开云体育

I guess I am getting a little confused at this time but better understand the situation. Somewhere in there the Tektronix subject changed to HP and storage turned into accessory cases. Earlier model

Hi Ozan, David Sorry for my mix-up, small screen, big fingers, poor lighting. Anyway David, Hakan's document is great. I also repaired several 22XX scopes, in the threads I started about a 2215, 2215A

There were some "miracle material" foams and tough flexible plastics used in the 1960s and 70s. Many of them decompose to very vile residues that are often corrosive. One that had? devastating

Note that checking the leakage of those diodes is important, just a DVM diode check doesn't discover problems. It looks like the behavior of your 485 is different in different settings. As the first

Hi Leo, It is not my 2225, David is the OP. Thanks, Ozan

Hi Ozan, Try to find in the Files section a document called (I believe) "Repair tips for 22XX power supplies" I'm not at home now, so I can not look for a direct link right now, but the document made

Hi: I've seen parts of it (or maybe the whole thing) before on YouTube. The Museum has some films... and from time to time some other YouTube channels post these old films. I'm not sure what OPB has

Let me know if you have questions about the histogram program. Although it has been a mere 40years, I might be able to remember how and why I did certain things.

Shorted Q913 could cause what you saw. However, did you measure it in place or after disconnecting from the circuit? All component information is in the service manual. Section 8-9 (Page 113 in the

I have identified that Q913 is short circuit between E,B&C and I also suspect Q923, but until I get them out that's as far as I've got. I cannot see any bulging caps or burnt components, damaged

Thanks Jeff.

Why did the open filter capacitor destroy the 741s? Surely open filter capacitors is a problem the tester should identify and not itself fail from. Larry

I came across this, and thought it would interest people here. https://watch.opb.org/video/oregon-experience-the-spirit-of-tek/?fbclid=IwAR3LZPr1xFUXyGoRSoFDNEML1VLvEYZXOKvHD_AFiMpnVEg3L8XoHN3KHrQ

I resolved the problem. My confusion was cased by the Tek 070-1304-00 August 1974 manual for the TM501 found on TEKWIKI. This earlier manual shows Q10 on the left and Q12 on the right. The later

Oh yess!!! Thank you folks! The scan you pointed on tekwiki is definitely more, more readable! Thank you again, Max

Thanks, Dennis and good luck to your wife. My experience: I had my right hip replaced in October of last year, due to arthritis. I am 67. I spent a week in the hospital and two more in a rehab

Greg, This is what the HP Accessory boxes looked like and this appears to be the same kind of foam although it doesn't appear to be deteriorated. But sometimes the foam that we encountered didn't

PS, the HP Accessory boxes were one piece boxes and had a snap on the front. All of it was in one piece,; both halves of the box, the hinge and the snap. they fit together pretty well but they

Greg, I don't remember if the foam in the HP boxes was glued in or if it was cast in place but I thinnk it was glued in. But it was a very dark gray and almost black color and it was an open cell foam

I checked the DC recovery diodes in the HV supply as listed in other thread (all under the plastic cover and they are ok. Any other suggestions? wrote: