Sharp MZ

Hi,

Received an LH0080A Z80 today and popped it in. No change unfortunately. So presuming that the original Z80 is alright?

Where would be the next thing to check? Is it worth getting a simple scope to do some deeper diagnostics?

Rowan

I only have a simple logic probe unfortunately so I can't tell.

Hi, Got some time this evening to have a look. - Tried the manual reset, no difference. - Z80 pin 26 probed as low. - Probe showed pulse on Z80 pin 6, also on IC35 pin 9 and 11. Source a Z80, or are there further tests? Is there a difference between the currently fitted Sharp LH0080 Z80 and the comm...

Hi, Thanks for getting back to me.

I'll check this out later and report back!

Cheers

Hi all, I'm new to this forum and was hoping to get some help identifying how to sort this fault. The machine had been working perfectly until recently when the PSU failed. I traced this to a bad tantalum cap which was replaced. However now the machine displays garbage text on the screen when you tu...