| Electronics > Repair |
| What more i can do? |
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| asis:
I can't imagine how deep we'll go into this topic, it seems crazy to me, but it's time to move on to some fragments of circuitry. There will be more mutual understanding. - I hope for your help. |
| 222Lab_Test222:
--- Quote from: asis on December 25, 2024, 04:51:36 am ---I can't imagine how deep we'll go into this topic, it seems crazy to me, but it's time to move on to some fragments of circuitry. There will be more mutual understanding. - I hope for your help. --- End quote --- I am all in. |
| Swake:
@222Lab_Test222 Would you please redo the measurement of OSC3 near the TORNADO chip that you already did in message 252 https://www.eevblog.com/forum/repair/what-more-i-can-do/msg5720533/#msg5720533 In that image the frequency measured by the scope is correct (2.45MHz) but the voltage is very high (over 16 Volt). As someone else pointed out, it might have been because your probe was set to 1x instead of 10x. Let's make sure things are normal here. |
| m k:
--- Quote from: 222Lab_Test222 on December 25, 2024, 12:34:37 am --- --- Quote from: m k on December 18, 2024, 03:18:33 pm --- What say CPU BS8, BS16, BNE0 and BNE1? --- End quote --- Here are signals for Non-Working Board --- End quote --- Those are fine. --- Quote from: 222Lab_Test222 on December 25, 2024, 12:39:26 am --- --- Quote from: m k on December 20, 2024, 03:31:57 pm ---Next we can check the combined ROM image and see that F800 has F800 FA (CLI) F801 E4 (IN) F802 35 (port)(irq controller) F803 A8 (test) So completely rational start of a code. --- End quote --- How we can perform this? --- End quote --- It's time consuming without a logic analyzer and not very informative yet. We know that from CPU's point of view the ROM data is wrong, so the above is not happening. --- 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 --- How did you do it exactly, put low ROM to high socket and high ROM to low socket? |
| 222Lab_Test222:
--- Quote from: m k on December 25, 2024, 03:43:28 pm --- How did you do it exactly, put low ROM to high socket and high ROM to low socket? --- End quote --- Yes like that. |
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