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Yes, but no. Everything is fine. As you understood, I was not probing at the right place. I was misled by the +/- 9.1V beneath the capacitors, so I probed there because it was an easy access.

Ah, so your earlier "my bad" message meant to say that nothing is actually wrong with the +/-10 rails. Got it. However, regarding: "Instead of checking voltages between chassis ground and directly at

Yes, you’re right. But weirdly enough the +/- 9.1 are also mentioned at the capacitors. Which is misleading. That’s why I expected that when I checked there, but nope…

The voltages taken directly at the emitters read + and - 9.7V. All within specs.

One other note: Even though the two rails are named "+10" and "-10", note that the schematic shows that the REAL values are +9.1 and -9.1. Pete

What about D213 and D216? You can simply measure the voltage at the cathode of D213, and the anode of D216 (or at the Base of the associated transistor, if that's easier to get to). Should be around

Yes, it's clearly been a long time since I've had to work on one of these. I was thinking that pulling the drive dog forward would disengage the drive dogs from the rear drum, but that bothered me, as

Hello Lyle. If you can't locate a replacement set, have you considered 3D printing a set? https://www.thingiverse.com/thing:4168123 J

Thanks everyone for your valuable feedback. Thank you for the heat sink suggestion avtek2. Reading through the various threads about "horizontal output IC" cooling, there seems to be an even split

Hi Pete. They are not shorted. I have checked all the transistors in the power supply with a dedicated transistor checker. They are fine and within specs.

My bad. I wasn’t probing the right places. Instead of checking voltages between chassis ground and directly at both emitters, I probed between ground and + C215/ C218. According to the schematic,

My current understanding is capacitance directly plays in to rise time. Lower capacitance faster the rise time. I would expect this to be fine. But for D180 in a 284 capacitance is a HUGE deal . Zen

A follow-on question: How critical is the total capacitance for this TD? Specs state 8pF but the TekWiki page states that as a maximum and I presume less would work. I found a 10mA 2pF and am

Also some of the supplies in this unit are unregulated. Check the transformer for correct line voltage. The line voltage have moved up I the world sence these were built it is normal for some of the

Hi Stephen, My first thought is that the series regulators on +/-10 are not regulating. Most obvious issue would be Q213 and Q217 are shorted, and/or D213 and D216 are open. Check the 27VAC at the

That's a very simple circuit with two main causes for your problem, although a bit surprising the two separate supplies are both bad: 1. D213 and D216 open. Check if they carry +10V and -10V aginst

Hi all, I finally found the time to repair the Type 106 I bought back almost a year ago… A few months ago I had offline help from 2 very nice people here. That thing had shorts everywhere. A few

Thanks, Dave (and all the others who have given recommendations).? I poked around a bit, and all the door switches operate properly, the relays are all open circuited as shown on the wiring diagram,

I'm guessing that this is what we used to call a "zebra stripe" HV resistor. To find a replacement, we'd need diameter, length, and the threading in the end, and, of course, the resistance, 600 MOhms.

Check 32V Unregulated supply in particular. Check Fuses F736, F746 and F768. A slip of the probe can open one or more of these. 32V unregulated is most likely dead and this will kill the HV section.