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View Full Version : Help repairing a Sanyo MBC-200



matsondawson
May 13th, 2011, 11:42 PM
I picked up a Sanyo MBC-200 out of a friends garage.
I think it's similar to an MBC-1250, with twin Z80's and 128k and then some of RAM.
When turned on it shows a screen full of static, and drive A spins continuously.
I've replaced both CPU's and reseated all RAM.
When I run a logic analyser over what I think is the main CPU in the center, it looks to be doing DRAM refreshes (which is weird as there is no DRAM), but nothing else.
There's no beeps, and putting a disk in the drive does nothing.
The keyboard's small and graph key leds toggle, but I suspect that is controlled by the keyboard.

Any ideas?

matsondawson
May 15th, 2011, 11:08 PM
As another question, has anyone heard of an MBC-200 before?

Chuck(G)
May 16th, 2011, 07:44 AM
I've heard of an MBC-100, but only that. Every other Z80 Sanyo box I've run into has been >MBC-1000.

matsondawson
May 17th, 2011, 10:42 PM
Hmm, I'm getting the feeling maybe 100's are japan versions of 1100's and 200's are japan versions of 1200's