Welch Allyn Colposcope User manual
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Drawings and/or illustrations and/or part numbers contained in this document
are for reference purposes only. For current revisions call Welch Allyn
Customer Service listed in appendix D of this manual.
SERVICE MANUAL 880325 REV. A
WELCH ALLYN VIDEO COLPOSCOPE (Introduced 12/00) i
Contents page
Section 1: General Information (See Users Manual for Product Description, Set Up and Use)
1.1 About the Video Colposcope and Users Manual Part Number.... .. .. .......................... 1
1.2 Technical Help Information, Worldwide Tech Support Contact Information ............... 2
1.3 Basic System Graphic Fig.1....................................................................................... 3
1.4 Product Model Number Structure T able...................................................................... 4
Section 2: Service (See User Manual for Cleaning Instructions and Specifications)
2.1 Incoming Inspection .................................................................................................... 1
2.2 Tools Required for Service ......................................................................................... 5
Section 3: Troubleshooting
3.1 Troubleshooting Table................................................................................................. 1
Section 4: Disassembly and Repair
4.1 Stand Alone Colposcope Disassembly..................................................................1-10
Appendix Section:
A................................................................................................................ repair parts listing
B............................................................................... interconnect diagrams and schematics
C......................................................................................................................parts drawings
D....................................................Welch Allyn International Product Service Center Listing
ii WELCH ALLYN VIDEO COLPOSCOPE (Introduced 12/00)
SERVICE MANUAL 880325 REV. A
Section 1 - General Information
The Video Colposcope introduced December 2000
has an internal light source like its predecessor .
The new version has additional features:
1 - an antireflection system of two polarizing filters.
2 - a magnification system of up to 35x and the
ability to view the magnification index on the
monitor during procedures.
3- a faster green filter
This Service Manual covers the ‘head’ or actual Col-
poscope only and not the poles and power supplies.
Electrical Interconnect diagrams are found in the
Appendix section to assist with troubleshooting the
pole mounted power supplies and both versions of
the Colposcope.
Refer to the Colposcope Users Manual for instructions on use and cleaning. (Domestic manual part
880324 and international manual part 880332).
1.1 About the Video
Colposcope
(Introduced December
2000)
A Colposcope Quick Reference Guide (part 880331)
is also available.
Service Manual 880325 Rev . A
Welch Allyn Video Colposcope 1
Section 1 - General Information
1.2
Help Information
Safety Warnings
All service and repairs must be performed by fully trained
and properly equipped personnel, using genuine
replacement parts and correct procedures. Failure to do
so will invalidate the product warranty.
Read and understand all safety warnings and
service notes printed in the Colposcope Users
Manual (part 880324) or the Colposcope Quick
Reference Guide (part 880331).
These documents contain complete descriptions of
features, use, cleaning and hook up. If in doubt
about any precaution or procedure, for phone help,
or to order additional copies of the documentation
contact a Welch Allyn Product Service Center as
listed in Appendix D.
2 Welch Allyn Video Colposcope
Service Manual 880325 Rev. A
Section 1 - General Information
1.3 Basic System Description
The Stand Alone version is not a Video Path product and does not require a light
source. It is a camera and light source in one compact housing mounted on either a
vertical pole stand or a swing arm stand as shown in Figure 1. The table on Page 1-5
is a list of product numbers and repair bill numbers. It also lists the product numbers
for the camera units only .
Service Manual 880325 Rev. A
Figure 1
Welch Allyn Video Colposcope 3
Section 1 - General Information
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4 Welch Allyn Video Colposcope
Service Manual 880325 Rev . A
Section 2 - Service
2.1 Incoming Inspection of Colposcopes
2.1.1 Perform physical examination of returned colposcope and accessory cables,
cords etc.
2.1.2 Make record of what components were received. Note serial numbers
where applicable.
2.1.3 Check the physical and electrical condition of all items including S-video
cables, power cords, RS232 cables, all pins and sockets.
2.1.4 Check the lamp connector. The lamp has a small and a large pin. Make
sure the lamp socket has not been ruined by someone connecting the
connector in reverse. This would damage the connector and make lamp
operation intermittent. Connectors must fit lamp pins securely .
2.1.5 Check Electrical, Optical, and Mechanical functions:
1) Lamp operation
2) Fan operation
3) Lamp door micro switch safety function. Try to run unit without lamp
door. If lamp lights, then micro switch(s) are stuck or defective.
4) Colposcope attachment to pole or swing arm.
