Welch Allyn VideoPath VLX-10 Service Manual
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Welch Allyn VideoPath VLX-10 Service Manual

Welch Allyn VideoPath VLX-10 Service Manual

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VideoPath VLX-10 & VLX-20
TM
Light Source
Light Source Menu
Service Manual
VLX10 Operation Manual
VLX20 Operation Manual
Part No. 455007
Rev. B

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Summary of Contents for Welch Allyn VideoPath VLX-10

  • Page 1 VideoPath VLX-10 & VLX-20 Light Source Light Source Menu Service Manual VLX10 Operation Manual VLX20 Operation Manual Part No. 455007 Rev. B...
  • Page 2 Rev. Description of Change ECN # Date Initiator New Release S-33314 8/7/96 M Dahlin Update section 3 & dwg Rev's S-33896 10/18/96 M Dahlin         ...

  • Page 3: To Service Personnel

    The information in this manual is subject to change without notice and should not be construed as a commitment by Welch Allyn, Inc. Welch Allyn assumes no responsibility for any errors that may appear in this manual. If the product and/or its operation varies significantly from any...

  • Page 4: Limited Warranty

    Welch Allyn or an authorized agent. Welch Allyn will either repair or replace any components found to be defective or at variance from manufacturer's specifications within this time at no cost to the customer.

  • Page 5: Table Of Contents

    Table of Contents Rev. SECTION 1: General Information Basic System Description ... . 1 Major Component Description (Light Box) 2 Specifications ..... 4 System Symbol Descriptions .
  • Page 6 Table of Illustrations Description Section Page Figure 1-1: Light Box Panels (Front & Rear) ..Figure 4-1: Servo Plate & IR Filter Assembly ..Figure 4-2: IR Filter View ......Figure 4-3: Hypertronics Assembly .
  • Page 7 Table of Drawings (Appendix A) Drawing # Description Rev Level Parts List/Recommended Inventory ..D405049 VLX-10 Interconnect Diagram (Reference) . D455059 VLX-20 Interconnect Diagram ... 405000 VLX-10 Light Source .

  • Page 8: Section 1 General Information

    The power supply/light source provides the light, air, and video pass through for the system. The light is provided by two patented Welch Allyn arc lamps. Rated at 21 watts, these generate the same output as a high wattage Xenon arc lamp while only producing a fraction of the heat.

  • Page 9: Major Component Description: Light Box

    Section 1 General Information Major Component Description: Light Box The VideoPath VLX-10/20 Light Source is driven by a universal switching power supply, which accepts 100-240 VAC, 50-60 Hz without having to be adjusted. This power supply automatically senses line voltage and makes the correct adjustments for any line input. The power supply is medical grade and is approved for medical standards by UL, CSA, and TUV.
  • Page 10 Section 1 General Information Figure 1-1: Light Box Panels, Front and Rear         Rev. A      ...

  • Page 11: Specifications

    Compatible Endoscopes Welch Allyn Video Endoscopes ..... . . Color CCD Only Other Manufacturer's Fiber Scopes ....All with Video Adaptor         Rev.
  • Page 12 Lamp Voltage ..........60V Welch Allyn PN 04060         Rev.

  • Page 13: System Symbol Descriptions

    Section 1 General Information SYSTEM SYMBOL DESCRIPTIONS Attention. Read Operating Manual for Warnings, Precautions, and Instructions for Use. Potential Equalization Stud Type BF Equipment Warning: Risk of Fire. Replace Fuses as Marked. Lamp Standby Picture Brightness Dangerous Voltage         Rev. A      "...

  • Page 14: Section 2: Service

    Service Intent of Manual The purpose of this manual is to provide Welch Allyn Inc. authorized service representatives with systematic guidelines for preventative maintenance, problem identification, and service of the VideoPath VLX-10/20 Light Source. We have included the theory of operation schematic diagrams, simplified drawings, service tips and procedures to assist a trained service representative with board-level repairs.

  • Page 15: Words Of Caution

    When removing an assembly, pay attention to the wire and connector positions in order to facilitate prompt reassembly. VideoPath VLX-10/20 Light Source Service Manual Rev. A Service Section 2 - Page 2...

  • Page 16: Performance Check

    LED will continually blink. No other activity will take place. If any of these conditions do not occur, see the troubleshooting section. VideoPath VLX-10/20 Light Source Service Manual Rev. A Service Section 2 - Page 3...

