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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

Hi Dennis, Thanks for the feedback. Any ideas regarding the 5114 - D14 mainframe; why that number was skipped or who'd be the designers or subject matter expert(s) regarding that line of equipment?

Hi, The 5000 series mainframes were, in part, designed to be low cost products. As such they were very attractive to other manufacturers as the display portion of the product they developed. Often,

More. You can check diodes by making differential measurements across the diode. I found two bad power diodes this way. You can do this measurement while the unit is in tic mode. I found the diodes

You need a load of about 50W, possibly equally shared between positive and negative outputs. Either on the raw voltages or after the regulator board. You need to check all caps and diodes on the

Hi Max, Well, I didn't say that the load MUST be distributed. For me reasons to do so were that I could use available 5 W and 10 W resistors and that I wasn't always sure about the maximum current an

To G?ran: OK, shorted pin 13 to ground. Still same result: the SMPS refuses to starts and ticks herratically. I've checked the signal across A and K of Q30 (the PUT): it fires up every 20 msec (I

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