Chapter Three – Troubleshooting Guides
54
3.12 VOLUME CONTROL TROUBLESHOOTING GUIDE (CONTINUED)
PROBLEM/SYMPTOM SOLUTION(S)
Volume control does not work when switches are
depressed. (continued)
Note: step D not necessary if volume test in step
C is acceptable.
D. If volume is still uncontrollable, check litter CPU
board (p/n 3000–300–941) for voltages at the fol-
lowing connectors, use pin 7 as digital ground:
1.) P10, right siderail, pin 10 –– +5 VDC
pin 5 –– +8 VDC
2.) P11, left siderail, pin 10 –– +5 VDC
pin 5 –– +8 VDC
(See page 199 for board location).
If voltage is not present, check fuse F1. If fuse is
O.K. and voltage is not present, replace litter CPU
board (see page 115).
Speaker volume not adequate. A. Check headwall IFC board (p/n 3000–303–933)
according to solution C in section on previous
page. If headwall IFC volume control is O.K.,
visually check speaker and connections in problem
siderail. Replace speakers as needed (left speak-
er p/n 3000–403–831, right speaker p/n 3000–
403–832). If speakers are O.K., and problem still
exists, check for audio signal from TV/Radio.
Connectors P2 and P3 on headwall IFC board, pin
1, speaker high and pin 2, speaker low common.
If audio signal is not present and/or adjustable,
check hospital wiring to and from TV/Radio.
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