Welch Allyn SureTemp 670 - TROUBLESHOOTING

Welch Allyn, Inc.
22 SureTemp
®
Model 670/SureTemp 4
®
Model 675
Error Code Table (continued)
System Functional Errors
E3.0 NON-RECOVER Low battery error
E3.1 RECOVERABLE PTB test error
E3.2 TRANSITORY Outside operating temp range
Math Errors
E4.0 RECOVERABLE Floating point over flow
E4.1 RECOVERABLE Log of zero is undefined
Warmer and Probe Errors
E5.0 RECOVERABLE Q warmer transistor failure
E5.1 RECOVERABLE C warmer transistor
E5.2 RECOVERABLE Warmer protection circuit failure
E5.3 TRANSITORY Probe warmer not warming
E5.4 TRANSITORY Probe missing or thermistor failure
E5.5 RECOVERABLE Warmer circuit failure
E5.6 RECOVERABLE Warmer overheated
E5.7 RECOVERABLE Warmer watch dog time out
Serial Communications Errors
E6.1 RECOVERABLE Serial overrun error
E6.2 RECOVERABLE Serial framing error
E6.3 RECOVERABLE No data time out error
E6.4 TRANSITORY Transmit buffer overflow (transmit only, no display)
System Software Errors
E9.9 RECOVERABLE Undefined software state
TROUBLESHOOTING
Many thermometer operational parameters can be tested for proper operation before the unit is taken apart
and without needing any tools. Refer to the
Operational Characteristics
section on page 2 and in
particular to the
Setup
and
Biotech Mode
sections for guidance on preliminary checks.
If the trouble seems to be calibration related, refer to the
Calibration Testing
section on page 12.
If these sections do not prove useful in resolving the problem and you are sure that the instrument is not
performing properly, the following sections should guide you through the debugging process given the
proper tools and equipment.
Equipment Required
Most operations can be performed with standard tools and meters. A #1 Phillips screwdriver suffices for all
instrument screws.
A standard lab 3.5 digit digital multi-meter (DMM) will provide sufficient accuracy for a host of tests. A
needle tipped pair of probes is recommended.
For particularly difficult tasks, an oscilloscope is sometimes the only way to analyze high speed signals, but
is not generally required.
Standard electronics tools and supplies for small surface mounted and through hole component rework will
be needed to perform any electronics repairs. Some surface mounted components are extremely small and
present a challenge for rework by hand. A light touch, tweezers, sharp soldering iron tip and low heat (#7
tip) is recommended.