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Hi Nenad, I tend to disagree with your analysis. The feedback is not primarily intended to keep the base of Q36 at a constant DC level. Within limits Q36 doesn't care. The purpose is to have the

Hi, I worked on this PS in a 7904 some years ago. There are two overload conditions, over/under voltage and over current. Either shall turn the supply off. However, I think there is a third condition

I Have model 3 I can send you. What do you wan to pay? -- John

These scopes are not a good fit for a hack job if you want extended life. I recommend you get it to an experienced tech that understands these units and can make successful repairs without creating

When you replaced the bad capacitors, were the originals of the can style with several ground tabs? Did you restore all those ground connections by using caps of the same type, or otherwise restore

Ok, perhaps this i

Steph, I'm working with only boards A23 and A12. The low voltage regulator board A22 was disconnected from the rest of power supply, and there are no other connections. I pulled out connectors P52,P50

Is another test-bed link needed re Fault Sense signal P83-4? Suggest trace the signal path. [It has a convoluted journey through Main Interface (sheet 3 where renamed "HV sense"), then through

Seems there are some Fab Labs, Hacker Space's or Maker Space's in the area that may be able to assist. Maybe https://www.noisebridge.net/ is a place to visit and see who can assist. I'm sure there are

Situation normal with the Tek switchers AKA "High efficiency power supply". There are three that just sit here having defeated all attempts at fixing. Craig

I got this 7854 to repair. Main symptom:it blows the 4A main fuse. After several tests and measurements, the culprit was found in one of the two leveling capacitors (C16), 950uF 200V with a serious

Thank a lot for the input will try eevblog

On Sun, 21 Apr 2019 05:33:05 -0700, you wrote: >On Wed, Apr 17, 2019 at 07:55 AM, Harvey White wrote: > >> >> On Wed, 17 Apr 2019 07:06:19 -0700, you wrote: >> >> >I have been given this tool. I have

Since the 2467B is mostly software driven, and the 710x series is hardware without a bit of software, I can see the mechanisms being quite different. The idea, though, is much the same. Not at all

On Wed, Apr 17, 2019 at 07:55 AM, Harvey White wrote: > > On Wed, 17 Apr 2019 07:06:19 -0700, you wrote: > > >I have been given this tool. I have a Tek 2246A and a Hitachi scope already. > What can I

The 2467B will go into a screen saver mode after about 5 minutes of inactivity (eg. no knob motion). It also will move the display readout positions every so often to prevent burn-in. The counters for

The 2467B and 7104 most assuredly do *not* have the same CRT! There is a good 6 inches of difference. They both have a micro channel plate (MCP) image intensifier, but they are not the same CRT. By

I believe that the last list price for that TD from Tek was $800. And that was decades ago. The only other place that diode is used, is in the 7T11 sampling timebase. So yes - read the manual.

If you haven't tried the EEV Blog Forum, you can post there too. There are some threads about the 2467B on that forum too. Best regards and wishes. Roy

Hi All: I remember something about an limiter circuit to limit the anode current, when driving the CRT hard (displaying a bright trace). That circuit was supposed to keep the maximum brightness to a