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874 connectors were pretty much universally used on GR RF instruments manufactured after 1948. -- Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg,

Hi All: Apologies for taking so long to respond; but, I finally found my stash of GR connectors (and a couple 500/7000 plugins using them too)… so I could have a look at and 874... in "the flesh" so

Hi Michael Just a hint, Put a 60W to 100W incandescent light bulb in series with the live mains wire, this will protect the power supply against most accidents. Most but not all SMPSU's will

Chuck, Awesome. This is EXACTLY what I am looking for. Not someone to tell me "replace this part and it will work, but just point me to a general area. Funny, My brother (very knowledgeable in

Hi Michael, Would it be possible for you to post the photographs of front and back of the LV A5 board? A good visibility of component numbers would be desirable. If it is difficult to take the LV

I have fixed many of this design power supply. They are typically badge engineered by name brand companies, but are made in China by GoodWill company. They are made up of three basic boards, one is

I will give you the million dollar hint: All mains powered SMPS supplies need to source a tiny amount of power to the PWM control circuitry so that the supply can start to make voltage. Typically,

I have a CPS250 (5v 2A, dual 0-20 500ma) that arrived broken (bought it knowing it didn't work, but didn't pay much). IIRC, the design clicks in different voltage taps on the transformer to

George, I appreciate your input! I am wanting to learn more about SMPS, so no time like the present. I am aware of the lethal voltages and am willing to take that risk. I also understand that I

Hi Chuck I agree with you except that I am old enough to remember things like projection TV's where the EHT was not low current. I have also worked on high voltage electrostatic clean room filters

Hi George, There are rules, and there are rules. Behavior when working on a 40KV power line is very different than behavior when working on a 40KV CRT anode supply. One can source enough current to

Hi Ed, Ed Breya via Groups.Io wrote: No, only the astigmatism pot has to be moved... resulting in a brand new value on the astigmatism grid for optimum focus. Basically, the astigmatism control

At the risk of sounding like an advertisement, I'll offer my KISS-488 as an alternative way to "put the GPIB connector to good use". Dave's beautiful YouTube video (

Hi Michael Most instrument SMPSU's will not switch on without a load being present on the primary low voltage supply as this is the only directly regulated one by the switching stage. My best

Michael,I could find nothing visibly wrong with the caps on the PSU but the advice of several members all said the same , replace regardless as its a common fault . I replaced all the high value

Many such multiple-output supplies are designed around an assumption of a certain minimum amount of current flow (loading) out of the main output. As you describe it, that could still be the

Brian, Seems we are in the same boat! This instrument has been flawless for over 2 years. All the sudden, it quits. . . . Sickening! I got this instrument from E-bay for $100, including shipping,

Ravi, I appreciate your kind reply. Let me expand on my previous comments in that I have no experience repairing SMPS, so any help or suggestion is invaluable. These things are "clear as mud" to

Michael , I had this problem with a TDS420A that I bought on ebay . I feel I should join this discussion as so far no-one has suggested the cure that worked for mine . The first thing that anyone

Michael, Thank you for clarifying that the supply cable was swapped and tested. I did not see mention of it earlier and therefore suggested my thought about supply cable. How many low voltages (and