Sharp MZ

Well, I tried checking these things with a scope, but regardless of which pins I touch (for all components on the board), all I get is the 5v sine wave and that's it!

Very weird!

Or do I need a logic analyser or a frequency counter for these simple tests?

This is great, thanks everyone, I suspected that this will be a scope job. I'll get cracking on all of these items next weekend and will keep you posted. On a slightly different track, I downloaded the service manual but yet to look at it. Ahead of time, can someone please quickly confirm what the t...

Thank you both. Pacman, the screen displays nothing. Is the IC5H you refer to a circuit diagram reference or is it noted on the motherboard? hlide, yes no beep at any volume and no video. Also no video with the Z80 removed. I'll test the chip shortly. What do you mean by /RESET and /M1 please? I'm n...

Hi Everyone first post. I got an MZ-711 model that let off the magic smoke on first switch-on. After recapping the PSU (the stuffed RIFAs and the filters), I finally switched it on, but the computer is not booting. The red light on the keyboard is on. The tape drive is working. However there is no b...