5) Colposcope functions...allow approximately 10 seconds for the camera
unit to stabilize and focus. The camera will stabilize at zoom (-).
6) Focus: Check focus, zoom
7) Check video picture quality: view a color bar chart and verify that the
colors on the monitor are (visual reference) the same as the bar chart.
V erify that the image is free from any visible video noise.
8) Check green filter operation: the green filter led should flash as it
changes
into an out of the green filter mode. It will stay lit while the green filter is on.
9) Check blue filter operation: the blue filter led should flash as it changes
into and out of the blue filter mode. It will stay lit while the blue filter is on.
10) Check the Light Director movement: It should move freely and detent
in three positions: 45 degrees left, right and back to center. Check the
projected spot for uniformity and no dark spots.
11) Polarization movement: Check polarization arm for free movement of
o
20
in both directions.
12) Check magnification index: Push magnification button on colposcope
and verify that magnification index displays on the monitor .
Service Manual 880325 Rev . A Welch Allyn Video Colposcope 1
Section 2 - Service
13) Check all mechanical fasteners for tightness.
14) Check all cords and cables for solid connectionsduring unit operation.
15) Check the printer functions of the colposcope handle.
Verify that the “F” button will freeze the live image as displayed on the moni
tor or three beeps from the printer and “No Paper” text appears on the moni
tor and printer.
Verify that the “C” button will print the frozen image displayed on the monitor .
Verify that the “V” button will cause the monitor to alternately display the live
video then the still “frozen” image.
16) Check the stands (swing arm, and vertical pole, casters) for function and
smooth operation. Check the brakes.
17) Check lenses for scratches, fingerprints, smudges, dust, moisture.
2 Welch Allyn Video Colposcope Service Manual 880325 Rev . A
Section 2 - Service
2.2 Service Tools
1) T orx T-15 Driver for housing screws.
2) English Hex Key set for various hex head fasteners
3) One extra hex key
4) RS232 Interface Cable Welch Allyn order number 88500
5) Strap Wrench T-10913
6) Achromatic Lens Assembly T ool - T-14716
7)Monitor: Service Equipment should include a monitor for your standard. This is
a Sony PVM 1350 (NTSC) or a Sony PVM-1450 QM (P AL).
Note: this is not an underscan monitor as is the Sony PVM-1351Q
AC120V 50/60Hz (NTSC/PAL/SECAM)
8)Printer: T o check the RS232 functioning of the Colposcope. This is a Sony VP1800MD (NTSC) or a Sony VP-1800 EPM (P AL).
9) Standard electronic hand tools and Digital V olt Ohm Meter will be required for
basic troubleshooting such as checking output voltages and continuity.
Service Manual 880325 Rev . A Welch Allyn Video Colposcope 3
Section 3 - Troubleshooting
3.1 Troubleshooting
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Note: For monitor default settings, refer to the Owner’s Manual included with the monitor.
Service Manual 880325 Rev . A Welch Allyn Video Colposcope 1
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4 Disassembly and Repair
Assembled Colposcope
CAUTION: LAMP AREA WILL BE HOT
IMMEDIATELY AFTER LAMP OPERATION!!
Slide access door away from housing assembly .
Remove connector from lamp. Note: Connector has 2 different size holes.
See Service Note in Section 2, page 2.
Service Manual 880325 Rev. A
Welch Allyn Video Colposcope 1
4 Disassembly and Repair
Slide lamp away from lamp housing assembly .
Observe the correct path for lamp wires.
Remove the 4-torx screws from left outer housing with a T-15 screwdriver .
2 Welch Allyn Video Colposcope
Service Manual 880325 Rev. A
4 Disassembly and Repair
Reach under label and peel away from housing.
Open outer housing this way to avoid stress
on ribbon cable.
Disconnect locking connector.
Service Manual 880325 Rev. A
Welch Allyn Video Colposcope 3
4 Disassembly and Repair
Observe the correct positioning of ribbon cable
in left outer housing.
Remove the 6 phillip head screws that hold the
switch PCB to the left outer housing.
The switch pad is attached to the left and right
switch PCB by rubber tabs. Gently pull tabs
away from switch PCB.
4 Welch Allyn Video Colposcope
Service Manual 880325 Rev. A
4 Disassembly and Repair
Logic PCB is removed by removing connectors and 4 phillip head screws.
Note connector orientation and wire harness
path on Logic PCB.
Fan wire exits on left side.
Gently pull the light director from focusing sleeve.
Service Manual 880325 Rev. A
Welch Allyn Video Colposcope 5
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