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Hi Tim! Thanks for your response. I think my question wasn't straightforward - I'm looking for pictures from this special cart combinded with the DEC minicomputer. Holger

From Tim P (UK) I don't know if you have seen the P7001 section on TekWiki - it's under 7000 series, as it uses the 7704A. Lots of pictures of the 'guts' of the P7001 and some stuff on the

Hi Harrison, Yes, the 3x multiplier is U550. For mine, even after I replaced it, I did some testing on it and, at lower voltages, it would triple the input voltage; however, it appeared that at

Hi! I've added an old picture of a Tektronix DPO/DEC PDP 11/05 combination on a 202D cart to the photo section: /g/TekScopes/photo/252847/0 Has one of these machines survived? I'm

I have -151 ready, just waiting for "permission"(?) to upload. Good OCR and size reduced to 196MB with little quality degradation. Non-reduced is also available, almost same size as before. Raymond

In circuit tests of these components will be quite meaningless because of the low impedance components connected to them and the other semiconductors connected across them, such as CR556 across Q556

Barry; When you stated you replaced the multiplier, are you saying you replaced the U550 module? Harrison N1FAM

I hope this can be resolved. Unlocking - OCRing - relooking seems perfectly reasonable. I don't see how this violates whatever agreement. larry

Read out the voltages across C721. Also read out C741 and C761. Used the Beckman HD110 MM with the common to ground. C721; three of four pins read zero, both AC and DC. The fourth pin read 55.5V DC

Hi Harrison, Back in 2017, I worked on my 465M. The following is from an email I sent outlining what I did. Perhaps that will help since it sounds very similar to what you're seeing with yours.

I will check out voltages across C721. Since my last posting I did some reading after which I decided to look closer at the HV Oscillator and HV Regulator circuits. I did an in circuit check of Q556,

I'm afraid I've lost track of what we're trying to do here. As I understand, the main issue is having OCR'ed versions of the files on TekWiki that are available here: http://w140.com/tekwiki/wiki/RPR

This is a wonderful practice and I hope it returns soon. Vaguely related, this is also something I saw recently that seems very hacker friendly and maybe others on the group will enjoy:

If it's the same as the power connector for FET probes, I probably have one for you, could be NOS. Also, if its diameter is bigger than the FET-ones. I have a 4041 in the lab and will be there on

I need to purchase the connector used on the end of the cable of the PD keyboard that attaches to the front panel of the 4041. It looks like a 4-pin LEMO round silver connector. I cannot find this

Sometimes the "service manual" is built into the appliance. In nearly every washer, dryer, dishwasher, frig, microwave, and HVAC thing I've worked on (many dozens of items) over the years, I have

Walter's cable is probably for a word recognizer probe for the 2400 series scopes, which uses the same 6 pin LEMO as the tracking generator cable, but only on one end. BTW, the tracking generator

My problem like this was with a dishwasher. A good one - I’ll name names; it was a Miele. A design feature that was quite good was that the intake valve for the water supply was external and located

With the 32v supply at 30v, the +/-5v readings make perfect sense as the reference for those two regulators is the 32v supply. [30/32x 5] = 4.68v Check the DC and AC voltages across C721. You should

I assume you mean charge level, not wear-out or old age condition? Charge level can be measured (to a certain degree as voltage per cell) by measuring voltage under load but AFAIK, the THS700-series