Electronics > Repair
TDS3014 adventures
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james_s:
It's possible of course, but virtually every time I have suspected some expensive, difficult to test and difficult to replace part that has turned out to not be the case. Given the scope mostly works, the CPU itself is one of the last things I'd suspect.
giosif:
I get what you are saying but, then, for the Ethernet not to be working...
As far as I can tell, the network data goes from the board with the Ethernet connector straight to the main CPU.
Of course, there is the possibility something is broken on the board with the Ethernet connector but, to the degree I could check it (it can be easily powered outside the scope), all seemed ok with it.
(Also, forgot to mention on Ethernet troubleshooting, I tried both straight and crossover UTP cables).

The above said, I will for now treat the two main issues as unrelated and for the fault with the network connectivity as unlikely to be caused by a broken CPU.
Need to think of next steps to troubleshoot the network connectivity problem...
james_s:
It could be something with the address decoding to select peripherals, that could break ethernet and one of the channels depending on how the address is laid out. It could be a fault in the ROM or RAM, it could be two completely unrelated faults, there are many different things it could be. Is the CPU address bus buffered or do address likes from the CPU connect directly from the CPU itself to the expansion connector? Given the way computers work, a fault in the CPU will normally cause much more serious problems, if an address like is stuck then large swaths of memory and IO will be inaccessible, if any of the lines on the data bus are not functioning then almost nothing will work properly.
Galen:
My TDS3014B and 3012B, all can't make Ethernet work. Using  crossover cable, The computer said "connected, but I ping the scope, no reply.  The scope looks good for all other functions, only the network, always fail, even I fix the IP at both side. no clue what's wrong.
madao:
spare parts  TDS3012 is arrivied  for  repair of gosif's  TDS3014B and my  TDS3014.

Sad,   only PSU is dead,   it runs good with  external  15V .  SPC  passed.
I make  think about it...

greetings
matt
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