Related Manuals for Welch Allyn 9000
Summary of Contents for Welch Allyn 9000
- Page 1 Thermo Menu 9000 Operation Manual 9020 Operation Manual Model 9000 and Model 9020 Infrared Thermometer Technical Manual...
- Page 2 R e p u b l i c o f I r e l a n d © 1997 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.
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Page 3: Table Of Contents
Internal A/D Calibration Circuit ....................19 Calibration Check Circuit....................... 19 Thermometer Wakeup ......................19 IR Temperature Measurement Cycle ..................20 HORN CIRCUIT........................20 BACKLIGHT CIRCUIT ......................21 Wall Mount Security Switch (Model 9000 Only)..............21 THEORY OF OPERATION (MECHANICAL)................21... - Page 4 Welch Allyn Model 9000/Model 9020 MODEL 9000 CALIBRATION CHECK & ADJUSTMENT ............22 MODEL 9020 CALIBRATION CHECK & ADJUSTMENT ............25 FACTORY SERVICEABLE ONLY REPAIRS ................27 FIELD SERVICEABLE REPAIRS..................... 27 FIELD SERVICEABLE PARTS LIST ..................28 SUGGESTED SPARE PARTS (PER 100 UNITS)..............31 OPTIONS &...
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Page 5: Introduction
INTRODUCTION This manual provides technical information about the electronic and mechanical operation of the Welch Allyn Model 9000 series infrared thermometers. It is intended for use by trained service representatives. This manual is applicable for Model 9000 thermometers with serial numbers equal to and greater than 5262151 and for Model 9020 thermometers with serial numbers equal to and greater than 4160001. -
Page 6: Changing The Probe Cover Dispenser
Welch Allyn Model 9000/Model 9020 Changing the Probe Cover Dispenser The thermometer handle will not slide if a dispenser is not installed or if it is empty. A vertical window in the handle of the thermometer allows you to see when the probe cover dispenser is empty. -
Page 7: Cleaning The Thermometer
Technical Manual CLEANING THE THERMOMETER Routine Cleaning Clean the exterior of both the thermometer and the wall mount as needed. Wipe all surfaces with a clean cloth, dampened with warm water and a mild detergent or germicidal cleaner (see the table below for acceptable cleaning agents). •... -
Page 8: Cleaning The Probe Sensor Lens
Before use, allow the thermometer to stabilize to room temperature for at least one hour, then verify calibration using a Welch Allyn Model 9600 Calibration Tester Cleaning the Probe Sensor Lens Dust and other minute particles of environmental debris can build up on the probe sensor lens during normal use of the thermometer. -
Page 9: Method 2: Removing Smudges Or Excessive Debris
Technical Manual Method 2: Removing Smudges or Excessive Debris (RECOMMENDED AS NEEDED OR IF LOW TEMPERATURE READINGS PERSIST AFTER METHOD #1) MATERIALS NEEDED • Isopropyl Alcohol • Cotton Swab Advance the slide to extend the probe tip. Manually remove the probe cover to expose the probe sensor lens. Using a cotton swab slightly moistened with isopropyl alcohol, gently wipe the surface of the lens to remove debris (Figure D). -
Page 10: Changing The Probe Tip
Periodically inspect the plastic probe tip for nicks or other damage, and replace if necessary. MATERIALS NEEDED Probe Tip Replacement Kit (Welch Allyn Part #20688-000) Advance the slide to extend the probe tip. Manually remove the probe cover to expose the probe tip. - Page 11 Replace the battery compartment door, then reinstall the screw to secure the door (Figure F). Note that the Model 9000 will be in a security time-out condition when the Theft Protection System is enabled (“SEC” will appear on the display). Return the thermometer to the wall mount to reset the security timer, and resume normal operation.
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Page 12: Theft Protection System
Once in a security time-out condition, when any button is pressed, “SEC” is displayed and the Model 9000 beeps rapidly to indicate a security status. After the 9000 is returned to the wall mount, the security timer is reset and the thermometer is ready for use. - Page 13 When the number of hours desired for security time-out is displayed, retract the probe and return the thermometer to the wall mount. The Model 9000 will automatically perform a diagnostic self-test of the electronics (indicated by a segment cycling through the display). Once this test is complete,...
