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No variac, I'm using normal line voltage (230 V). Max

Not that specific component failures on mine will address your issue, but about 17 years ago I replaced these shorted components. (Not all in the same incident) CR1534 killed beam C581 - 22uF killed

Yeah, that's the one shown in the old thread. I was thinking more along the lines of the hood shown on Mr. Carlson's 565 in this video: https://www.youtube.com/watch?v=v3Jv2_pQ86o Does something

1038-N10 Switches The switches on the N10 are a huge problem because the footprint and shaft do not match anything else. I was able to buy one box of replacement switches from Gigatronics (they

Thanks for the several cautions and suggestions. I did look for shorted caps as I had several tantalums go previously - but I replaced them all a couple of years ago and it had been running fine.

Hi Max, I checked that P83 can be left disconnected, like in many previous versions of power supplies. At the LV board there are resistors R76, R96 and R132 for this between the sense lines and the

Had similar problems years ago and the problem was those little tants going short. Rather hazy on the details now, but I remember how infuriating those power supply interlocking systems were. With

Listed in the 1970 catalogue (and probably others). USD 7.00 Apparently not only fits the 7000 series but also the 601, 602 and 528 Craig

Hi Lorenzo, don't disable the protection, it could damage your supply. Maybe you should disconnect the -5V regulator from its load and use a lab power-supply to provide the -5V to the loaad. Set the

If you really have a short circuit from -5V to ground (eg a failed tantalum capacitor) you don't need to power up the scope, it should be obvious with a resistance measurement. Schematic <17> shows

I have one of these. I got it off eBay and it seems no-one else was interested, as I got it for the starting price of 99 pence (UK). They seem to be very rare items and bears a part-number

Hi Albert, You're probably right, I didn't analyze the feedback/offset circuit in fine detail. My conclusion about the offset was mostly based on what I observed while probing around the head. My 7S12

I have posted in eevblog also thanks a lot for the inputs

Hi Ed, Did you try switching off digital storage? If there is a fault in it (and it's quite a complex circuit), it would interrupt the signal path. My unit was such a case (was working only with DS

I found this old thread (/g/TekScopes/message/152935?p=,,,20,0,0,0::Created,,crt+hood+,20,2,0,28557610) that showed the "batman" style viewing hood. While I can see the utility of

Hello, I have a 1038-D14 and 1038-N10 combination, with 3 matching powersensors. Also have the operating and service manual for the D14A and N10 (already scanned), please indicate how to transfer

Whilst looking through my test equipment inventory a bit of trivia came to mind regarding a unit that I had acquired back in the late 90s off of surplus. It is still tucked away in storage and I had

O.K Albert, . I've found theDennis' documents you mentioned on how to build a complete dummy supply load for the 7104/7854 SMPS. I will buy the necessary resistors... :-/ BUT the document only

My Tek485 has been sidelined for some months with a power supply issue - the inverter keeps cycling on/off. I've fixed similar issues a few times but this one has me foxed. Balance node shows a short

In cases where you need to measure a transistor (or other device) at extremely low currents, electrical noise or hum pickup and inter-electrode capacitance can become so great it completely swamps the