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Chapter Three – Troubleshooting Guides
63
3.18 BRAKE NOT SET INDICATOR TROUBLESHOOTING GUIDE
NOTE
Before replacing any circuit boards, ensure applicable cables and connections are intact (visually and me-
chanically). 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.
If brakes engage at one end of the bed only, push down on the brake pedal twice to engage and disengage
the brakes. This will reset the brake mechanism. Pressing down once on the pedal should now set the brakes
at both ends of the bed.
PROBLEM/SYMPTOM
SOLUTION(S)
BRAKE NOT SET light does not flash when
brakes are not set (siderail and foot board indica-
tors).
A. If all Brake Not Set indicators do not flash, use
a voltmeter to check brake switch (p/n 3000–300–
58). Replace switch, if necessary.
B. If switch is O.K., check adjustment of mounting
bracket. When brake is not set, switch plunger
should clear brake bar. When brake is set, brake
bar should move down causing switch plunger to
actuate. If this does not happen, adjust switch
mounting bracket (with brake set) up slowly until
switch actuates. To ensure consistent actuations,
bend bracket up an additional 1/8” of switch plung-
er travel. Engage and disengage the brakes sev-
eral times. Visually check that switch plunger
clears brake bar by approximately 1/4” when brake
is not set. If Brake Not Set indicator does not stop
flashing when brake is set, check switch bracket
and repeat step B. Prior to adjustment, the switch
bracket may need to be bent down.
C. If brake switch and bracket are O.K. check for
+5 VDC to switch. If voltage is present and Brake
Not Set indicator still doesn’t flash, engage and
disengage the brakes and monitor connector P13,
pin 8 on litter CPU board (see page 199 for board
location). If +5 VDC doesn’t cycle on and off with
brakes, check cable and connections from switch
to litter CPU board. Replace as needed. If volt-
age at connector P13, pin 8 does cycle with brake
pedal actuations and Brake Not Set light doesn’t
flash when brakes are not set, replace litter CPU
board. If voltage isn’t present to brake switch,
check litter CPU board for +5 VDC at connector
P13, pin 7. If voltage isn’t present, check fuse F1
and replace, if necessary. If fuse is O.K., check
for 110 VAC at connector P1, pin 10. If voltage is
present, replace litter CPU board (page 115).
D. If 110 VAC is not present, check power junction
board (p/n 3000–300–961) at connector P1, pin 1
for 110 VAC. If voltage is not present, check fuse
F1. If fuse is O.K., check connector J1, pin 2 (hot)
for 110 VAC input into board. Replace fuse or
power junction board, 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 ...