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Chapter Three – Troubleshooting Guides
41
3.5 KNEE (GATCH) SECTION RAISE/LOWER TROUBLESHOOTING GUIDE
NOTE
Before proceeding, ensure all cables and connections are intact (visually and mechanically). To check for
+5 VDC at various points called out in the troubleshooting, use digital ground as a reference point (negative
side of C18 on CPU litter board). When measuring 110 VAC at any point, use only the neutral (white) side
of the power line as a reference point. DO NOT use digital ground as a reference point when measuring 110
VAC.
PROBLEM/SYMPTOM
SOLUTION(S)
Knee Gatch does not raise electrically.
Knee Gatch does not lower electrically.
A. Check power junction board (p/n 3000–300–
961) for 110 VAC (output at connector P1, pin 1,
input at connector J1, pin 2 (see page 199 for
board location). If output 110 VAC is not present
while input is present, check fuse F1. Replace
board and/or fuse, if necessary.
B. Check for 110 VAC to Gatch motor (p/n 3000–
300–410) when any Gatch up/down switch is
pressed. If voltage is present and motor will not
operate, see step E. If voltage is not present,
check for 110 VAC through CPU litter board (see
page 199 for board location). (Connector P1, pin
18, input. Connector J2, pins 2 & 5 knee up, and
pins 3 & 4 knee down). Replace CPU litter board
(p/n 3000–300–941), if necessary (see page 115).
C. Check cam switch (p/n 3000–300–40) and cam
mechanism for proper operation. The cam mech-
anism determines travel limits for knee section
motion. Adjust and replace appropriate parts as
necessary (see page 98). Check the cam, cam
guide and wire linkage. Switches can be checked
with a multimeter.
D. Check keyboards in siderails, foot boards and
pendant control for +5 VDC potential at switches
and verify switches function properly (see pages
200, 201, 216 & 217 for board locations).
Points on keyboard to check for +5 VDC:
Foot board keyboard (p/n 3000–501–947) – pin 1
of connector P1.
Left inner siderail keyboard (p/n 3000–400–917)
pin 10 of connector P1 (use pin 7 as a ref. point).
Right inner siderail keyboard (p/n 3000–400–901)
pin 10 of connector P1 (use pin 7 as a ref. point).
Left outer siderail keyboard (p/n 3000–400–931)
pin 4 of connector J1.
Right outer siderail keyboard (p/n 3000–409–913)
pin 1 of connector J1. Replace cables and key-
boards, if necessary.
Check CPU litter board (p/n 3000–300–941) for +5
VDC at connector P14, pin 5. If voltage is not
present, check fuse 1. Replace fuse, if necessary.
Summary of Contents for Secure 3000
Page 78: ...Notes 78 ...
Page 106: ...Notes 106 ...
Page 184: ...Notes 167 2 ...
Page 241: ...Appendix B Circuit Board Locations Bed Wiring Diagrams 222 This page intentionally left blank ...
Page 243: ...Appendix B Circuit Board Locations Bed Wiring Diagrams 224 This page intentionally left blank ...
Page 249: ...DH 3 94 3000 000 020 REV B 420 Alcott Street Kalamazoo MI 49001 ...