If you do that, then you must also replace the U400 and U410 EPROMs with the -02 versions as well, and you must also remove your rev -00 FPLA. You will end up with something that sort-of works

If I get passed this display board problem, I'll be replacing all of them with the patched images, since we know the ROMS are prone to failure. It's great for quick validation though. Yeah, I saw

Gary made a typo and is referring to the 7104, circuit board A14: U232 and U432 are Tek 155-0173-00 U274, U474 and U492 are Tek 155-0175-00 Nothing on these on TekWiki AFAICS Raymond

I am glad that you were able to fix your ROM board. It is also very nice that you were able to preserve most of the original components, and only replace the one IC that had actually failed. Success!

A 7401 would translate to a very slow non-store 7K with a single slot, very uncommon indeed! The chips you're looking for are 155-0173 -XX and 155-0175-XX. I didn't find anything on them on TekWiki,

That fits the pattern of most tektronix part numbers. The two digit suffix tends to indicate a change in process, or manufacture of the part... but not in functionality. I would expect the -00 was a

Hi Paul, This is good news. Your confirmation, combined with the -02 patch ROM contents being a superset of the -00 patch ROM (every mask ROM patch in the -00 patch ROM is also present in the -02

Successful Failure: After a few false starts, I managed to burn a MCM68766C35 with the -00 image on the Wiki, verified it, and re-installed the board. The new pattern of indicator status lights

A14 is the Trigger Selector Board in the 7104. The ICs have a large brownish plastic or bakelite mounting shell. The Service Manual shows limited input and output circuitry with no description as to

I apologize for giving the wrong scope number. I meant Tek 7104. This Corona Virus threat has me on edge and I have not been thinking straight. I must go to work whether I like it or not. Sorry for

Albert, The TEK Cross ref list shows 151-0614-00 as something called a D156. 151-0474-00 equals MRF511 and 151-0474-01 equals 2N5947. Since the schematic is almost identical between the early

Hi! I am interested in a working THS720 or THS730, with accessories and carrying case. Ideally, in Europe. Please feel free to contact me off-list. --MB

Hi Albert, Thank you for pointing at this wealth of information on tekwiki, I had found plenty of information already but not this specific page. While you people keep guessing what is inside the

Gary, Since this is a very uncommon scope, and since the "U" numbers are assigned by the IC's placement on a PC Board I can't help you and neither can anyone else except for a few people who might

" For any who may be interested, I finally heard back from Tek support and was able to purchase a set of the original installation (Win 2K and custom drivers) disks for about $90." Too cool. I think

For any who may be interested, I finally heard back from Tek support and was able to purchase a set of the original installation (Win 2K and custom drivers) disks for about $90. Hal

Does anyone know where I can get the schematic for the custom ICs used in the Tek 7401 Board 14 ??? U232 U274 U432 U474 U492

Dan - I just got this 30 year old EPROM reader up and running and was able to get data off all 4 mask ROMS. I diff'd them against what's on the Tek Wiki, and only saw differences on U210

This patent refers to the 2N5947 and the PT5707 only as examples of devices with limitations that the invention avoids, and what the effect is of using the two part numbers in a discrete

Rajesh, the issue here is the mystery of what's inside Albert's transistor. The typical RF transistors in this package style have two emitter leads, but they are tied together inside, so there is