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Summary of Contents for Welch Allyn 711
- Page 1 Diagnostics Instruments Operator Manual Service Manual 711 UNIVERSAL DESK CHARGER Welch Allyn Medical Division 4341 State Street Road P.O. Box 220 Skaneateles Falls, NY 13153-0220 711380 Rev. D Copyright 2001...
- Page 2 Drawings and/or illustrations and/or part numbers contained in this document are for reference purposes only. For current revisions call the Welch Allyn Customer Service phone number listed in Section 1 page 3. WELCH ALLYN UNIVERSAL DESK CHARGER i SERVICE MANUAL 711380 REV. D...
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Page 3: Table Of Contents
4.1.1 Base Housing Removal/Installation ................7 4.1.2 Printed Circuit Board Replacement ................7 4.1.3 Fuse Replacement ....................8 Appendix A: Theory of Operation....................9 Appendix B: Assembly Drawing....................13 Appendix C: Electrical Schematic..................14 SERVICE MANUAL 711380 REV. D ii WELCH ALLYN UNIVERSAL DESK CHARGER... -
Page 4: Section 1: General Information 1.1 About The Universal Desk Charger
1.1 About the 711 to provide a safe (if not optimal) trickle charge profile for Universal Charger all Welch Allyn handles. It is intended to replace the 71110 Desk Charger. However, the major improvements over the 71110 that directly affect the electrical design... -
Page 5: Hardware Electrical Specifications
Power Consumption ):10W Max (high line PCB (Full Load resistor, transistor, LED, and LM317 at max Load) Power Dissipation: Internally Limited to 17W loss (Assumes full transformer at dual short circuit) WELCH ALLYN UNIVERSAL DESK CHARGER SERVICE MANUAL 711380 REV. D... -
Page 6: Help Information
Year 2000 Information: The Universal Charger is Y2K compliant and will not encounter “Year 2000” problem 1.5 Product Model Number Structure 71140 US, Canada, Japan Version 71142 European Version 71144 United Kingdom Version 71146 Australian Version WELCH ALLYN UNIVERSAL DESK CHARGER 3 SERVICE MANUAL 711380 REV. D... -
Page 7: Safety Warnings
As a precaution, avoid using this device in close proximity to other equip- ment. See User Manual or call Welch Allyn for the most current approvals. UL 2601-1, CAN/CSA 1.7 Approvals C22.2 No 601.1, IEC... -
Page 8: Incoming Inspection/Checklist
Incoming green LED light illuminates. Operational Test With main power applied, insert any Welch Allyn nicad handle into one of the charging wells and ensure that the amber charge LED under that well lights. Repeat the test on the opposite charging well. -
Page 9: Section 3: Troubleshooting 3.1 Functional Tests/ Initial Diagnostic Steps
Check Fuses If fuses are OK, then replace printed circuit board. 3.1.2 Amber charge LED not on. Insert a Welch Allyn rechargeable handle in charging well or T17814 repair test handle. If the amber charge light still does not come on, then replace printed circuit board. -
Page 10: Section 4: Repair And Disassembly
Make sure LEDs and IEC connectors are lined up with their respective slots in the cover housing. Reinstall base housing as described above. WELCH ALLYN UNIVERSAL DESK CHARGER 7 SERVICE MANUAL 711380 REV. D... -
Page 11: Fuse Replacement
PCB. Insert the new fuses into the brackets on the IEC connector. Reinstall the PCB as described above. Reinstall the base housing as described as above. WELCH ALLYN UNIVERSAL DESK CHARGER SERVICE MANUAL 711380 REV. D... -
Page 12: Appendix A: Theory Of Operation
(In the case of the LM317, the set voltage is nominally 1.25V.) This condition gets satisfied when the output current approaches 1.25V/Rlimit. Therefore, simply picking the correct resistor value can choose any desired current . WELCH ALLYN UNIVERSAL DESK CHARGER 9 SERVICE MANUAL 711380 REV. D... - Page 13 This limits the current through the Zener diode when the circuit is in Voltage limit mode. WELCH ALLYN UNIVERSAL DESK CHARGER SERVICE MANUAL 711380 REV. D...
- Page 14 DC voltage, the corresponding diode will forward conduct, and the pass transistor will not be biased (and the green “power on” LED’s will be shut off). WELCH ALLYN UNIVERSAL DESK CHARGER 11 SERVICE MANUAL 711380 REV. D...
- Page 15 Since the yellow LED receives its power on the high side of the battery charger sense resistor, the LED current does not affect the current limit to the battery. WELCH ALLYN UNIVERSAL DESK CHARGER SERVICE MANUAL 711380 REV. D...
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Page 16: Appendix B: Assembly Drawing
495083 RUBBER FEET 711074 MDL LABEL,711 SERIES,DESK CHGR 106124-48 SCREW,#8 PLASTITE,.625L,PH 236706-3107 FUSE- INTERNATIONAL 761076-0 POWER CORD, DETACH.(DOM/JAPAN) 761076-2 POWER CORD-DETACH (EUROPEAN) 761076-4 POWER CORD-DETCHBL (U.K) 761076-6 POWER CORD DETACH (AUSTRALIA) SERVICE MANUAL 711380 WELCH ALLYN UNIVERSAL DESK CHARGER 13... -
Page 17: Appendix C: Electrical Schematic
W elch A llyn P D L 1 -9 -0 1 THESE DRAWINGS AND SPECIFICATIONS ARE THE PROPERTY OF WELCH ALLYN, INC. D AT E A P PR O VE D AND SHALL NOT BE REPRODUCED, OR COPIED, OR USED AS A BASIS FOR SALE OR... - Page 18 D ATE W elch Allyn P D L 1-9-01 THESE DRAWINGS AND SPECIFICATIONS ARE THE PROPERTY OF WELCH ALLYN, INC. D ATE AP PR O VED AND SHALL NOT BE REPRODUCED, OR COPIED, OR USED AS A BASIS FOR SALE OR...
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