Electronics > Repair

What more i can do?

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222Lab_Test222:

--- Quote from: Harry_22 on November 19, 2024, 10:07:15 pm ---
@222Lab_Test222, could you take out both EPROMS from working board and track the beep signal as usual. Reduce the time/div to detailed view the delay between reset release and beep stop. First with EPROMs and next without.

--- End quote ---

Here it is BUT after EPROMs removed, beep doesn't stop so, how to watch delay?
--With EPROMs
--Delay with beep stop
--Without EPROMs

222Lab_Test222:
....

222Lab_Test222:

--- Quote from: Harry_22 on November 19, 2024, 04:15:36 pm ---2. Check the signal on OSC3 quartz near the chipset.

--- End quote ---

It seems good, BUT if i change more divisions, i couldn't get frequency maybe because it was too dense..
OSC3 is connected to R28 and then to TORNADO Pin 115

Harry_22:
Check the signal Output Enable on working machine with EPROMs at 500us/div.

222Lab_Test222:
Here

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