Problem with my new ZXpand+

Discussions about Sinclair ZX80 and ZX81 Hardware
User avatar
Andy Rea
Posts: 1606
Joined: Fri May 09, 2008 2:48 pm
Location: Planet Earth
Contact:

Re: Problem with my new ZXpand+

Post by Andy Rea »

me wonders if this particular ZXpand+ is one that snuck out without that smoothing capacitor ? :roll:

Regards Andy
what's that Smell.... smells like fresh flux and solder fumes...
FrancoisLanciault
Posts: 39
Joined: Thu Jan 18, 2018 11:22 pm

Re: Problem with my new ZXpand+

Post by FrancoisLanciault »

Andy Rea wrote: Mon Feb 19, 2018 5:41 pm me wonders if this particular ZXpand+ is one that snuck out without that smoothing capacitor ? :roll:

Regards Andy
I don't know. Where is that capacitor on the board ?

François
User avatar
Andy Rea
Posts: 1606
Joined: Fri May 09, 2008 2:48 pm
Location: Planet Earth
Contact:

Re: Problem with my new ZXpand+

Post by Andy Rea »

Should be a capacitor near to the regulators I only mention it as my board was missing it, and it exhibited some strange behaviour and worst of all serial comms didn't work properly because of it.

Regards Andy

P.s. Charlie you sly fox..
Didn't realise you'd built in the ability to program the cpld also :mrgreen:
Last edited by Andy Rea on Wed Feb 21, 2018 9:11 pm, edited 1 time in total.
what's that Smell.... smells like fresh flux and solder fumes...
User avatar
Paul
Posts: 1511
Joined: Thu May 27, 2010 8:15 am
Location: Germanys west end

Re: Problem with my new ZXpand+

Post by Paul »

Could you please post a photo of the area with the capacitor that was missing?
Kind regards Paul
In theory, there is no difference between theory and practice. But, in practice, there is.
User avatar
Andy Rea
Posts: 1606
Joined: Fri May 09, 2008 2:48 pm
Location: Planet Earth
Contact:

Re: Problem with my new ZXpand+

Post by Andy Rea »

Image

In centre bottom dark thing just below and to the left of the diamond shaped chip...

Regards Andy
what's that Smell.... smells like fresh flux and solder fumes...
User avatar
1024MAK
Posts: 5100
Joined: Mon Sep 26, 2011 10:56 am
Location: Looking forward to summer in Somerset, UK...

Re: Problem with my new ZXpand+

Post by 1024MAK »

Charlie left off an electrolytic :shock: :roll:

Mark
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp

:!: Standby alert :!:
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb :!:
Looking forward to summer later in the year.
Moggy
Posts: 3231
Joined: Wed Jun 18, 2008 2:00 pm

Re: Problem with my new ZXpand+

Post by Moggy »

1024MAK wrote: Wed Feb 21, 2018 11:17 am Charlie left off an electrolytic :shock: :roll:

Mark
He also forgot the Unicorn and the plough attachment. :lol:
sirmorris
Posts: 2811
Joined: Thu May 08, 2008 5:45 pm

Re: Problem with my new ZXpand+

Post by sirmorris »

:roll:
User avatar
Paul
Posts: 1511
Joined: Thu May 27, 2010 8:15 am
Location: Germanys west end

Re: Problem with my new ZXpand+

Post by Paul »

Andy Rea wrote: Wed Feb 21, 2018 11:03 am Image

In centre bottom dark thing just below and to the left of the diamond shaped chip...

Regards Andy
In order to draw the attention from sirmorris ;)
The diamond is actually a square isn't it?
I don't own a diamond but I have some squares for comparison :ugeek:
In theory, there is no difference between theory and practice. But, in practice, there is.
User avatar
Andy Rea
Posts: 1606
Joined: Fri May 09, 2008 2:48 pm
Location: Planet Earth
Contact:

Re: Problem with my new ZXpand+

Post by Andy Rea »

Its all a matter of perspective :lol:
what's that Smell.... smells like fresh flux and solder fumes...
Post Reply