Hi, Remove, clean an reseat the hybrid circuits. Look at the details in the extended diagnostics. If it is one channel that fails, you can swap the ICs to find if any of them id bad. Although I'm not

Hi, First see what the extended diagnostics says. Then the usual suspects: Power supply voltages and ripple. Remove the hybrids from their socket, clean the contacts a reseat then. If that does not he

Hi, Apparently posting this in the ESR meter thread was a no-no and got caught by moderation, so I repeat the important part here if anyone is interested in some collaboration. " Good that you mention

Hi, Yes, the current offerings from China and elsewhere on PCBs just make it practically nonsensical to DIY PCBs at home. It was a fantastic feeling when I first ordered my first plated hole, double s

Hi, There was a change sometime, when Tek changed from external battery to internal, built into the nvram. It is actully quite easy to patch en external battery into it. See my earlier post on this: h

Hi, Check the psu caps on the secondary side, especially the one for the startup supply for the pwm circuit. I had a 2430, a 2440 and a 2432 all having these caps gone dead, some even leaked and the s

Hi, Yup, they are quite capable power supplies, but due to the resolution of the voltage and current setting and sensing, they would mostly be only useful for power devices. You could certainly not do

Hi, Yes, this could be battery related. First of all check if it is not attenuator and trigger ext cal, that is missing. If it is not calibrated, it will still show up in the self test or the extended

Hi, Yes, i think we are on the same page now. I cas share some of my experiences. The attenuator gain and the trigger adjustments only require a couple of DC voltages. Given that the scope itself has

Hi, There are 3 calibration task for the 2440. The self cal and the ext cal and the procedure described in the adjustment section of the SM. The adjustment section ha two distinct part. One is the dis

Hi, I have replaced the nvram in my 2440, without saving (it actually lost the content) did a recal according to the service manual and works just fine and meets the performance specs. For test I actu

Hi, No, there is no other writable store in the instrument what i know about, and there doesn't seem to be any on the schematics. I think what the SM says here is when you press the button, it recalcu

Hi, I scored a nice AWG 2021, in a rackmont setup. I had to do some metal bending, as it was dropped at one time, but it is working now nicely and has all the nice options of 2nd channel and the FFT e

Hi, If you only loose the content of the nvram then a self cal and ext cal should restore the instrument into cal. For that you only need DC levels (attenuator and trigger level cal) and an about 100k

Hi, With the 2440 don't worry. You don't have to save the content of the nvram. Simply do a self cal and an ext cal on the scope and that is it to return to full working condition. Fortunately for the

Hi, There are two versions. Older units had a separate lithium battery. Newer versions had the Dallas NVRAM chips, with built in batter. Neither of them are rechargeable. In practice this does not mat

Hi, Yes, definitely. The FPP error is 99% because of the nvram battery failed an lost the calibration. All other fails are likely a result of it. You can verify it by going into the extended diagnosti

Hi, You should check if the CRT bias is correctly set. See the adjustments section in the service manual for that. Once it is set properly, I don't see any excessive brightness. Szabolcs Andrew Tonkin

Hi, You can use heat-cure epoxy such as this one: https://www.digikey.com/product-detail/en/mg-chemicals/9300-10ML/473-1293-ND/8582355. You need to bake the board for the epoxy to cure. I would never

Hi, No, the Tekmate motherboard supports 1.44 drives and I'm pretty sure that those are the original Teac drives, which are capable of 1.44. I did try 700kb disks too, though. Anyway, puzzling and I'l