Welch Allyn SureTemp 670 Specifikace stáhnout pdf (Strana 4)

ii Welch-Allyn, Inc.

4. THEORY OF OPERATION................................................................................................ 4-1

Technical Overview ........................................................................................................... 4-1

Probe Enhancements................................................................................................. 4-2

Probe Switch ..................................................................................................................... 4-2

Normal Mode.....................................................................................................................4-2

Power Supply ....................................................................................................................4-3

Low Battery Detection ................................................................................................ 4-3

Microcontroller............................................................................................................ 4-3

Reset/Self Tests......................................................................................................... 4-4

Microprocessor Clock................................................................................................. 4-4

Temperature Measurement and Display..................................................................... 4-4

Temperature Measurement A/D Converter................................................................. 4-4

Theory of Operation ................................................................................................... 4-4

Circuit Description ...................................................................................................... 4-5

Probe Identification Logic .................................................................................................. 4-6

Basic Function............................................................................................................ 4-6

Circuit Operation ........................................................................................................ 4-7

Probe Warming ( Oral probes only)................................................................................... 4-7

Theory of Operation ................................................................................................... 4-7

Circuit Operation ........................................................................................................ 4-8

Other Components............................................................................................................ 4-8

Liquid Crystal Display................................................................................................. 4-8

LCD Backlight (Model 678 Only) ................................................................................ 4-8

Probe Switch.............................................................................................................. 4-9

Mode Button............................................................................................................... 4-9

Timer Button (678 Only)............................................................................................. 4-9

Serial Communications Port....................................................................................... 4-9

Horn ........................................................................................................................... 4-9

5. TROUBLESHOOTING....................................................................................................... 5-1

Error Codes....................................................................................................................... 5-1

Equipment Required.......................................................................................................... 5-2

Troubleshooting Table....................................................................................................... 5-3

Field Serviceable Repairs.................................................................................................. 5-8

Field Serviceable Parts...................................................................................................... 5-8

Model 678/679 Replacement Parts.................................................................................... 5-9

Replacement Parts-Circuit Board Assemblies ................................................................. 5-10

Thermometer Disassembly.............................................................................................. 5-12

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Welch Allyn SureTemp 670 Specifikace Strana 4