Related Manuals for Welch Allyn SureTemp 986
Summary of Contents for Welch Allyn SureTemp 986
- Page 1 Thermo Menu Operator Manual Service Manual ® SureTemp Model 986 Thermometer Welch Allyn, Inc. 7420 Carroll Road San Diego, CA 92121...
- Page 2 70995-0000B Technical Manual M986 © 2001 © 2000, 2001 by Welch Allyn, Inc. All rights reserved. No part of this manual may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, without prior consent in writing from Welch Allyn, Inc. Printed in the USA...
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Page 3: Table Of Contents
Contents General Information ...................... 1 1.1 About the Model 986....................1 1.1.1 System Block Diagram................... 1 1.2 Technical Support..................... 1 1.3 Safety Warnings and Notices ..................2 Classifications......................2 1.5 About this Manual ....................3 1.5.1 Related Documents..................3 1.6 Return Procedure ..................... - Page 4 3.4.3 Replacement Parts for PCA ................27 Appendix A. Theory of Operation..................29 A.1 Overview ........................ 29 A.1.1 Temperature Probes ..................30 A.1.2 Probe Switch....................30 A.1.3 Normal Mode Description................30 A.1.4 Power Supply ....................31 A.1.5 Microcontroller..................... 31 A.1.6 Reset/Self Tests ..................31 A.1.7 Microprocessor Clock...................
- Page 5 List of Figures Figure 1: System Block Diagram ....................1 Figure 2: Model 986 Thermometer..................... 5 Figure 3: M986 Display ......................7 Figure 4: Peak Monitor Mode....................9 Figure 5: Battery Removal and Replacement ................15 Figure 6: Thermometer Assembly ...................
- Page 6 70995-0000B M986...
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Page 7: General Information
1. General Information About the Model 986 The Welch Allyn Model 986 SureTemp is a portable, predictive thermometer that accurately measures body temperatures in a few seconds at oral, axillary, or rectal sites. Oral/axillary and rectal probes utilize single use disposable probe covers to help limit cross-contamination. -
Page 8: Safety Warnings And Notices
Use of a probe at the wrong type of site will result in temperature errors. 4. Use only single-use Welch Allyn disposable probe covers. The use of any other probe cover or the failure to use a probe cover may produce temperature measurement errors and increase the chances for cross-contamination. -
Page 9: About This Manual
70994-1000 Model 986 Quick Reference Guide 71019-0000 This Service Manual assumes that the technician understands these operations. Return Procedure Contact Welch Allyn Customer Service at (800) 535-6663 before returning an M986 Thermometer to the factory for service. Model 986 Thermometer... -
Page 10: Terms Used In This Manual
1. General Information Terms used in this Manual The following abbreviations are used in this manual: Main Component Terms Printed circuit board (the board itself) Printed circuit assembly (with all components) Liquid Crystal Display BATT. Battery. Digital Multi-Meter O-Scope Oscilloscope Component Reference Terms Capacitor Diode... -
Page 11: Service
2. Service Basic Operation of the Model 986 The Model 986 is a portable digital thermometer. Service technicians should check the basic operation of the instrument before it is disassembled. 1 Probe cover ejection button 2 Probe cover box channel 3 Probe storage 4 LCD display 5 Mode button... -
Page 12: Major Thermometer Components
2. Service 2.1.2 Major Thermometer Components Batteries The Model 986 thermometer uses two standard disposable alkaline AAA cells. These batteries provide long life for reduced down time. No battery charging is required or possible. Probe Two types of probes are available: Oral/Axillary (blue), and Rectal (red). -
Page 13: Post (Power Up Self-Test)
3. Open the thermometer and locate the jumpers. Verify that the jumpers are configured for your type of unit. 4. If the jumpers are not configured properly, contact Welch Allyn Customer service for assistance. Model 986 Thermometer... -
Page 14: Operational Checks
2. Service 2.1.6 Operational Checks Normal Mode Normal mode operation is the rapid mode of temperature taking. This is the default mode and is automatically selected when the probe is withdrawn from the probe well. 1. When the probe is withdrawn from its storage well, every segment on the display will be illuminated. -
Page 15: Figure 4: Peak Monitor Mode
2. Service Temperature Display With correct use, the patient’s temperature will be displayed in about four seconds in oral mode, about 10 seconds in axillary mode, and about 15 seconds with a rectal probe. The instrument will beep to signal completion of the Normal Mode temperature cycle. - Page 16 Peak Monitor mode is also useful in testing the accuracy of the thermometer when the probe can be warmed to a known temperature, as with a Welch Allyn Model 9600 Calibration Tester or in a water bath (see section 2.4).
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Page 17: Default Algorithm For Oral And Axillary Modes (Blue Probe)
2. Service Temperature recall problems If the last temperature cannot be recalled, refer to Temperature Recall Problems in the Troubleshooting table on page 22. If pressing the Mode button does not change the scale of the displayed temperature, refer to Mode Button problems in the Troubleshooting table. -
Page 18: Preventative Maintenance
2. Service 2.2.2 Preventative maintenance Units that are used on a regular basis should have the following preventative maintenance performed at least every six months: 1. Visually inspect the thermometer for physical damage that might cause future product failure. 2. Clean the unit per the instructions in the User Guide supplied with the thermometer and/or per the instructions below. -
Page 19: Cleaning And Sterilization
2. Service 2.2.3 Cleaning and Sterilization Routine Cleaning Clean the exterior of the Model 986 and the probe as needed. • Use a Q-Tip to clean the probe well. • Wipe all surfaces with a clean cloth dampened with warm water and a mild detergent, alcohol, or a nonstaining disinfectant such as Sporicidin®... -
Page 20: Service Activities
(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. -
Page 21: Battery Removal And Replacement
2. Service Battery Removal and Replacement Figure 5: Battery Removal and Replacement 1. Remove the Probe Cover box holder on the back of the instrument by pressing with your index finger on the latch located on the rear of the Probe Cover box holder. 2. -
Page 22: Calibration Procedures
2. Service Calibration Procedures 2.4.1 Calibration Limits Table Patient Temperature Oral/Axillary 35.5° C to 43.0° C (96° F to 109.4° F) Rectal 30.0°C to 43.0° C (86° F to 109.4° F) Ambient Temperature Range 9.0° C to 40.0° C (48.2° F to 104.0° F) Laboratory Accuracy ±... -
Page 23: Model 9600 Calibration Procedure
Model 9600. Refer to the Model 9600 Operation Manual for complete instructions. Note: All Welch Allyn thermometers, (thermistor and infrared ear thermometers) can be checked in the Model 9600. If you are having problems with the use of the Model 9600, refer to the Troubleshooting section in the Model 9600 Operation Manual. - Page 24 2. Service 70995-0000B M986...
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Page 25: Troubleshooting
3. Troubleshooting 3. Troubleshooting Many operational parameters of the thermometer can be tested before the unit is taken apart. • Refer to Operational Checks (section 2.1.6) and Error Recall Mode (section 3.1.2) to complete preliminary checks. • If the trouble seems to be calibration related, refer to Calibration Testing (page 16). -
Page 26: Types Of Errors
(Section 3.1.2). Table 1: Self-Test Error Table Error Class Description Action E0.1 Instrument Probe heater energy accumulator Contact Welch Allyn test. E0.2 Instrument Probe A/D pulse width test. Contact Welch Allyn E1.1 Ambient Ambient temperature high test. Move unit to lower ambient temperature area and retry E1.2... -
Page 27: Error Recall Mode
3. Troubleshooting 3.1.2 Error Recall Mode The M986 has the ability to recall the most recent error condition from memory. To enter this program mode: 1. Place the unit in low power (sleep) mode by allowing it to rest for about 30 seconds. The display will go blank. 2. -
Page 28: Troubleshooting Table
3. Troubleshooting Troubleshooting Table If the unit fails to operate properly after completing the suggested procedure listed in the following table, contact Welch Allyn Customer Service at 1-800-535-6663. Symptom Possible Cause Procedure No operation Dead batteries, no batteries, Refer to Battery Removal and Replacement battery missing, battery section on page 15. - Page 29 3. Troubleshooting Symptom Possible Cause Procedure Switched to Monitor mode If probe is still cooling from a previous before probe in mouth temperature and used immediately, it might ° ° sense ambient to be above 33.9 C (93.0 Probe: Wrong Missing one or more Check that the configuration Jumpers are type displayed...
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Page 30: Disassembly/Reassembly
3. Troubleshooting Disassembly/Reassembly Refer to section 1.3 and review all safety warnings before attempting to disassemble the Model 986. Field Serviceable Parts 3.4.1 Main Components Figure 6: Thermometer Assembly Note: All parts are serviceable by qualified technicians. Please refer to Table 2 to check the part number for the items shown on this diagram. -
Page 31: Table 2: Main Components
3. Troubleshooting Table 2: Main Components Dwg Item Part # Description 21288-XXXX Printed Circuit Assembly 25245-0000 HSG, Front 25246-0000 HSG, Rear 25248-0000 HSG, Probe Cover 25249-0000 HSG, Battery 25244-0000 Frame, LCD 02986-000 ASSY, Probe, Oral 60028-0000 LCD, 2V 58582-0000 ZEBRA Strip LCD Connector 58577-0000 Horn 25247-0000... -
Page 32: Model 986 Pca
3. Troubleshooting 3.4.2 Model 986 PCA Jumper JP9 Battery Negative Battery Positive Jumper JP1-JP6 Figure 7: Printed Circuit Assembly 70995-0000B M986... -
Page 33: Replacement Parts For Pca
3. Troubleshooting 3.4.3 Replacement Parts for PCA Table 3: Replacement Parts for PCA Part Number Reference # Description Qty/Per 21288-0011 PC ASSY. MAIN, M986 56142-0000 PC BOARD,MAIN,M986 40290-0000 JP1, JP2, JP3,JP4 RES, 0 OHM, 5%, 0805 SIZE JP5, JP6,R62,R63 40290-1020 R5, R16, R31, R32 RES 1K, 5% 0805 SIZE 40290-1030... - Page 34 3. Troubleshooting 70995-0000B M986...
