Welch Allyn TM286 Auto Tymp - User Manual User Manual
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Routine Maintenance
Welch Allyn TM286 Auto Tymp
Probe reassembly
After cleaning, reassemble the probe nose cone to the probe body by screwing the cone
back onto the probe. Take care to align the threads on both the probe body and the nose
cone before screwing the pieces together. Only screw the nose cone on until it is finger
tight. It may be helpful to gently squeeze the two sides of the probe case together while
screwing the nose cone into place.
Earphone Care
With proper care, the earphone and cords provided with the instrument should last a long
time. Moisture should not be allowed anywhere near the earphone itself as this will
damage the diaphragm and grill cloth, requiring its replacement. The earphone cushions
can be wiped with a slightly damp cloth, taking care not to get moisture in the speaker
portion of the earphones.
With extended use, earphone cords tend to fray internally at the connectors (i.e.,
between the cord and the instrument's connector, and between the cord and the
earphone connector). This fraying may cause a decrease in the signal level or cause the
signal to be intermittent. To check for this:
1.
Position the test headset properly and select a frequency (e.g., 1000 Hz) at 35 dB HL.
2.
Select the right earphone and press the Present bar.
3.
While the Present bar is depressed, flex the earphone cord next to the connector at
both ends.
4.
Listen for an intermittent signal, an abrupt change in signal intensity level or a scratchy
sound superimposed over the selected frequency that coincides with the flexing of
the cord. The presence of any of these conditions indicates that the cord should be
replaced.
5.
Also, examine the earphone cord for cuts or tears in the covering shield and the
earphone cushion for signs of damage. If either problem is noticed, the earphone cord
or cushion should be replaced. Both parts are easily replaced without the need for
recalibration. However, if the earphone receives shock damage or is replaced for any
reason, the instrument will need to be recalibrated.
6.
Repeat this same sequence with the left earphone.
Paper supply
To streamline each testing session, it is a good idea to check the amount of paper left
inside the printer compartment. Extra rolls of paper should be kept nearby.
Note
The probe nose cone must be screwed firmly in place to guard against any air
leaks.
Note
The number of tests per roll of paper will vary with the version Auto Tymp being
used and the type of tests being performed. (See
of this guide for
approximations). Replacement paper can be purchased from Welch Allyn at Tel.:
1-800-535-6663 (In U.S.A. only) or Tel.:1-800-561-8797 (in Canada only).