| Electronics > Repair |
| What more i can do? |
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| Swake:
Dear fellow electronics tinkerers, I just now discover this thread and it is fantastic how you very systematically approach this repair. The amount of data and information exchanged is impressive. Allow me to point to a probable anomaly you might not yet have noticed. Sorry, I'm not 100% certain of this as I have not yet read all messages: In msg 252 https://www.eevblog.com/forum/repair/what-more-i-can-do/msg5720533/#msg5720533 a screenshot is posted of signal OSC3. The scope is set at 2V per division and the signal is clipping out of the screen meaning it is over 16 Volt ! This does not seem right at all for a 5V TTL based system. |
| 222Lab_Test222:
--- Quote from: Swake on December 18, 2024, 10:36:05 am ---Dear fellow electronics tinkerers, I just now discover this thread and it is fantastic how you very systematically approach this repair. The amount of data and information exchanged is impressive. Allow me to point to a probable anomaly you might not yet have noticed. Sorry, I'm not 100% certain of this as I have not yet read all messages: In msg 252 https://www.eevblog.com/forum/repair/what-more-i-can-do/msg5720533/#msg5720533 a screenshot is posted of signal OSC3. The scope is set at 2V per division and the signal is clipping out of the screen meaning it is over 16 Volt ! This does not seem right at all for a 5V TTL based system. --- End quote --- Shall I redo it? |
| Swake:
Yes please, this would at least confirm the reading. If you could do it on both a good and bad board to compare that would be very nice too. If the 16 V is confirmed then we should try finding out if this is an expected voltage and if not expected where it is coming from. |
| asis:
--- Quote from: squadchannel on December 18, 2024, 09:10:46 am ---if you wanted to run Komatsu machines at all costs, I would replace it with a modern motherboard. since it seems to be just an ISA bus. COM-Express or ATX, ISA bridge and custom pcbs. --- End quote --- This is all good. But how to transfer SW (GUI) control of all hydraulics from the manual remote control and output to the monitor clear pictures of coordinates and corresponding values, i.e. feedback via RS232,485,422? (Reply #151 on: November 13, 2024) We do not yet know what kind of controller is in the power section of the unit. |
| squadchannel:
--- Quote from: Swake on December 18, 2024, 10:36:05 am ---In msg 252 https://www.eevblog.com/forum/repair/what-more-i-can-do/msg5720533/#msg5720533 a screenshot is posted of signal OSC3. The scope is set at 2V per division and the signal is clipping out of the screen meaning it is over 16 Volt ! This does not seem right at all for a 5V TTL based system. --- End quote --- scope is 10x, but perhaps the switch on the probe is set to 1x. :bullshit: --- Quote from: asis on December 18, 2024, 11:47:38 am ---But how to transfer SW (GUI) control of all hydraulics from the manual remote control and output to the monitor clear pictures of coordinates and corresponding values, i.e. feedback via RS232,485,422? --- End quote --- system is obviously running in DOS, which I believe is connected to the hydro control board via a connector the left side of CPU. I don't know what kind of communication bus it is, but if it is just a standardized bus, there is a good chance that it can be migrated. |
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