z80 cpu alarm and any panel button (such as F1, F2) no response

The Hitachi seiki HC 400 had z80 cpu alarm firstly.

Now realized its pannel buttons no working now.
Does it mean the operation pannel faulty too?

Does anyone know if it can be caused by the z80 cpu alarm?

Thanks,
Bob

Quote:

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Originally Posted by BOBWA

The Hitachi seiki HC 400 had z80 cpu alarm firstly.

Now realized its pannel buttons no working now.
Does it mean the operation pannel faulty too?

Does anyone know if it can be caused by the z80 cpu alarm?

Thanks,
Bob

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It can either be your micon board is faulty or possibly a bad ladder due to corruption or low battery


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Quote:

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Originally Posted by shas595

It can either be your micon board is faulty or possibly a bad ladder due to corruption or low battery fireboy and watergirl

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Thank you. Your reply is so helpful.

Hello I had a bad battery alarm but didn't care about since i have other problems but now nothing works
how do I reload the ladder?