Sep 7, 2013

Mascot 719

Got a "new" Mascot power supply to my workbench

Click to enlarge

I didn't expect very much from it but actually it's quite accurate and good power supply after one modification and calibration. At the beginning analogue voltage meter had about 0.5-0.7V offset. That may even break things especially in low voltages (for ex. 4.0V instead of 3.3V).

Datasheet says that it have <1.0mV load regulation @ 15V output, <1.0mV line regulation @ 2A load current and ripple voltage should be under 0.3Vrms. Sense wires are also quite nice addition.

After some tests I opened it up and  found a few calibration potentiometers. None of them appeared to affect volt meters offset until I found a place of potentiometer that had been replaced with ordinary 81k ohm resistor (series with meters coil in voltage mode). That was quite easy to replace with a 100k potentiometer and now it seems to be bang on!

Click to enlarge
Considered also beefier components to zener regulator that seems to get really hot.
..but then thought that if it have worked that many years without any problems, it won't break anymore :) 

Before and after the mod:
Images before and after the calibration:
Click to enlarge
 Current reading seems to be OK.
Click to enlarge

Edit: One of the readers asked about PCB pictures. Download here

21 comments:

  1. Fine method of telling, and enjoyable article to acquire factual statements. here

    ReplyDelete
  2. Hi, sorry my bad English.
    Recommend that you put capacitors on the outputs of the unit, is sensitive to HF.
    Volt increase when exposed to HF warning.
    https://en.wikipedia.org/wiki/Electromagnetic_compatibility

    Do you have more pictures so I can see the components present in (burnt some components)
    access to the schedule?

    Damaged components, burned down.
    Resistors R5
    Transistor T2

    ReplyDelete
    Replies
    1. Hey, I took some pictures and added them to the original blog post! R5 seems to be brown-black-brown = 100 ohm and T2 is BD136.

      Delete
    2. Sorry, there seems to be some problem with sharing .zip from google drive. It requires access, although I set "anyone with the link can view". I'll take a look about that tomorrow.

      Delete
    3. Ok, now it works! :) Changed from Google drive to Dropbox (no login required)

      Delete
    4. I have got 2 schematic versions of the power supply (Mascot 719)
      You can contact me at sp856567@telfort.nl and I will mail you them.
      Yoram Stein

      Delete
  3. Do you have schematics for this? Any other Mascot 719? There are som variants of this. 710's is also of interest.

    ReplyDelete
    Replies
    1. I HAVE GOT SCHEMATICS FOR THE MASCOT 719 MAIL TO sp856567@telfort.nl

      Delete
  4. I have repaired my Mascot 719. I used this blog as reference. You can read how it was done on my blog. http://projects.dahlhjarup.dk

    ReplyDelete
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