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Page 35: Appendix A. Theory Of Operation
Appendix A. Theory of Operation A.1 Overview The Model 986 includes two integrated circuits which provide most of the microcontroller and analog circuit functions. • All control and display functions are governed by the microcontroller (U1). • All probe analog data interfacing to the microcontroller is provided by U2. -
Page 36: Temperature Probes
Appendix A. Theory of Operation A.1.1 Temperature Probes Model 986 thermometers are configured at the factory for Oral/Axillary or Rectal probe types. The probe type is configured at the factory by the absence or presence of the MODE jumpers JP1 through JP4. -
Page 37: Power Supply
Appendix A. Theory of Operation The shape of the rising temperature curve is monitored and the best fit to a curve is found. When the curve fit is stable, the final predicted temperature is displayed. If the prediction criteria explained above are not met within 15 seconds of starting the prediction process, the instrument will automatically switch to Monitor mode. -
Page 38: Microprocessor Clock
Appendix A. Theory of Operation When the reset signal is complete, the microprocessor launches a series of self-checks, which include RAM, probe warmer circuitry, probe, battery voltage, and ambient temperature tests. Any failures will cause a specific error code to be displayed. A.1.7 Microprocessor Clock The clock for the microprocessor is generated by X1 and capacitors C26 and C27, which form a 2.4576 MHz. -
Page 39: Circuit Description
Appendix A. Theory of Operation The time constant is measured by counting the time it takes for the voltage to decay from a fixed initial voltage level to a fixed lower voltage. The ratio of this pulse width and the pulse width corresponding to a known calibration resistance (R13, 11.55K) is used to calculate the measured resistance. -
Page 40: Probe Type Detection
Appendix A. Theory of Operation A.2.4 Probe Type Detection Upon power reset, the thermometer performs a probe test. Probe type is first detected and then, if it is an oral probe, its warming characteristics are determined. Rectal probes are not warmed, so warming characteristics are not tested on these probes. -
Page 41: Probe Warming (Oral Probes Only)
Appendix A. Theory of Operation A.3 Probe warming (Oral probes only) The probe warmer circuitry is used to heat the probe tip prior to taking a temperature reading in order to speed the convergence of the prediction algorithm. This allows quicker temperature readings. A fail-safe hardware shutoff circuit is included to ensure the heater will shut off in the event of a software failure. -
Page 42: Liquid Crystal Display
Appendix A. Theory of Operation Q13 and Q14 are selected for their low saturation on voltage. D1 is a diode clamp used to keep the base of Q5 from attaining a much higher voltage than VCC. R4 (47K) and R2 (4.7K) in combination with R3 (47K) serve as pull-down resistors, ensuring that the processor feedback lines (U1-43 and U1-44) go low immediately upon warmer component shutoff. -
Page 43: Horn
Appendix A. Theory of Operation A.3.6 Horn The horn is activated at the start of a temperature taking cycle, at the end of a Normal mode temperature cycle, and for various error conditions. • A short duration high pitch single beep indicates normal operation. - Page 44 Appendix A. Theory of Operation 70995-0000B M986...
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Page 45: Appendix B. Specifications
Appendix B. Specifications Dimensions (nominal) 2.3 in. W, 6.6 in. H, 1.9 in D 5.8 cm W, 16.8 cm. H, 4.8 cm. D (with probe cover storage) Case Material ABS Plastic. Weight (nominal) 6.0 ounces (171 grams). Ambient Temperature 9.0° C to 40.0° C (48.2° F to 104.0° F). Range Patient Temperature Oral/Axillary... - Page 46 Appendix B. Specifications 70995-0000B M986...
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Page 47: Appendix C. Limited Warranty
Welch Allyn. Loss or damage in shipment shall be at purchaser's risk. Welch Allyn will not be responsible for loss associated with the use of any Welch Allyn product that (1) has had the serial number... - Page 48 Appendix C. Limited Warranty 70995-0000B M986...
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Page 49: Appendix D. Wiring Diagram
TEST PORT 22 50V PROBE TEST GND_DIGITAL /CTS ON/OFF 2.4576Mz /RTS MODE RES2 MMBD1203 /HOST_WAKEUP HOUT /TxD 2 AAA /RxD RCAL_SEL 100k Batteries /CTS 22 50V 1uF/50V /RTS CON5 /RESET /RESET CON10 0.1uF/50V VREF ON/OFF VREF MODE 0.1uF/50V /HOST_WAKEUP /TEST_MODE 4.7k 0.01uF TLOW... - Page 50 Welch Allyn, Inc. 7420 Carroll Road San Diego, CA 92121 (800) 535-6663...