Recent content by CharlesT

Just so this doesn't languish forever with no resolution... Per above recommendations, on both units, I replaced the optocouplers and the TDA devices. On the unit that I blew by not connecting the HV lead to the CRT, this had no efect, something else is at issue. I checked all the diodes and...

Here's an Ebay listing for the TDA4605s.  https://www.ebay.com/itm/291471780717 I just received an order from them. It seems less likely these would be at fault in your case since a bad one would most likely result in your supply not switching at all, meaning no output.  

Well, I might be closer to 'ending' up somewhere, closing in on 70.  Thanks for the words of encouragement. I've got a set of the TDAs on order, will probably get some optocouplers while I'm at it. I'm gonna treat this as a learning experience, don't really 'need' the LC. It's just that it's the...

Thanks techKnight. I actually did check the HOT after the first failure and it seems to be OK, obviously under no load. The badness must have reached farther back so that the switched mode supply no longer does any switching. That's about all I know. After two bonehead moves on these guys I'm...

Hello all I have now managed to "brick" two analog boards in the process of doing recaps. I've had good luck with all my other recaps but these seem jinxed. The first came up properly (logic board and hard drive) but I had forgotten to connect the high tension led to the CRT. This bodged...

Is anyone familiar with the bootloading process following reset? The 68000 data sheet shows going to address 0 following reset, which is RAM, but ROM, which presumably is where the loader resides, starts at 0x40,000.   And Kai, most of the 68K signals are available on the PDS slot, so...

Have you been able to get the Rominator to work yet? I have one in my SE/30 as well. It's a common problem with the Rominator, not sure if it's board thickness or some other alignment issue, but very likely you'll have to play with the positioning of the thing in the rom socket. At least that's...

Hi, I have both V5 and V6 versions of SCSI2sd in various systems. I have never had any issues with the V5, but the V6 has always been very sensitive to environmental conditions, specifically ribbon cable condition and noise from the power supply. With those conditions the symptoms were all over...

Hi, not such a long shot after all. Still have all the parts and would be happy to send them your way for shipping costs. No idea what the state of the screen is since I haven't turned it on for many years, but the recapping was done by Charles in Michigan before he went off the rails. All the...

Have a look at my efforts in that direction.  Might help in your search, although it's been a couple years.

I just recently fixed one of these, different symptoms than yours. I replaced all the electrolytics on both the main board and neck board. Did not fix the problem. Problem turned out to be bad solder joints on the flyback. Redid all those and it was mostly working. The other problem turned out...

Totally agree with Compgeke. I'm using a 7600 for exactly that purpose. It ties into the ethernet network and using the serial ports and Apple's internet bridge s/w ties serial appletalk to that network. Plus you have both SCSI ports and can put in an IDE card for IDE drives. Plus it's easy to...

This sounds very similar to a problem I had with an LC575 and both comm slot and pds ethernet cards. The wouldn't be recognized by the Faralon software and caused booting problems. Problem turned out to be the power supply going weak. Re-capped that and everything works. The weak supply took...

Just wanted to close this off. I managed to find a replacement cable for the LG panel, as well as a "new" correct LG Phillips panel, both right here in the US, in Texas.  Installed both and that Pismo is bright eyed and bushy tailed again. I now feel like I can replace a Pismo panel in probably...

I used the WD-40 on a Pismo and it worked a treat! Smells for a day or two but really perks it up nicely.