Seibu Check Sum error

Solder

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When the 'Check Sum Error' message appears due to a cart/motherboard region mismatch, does it ONLY say:

Check Sum Error

or is the above message followed by a four digit number?

I ask as I have a Raiden Fighters that is giving a:

Check Sum Error
1086


Changing the code on the cartridge (for Asia, Austria, Italy, Australia, etc) just produces the same error with a different four digit number.

So I'm wondering if this perhaps is NOT a region mismatch?

Also, is there any way to tell the region of a Seibu SPI motherboard just by looking at the board? Is there anything region specific printed on the board or on any of the chips?

Thanks
 
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