  • Page 17: Calibration

    S-video cable to the proper output terminal. With distal end of the scope focused on a functional viewing scene (ie: cupped hand) view monitor for a quality picture. Calibrations Not Applicable VideoPath VLX-10/20 Light Source Service Manual Rev. A Service Section 2 - Page 4...

  • Page 18: Section 3: Problem Solving

    When checking voltages or signals, be sure to verify signal through the harness wires, connectors, and on the circuit board. Reference numbers in parentheses, such as (A5), refer to the Interconnect Diagram located in APPENDIX A. VideoPath VLX-10/20 Light Source Service Manual Rev. B Problem Solving...
  • Page 19 (with a good Ballast board) will actuate when a lamps voltage reaches 66.8VDC or greater (An indication of potential lamp failure). Refer to Interconnect Diagram VideoPath VLX-10/20 Light Source Service Manual Rev. B Problem Solving Section 3 - Page 2...
  • Page 20 Clogged or defective Verify and correct as scope module. necessary. Consult User Manual or factory if unable to correct. Refer to Interconnect Diagram VideoPath VLX-10/20 Light Source Service Manual Rev. B Problem Solving Section 3 - Page 3...
  • Page 21 Verify DC output at J2. If not present or fuse is again blown, replace Switching Power supply (A1). Refer to Interconnect Diagram VideoPath VLX-10/20 Light Source Service Manual Rev. B Problem Solving Section 3 - Page 4...

  • Page 22: Section 3 - Page 5

    J202 of DC to DC (A2) Converter Power Supply (A2) and input voltages at J7 and J9 of Light Control Board (A3). Refer to Interconnect Diagram VideoPath VLX-10/20 Light Source Service Manual Rev. B Problem Solving Section 3 - Page 5...
  • Page 23 Verify proper light source interference. grounds. Inspect Hypertronics connector and ribbon connectors. Replace as necessary. Defective Endoscope. Verify with a known good Endoscope. Refer to Interconnect Diagram VideoPath VLX-10/20 Light Source Service Manual Rev. B Problem Solving Section 3 - Page 6...
  • Page 24 Lightly tap internal connections while observing image on monitor. Defective Attenuator Verify light vane Assembly. articulation and proper motor function. Replace as necessary. Refer to Interconnect Diagram VideoPath VLX-10/20 Light Source Service Manual Rev. B Problem Solving Section 3 - Page 7...
  • Page 25 Verify condition of hypertronics connector (Pin 9) for broken or bent pins. Replace as necessary. Defective scope. Verify by replacing with a known good scope. VideoPath VLX-10/20 Light Source Service Manual Rev. B Problem Solving Section 3 - Page 8...
  • Page 26 VLX-20 RGB Red output RGB Ground J2/J3 ground Y-VID Y-video signal out C-VID C-video signal out J4/J6 Composite video out ground Refer to Interconnect Diagram VideoPath VLX-10/20 Light Source Service Manual Rev. B Problem Solving Section 3 - Page 9...
  • Page 27 -12V -12V +12V +12V J9 Power +8.5V +8.5V from A2 ground -12V -12V +7.4V +7.4V Receive data in (Serial image capture data from scope). Ground VideoPath VLX-10/20 Light Source Service Manual Rev. B Problem Solving Section 3 - Page 10...
  • Page 28 Connector Name Description Ballast (A8) Service +15V +15V from Power Supply (A1) note: Inductor L between (A1) and (A8) ground Refer to Interconnect Diagram VideoPath VLX-10/20 Light Source Service Manual Rev. B Problem Solving Section 3 - Page 11...
  • Page 29 Output B OUTD Output D OUTF Output F Data terminal ready Ring indicator OUTC Output C OUTE Output E OUTG Output G Refer to Interconnect Diagram VideoPath VLX-10/20 Light Source Service Manual Rev. B Problem Solving Section 3 - Page 12...

