Search results

I went to power it up, but the AC adapter was dead. I cracked it open and found the capacitors were all out of spec so I've ordered some new ones. In case anyone in the future needs to recap this adapter, here's what's inside. C22: 68uF 400v; 18mm Dia; 32mm L; 85° C2 C13 C14: 470uF 16v; 8mm...

I've been looking for one of these displays for years. Today was my lucky day! This is a very rare Radius branded version of the SGI 1600SW. It's 1600x1024 and would normally have an OpenLDI connector. The person I got this from got it from a SGI engineer who made a custom DVI cable for it...

Ah I see. This is what I was missing. Thanks!

@eric I did look through there but must be missing something. Which folder or file has the bootstrap stuff? The ones I opened were al blank. Thanks!

The DB-25 has been working out great. It's a lot easier to manage disk images and transfer data back and forth to a host system via Basilisk compared to SCSI2SD. As someone mentioned above, it'd be nice to have pre-made image with various utilities already installed. It can be tough to bootstrap...

I was pretty sure I did get it in that slot, but will take another look. Regardless, it snapped in place and is square after trimming those pins. Thanks for the tip!

I received a DB-25 kit today from @eric today and got right to putting it together. Assembly went great, but the device would not sit low enough in the enclosure. The front set of DB-25 pins were pressed against part of the case. After snipping those down, everything fit okay. I've been using a...

I got some new optoisolators. Before installing I tried the PSU again and it had its same symptom of low voltage. I replaced the opto with a new one and it had the same issue. The new opto works okay in the already known-good PSU. Bummer! Since then I've: Applied hot air to warm up the PSU. No...

Not sure if this is documented elsewhere, so here's a map of all the Duo Dock PSU electrolytic capacitors. Everything on the daughter boards is solid-state.

It can be a lot of things. You need to narrow down where the failure is whether it’s the primary or secondary and which rail(s). I recently repaired a PSU which turned out to have a bad optoisolator. It seemed to test fine out of circuit but replacing it did the trick anyway. There are a lot of...

I have a Quadra 840av. Would the rom dump from that help?

You could make an extension but you’d need to use a header which might just break off due to pull stress.

I removed the optoisolator and tested it out of circuit. It seemed fine. Diode check on the LED pins was OK. I attached a 300 Ohm resistor to its anode and bench power supply positive lead. Attached the cathode to the PSU negative lead. measured resistance across the collector and emitter from...

A while back in this thread we talked about how nice it would be to have an Analog Board to MLB extension cable for the 128K/512K. I finally made one today and it works great. I made mine 14" long which gives enough room to move the board around. If I make another, I might do 16" just to have...

My local parts place didn't have a TCDT1100G optocoupler in stock, but did have IL74 which I thought was basically the same (but is not). I dropped it in anyway and the voltages were all higher, but not high enough and the supply would switch on as soon as it was plugged in rather than waiting...

I'm going to journal here the things I've tested so far Capacitors (ESR OK) C04 C09 C10 C11 C12 C13 C15 C17 C19 C24 C30 Diodes D7 (Diode ahead of the -12v voltage regulator) Transistors Q4 TYN682 silicon controlled rectifier (seems OK in circuit, but haven't tested outside yet) Q5 Q6 BUZ80...

@rdmark Very clever! You might want to keep the leads long so you can mount it on the drive frame for easier access.

I have a Duo Dock that works okay with a known good PSU, but it's own PSU isn't working correctly. It has been recapped, but still just gets a faint tick when the power button is pushed. The eject mechanism works okay. 5V for the eject button and ~20V for the eject motor work okay. The power...

The auto inject 1.44MB drives use the same mechanism as this video. Is there a particular step you’re stuck on?

FWIW the symptom you describe is exactly what mine had before recap. Beyond replacing the caps themselves, some nearby ICs were quite crusty. Rather than just clean, I removed them, scrubbed the pads and cleaned up both sides of all of those chips. I know you've ultrasonically cleaned it, but...