System Troubleshooting Guide
Red White Dome Output +24 VDC w/ lamp off, 0 to +1 VDC when lamp is on.
Brown Peripheral LEDOutput +1 to 2 VDC when no calls are active. A constant pulsing to
+12 VDC when a bath or emergency call is placed.
Standalone Bath and Code Station Connections:
Common Connector:
Wire Color Description Voltage Reading
Gray Red Dome Output +24 VDC when lamp is off; 0 to +1 when lamp is on.
Violet White Dome Output +24 VDC when lamp is off; 0 to +1 when lamp is on.
Blue +12 VDC +11 to 12 VDC.
Green Data Common 0 VDC.
Yellow Data Out +8 to 11 VDC.
Orange Data In +4 to 6 VDC.
Red Negative 0 VDC.
Brown +24 VDC +24 VDC.
Symptoms and Suggestions
Code Fault Indication (SF341B)
l Confirm that the station actually has a code device connected to it.
l 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 ohm-
meter, read across the two lines for the loop resistance (approximately 47,000 ohms). Wiring con-
tinuity must also be verified.
l The code station and associated patient station can be swap tested with other “known-good”
devices.
Comm. Fault Indication (patient station fault)
l Determine if the comm. fault is singular or a large group of patient stations.
l If the fault is coming from a single station, check the voltage at that station. If the faults are com-
ing from a large group of patient stations, check the voltage at the NC356CE.
l 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. Once the
problem has been identified, corrected, and the ports returned to their original configuration, the
Detect System Stations command will need to be executed again.
l If the fault is a single device, verify the local room wiring (connections and plugin connector) for
continuity, opens, shorts and grounds. The patient station may also be swap tested with another
“known-good” device for verification.
Data or Polling Noise
Verify that common cable shield drain wires have been kept isolated and fed through 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
30|IL1057 Tek-CARE300III Installation Manual
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