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 reloaded the original read of the Dallas DS1225Y SRAM, and was back to 4 traces but with many question marks on the readout. Per your suggestion, I went through the EXER 03 procedure using the original DS1225 read SRAM. I was then able to get out of diagnostic mode, but upon power-up, I’m back in it again with Test 04 Fail.
My interpretation of all this is that the original read was somehow corrupted, and the unit is functioning. Which means I should have photographed the SRAM data pages.
I recently recapped a Tek TM503 and have another working 2565B. I also have supposedly working PG506 and TM501 generators, as well as a WaveTek 145 & a 191 Pulse Generator. I guess I get to learn how to calibrate, unless you have another suggestion.
Thx, Ron
