Stryker 2031, Maintenance Manual, Page: 25 / 185

page 3–2
Troubleshooting Guide
DEFINITIONS:
DMM = Digital Multi–Meter
PCB = Printed Circuit Board
CPU = Central Processing Unit
NOTE
See page 4–2 through page 4–7 for an outline of bed PCB’s and voltage test points.
PROBLEM/FAILURE RECOMMENDED ACTION
No power to bed A. Check circuit breaker on bed.
B. Check for 120 VAC power at J1 on power sup-
ply. See page 4–4 for power supply voltage test
points.
C. Check for DC voltages on J2 (Pins 1,2,3 & 6)
on power supply. See page 4–4 for power supply
voltage test points.
No bed down motion. A. Enter diagnostics, (see page 7–2) and press
bed down. If motion is present, re–burn lift poten-
tiometers. Monitor Pin 3 and Pin 2 of HDR7 and
HDR12 on the CPU PCB using DMM. Verify volt-
age changes on Pin 3 with changes in lift motion.
See page 7–8 for voltage parameters for low and
high limits.
B. If no down motion in diagnostic, check for 120
VAC power on HDR33 and HDR34, Pin 1 and Pin
3, of the CPU.
C. Check for 1.1–1.5 VDC signal on O6 and O8
Pin 1 and HDR2 Pin 5 of the CPU PCB.
D. Check for motion interrupt jumper on HDR3.
No bed up motion. A. Check 120 VAC power on HDR33 and HDR34,
Pin 1 and Pin 6, of the CPU board.
B. Check for 1.1–1.5 VDC signal on O5 and O7
Pin 1 and HDR2 Pin 5 of the CPU PCB.
No Gatch down motion. A. Check for 120 VAC power on HDR30 Pin 1 and
Pin 3 of the CPU board.
B. Check for 1.1–1.5 VDC signal on O3 Pin 1 and
HDR2 Pin 5 of the CPU PCB.
No Gatch up motion. A. Check for 120 VAC on HDR30, Pin 1 and Pin 2
of the CPU board.
B. Check for 1.1–1.5 VDC on O1 Pin 1 and HDR2
Pin 5 of the CPU PCB.
No Fowler down motion. A. Check for 120 VAC power on HDR29 Pin 3 and
Pin 1 of the CPU board.
B. Check for 1.1–1.5 VDC signal on O4 Pin 1 and
HDR2 Pin 5 of the CPU PCB.
No Fowler up motion. A. Check for 120 VAC on HDR29, Pin 1 and Pin 3
of the power supply.
B. Check for 1.1–1.5 VDC on O2 Pin 1 and HDR2
Pin 5 of the CPU PCB.