Hi Raymond , I found the group on groups.io and I have also found the articles covering the DC100A cartridges , many thanks for that . Brian

Hi Raymond , I checked the capstan as I have had that problem on very old pc tape drives , the capstan roller is ok . When I looked at the cartridges I thought at first that it had reached the end of

Chuck Harris wrote on 4/3/2020 10:48 AM: <snip> Hello-- IIRC, at one of my former employer's facility, the solder flux-remover solvent in use at the time attacked conventional electrolytics' rubber

Brian, Are you aware that very often, the polyurethane capstan covering material in these drives has crumbled or - worse - changed into a sticky chewing gum-like mass? That could explain how your

Hi Ernesto, The bayonneting pins on a BNC are not milled out. They may appear that way because the surface in which they are pressed into the connector is milled flat. If this was not done, the pin

Hi Raymond , thanks for that tip I'll have a look at that as the tape in the cartridge has not actually been damaged -- yet Brian

Groups.io's hpseries80 group has discussed these tape cartridges and presents solutions for replacing the elastic band. Drives like the one in the DAS 9100 were used in HP85- HP9845 -like programmable

Chuck, It is easier to condemn the sellers than the buyers. We buyers are the innocent victims, our money is usually free of defects. Yes, plastics are plastic, and some degrade with time. But the

Unfortunately, it doesn't always work that way. The caps tek used leak through the lead seals long before they cease being good enough to meet the ripple specs. I think the capacitor manufacturer

Hi Dan , fortunately from the point of view of history the only tapes damaged were ones I had set up as I did not get any of the pnemonic tapes when I purchased the DAS . The tapes seem to have had

That is where I am headed next just wish they were a little easer to get to. But that is what makes a restoration fun

Before anything else, check the large capacitors after the rectifiers (ripple voltage there) - C821, C811, C813 etc.. I've repaired several 76x3 scopes where at least some were dry and the regulator

Hi Brian, I have a DAS 9129 with the tape drive option. The DC-100 tapes use an elastic tape tension band internal to the cartridge to transfer motion from the drive capstan to the two tape reels.

Well before I do anything else I have to address the capacitor issue. Got the scope hooked up to the -50V rail and there is 260mV pk-pk of ripple . It is a nice clean saw tooth generator at the

A good start would be to check the all the power supplies voltage and ripple content, according to the service manual. That should give you an idea of how urgent recapping attention is needed.

Hi Toby, Any ESR meter you are likely to own is simply a 50KHz AC ohmmeter. Every capacitor has both its intrinsic capacitance, and an effective series resistance, so it looks like

Rich, There is a spring in the switch that breaks contact with a metal post. You need to clean the spring and metal post to stop it from continuing the drift in the last direction. --Victor

Thanks for the great info Siggi...again! Rich

The -50V supply depends on the +50 unregulated  voltage.  The 130 V supply also depends on a good +50 V.  You might want to check the caps C808 and C809 that's where I found a bad cap when

Hi all , anyone remembering this beast , did you ever have trouble with the tape drive . Mine has just eaten 3 DC100A cassettes . Did anyone ever replace the tape drive with anything ekse , say a USB