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I recently acquired a 7934, and was stepping thru the service manual I downloaded from Tekwiki. Its missing pages 6-22 and 6-23 and every copy I could find was also missing the same pages. Anyone

Craig, I think I have most of the equipment listed are either in the Tek service manual or the Tek-derived US Army service manual, TM-09078B-40/2, which gives non-Tek equipment-alternatives like the

Ron, Well the question marks are definite need for calibration. It is a very time consuming process which will take several hours. Like spending all day on Saturday without any distractions. The

Hello H?kan, Thank you for the information! I will take it into account. Until now the scope is working perfectly. I only got the annoying message in the error log. Regards, Wamor

Craig, I tried TEK2465B Serial B066505 EAROM.BIN from the groups.io website, and the unit powered up without Test 04 Fail! Only two traces and a few extra question marks on the readout, though. I

As far as I know TDS620 and TDS640 don't share the same Firmware although the version numbers are the same. /H?kan

Hello Peter, Thank you for your quick response!! I do have the schematics of the TDS520 so I can locate U3 and U4 and the corresponding resistors on my TDS620 (=>TDS640). I will open my scope

Andy, In the hv section, see if the .01mfd condensers are ceramic or tubular. If the latter, replace with film or ceramic types. You can increase the capacitance if you want to say .015mfd. The

Hi Wamor, Some years ago i started to fill a table with model's IDs. Maybe, is your case: the Processor board ID does not correspond to Acq configuration. See U3, U4 on Proc. board. This two are

Hello everybody, I managed to upgrade my TDS620 to a TDS640 by changing resistors on the acquisition-board. I now have 4 channels active and this is working fine and the scope reports that it is a

I changed R803 the 56k anode resistor for V814 to 68k to reduce V800's screen grid voltage, & adjusted the EHT to minimum. The CRT display is a lot less bright but I still have no intensity adj and

Ron, Ok now try to clear 04 diagnostic with EXER 3 as described in other post I sent. Calibration may need to be done if values aren’t correct.

Craig, all pinouts of U2101 have intact connection to the next component and the resistor ladder resistors ohm correctly including connection to +10V Ref. The C2010 measures 15.8 ?F. pac085, I

Hi all, I had a breakthrough over the weekend with my balky 492P. Rapping the VR module with a rubber screwdriver handle brought back the missing ~20 dBm of amplitude in fits and starts, so I

I appreciate it H?kan. Information on the rack mount versions of the 500 series is pretty hard to come by.

Yes, I have a Racal Dana 1998 with higher resolution, high stability option and GPSDO. I would not bother with messing with option 1E (even if it seems easy to do) if it was just for 8 digit

That’s awesome, Craig! Greatly appreciated. I was thinking it was U2550 on schematic <1>, like a dope. I’ll run through it later tonight. Thx, Ron

I'd like to see more discussion about using a Pi, to program the FRAM. The logic levels... AFAIK.. are compatible. Could do it in Python. Why not? -- Roy Thistle

Ron, I have added pictures to photo area albums. Review this album. /g/TekScopes/album?id=301356 Craig

Hi Giueppe, My comments are below. I agree, WR probe may not be useful especially if you have a LA. With WR option back case have a BNC for trigger output. It is possible to re-wire it for 10MHz