Search results

  1. felto

    CRT monitor

    My computer monitor just went on the frizzs. So I decided to open it up and investigate. I do not see the obvious burnt component and also checked out the fuse if it was burnt. I put a voltmeter on the output transistor and I get around .6 volts which tells me that it is probably good.  Can...
  2. felto

    220V to 110V

    Hi I just would like to inquire about a coffegrinder that was given to me from europe.  The plug on it was not the standard 110V supply so I changed the plug on it to suit my outlet.  Now it still grinds but the problem is that it runs slower.  I think I need to change the transformer or...
  3. felto

    Slotted Optical Switch

    Has anyone ever heard of this switch? It looks like a 'U' shape and has four terminals to it soldered to the circuitboard. In between the 'U' shape is a grove where something blocks the optics and I guess that it turns it on or off. My question is does anyone know how to measure this with a...
  4. felto

    Need help in fixing lexmark printer

    Hi all, Can anyone help me in fixing my lexmark printer? I have a multiprinter type (scanner, fax, print) and the problem is in the main circuit board of the printer. When I connect the power cord I can see a spark from the connection but I get no power to the unit. The board does not have...
  5. felto

    Chip Identity?

    Does anyone know what this chip is? I am trying to find the schematics of it but cannot find anything on it. It looks like a 555 timer with 8 pins to it. But it doesnt say anything like that. Does anyone know a website or a databook that they may have and can look up the schematics for me...
  6. felto

    Logic Gates IC Chips

    Hi all I would like to know how to test the logic gates of an IC chip, for instance a 'NAND' gate or an 'AND' gate in a circuit with my voltmeter. I do not have an oscilloscope but my voltmeter is capable of reading the highs and lows of the logic gates. Where do I need to hook up the leads...
Top