Electronics > Repair

What more i can do?

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Swake:
Developing a new board will not be easy for sure, but I believe it is do-able. Especially because there is a working sample, so everything can be measured and confirmed. The software is old fashioned 8-bit MS-DOS code. That can probably be re-used as is or in an emulator or worst case reverse engineered if it is talking to the hardware address directly, like in the case of parallel ports of that era. Everything UART based is going to be a non-issue.

There might already be some more modern versions of this Komatsu machine that have a more recent controller. They'll ask a lot of bucks to sell you one of course.

@222Lab_Test222 do you have access to a thermal imaging camera to verify the board, it might give an indication in what area to search.

Swake:

--- Quote ---scope is 10x, but perhaps the switch on the probe is set to 1x. :bullshit:
--- End quote ---

In that case it reads as 1.6V, probably a bit more as it goes out of the screen. That would still not be a very good signal. The signal name OSC3 indicates it has something to do with an oscillator. Have seen a couple crystal oscillators fail recently. The failures were not obvious as in one case there was a signal with a not very good quality and in another case it was off half a megahertz from its specs and the system did not start-up.

squadchannel:

--- Quote from: Swake on December 18, 2024, 12:03:12 pm ---In that case it reads as 1.6V, probably a bit more as it goes out of the screen.

--- End quote ---

ah, yes. |O ouch!

m k:

--- Quote from: 222Lab_Test222 on December 18, 2024, 07:56:19 am ---After the High and Low EROMS swap in Non Working Board.

--- End quote ---

Measured from where?

What say CPU BS8, BS16, BNE0 and BNE1?

asis:
Hi,

Please tell me - what chips are on the FRAM bar (x4).

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