power cord and check continuity of fuses F1
and F2 on power board with DMM.
C. If fuses are good, plug power cord back into wall outlet.
D. Check for 120 VAC power at HDR1 on power board.
See pages 33 & 34 for power board voltage test points.
E. Check for DC voltages on HDR4 (Pins 4–7) on power
board. See pages 33 & 34 for power board voltage test
points.
No motor motion. A. Unplug bed power cord and check fuse F1 on power
board.
No bed down motion. A. Enter diagnostics, (see page 19) and press bed down.
If motion is present, re–burn lift potentiometer (see page
19). Monitor Pin 3 and Pin 2 of HDR28 on the CPU board
using a DMM for the foot pot. Monitor Pin 2 and Pin 3 of
HDR23 on the CPU board using a DMM for the head pot.
Verify voltage changes on Pin 3 with changes in lift motion.
See page 19 for voltage parameters for low and high limits.
B. If no down motion in diagnostic, check for 120 VAC
power on HDR6, Pin 4 and Pin 3 and HDR9, Pin 3 and Pin
4 of the power board.
C. Check for 5 VDC signal on CPU board, HDR32, Pin 1
and Pin 3 and Pin 1 and Pin 5 on CPU board.
D. Check for jumpers on HDR10 of the power and HDR24
of the CPU board.
No bed up motion. A. Check 120 VAC power on HDR6, Pin 4 and Pin 6, of the
power board.
B. Check for 5 VDC signal on CPU board HDR32, Pin 1
and Pin 6 on power board.
No knee up motion. A. Check for 120 VAC power on HDR8 Pin 13 and Pin 10
of the power board.
B. Check for 5 VDC signal on HDR33 Pin 1 and Pin 11 of
the CPU board.
C. Check for jumpers on HDR10 of the Power and HDR24
of the CPU board.
No knee down motion. A. Check for 120 VAC on HDR8, Pin 12 and Pin 13 of the
power board.
B. Check for 5 VDC on HDR33, Pin 1 and Pin 10 of the
CPU board.