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You are correct, Stephen, they are reversed. My parts donor board contains an MJE2801. Its base and emitter are reversed in comparison with the TIP35. The emitters on the board are closer to the

Yes Dave, I’m good. Don’t bother. And Thank you!!

Hmmm ? When I look at the data sheet for the MJE2801 (Q1534,Q1546, Q1566), it has exactly the same pinout as the TIP35C I used. However, now that I have a better and clearer view of the board

Thanks Toby!

That's the same as 070-1330-00465Service.pdf on https://bama.edebris.com Raymond

And I've personally scanned a clear one, not sure if it's the right SN range for you. https://docs.telegraphics.com.au/Tektronix_070-1330-00_465_Oscilloscope_Service_Instruction_Manual.tif (note,

Much, much better! Thank you Ozan. ?

AFAIK, the same one is used in the HP 8620 main frame. These are sometimes offered at low prices. I have two but just one plugin. The fan in both is fine. Raymond

Raymond

If this is the Siemens motor version, HP also used this motor in the 8640B signal generator so searching for replacement parts for that might reveal some possibilities. Thanks, Barry - N4BUQ

Hi Stephen, Did you look at the SMs at : https://bama.edebris.com/manuals/tek/465(2)/ and https://bama.edebris.com/manuals/tek/465/ Ozan

I meant to say "If no shorts elsewhere observed, check individual diodes in diode bridges". Since you're looking for shorts (not PN junctions) in individual diodes in the bridges, that's usually

Systems are not working well today. I'm not getting messages until much later than they are posted, so apologies if they are out of sync. Dave

I believe someone mentioned that the 465/475/485 family used the same fan motor. This got me scared, so I pulled out my 465B Service Manual to compare. I finally found the fan and the motor is listed

How is it broken? If it's a plastic part and it's not grossly deformed, it can likely be repaired to like-new condition at least when it comes to the functionality. If it's metal, probably as well,

Shorts in the power rails after the buffer circuits usually aren't able to cause blowing of the mains fuse. That's why I suggested checking the circuits as in my message about half an hour ago.

BTW, you’ll notice that I’ve replaced the 2 missing pass transistors with TIP35C’s. I checked the pinout, ans it seems to be the same as the MJE2801.

Yes Raymond, This is the fuse I’m talking about. Good pieces of advice, as usual. Thank you ?

On Thu, Apr 8, 2021 at 09:41 AM, Dave Peterson wrote: Interleaved, > Stephen, > > I don't quite have the equipment to scan the pre SN B250000 11x17 pages, but I > can take photos and look up specifics

Hello Joe, I use a capacitor checker from Mr. Carlson's Lab, and that works very well. As far as your list of capacitors goes, I have had very good luck with Good-All capacitors! I have checked many