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System Troubleshooting Guide
Symptoms and Suggestions
Copyright © TekTone Sound & Signal Mfg., Inc. All Rights Reserved.
Standalone Bath and Code Station Connections: Refer to
Common Connector:
Gray
Red Dome Output
Wire Color Description
Violet
White Dome Output
Blue
+12 VDC
Green
Data Common
Yellow
Data Out
Orange
Data In
Red
Negative
Brown
+24 VDC
• Confirm that the station actually has a code device connected to it.
Code Fault Indication (SF341B)
• If a code station is present, then verify the trickle current loop path. Disconnect
the Code A and Code B lines from the peripheral connector on the back of the
patient station. Using an ohmmeter, read across the two lines for the loop
resistance (approximately 47,000 ohms). Wiring continuity must also be verified.
• The code station and associated patient station can be swap tested with other
"known-good" devices.
Comm. Fault Indication (patient station fault)
• Determine if the comm. fault is singular or a large group of patient stations. (If using
NC306 Master Station, press the zone button twice to have master station indicate
which points are in fault.)
• If the faults are a large group, then the associated common wiring to that section of
rooms must be examined for opens, shorts and grounds. The actual architectural room
numbers can assist in the physical location. If the faults represent all of the stations
on the patient station port, then the port may no longer be working. Swap testing
between ports can be performed. The installer will need to perform the Detect System
Stations command from the System Functions menu (see the
and Programming
chapter for details). Once the problem has been identified, corrected,
and the ports returned to their original configuration, the Detect System Stations
• If the fault is a single device, verify the local room wiring (connections and plug-
command will need to be executed again.
on connector) for continuity, opens, shorts and grounds. The patient station may
also be swap tested with another "known-good" device for verification.
Verify that common cable shield drain wires have been kept isolated and fed through
Data or Polling Noise
at splice points. At the end of a cable run, the shields must be isolated and taped
back. Noise transference is a cumulative effect and is worsened for each error in
connection. NOTE: The included connection harness ("pigtail" or "whip" connector)
brings the shields together prior to entering the central equipment chassis. Thus,
if an ohmmeter is used to check for continuity between shields, the connection
harness must be removed prior to taking the reading.
Figure
51.
+24 VDC when lamp is off; 0 to +1 when
Voltage Reading
lamp is on.
+24 VDC when lamp is off; 0 to +1 when
lamp is on.
+11 to 12 VDC.
0 VDC.
+8 to 11 VDC.
+4 to 6 VDC.
0 VDC.
+24 VDC.
System Configuration
IL715 Tek-CARE
NC300II Manual • 79
®
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