Image Map Image Map
Results 1 to 6 of 6

Thread: Compaq Portable - Help

  1. #1

    Default Compaq Portable - Help

    Hi to everyone. I am searching this kind of transistor (photos). I dont know the type of transistor and i cant find any info. Can somebody help me? This Psu is from a Compaq portable https://i.ytimg.com/vi/2YO-BCqPqs4/m...lt.jpgcomputer . Do you know if schematics are available for compaq portable?
    Thank you in advance.










  2. #2

    Default Service manual

    Here found somewhere else on this forum. Not very helpful for Q3 though. Lists it as a 508 with no replacement data. Hope it helps with the detective work.

    http://download1321.mediafire.com/qb...+-+cscs-15.pdf

  3. #3

    Default

    You could try purchasing the SAMS computerfacts for the compaq portable. They will most likely have a schematic for the PSU in them.

    I had a look on SAMS website and they still offer it for $22. Link here
    System 80 Expansion Interface located! Thanks to all who helped out and the good people in the NZ vintage computer forums!

  4. #4
    Join Date
    Feb 2009
    Location
    Chattanooga, TN - USA
    Posts
    836
    Blog Entries
    1

    Default

    Ok, so no clue on the cross, apparently I chose poorly last year, which is why my repair failed.

    It's labeled just 508.


    Here's a link to the service manual.



    http://www.svfdtn.com/mtx/Compaq%20P...e%20Manual.pdf



    Later,
    dabone
    Last edited by dabone; February 15th, 2019 at 03:52 PM.

  5. #5

    Default

    Based on the schematic posted above it's just a BU508 power transistor. Still readily available.
    System 80 Expansion Interface located! Thanks to all who helped out and the good people in the NZ vintage computer forums!

  6. #6

    Default

    Hey guys. Thank you very much for the support. I was looking for this pdf but i couldn’t find it. Thank you very much. Before i read your answers i replaced the transistor with BD139 and i also replaced the diode next to it which was bad. After i replaced these components the psu worked with all voltages. Unfortunately one tantalum capacitor on cga exploded so i have to replace all these capacitors. Now with this pdf i will examine better the psu and i ll check all the computer.
    Thank you again for the support all of you. !!!!!

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •