Recent content by Fizzbinn

The opening "hole" is 102mm wide by 25.5mm high. the width measured at each of the four corners of the hole is different. Top Left: 8.75mm Bottom Left: 10.85mm Top Right: 10.75mm Bottom Right: 12.45mm

Got the calipers out... The top measure is 4.5mm. The bottom one is a bit trickier, with one side of the caliper square and flat in the opening and the other side at the absolute bottom of the bezel plastic (which is toward the back of the part, where the clip is that snaps it onto the case) is...

Sure, although I'm not exactly sure what to measure... perhaps the rectangular slot dimensions and its distance from the top and sides?

I got a new old stock bezel/bracket kit off eBay several years ago that looks just like that. "DataStor Macintosh Zip/Jazz Mounting Bracket for G3 Desktop, 7200, 7300, 7500 and 7600 Machines" Still have the box which has some info you might be interested in: Here's a scan of the...

Oh yeah, the new caps are on order, won't power it on until I get all the old ones replaced.

Got a "new" SE/30" that I'm going to mod with @zigzagjoe Color LCD kit and while the ROM SIMM clips aren't broken they seem to be barely holding on. The ROM SIMM was really leaning. Printed the type B" v2.3 one and it feels much more sturdy now! It did have one broken RAM SIMM clip, so printed...

Is it possible your not using the last version of System Enabler 403? System Enabler 403 ------------------ 1.0 First release for Macintosh LC 520. 1.0.1 Manufacturing release only. 1.0.2 Added support for Macintosh LC 550. Source...

Apologies if you already know/did this, but did you check your AppleTalk and TCP/IP Control panels are set to Ethernet and not the default LocalTalk and MacIP settings?

Hmm, from your sleuthing perhaps the reason why others left off R80 as needing to be removed is that is was vestigial? The Q1 component is missing from both the LC 520 and LC 550. Its possible inter-layer connections connect R80 in a meaningful way to other components but maybe not, it seems...

I think there was some confusion, my LC 550 board is a Rev. B (820-0595-A, 4.5V PRAM battery with velcro) and @kefkafloyd 's LC 550 board is a Rev. A (820-0368-A, 3.6V 1/2 AA PRAM battery) so we have confirmed both lack all 4 resistors, although more confirmation is never a bad idea...

Really cool article, thanks for sharing! I definitely can see documentation error leading folks to think the LC 550 and CC II logic boards were substantially different when they actually aren't. I do wonder what controls the different gestalt IDs though? Macintosh LC 520 = 56 Macintosh LC 550 =...

Here you go: High Res (as I can do) front and back of my LC 550 logic board. RC67, R75, R79 and R80 not populated: For similar resolution reference my LC 520 logic board: Another thought, there are at least two versions of the LC 550/CC II logic board, one with the 3.6 Volt 1/2 AA...

LOL, Instead of spelling it out, Two-S-I, say it like it’s a word, Twosi, sounds like Tu-see, which rhymes with…

I purchased a couple of the IIsi Power Supply Replacement (Mean Well) PCB kits from CayMac Vintage a while back and wanted to post my build experience. The kit included the resistors, transistor and LED, I purchased the 4 Mean Well power supplies and the relay from Mouser: Qty 1 - IRM-60-5...

I purchased a couple of these PCB only boards from CayMac Vintage a while back and wanted to post my build experience. I ordered the required Mean Well power supplies from Mouser: IRM-10-12 (12V 0.850A) https://mou.sr/4gNUPOV IRM-20-5 (5V 4A) https://mou.sr/4mXZss7 And planned to make use...