Welch Allyn 88000A User manual

WELCH ALLYN VIDEO COLPOSCOPE (Introduced 12/00) i
SERVICE MANUAL 880325 REV. A
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.
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ii WELCH ALLYN VIDEO COLPOSCOPE (Introduced 12/00) SERVICE MANUAL 880325 REV. A
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 Table ...................................................................... 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

Section1 -General Information
Service Manual 880325 Rev. A Welch Allyn Video Colposcope 1
1.1 About the Video
Colposcope
(Introduced December
2000)
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 instruc-
tions on use and cleaning. (Domestic manual part
880324 and international manual part 880332).
A Colposcope Quick Reference Guide (part 880331)
is also available.

Section1 -General Information
Service Manual 880325 Rev. A
2 Welch Allyn Video Colposcope
1.2
Help Information Allserviceandrepairsmust beperformedbyfullytrained
and properly equipped personnel, using genuine
replacementpartsand correctprocedures. Failuretodo
sowillinvalidatetheproductwarranty.
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).
Thesedocumentscontaincompletedescriptionsof
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.
Safety Warnings

Section1 -General Information
Service Manual 880325 Rev. A Welch Allyn Video Colposcope 3
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.
Figure 1

Section1 -General Information
4 Welch Allyn Video Colposcope Service Manual 880325 Rev. A
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Service Manual 880325 Rev. A Welch Allyn Video Colposcope 1
Section 2 - Service
2.1 Incoming Inspection of Colposcopes
2.1.1 Performphysical examinationofreturned colposcopeandaccessory cables,
cordsetc.
2.1.2 Makerecord of whatcomponentswere received. Noteserialnumbers
whereapplicable.
2.1.3 Checkthe physical andelectricalcondition ofallitems includingS-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.
Verify 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
20o in both directions.
12) Check magnification index: Push magnification button on colposcope
and verify that magnification index displays on the monitor.

2 Welch Allyn Video Colposcope Service Manual 880325 Rev. A
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.

Service Manual 880325 Rev. A Welch Allyn Video Colposcope 3
Section 2 - Service
2.2 Service Tools
1)Torx T-15Driver forhousingscrews.
2)English HexKeyset forvarious hexheadfasteners
3)Oneextrahexkey
4)RS232 InterfaceCableWelch Allynordernumber 88500
5)Strap Wrench T-10913
6)Achromatic Lens AssemblyTool-T-14716
7)Monitor: Service Equipment shouldinclude a monitorfor your standard.This is
a Sony PVM 1350 (NTSC) or a Sony PVM-1450 QM (PAL).
Note: this is not an underscan monitor as is the Sony PVM-1351Q
AC120V 50/60Hz (NTSC/PAL/SECAM)
8)Printer: TochecktheRS232 functioning oftheColposcope. This is aSonyVP-
1800MD (NTSC) or a Sony VP-1800 EPM (PAL).
9) Standard electronic hand tools and Digital Volt Ohm Meter will be required for
basic troubleshooting such as checking output voltages and continuity.

Service Manual 880325 Rev. A Welch Allyn Video Colposcope 1
Section 3 - Troubleshooting
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3.1Troubleshooting
Note: For monitor default settings, refer to the Owner’s Manual included with the monitor.

Welch Allyn Video Colposcope 1
4 Disassembly and Repair
ServiceManual 880325Rev. A
.
Assembled Colposcope
CAUTION: LAMP AREA WILL BE HOT
IMMEDIATELY AFTER LAMP OPERATION!!
Slideaccessdoor awayfromhousingassembly.
Removeconnector fromlamp.
Note: Connector has 2 different size holes.
See Service Note in Section 2, page 2.

2Welch Allyn Video Colposcope
4 Disassembly and Repair
ServiceManual 880325Rev. A
Slidelamp awayfrom lamphousing assembly.
Observethe correct path forlamp wires.
Removethe4-torx screwsfromleft outerhous-
ing witha T-15 screwdriver.

Welch Allyn Video Colposcope 3
4 Disassembly and Repair
ServiceManual 880325Rev. A
Reach under label and peel away from hous-
ing.
Openouter housing thisway to avoidstress
onribbon cable.
Disconnect lockingconnector.

4Welch Allyn Video Colposcope
4 Disassembly and Repair
ServiceManual 880325Rev. A
Observethecorrectpositioningof ribboncable
inleftouterhousing.
Removethe6phillipheadscrewsthat holdthe
switchPCB totheleft outerhousing.
Theswitchpad is attachedtothe left and right
switch PCB by rubber tabs. Gently pull tabs
awayfrom switch PCB.

Welch Allyn Video Colposcope 5
4 Disassembly and Repair
ServiceManual 880325Rev. A
Logic PCB is removed by removing connec-
torsand 4 phillip headscrews.
Note connector orientation and wire harness
path on Logic PCB.
Gently pull the light director from focusing
sleeve.
Fan wire exits on left side.

6Welch Allyn Video Colposcope
4 Disassembly and Repair
ServiceManual 880325Rev. A
Note orientationof light director, filter and
focusingsleeve.
Observethepositioning of plastictiewrap.
Thistiewrap serves asapolarizing filter
brake.
Unscrew focusingsleeve fromlamp housing.

Welch Allyn Video Colposcope 7
4 Disassembly and Repair
ServiceManual 880325Rev. A
Theglass rod/ferruleassembly maycome out
withthefocusingsleeve.
Donotlose theUVfilter in the endofthe brass
ferrule.
Camerachassisremoval, from therighthous-
ing isaccomplishedby removing the 3torx T-
15screws fromrightouter housing.

8Welch Allyn Video Colposcope
4 Disassembly and Repair
ServiceManual 880325Rev. A
Removecamera fromright housing.
Unscrewouterlens.
Remove lens gasket and lens filter. Note lens
filtertab orientation.

Welch Allyn Video Colposcope 9
4 Disassembly and Repair
ServiceManual 880325Rev. A
Removal of ballast PCB is accomplished by
removingconnector and4 screws.
Unscrew three phillip head screws for Sony
cameraremoval.
Gentlypull camerafromchassis.