On 10 May 99 at 19:06, Tony Duell wrote:
> > First thing is to see if the built-in video terminal works and go from
> > there. There is a simple cable running between the Terminal Logic Board and
> > the CPU Board which carries the RS-232 signal for communication. All my
>
> Yes, but whatever the CPU board decides to send on its end of the cable,
> the terminal logic board will still do _something_... If you're worried
> about that, though, just pull out the cable (the 0.1" spacing one on the
> disk drive side of the machine between the terminal logic board and the
> CPU board).
>
> Incidentally, the rule for taking one of these to bits is 'think what
> order the options were added and remove the latest one first'. In other
> words start by removing the disk drive and its screening can. Then remove
> the daughterboards and their cables. Then the CPU board. And finally the
> terminal logic board.
>
> > H/Z89 docs are buried somewhare in this danged house as we've recently
> > moved. No time to sort and catagorize many things yet. It's gridlock almost
> > like the old house was :( Knowing our resident archivist, Tony Duell, I
> > bet he will have docs in his collection and could take it from here. If he
>
> Hey, I'm not an archivist :-). I don't stick manuals on shelves never to
> be seen again. My manuals are 'working manuals'. I read them. I use them...
>
> But yes, I do seem to have accumulated a rediculous number of obscure
> service manuals...
>
> > by chance doesn't have the docs at hand, either someone else here could
>
> I have the Z-90 hardware manual here. I am not sure what you call it, it
> came with the machine, so I guess it's a user manual, but it's got full
> schematics, etc and more info than some service manuals that I've seen.
>
> My method of fixing this would be :
>
> 1) Check/repair the PSU on the main chassis (see yesterday's message for
> details of voltages)
> 2) Check/repair PSU regulators on the terminal logic card so that is
> getting the right voltages
> 3) Get the terminal logic card working well enough to give the Beep at
> power-on. Then see if it is producing sync/video signals.
> 4) If necessary repair the monitor analogue board so that the screen
> starts displaying things.
> 5) Then start sorting out the CPU board.
>
> Let me know how you get on with the PSU tests...
>
> -tony
>
You're a rotten guy Tony. Even if I'm not into fixing it right now you're
going to force me into it. Be it henceforth be noticed that I L Walker
relinquish control over one H89 computer and offer it up into common
domaine. Take that guilt merchant !
(but I'll still save the tips, just in case )
ciao larry
lwalker_at_interlog.com
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Received on Mon May 10 1999 - 20:15:45 BST