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My 455M had a failed HV multiplier. It was blowing the fuse same as your 465M. It has a 1.5 times multiplier as part of U550 this is confirmed in the Tektronix Yellow covered X Ref catalog. I built a

Using the diode test method I found what I believed to be a bad Q552 transistor. At the same time F558 was blowing. I have replaced Q552. But F558 does indeed blow every time the power on switch is

Monty: That 840 Error Message means the drive belt came off the rollers and the tape is not moving. The tapes are not attached on either end as I am sure you are well aware. There are a series of

I have captured the four CPU board EPROMs and two SCSI Option 03 board EPROMs and posted them on my github repository: **[Tektronix-4041-GPIB-Controller/4041

I just added a photo of the new 4041 CPU board that only has two System EPROMs and two Option 10 EPROMs to my 4041 TekScopes photo album **[New 4041 CPU board with only four

Is this the one that had an onion skin thermal printer and when you printed the screen, a horizontal line when from top to bottom like it was scanning the inside of the CRT? At Aerotech labs in the

I just received my EBAY purchase of another 4041 - this time with the DDU disk drive unit attached. The auction indicated they were working at the time they were taken out of service - I'm not so sure

There is a group [email protected], dedicated to HP equipments. Warm Regards,

The digital board supply is only accessible if you remove all the logic boards - it hides away at the front of the 'scope to the left (as viewed from the front) of the logic boards. You can't get at

HI! The P7001 digitizer is relatively rare, thats true. But I'm wondering more about the always missing minicomputers. I think 90% of the overall functionality of the DPO system sits in the computer -

Egge, You're correct, of course; I wonder why so few of them are left?? I have the only one I've ever seen locally (core memory). -Dave

Hi Dave, You mean x010101 (the first of the production). I also have P7001 Manuals referring to B07xxxx and B09xxxx SN's. Greetings, Egge Siert

Alright, thanks for the info Dave. I checked everything in table 4-4 as well as any other areas that had a marked voltage test point that I could see (definitely could have missed some) on A22 (The LV

That 108 is the pre-regulator voltage. I don't think that ripple is of great concern. There's not a lot of bulk capacitance on the 108 because it is the feedback to the inverter controller (A12U75),

Alright I've checked all the power supply test points I knew the location of (A12,A22,A17) Except I didn't get that digital supply David mentioned, which I'm not sure where the test points are, how to

But don't the Tek part numbers sequences typically start at x100001?? To me, that means 772 were sold before the update, and I doubt they sold many P7001s after 1980; they were getting fairly old at

Martin - I'm no 7854 expert, but I've been poking around in a few lately, and the manual has been my bedtime reading material, so I know just enough to be dangerous. That being said, a few thoughts:

Right - I don't think it knows if it's good data or bad data, only that it got filled up. I'm haven't figured out how yet, still making my way through the manual. I know it's also counting sweeps, but

Hi Tim, I have a P7001 Manual with dated MCI (06-17-80) for SN B100773 and above. Thus it seems thousands are sold. Greetings, Egge Siert

Hi Albert, That's when the 'scope is healthy. In the video, it seems that acquisition proceeds to a certain stage, then sort of repeats, as can be seen in the periodicity of the pseudo-random garbling