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Page 14: Troubleshooting
Welch Allyn Model 9000/Model 9020 TROUBLESHOOTING PROBLEM SOLUTION Low Temperatures Debris on probe sensor lens. Clean lens. See “Maintenance” section of this manual for procedure Improper technique–refer to the Users’ Manual. Insert probe snugly into ear, completely closing off ear canal.. - Page 15 Improper operating condition. Check display for error status. See “Error Codes” section of this manual for explanation. “SEC” Displayed 9000 locked in security time-out condition. Return thermometer to wall mount to reset Theft Protection timer, then resume normal operation. Blank LCD Display Probe extended for over 5 minutes.
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Page 16: Error Codes
Welch Allyn Model 9000/Model 9020 ERROR CODES When the thermometer detects an improper operating condition, the malfunction symbol (X) will appear with one of the numeric error codes (Er) below. Set the thermometer aside for one hour to allow the electronics to stabilize to room temperature. -
Page 17: Thermometer Disassembly
Technical Manual ERROR EXPLANATION Sensor resistance pulse width exceeding 95 milliseconds. Ambient temperature is above 110°F. If not, thermometer requires service. Thermistor reference pulse width exceeding 95 milliseconds. Check thermistor reference circuit. If not, thermometer requires service. Hical pulse width exceeding 95 milliseconds. Check probe switch circuit including 4-conductor flex cable. -
Page 18: Thermometer Reassembly
Welch Allyn Model 9000/Model 9020 can then be removed by lifting slightly on the front edge of the analog circuit board to allow the assembly to be lifted out. The entire electronics assembly may be removed by gently lifting the display and... -
Page 19: Theory Of Operation (Electrical)
Technical Manual 12. Install the right case half (7) applying gentle pressure until the two case halves are together. If the case does not close completely, carefully remove the right half and check the position of the PCB’s, battery contacts, cables, and reference arm tabs. 13. -
Page 20: Microprocessor Clocks
EEPROM are set high by the microprocessor when the EEPROM is not being read. Analog IC U1 U1 is a Welch Allyn custom bipolar IC which contains a 1.2 and 2.4 volt reference, a low battery detector, and circuits associated with performing the A/D converter function. -
Page 21: A/D Converter Circuit
Technical Manual A/D Converter Circuit Op amp U2 and capacitor C6 form an integrator which converts signal input currents into a variable length ramp at U2-6 which starts at approximately 2.4 volts and ends at 1.2 volts. The time required for the ramp to progress from the higher to lower voltage is measured by the microprocessor. -
Page 22: Ir Temperature Measurement Cycle
Welch Allyn Model 9000/Model 9020 IR Temperature Measurement Cycle The following sequence occurs when the thermometer has just been activated following removal from the security wall mount or upon completing a temperature taking cycle. The infrared sensor is exposed to the reference arm while the slide handle is retracted to allow calibration to take place. -
Page 23: Backlight Circuit
150 volts P-P and 700 Hertz frequency which drives the electroluminescent backlight panel DS2. Wall Mount Security Switch (Model 9000 Only) The reed switch, S7, is normally open when the thermometer is away from the security wall mount. When the thermometer is placed into the security wall mount, a magnet located inside the wall mount closes S7 which is sensed by the microprocessor (U4-35) which then shuts down all thermometer circuits. -
Page 24: Model 9000 Calibration Check & Adjustment
MODEL 9000 CALIBRATION CHECK & ADJUSTMENT It is recommended that the thermometer be checked for proper calibration every six months. The calibration of the thermometer may be verified by using the Welch Allyn 9600 Calibration Tester. The following procedure allows for manual calibration adjustments of a Welch Allyn Model 9000 Series Thermometer which has failed the Troubleshooting Test described in the 9600 manual. - Page 25 Technical Manual Setting the Thermometer to the calibration adjustment mode Insert the thermometer into a wall mount. Move the slide forward and then press the scan switch and activate the mode switch simultaneously. Remove the thermometer from the wall mount and retract the slide. Move the slide forward and activate the mode switch before display test ends .
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Page 26: Model 9020 Calibration Check & Adjustment
Welch Allyn Model 9000/Model 9020 MODEL 9020 CALIBRATION CHECK & ADJUSTMENT It is recommended that the thermometer be checked for proper calibration every six months. The calibration of the Model 9020 may be verified by using a Diatek Model 9600 Calibration Tester. The following procedure allows for manual calibration adjustments of the Diatek Model 9020 Thermometer to correct for minor calibration deviations. - Page 27 Technical Manual Setting the Thermometer to the calibration adjustment mode 1. Open the battery compartment and remove 1 battery. 2. Press and release the Scan Switch. Re-install the battery. The display will start a segment self test. 3. Move the probe cover loading slide handle forward and press the MODE switch before the segment test ends.
