REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

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Saturday, 16 March 2019

HOW TO DISASSEMBLE WELCHALLYN VIDEO COLPOSCOPE - MEDICAL EQUIPMENT

HOW TO DISASSEMBLE WelchAllyn VIDEO COLPOSCOPE - Medical Equipment



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.
  • 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.
  • Reach under label and peel away from housing.
  • Open outer housing this way to avoid stress on ribbon cable.
  • Disconnect locking connector.
  • Observe the correct positioning of ribbon cable in left outer housing.
  • Remove the 6 Phillips 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.
  • Logic PCB is removed by removing connectors and 4 Phillips 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.
  • Observe the positioning of plastic tie wrap.  This tie wrap serves as a polarizing filter brake.
  • Unscrew focusing sleeve from lamp housing. Note orientation of light director, filter and focusing sleeve.
  • The glass rod/ferrule assembly may come out with the focusing sleeve.  Do not lose the UV filter in the end of the brass ferrule.
  • Camera chassis removal, from the right housing is accomplished by removing the 3 torx T-15 screws from right outer housing.
  • Remove camera from right housing.
  • Unscrew outer lens.
  • Remove lens gasket and lens filter. Note lens filter tab orientation.
  • Removal of ballast PCB is accomplished by removing connector and 4 screws.
  • Unscrew three Phillips head screws for Sony camera removal.
  • Gently pull camera from chassis.
Note the orientation of fiber washer. During reassembly make sure fiber washer is over the thermal cut out as shown.  Improper installation will result in power supply damage. Use thread lock 222 on the screw.  Do not over tighten.