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In the archive there is another document "7k_PS_currents" describing typical loads, also scanned by Zenith. In my case the total load was 50W. I connected a number of power resistors to the various LV

Hi Max, From my own experiments with a 7704A SMPS I remember that it needed a much heavier load for proper operation. I tried with loads on the HV outputs and also with loads on the raw rectified

Thanks for the tip!

That’s what mine looks like.

In the archive there is a document scanned by Zenith, a specification 155-0067-02, pdf. For pin 13 there shall be two conditions: Logic "0": 0.0 - 0.05 V Logic "1": 0.85 - 10 V Well, if you dare you

The "filter on" position is useless except for very low sweep speeds or manual scanning - not normal operation. I found the same sort of thing when I was refurbishing the switches (Deoxit-treatment)

Following the Goran suggestion, I've shorted to ground pin 2 (FAULT SENSE). The behavior was the same: random burst interspersed with single pulses. Probing with an oscilloscope the pin 13 (Current

Hi all, Interestingly, after acquiring the Pacific Measurements 1038 system, I found the Tekwiki had a reference regarding using the D10 and D11 mainframes. I noticed the D14 which I had wasn't noted

/g/TekScopes/album?id=89780&p=Created,,,20,2,0,0 This is what the display filter does to my screen

I've gotten this 7L5 worked over to where it is mechanically squared up and fits properly in the mainframe. It took a lot of blacksmithing and modifications, but it now looks good, and is apparently

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