User Manual

Patient Safeguard System – Healthcare Worker Badge User’s Guide UltraClenz, LLC
Page 11
Healthcare Worker Badge Power On Self Test (POST)
Insert the new 3VDC coin cell battery into the battery holder on the PCB1034. Observe and verify the sequential
LED functions below. If the PCB fails any of the steps below, set it aside for inspection and rework.
1. As the PCB powers up, it performs a power on self test (POST). The red, yellow and green LED will flash
once each in consecutive order. This test will verify that the LEDs are working. See Figure 12 for LED
locations.
2. The PCB will then tune the X, Y and Z antennas (L1). The green LED will flash several times as the X
antenna is tuned. Then the yellow LED will flash several times as the Y antenna is tuned. Finally, the red
LED will flash several times as the Z antenna is tuned.
NOTE: During the antenna tuning process, if a short beep is heard after any one of the X, Y or Z antenna
tuning cycles (green, yellow or red LED flash), the corresponding antenna did not tune properly. Typical
reasons for failure include incorrect capacitor values for any of C1 to C5 or an unconnected lead on L1.
3. After the antennas have tuned, the green and yellow LEDs will alternately flash back and forth while
tuning U1’s internal RC oscillator.
NOTE: If a failure occurs, the red LED will flash twice along with 2 short beeps from the piezo. This rarely
happens and the cause is usually poor soldering of U1.
4. A long chime will then be heard to conclude the POST. This chime will verify the operation of the piezo.
5. Once the POST has completed, the green LED will blink once every 1.5 seconds to indicate normal
operation.