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Chapter Three – Troubleshooting Guides
53
3.12 VOLUME CONTROL TROUBLESHOOTING GUIDE
NOTE
Before proceeding, check Docker cable visually for proper connection and/or external damage Ensure Dock-
er cable is compatible with Nurse Call system being utilized. Check +5 VDC at various points called out in
the troubleshooting by using digital ground as a reference point (negative side of C18 on the litter CPU board).
Digital ground reference may also be used at headwall IFC board connector P1, pin 7. Prior to replacing any
boards, ensure applicable cables and connections are intact (visually and mechanically).
Depress each volume switch one at a time to isolate possible problem. Observe whether any switches are
not functioning properly. Isolate the problem to an individual siderail and then to an individual switch board
module. If bed is equipped with optional pendant, remove pendant from bed. If problems are isolated to the
pendant, replace the pendant.
PROBLEM/SYMPTOM
SOLUTION(S)
Volume control does not work when switches are
depressed.
A. Check if problem exists in only one siderail.
Check for +5 VDC at the following locations: (see
page 200 & 201 for board locations)
1.) Left TV keyboard (p/n 3000–404–923), connec-
tor J1, pin 1.
2.) Right TV keyboard (p/n 3000–404–907), con-
nector J1, pin 1.
Using a voltmeter, verify volume switches are O.K.
If voltage is present and switches are not O.K.,
replace keyboards.
B. Check inside siderail Gatch/Fowler boards (p/n
3000–400–917, left inside & 3000–400–901, right
inside) for +5 VDC at connector P1, pin 10 for
both boards. If voltage is present and problem still
exists, replace boards. Note: if Gatch/Fowler inner
siderail board is defective, all non–motion func-
tions will cease to work in the entire siderail.
C. Check headwall IFC (p/n 3000–303–933) for
+12 VDC at connector P6, pin 1 (see page 199 for
board location). Check for +5 VDC at connector
P5, pin 11. If voltage is not present, replace head-
wall IFC board. Apply +5 VDC to DB37 pin con-
nector (Docker cable jack).
1.) +5 VDC to pin 15, Pot High Comm.
2.) Negative (ground reference) of supply to pin
14, Pot Low Comm. Using a voltmeter, monitor
pin 23 (Pot Wiper), using pin 25 as a reference
point. While the Volume Up switch is pressed,
voltage on voltmeter should increase. While the
Volume Down switch is pressed, voltage on volt-
meter should decrease. The voltage should in-
crease and decrease in a total of 16 incremental
steps (16 steps total range). If the voltage does
not increase and decrease properly, replace head-
wall IFC board.
Summary of Contents for Secure 3000
Page 78: ...Notes 78 ...
Page 106: ...Notes 106 ...
Page 184: ...Notes 167 2 ...
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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 ...