Stryker 3000 - Page 40

Chapter Three – Troubleshooting Guides
40
3.4 BED MOTION TROUBLESHOOTING GUIDE (CONTINUED)
PROBLEM/SYMPTOM SOLUTION(S)
Bed will not raise when switch is depressed.
Bed will not lower when switch is depressed.
(continued)
E. (Continued) Unusual noise emitting from a me-
chanical lift assembly during operation may indi-
cate mechanical problems. Replace motor and/or
mechanical lift mechanism, if necessary. Check
power and sensor coil cords (p/n 3000–200–804 &
3000–200–807 head sensor coil cord & 3000–
200–805 foot sensor coil cord). If either sensor
cord is defective, lift lock light on foot board will
flash. Replace, if necessary (see pages 91 & 92).
F. Check head and foot lift potentiometers (p/n
3000–200–807 & 3000–200–806). Check gear on
potentiometer shaft for proper alignment and cou-
pling. Ensure gear is securely mounted on the
shaft. Replace as necessary (see pages 89 & 90).
G. Check head and foot motor capacitors (p/n
3000–300–243). Replace as necessary (see page
77).
H. Check litter CPU board (p/n 3000–300–941).
Verify the following: (see page 199 for board loca-
tion)
1.) 110 VAC at connector P1, pins 5 and 8 when
Bed Up switch is pressed. Pins 4 and 9 when Bed
Down switch is pressed.
2.) +12 VDC at cathode of D11. Use digital
ground as a reference (negative lead on C18).
If appropriate output signals are not present, re-
place litter CPU board (see page 115).