Welch Allyn, Inc.
30 SureTemp
®
Model 670/SureTemp 4
®
Model 675
FIELD SERVICEABLE 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.
All probes designed to work with the thermometer are fully interchangeable.
All components in the Model 670 and Model 675
except U1 and U3
can be replaced without effecting
instrument operation or calibration. Some minor changes to the exact calibration point will be caused by
changing R3, R5 and R8, but as long as the proper type and tolerance resistors are used (0.1%, as supplied
by Welch Allyn), the unit will remain within specifications.
Replacement of the LCD frame is somewhat difficult due to the need to “heat stake” the assembly while
under pressure to assure proper compression of the elastomeric connector. The LCD frame once removed
cannot be re-used.
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.
FACTORY SERVICEABLE ONLY REPAIRS
Because of programming requirements and characterization requirements, if problems are traced to U1 or
U3, the unit must be returned to the factory or properly equipped service center for repair. Very specialized
custom test equipment is required to perform recalibration and characterization after replacing U1 or U3.
FIELD SERVICEABLE PARTS
All parts are serviceable by qualified technicians except for the EEPROM (U3) and the Monochip (U1).
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