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Actually am I right about taking readings from the Molex connector? If I take a reading from it I get 11.92v. But from pin 1 and pin 4 of the main power connector I get 11.98v

Thanks! I've not checked the power connector at all. I will do so. You will have to help me identify the ISOB though. I'm quite new to this! Thanks. BTW I did find a "pinout" for the 610 PSU. I guess with some wago connectors and an ATX PSU I can check if it boots fine or still exhibits the issue.

Thanks. I tested from one of the two Molex connectors. I assume this is exactly the same as the logic board connector. Unfortunately it's not exhibiting this issue at the moment. No matter how I boot it up the chimes work and it boots fine! On boot (when chimes sound) 5.12v 11.94v On boot...

Bizarrely since posting this the Quadra is mostly behaving. It was in my workshop so I brought it back into my office, reassembled into the case and it boots fine. I reread this post about a soft power Quadra that was failing to turn on as the caps were not being discharged, The Quadra 610 does...

My recapped Quadra 610 has started becoming a bit problematic. This all started when I'd been trying to get the CD Rom drive working (I'd recapped it but it still does not work) so the Quadra had been on all day. A few times in the past there has been no boot chimes. Generally I'd found...

Just checked one of those CDs and "df -T" on a Linux box tells me it's "hfsplus". My 7.5.5 Mac will not read hfsplus disks right! Looks like you are completely right. Now I'm impatient to get the PSU recapped!

Thanks. I really hope you are right! I'd previously tried audio CDs. Also pressed CDs. I work for a very small Mac software company. It's been many years since we've distributed software on CD (..and even longer since it ran on 68k processors!) but I had a few disks kicking around. I never...

I'll not turn it on again until the PSU is revitalised!

I've still not got around to recapping the PSU. I ordered the caps some time ago, but time is limited! Yesterday I'd left the Quadra on all day. I turned off the Quadra to change something and when I turned back on there was no chimes! I turned off and tried again this morning. On power on the...

Unfortunately that extension is already there. Oh well!

Nice one! I'll get that extension added straight away and see if it makes any difference! The CDs are a mix of PC ones and a few that I think are HFS but I do not remember. You posted just in time as I was about to remove the drive and add it to the pile of "..things i really must fix one day...

Well if it's any consolation I did get excited for a few minutes! I'll go back to twiddling the pots to see if anything changes :-)

Thanks! Good idea. There is: - Apple CDrom 5.3.2 - ISO 9660 5.3.2 Is that about right?

Sorry to go on again, but I gave the CD-ROM another quick go. I'm now fairly sure all caps are properly soldered (and the right way around!). By turning the two pots (TRK_GAIN and FCS_GAIN) I have got the drive to always retain the caddy and not spit it back out. I always get a message that the...

I'm afraid not. All the circuitry is on the upperside. Although those pots in the photograph are actually very close to the lens assembly, just on the other side of the board. Also their names seem like cryptic clues - TRK GAIN = track gain? FCS GAIN - Focal gain. Well I am clutching at straws :-)

..a bit more tweaking and it now consistently shows the "unreadable disk" error.

I checked and redid a few of the caps. It did not appear to make much difference. However, I noticed six pots on the reverse of the board. I'd missed these before. One is called FCS GAIN. So I gave it a try with very small turns. Now I can get the disk to do one of the following: It takes a...

Thanks. That's useful to know. I'm not sure where to look next though! :-) Although I've just read this article about repairing old optical drives and the author says they have only ever failed to fix two! So I am still motivated.

I took the drive back out, removed the case and connected it to a spare PSU. WIth the board removed (but still attached) I can see the disk spin up. It does spin a little erratically. It turns slowly, then much faster, slows down, then speeds back up again before ejecting.

That's a very kind offer. Thank you. I will persevere though. It's been many decades since I've done any soldering and I'm quite enjoying learning. I've checked each capacitor and all seems well. I did reflow one that did not look great (although it did not budge when nudged it). Unfortuantely...