Electronics > Repair
What more i can do?
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222Lab_Test222:

--- Quote from: Harry_22 on November 21, 2024, 06:26:20 am ---
It would be very good to know the chip names from the back side.

--- End quote ---

I guess they are bunch of buffers and FFs.
From Top left,
IC92 74F04,  IC10 IC11 IC12 IC13  74LS245,

Bottom Left
IC29 IC91 74LS373, IC4 IC90 74LS244, IC55 74LS245, IC65 74F30,

Bottom right
IC43 IC44 74AC04
Harry_22:

--- Quote from: 222Lab_Test222 on November 21, 2024, 07:07:40 am ---What is a signal monitored here? CLK?

As it is connected to the IC5 IC, i guess the output of IC5 leads to this, not sure though

--- End quote ---
Ok. Take the datasheet on IC5 and mark the involved pins. Output that goes to LED (via resistor) and corresponded input that goes to processor pin (what pin?)

Could you catch two different traces of this signal (Green LED signal on non-working board). This is very important to see that they are different.
Poroit:
G'day _Test222,

Sorry but none of my contacts at Komatsu Australia (KMA) have been able find any information on the Ironmole.

I assume you contacted KMJ directly.
Harry_22:
By the way, there was a time when Japanese built protection into their electronic equipment. I learned this legend from the gray beards. I was thinking about it and suddenly saw some phenomenon (see the picture).
This is the other side of digitalization.

So we start almost from scratch.

Please make out this needle. To do this reduce time/division ratio.
With the same sweep time look again at OE, some remarkable Address and Data signals.
Submit here the results. It is up to you.

Could you also confirm that the fault-start results are different time to time.
222Lab_Test222:

--- Quote from: Harry_22 on November 21, 2024, 07:16:45 am ---

Could you catch two different traces of this signal (Green LED signal on non-working board). This is very important to see that they are different.

--- End quote ---

Here,
1st is RED led, same on both board
2nd is Green led Glow
3rd is no glow
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