Search found 18 matches

by Doz
Sat Sep 18, 2021 2:44 pm
Forum: Hardware
Topic: MZ-700 Blank Key.
Replies: 35
Views: 13609

Re: MZ-700 Blank Key.

Key now replaced. Left it out in the sun for a bit, which is slowly bleaching the case.
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by Doz
Sat Aug 28, 2021 6:09 pm
Forum: Hardware
Topic: MZ-700 Blank Key.
Replies: 35
Views: 13609

Re: MZ-700 Blank Key.

Just a little write up on the 'ole blog.

https://andydoz.blogspot.com/2021/08/sh ... s-and.html

Thanks for listening to my ramblings, and helping me out.
by Doz
Sat Aug 28, 2021 4:37 pm
Forum: Hardware
Topic: MZ-700 Blank Key.
Replies: 35
Views: 13609

Re: MZ-700 Blank Key.

... although it's junk ... Looking at the timing from the data on the tape, it's clear something's not right with the alignment. Listening back to the Basic tape vs the wav on a known good cassette deck, it appears the tape is recorded at the wrong speed. Checking my 8K speed alignment tape against ...
by Doz
Sat Aug 28, 2021 4:08 pm
Forum: Hardware
Topic: MZ-700 Blank Key.
Replies: 35
Views: 13609

Re: MZ-700 Blank Key.

Data is arriving on Pin 12 of the 8255...
by Doz
Sat Aug 28, 2021 3:42 pm
Forum: Hardware
Topic: MZ-700 Blank Key.
Replies: 35
Views: 13609

Re: MZ-700 Blank Key.

Been while, real paying work and a broken ZX Spectrum got in the way. I've set the tape speed (using 8KHz) and the azimuth (using 4KHz , don't have a 3K tape) Scoping up pin 8 of the cassette recorder interface, shows nice data is arriving, and yet I still get intermittant reading of the header, and...
by Doz
Thu Jul 08, 2021 9:52 pm
Forum: Hardware
Topic: MZ-700 Blank Key.
Replies: 35
Views: 13609

Re: MZ-700 Blank Key.

He recorded it on a Nakamichi Dragon I set up and calibrated for him a couple of years ago, it should be good ;) I can't get any further, and I'm going to hit the hay. I'll get out the cal tapes at some time and set the deck up. If your guy is leeds lets you down, give me a shout, there's a very tal...
by Doz
Thu Jul 08, 2021 9:24 pm
Forum: Hardware
Topic: MZ-700 Blank Key.
Replies: 35
Views: 13609

Re: MZ-700 Blank Key.

Hold the press ... I was too hasty ... I'd never got the "press play" thing before ... now I'm getting there !
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by Doz
Thu Jul 08, 2021 9:15 pm
Forum: Hardware
Topic: MZ-700 Blank Key.
Replies: 35
Views: 13609

Re: MZ-700 Blank Key.

I'm sorry, I don't ... OK, got all the 8 caps replaced, repaired the keyboard connector (all the keys work, no one is more surprised than I) , changed the belt and the take-up reel table rubber to get the cassette deck to operate, and I'm now a shade stuck. A while back (and I forget where I got it ...
by Doz
Sun Jul 04, 2021 8:45 pm
Forum: Hardware
Topic: MZ-700 Blank Key.
Replies: 35
Views: 13609

Re: MZ-700 Blank Key.

Most of the RF output transistors I do as a day job have zero thermal relief on the pads, as the tab of the transistor is soldered to a large copper land in lieu of a heatsink. Hit it hard and fast with a metcal and a darn big bit usually results in them coming out without wrecking the board. *usual...
by Doz
Sun Jul 04, 2021 8:41 pm
Forum: Hardware
Topic: MZ-700 Blank Key.
Replies: 35
Views: 13609

Re: MZ-700 Blank Key.

The luxman amp I mentioned a few weeks ago had many ... https://andydoz.blogspot.com/2021/07/luxman-r-1040-repairs-and-restoration.html Must go and see if I have a better TV/monitor somewhere ... I'd rather like to take you up on your earlier offer of a "blank" key & stump if the offer...