  • Page 30: Section 4: Disassembly And Repair

    VLX-10 Light Source drawing numbers when describing the disassembly and repair in detail. Refer to the appropriate drawing as necessary when servicing the VLX-10 or VLX- VideoPath VLX-10/20 Light Source Service Manual Rev. A Disassembly and Repair...
  • Page 31 Remove the light control board by removing the four screws (405015 #14), and the wire harnesses (Note location for reassembly). Reassemble in reverse order noting the location of the wire harnesses using interconnect diagram 405059. Torque all hardware per appropriate drawing. VideoPath VLX-10/20 Light Source Service Manual Rev. A Disassembly and Repair Section 4 -Page 2...
  • Page 32 50° C for 1.5 hours or at room temperature for 12 hours. Figure 4.1 Reassemble in reverse order. Torque the two Hex Head screws (405015 #11) per drawing 405015. VideoPath VLX-10/20 Light Source Service Manual Rev. A Disassembly and Repair Section 4 -Page 3...
  • Page 33 Torque per drawing 405013. Reassemble in reverse order. Note torque specs per drawings 405015 and 405013. Figure 4.3 VideoPath VLX-10/20 Light Source Service Manual Rev. A Disassembly and Repair Section 4 -Page 4...

  • Page 34: Gearhead Motor

    (455220 #4). Reassemble the light attenuator assembly as follows: Acquire a new motor (455220 #7) and reassemble the motor clip (455220 #7). Gearhead Motor Figure 4.4 VideoPath VLX-10/20 Light Source Service Manual Rev. A Disassembly and Repair Section 4 -Page 5...
  • Page 35 Reassemble light attenuator assembly and light source in reverse order. Torque the two Hex Head screws (405015 #11) to 24 IN. Position of Spring Figure 4.7 LBS. Figure 4.8 VideoPath VLX-10/20 Light Source Service Manual Rev. A Disassembly and Repair Section 4 -Page 6...

  • Page 36: Ballast Board

    Remove the 4 screws (405050 #31) securing the power supply (405050 #6) to the base (405050 #1). Remove the input and output wire harnesses and replace. Reassemble in reverse order. Note torque specs per appropriate drawing. VideoPath VLX-10/20 Light Source Service Manual Rev. A Disassembly and Repair...

  • Page 37: Section 5: Maintenance

    Preventative Maintenance The purpose of preventative maintenance is to pro-actively reduce or eliminate future problems. Keeping the VideoPath VLX-10/20 Light Source in good operating condition ensures that it will perform reliably and safely. Every six to twelve months, you should: * check all video and power cables for wear.

  • Page 38: Checking Ground Impedance

    Section 5 Maintenance CLEANING Refer to Operating Manual, Welch Allyn Part Number 405071. Check Ground Impedance Disconnect the power cord from the VLX-10/20. Connect an ohmmeter (measuring at milli-ohms) between ground terminal of the appliance inlet receptacle and the outside of the Composite Video Output (BNC) connector on the rear panel.
  • Page 39 If this value exceeds 100 microamps (or whatever the maximum requirements are for a particular region), an isolation transformer should be used. Figure 5-1: Typical Current Leakage Test Set-Up VideoPath VLX-10/20 Light Source Service Manual Rev. A Maintenance...

  • Page 40: Fuse Or Lamp Replacement

    Secure lamp assembly in place, tighten screw. Slide black connector on to lamp. Secure lamp door. Reconnect system to verify lamp operation and power interlock switch is closed. VideoPath VLX-10/20 Light Source Service Manual Rev. A Maintenance Section 5 - Page 4...

  • Page 41: Theory Of Operation

    2%, with peak-to-peak noise of 150mV. The output is fully protected against short circuit and output overload. Short circuit protection is a cycling type power limit with automatic recovery after fault. VideoPath VLX-10/20 Light Source Service Manual Rev. A Theory of Operations...
  • Page 42 S1 and S3 are connected to port B bits 5 and 7 (pins 11 and 13) respectively. They allow the user to increase and the camera exposure and are active whenever the sigmoidoscope is inserted. VideoPath VLX-10/20 Light Source Service Manual Rev. A Theory of Operations...

  • Page 43: Light Control Board

    Video is the combination of Y and C signals. Ballast Board The ballast boards are a power supply used to operate the 21 watt Welch Allyn miniature arc lamps. The nature of arc lamps require a ballast which limits the current, and therefore the power, in the lamp.
  • Page 44 Parts List / Recommended Inventory VLX-10 PARENT VLX-10 VLX-20 PARENT VLX-20 ASSEMBLY DRAWING ASSEMBLY DRAWING INTER REC. NUMBER NUMBER NUMBER NUMBER CONNECT DESCRIPTION PART NUMBER QTY INV. 405000-501N 405000 455000-501N 455000 COVER SCREWS 451565-1 405000-501N 405000 455000-501N 455000 LIGHT CONTROL PANEL LABEL 455503 405000-501N 405000...

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Videopath vlx-20

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