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Page 28: Factory Serviceable Only Repairs
ALL PLASTIC COMPONENTS (case, gear, slide, and LCD window) ALL SWITCHES ALL FLEX CABLES ALL CAPACITORS ALL RESISTORS REFERENCE ASSEMBLY DS1, DS2, LS1, Q1, Q2, T1, U4 Refer to the following Field Servicable Parts List for a comprehensive list of Welch Allyn part numbers. -
Page 29: Field Serviceable Parts List
FLEX CABLE-2 CONDUCTOR 80085-000 FLEX CABLE-4 CONDUCTOR 80125-0000 FLEX CABLE-22 CONDUCTOR 80124-0000 RESISTOR, 18.2K 1% 0805 40311-8220 LABEL SET-STANDARD MODEL 9000 70371-110 LABEL SET-MODEL 9000 - MEDIMEX 70371-300 (GERMAN) LABEL SET-MODEL 9000 - IMEDA 70371-400 (FRENCH) LABEL SET-MODEL 9020 70371-500... - Page 30 PROBE SWITCH 58323-000 BACKLIGHT TRANSFORMER (MODEL 52012-000 9000) THERMISTOR REFERENCE ARM 20447-020 R11-R13, R15-R17, RESISTOR, 100K 5% 0805 40290-1040 R19, R21, R22, DISPOSABLE WINDOW 25155-010 LABEL SET, SECURITY-MODEL 9000 - 70565-010 ENGLISH LABEL SET, SECURITY- MODEL 9000 - 70565-310 GERMAN...
- Page 31 ACTUATING LEVER 25192-000 CAPACITOR, 0.068MF 63V 5% 46125-0000 REED SWITCH 58455-000 CRYSTAL, 32 KHz 47006-0000 RESONATOR, 6MHz 47017-000 Item numbers are part of subassemblies, not referenced directly on drawing. ** These items are included under one Welch Allyn part number, 20694-020.
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Page 32: Suggested Spare Parts (Per 100 Units)
REED SWITCH 60019-000 ELECTROLUMINESCENT LAMP, MODEL 9000 ONLY 60020-000 70371-110 LABEL SET-STANDARD MODEL 9000 70371-300 LABEL SET-MODEL 9000 - MEDIMEX (GERMAN) 70371-400 LABEL SET-MODEL 9000 - IMEDA (FRENCH) 70371-500 LABEL SET-MODEL 9020 80125-0000 4 CONDUCTOR FLEX CABLE 85217-000 LEVER ARM SPRING... -
Page 33: Options & Accessories
OPTIONS & ACCESSORIES Welch Allyn 050 Probe Covers Welch Allyn Part #05051 Box of 2 dispensers (100 probe covers/dispenser) Packaged in quantities of 1,000 (Welch Allyn direct customers only) and 5,000 probe covers/carton Probe Tip Replacement Kit Welch Allyn Part #20688-000... - Page 34 Welch Allyn Model 9000/Model 9020 Figure G: Thermometer Assembly...
- Page 35 Technical Manual Figure H: Left Case Component Locations Figure I: Left Case Component Locations Prior to Final Assembly...
- Page 36 Welch Allyn Model 9000/Model 9020 Figure J: Block Diagram and Signal Flow...
- Page 37 Technical Manual Figure K: PCB/Components...
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Page 40: Limited Warranty - Model 9000
(the “Product”) is free from defects in material and workmanship under normal use and service for a period of three years from the date of first shipment from Welch Allyn and one year for refurbished units. This Warranty shall be fulfilled by the repair or replacement by Welch Allyn or its authorized representative, at Welch Allyn’s discretion of any such defect, free of charge... -
Page 41: Limited Warranty - Model 9020
Product at Customer’s own expense to Welch Allyn, 7420 Carroll Road, San Diego, CA 92121. Any risk of loss or damage in shipment of the Product to Welch Allyn shall be borne exclusively by Customer. Repair or replacement will be made at Welch Allyn’s expense subject to the terms of this Warranty. - Page 42 7420 Carroll Road, San Diego, CA • (619) 621-6600 • (800) 854-2904 • FAX (619) 621-6610 70591-100A...