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Fujitsu FM Towns II Riparazione Alimentatore

Fujitsu FM Towns II Repair

Inizio subito dicendo quanto odio riparare gli alimentatori Switching, una delle cose piu’ noiose e fastidiose seconda solo alla riparazione di Televisori a Tubo Catodico, almeno per me.

Anche questa riparazione e’ stata fatta. Il guasto e’ stato quasi sicuramente causato da una copiosa fuoriuscita di elettrolita (fluido conduttore di solito formato da una soluzione salina od acida che si trova all’interno dei condensatori Elettrolitici) e una pericolosa accensione dopo che l’acido era fuoriuscito.

La morale e’ molto semplice, c’e’ stato un corto circuito che ha fatto diversi morti, una buona parte dello stadio primario / pwm e del secondario.

I componenti che sono stati sostituiti sono i seguenti:

  • 1 x Electrolytic Capacitor 3300µF 16v 105°
  • 1 x Electrolytic Capacitor 1000µF 25v 105°
  • 1 x Electrolytic Capacitor 2200µF 35v 105°
  • 1 x Electrolytic Capacitor 1000µF 100v 105°
  • 1 x Electrolytic Capacitor 330µF 160v 105°
  • 1 x Electrolytic Capacitor 47µF 25v 85°
  • 1 x Electrolytic Capacitor 10µF 100v 85°
  • 1 x Electrolytic Capacitor 22µF 25v 85°
  • 1 x Sanken Hybrid Voltage Reculator Module STR 53041
  • 1 x Photocoupler TLP 541G
  • 1 x Overcurrent Protection Elements ICP N10
  • 1 x Transistor C1815GR
  • 1 x Transistor DTC114 ESA (C114 ESA)

Dopo 1 settimana ho deciso per scrupolo di sostituire anche tutti i condensatori della sezione alimentazione del computer.

Componenti sostituiti:

  • 1 x Electrolytic Capacitor 3300µF 25v 105°
  • 3 x Electrolytic Capacitor 5600µF 10v 105°
  • 1 x Electrolytic Capacitor 2200µF 10v 105°
  • 1 x Electrolytic Capacitor 330µF 35v 105°
  • 1 x Electrolytic Capacitor 1000µF 16v 105°
  • 1 x Electrolytic Capacitor 470µF 25v 105°
  • 1 x Electrolytic Capacitor 1µF 50v 105°

Galleria della riparazione:

  1. RetroRepair
    17 September 2014 a 23:45 | #1

    Great article! I just had the same issues with a Towns 2 and though I did as you did and replaced those parts, the monitor still won’t turn on and the cd drive isn’t reading any discs, though it does power on. I don’t think it’s booting :(

    Any idea what I should look at next?

  2. RetroRepair
    18 September 2014 a 17:05 | #2

    Well I tested with an external source (FM Towns 1) and still no image. I’m certain the monitor isn’t turning on. Not really sure what to do from here aside from replacing all the remaining components.

  3. RetroRepair
    2 October 2014 a 14:41 | #3

    Ok well, I had to replace also the other two N10 OPEs as well as two C2236 transistors but it works!!

    I get the boot logo but it’s not reading the disc. I am so happy I go this far though!

  4. 1983parrothead
    6 December 2015 a 21:55 | #4

    Some people said that it is best to purchase a working PSU over fixing a damaged one. Unfortunately, finding a new one is next to impossible. But repairing is risky due to how lethal electricity is. I have a FM TOWNS II HR model and it doesn’t stay on. It turns itself off after a few seconds or couple of minutes.

    What should I do?

  5. Samson
    29 March 2016 a 5:19 | #5

    I have an older model Towns and I’m trying to figure out why the volume indicator LEDs aren’t lighting up. Is it possible that’s caused by a bad capacitor?

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