Post (Power Up Self-Test); Probe Type Test; Figure 3: M986 Display - Welch Allyn SureTemp 986 Service Manual

2.1.4 POST (Power Up Self-Test)

2.1.5 Probe Type Test

Model 986 Thermometer
The self-test includes a series of internal microprocessor self
tests, instrument electronics tests, and the display test. If there are
internal electronics problems detected by the self-tests, the Err
(error) icon will be displayed and an audible tone will sound. Refer
to the Error Codes table in the Troubleshooting section (page 19)
for an explanation of any error code. The M986 electronics are
tested each time the batteries are replaced.
•
The Power up test begins with all display segments and icons
simultaneously illuminated, followed by a display of the
software revision in this instrument. The M986 beeper also
briefly sounds at the beginning of the test.
•
At the end of the test, the display goes blank and the unit is
ready to operate.
If there is no display, any missing segments, or no beeper, refer to
the Troubleshooting table (page 22).
Test the probe to make sure that the correct type of probe is
attached to the unit.
With the probe shaft in the probe well and the display blank, press
the Mode button for three seconds. After three seconds, the
instrument will beep and the display shows the
the measuring site blinking.
•
For a blue (oral/axillary) probe, either the head or arm should
blink, depending on whether the instrument is configured for
Oral or Axillary measurements.
•
With a red (rectal) probe, the leg icon should blink.
If the wrong icon is blinking, there is a problem with either the probe
or the probe type configuration in the instrument.
1. Refer to the mode table on the schematic diagram (Appendix D).
2. In the mode table, locate the type of instrument – oral only,
rectal only, etc. that you are using.
3. Open the thermometer and locate the jumpers. Verify that the
jumpers are configured for your type of unit.
4. If the jumpers are not configured properly, contact Welch Allyn
Customer service for assistance.

Figure 3: M986 Display

2. Service
icon with
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