Service Activities; Component Replacement - Welch Allyn SureTemp 986 Service Manual

2. Service

2.2.4 Service Activities

2.2.5 Component Replacement

14
8. Reinstall the batteries (see page 15) and verify a successful
self-test.
9. Reinstall the probe connector and insert the probe into the
storage well to start the probe initialization process.
10. Verify proper calibration of the thermometer and probe using
the Welch Allyn Model 9600 Calibration Tester.
Field Service Repairs
Repairs are considered field serviceable if the repair will not alter
the calibration or proper operation of the instrument. Recalibration
requires a computer-based system and is normally performed at
the factory.
Factory Repairs
Because of programming requirements, if problems are traced to
microcontroller U1, the unit must be returned to the factory or
properly equipped service center for repair.
All components in the Model 986 can be replaced without affecting
instrument operation or calibration. Changing R13 will cause some
minor changes to the exact calibration point, but as long as the
proper type and tolerance resistors are used (0.05%, as supplied
by Welch Allyn), the unit will remain within specifications.
LCD Frame Repair or Replacement
Replacement of the LCD frame is somewhat difficult due to the
need to assemble it while under pressure to assure proper
compression of the elastomeric connector.
Note: Do not glue the LCD frame to the display PCB if the frame
pins are broken. This will destroy the display PCB. Replace
the LCD frame with a new LCD frame.
70995-0000B M986