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My IIfx progress

SophieRose

Well-known member
I thought I'd start a thread about my IIfx as it's gonna take a while to fix with lots of photos.
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Today I repaired a few vias under one of the batteries.
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Phipli

Well-known member
Awesome :)

What's your process? I tend to visually search for damage, repair, then test for continuity... then once I've fixed everything I don't like the look of, power on and see if there is anything still not working.

Then I flail about like an octopus out of water until I happen upon a solution. Based on guesswork, intuition and brow furrowing.

It is time consuming, but it works eventually by sheer bloody-mindedness.

Not having an oscilloscope is a bit of a frustration.
 

SophieRose

Well-known member
Yep same process here too..visual stuff first.Then deductive reasoning.. 😃 what Ive got left.. if any 😂

I'm taking my time cos it's a IIfx.
 

Phipli

Well-known member
Yep same process here too..visual stuff first.Then deductive reasoning.. 😃 what Ive got left.. if any 😂

I'm taking my time cos it's a IIfx.
I've never even used an fx, they're quite a monster.

I need to get back to my IIx sometime, I got it running after it arrived battery bombed, but it has gained intermittent video. Once I have it stable again and put metal clip RAM sockets in it, I plan to solder in a CPU socket so I can use a socket processor accelerator.

I have a 33MHz upgrade meant for a IIvi waiting for it. That's my poor-man's fx plan. Sadly without the quirky hardware.
 
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olePigeon

Well-known member
@Phipli They're super fast. I think probably because of the 40 MHz bus speed. It feels faster and more responsive than my 040 accelerated IIci.
 

olePigeon

Well-known member
Really nice job on the repairs. Mine had a capacitor blow followed by the main 5v (or was it 12v?) trace turn bright red then curl up like one of those cheap firecrackers. Replaced all the caps and ran a nice thick bodge wire to fix the destroyed trace, and it's been functional ever since.

Edit: Speaking of capacitors, while you're at it, I'd recommend a 25v capacitor for C1. That one likes to blow and leave a little crater. I'm convinced it's under rated, and when the cap become even just barely underperforming, it'll blow.
 

SophieRose

Well-known member
Good tip with the caps.. was thinking of fitting 25v caps to be sure. Today I got the shielding out.. that was a job n arf 😦instasquare.photoeditor.effect.cutout_2023419152238605.png
 

Phipli

Well-known member
Yep 😂 sorry.. sometimes I type how I speak.
Good thing I don't or it would be all solid blocks of text with no punctuation and incomplete sentences.

I apparently bail from sentences as soon as I see understanding in the other person's face.
 
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