840z Zif Adaptor Problem

[muddy0409]

Dunno, too long ago to remeber.

[Darrel Taylor]

Which PIC are you using?
And which way did you plug it in?

See ...
http://www.crownhill.co.uk/images/pr...-datasheet.jpg
<br>

[-Dan-]

Which PIC are you using?
And which way did you plug it in?

See ...
http://www.crownhill.co.uk/images/pr...-datasheet.jpg
<br>

the ribbon cable is on the right 10 pin header

pic is in the zif socket correctly

contacted melabs and they said the led should not come on when i connect the adaptor

they said its probably a faulty adaptor

just my luck!

[Darrel Taylor]

I hate to disagree with melabs support, ... but ...
I just have a hard time believing that.

There's nothing on the adapter itself that can fail.
Unless there's some burnt traces or something. (which you would probably see)

You never did answer the questions ...

Which PIC are you using?
Which way did you plug it in?

It's one thing to say it's correct, but for someone else to help troubleshoot, it makes it easier to know the actual details, so that the problem can be dismissed.

Assuming that the answer to both questions is indeed "They are the correct way".
I would be more likely to believe there's a problem with the ribbon cable, instead of the adapter itself.

And there's a few ways to find out.
1. replace the ribbon cable.
2. use an ohmmeter to test for shorts or opens in the ribbon.
3. visually insure that each conductor lines up with the correct Pins on the IDC connectors.

I just can't see one of those adapters failing on it's own.
<br>

[-Dan-]

HI Darrel

i'm using the 16f870, ive connected the ribbon cable and inserted the pic in to the adaptor as in the attatched diagram.

i have done a continuity test on the ribbon cable, and all seems ok and there seems to be no shorts.

i see what your saying about not much can go wrong with the adaptor, its basically a zif socket on a pcb.


why can't things just work when you plug them in haha

I hate to disagree with melabs support, ... but ...
I just have a hard time believing that.

There's nothing on the adapter itself that can fail.
Unless there's some burnt traces or something. (which you would probably see)

You never did answer the questions ...

Which PIC are you using?
Which way did you plug it in?

It's one thing to say it's correct, but for someone else to help troubleshoot, it makes it easier to know the actual details, so that the problem can be dismissed.

Assuming that the answer to both questions is indeed "They are the correct way".
I would be more likely to believe there's a problem with the ribbon cable, instead of the adapter itself.

And there's a few ways to find out.
1. replace the ribbon cable.
2. use an ohmmeter to test for shorts or opens in the ribbon.
3. visually insure that each conductor lines up with the correct Pins on the IDC connectors.

I just can't see one of those adapters failing on it's own.
<br>

[muddy0409]

Hmmm...Blowed if I can find mine after my 3000km re-location.
Just to humour me, connect the ribbon to the other header on the adaptor, It's a long time since I used mine, but with all this discussion, I seem to recall I had some similar problems and changing things like that fixed them??

And as a further follow up, I think there is something about the labeling that is easily confusing..

[-Dan-]

ive just noticed something about the ribbon cable

forgive my crude drawings here mspaint was a quick option.

This is how my ribbon cable is :

<img src="http://img106.imageshack.us/img106/17/ribboncable1lg1.jpg"></img>


I'm just wondering should it be like this :


<img src="http://img126.imageshack.us/img126/8946/ribboncable2qa8.jpg"></img>