[SOLVED] pickit2 clone vpp error voltage

[kanni1303]

I built a pickit 2 clone referring the site
i got problem that vpp error voltage I checked the whole board but not able to resolve this, I am getting 4V in vpp

Using troubleshoot in PC i found one thing, when I keep voltmeter across pin25 (Vpp_TGT_P) I am able to get 12v in vpp (I thought it needs weak pulldown) so I tried with 1M resitor across Pin25 and GND now the circuit able to generate 12v output at VPP but still the error rises... I can't resolve this why the error rises

Kindly help me out to get this

 

[wp100]

Hi,

Assume you do not have it connected to an actual pic chip and using the Trouble Shooting part of the Pk2 program V2.61 ?

Then I would think you have a pcb track short /error of a faulty transistor, so easy to get the pinout the wrong way round; ensure your pinout diagram if for the manuafacturer of the transistor you have, they can vary from one maker to another.

Seems to be a 'full' clone as against a cut down one without those memory chips etc; wonder if it is cheaper than buying a proper ready make Pk2 ?

 

[kanni1303]

But i am getting 12v in VPP test , if i check for first time it says a short detected and if i check for second time onwards it shows 12v(11.7V to 12V changes on every time) I can't get why it behave like this, If any transistor was fault then I should not get the 12V anytime...????

 

[wp100]

But i am getting 12v in VPP test , if i check for first time it says a short detected and if i check for second time onwards it shows 12v(11.7V to 12V changes on every time) I can't get why it behave like this, If any transistor was fault then I should not get the 12V anytime...????

Hi,

You did not say if it was connected to a pic chip or not, if so has the target pic chip got its own power supply switched on ?


If not connected to a chip, then being as the Pk2 is not overvolting why not try connecting it to a pic chip and seeing if it will read and program it ok ?

 

[kanni1303]

I tried with connecting to target chip also but no use with that...

In troubleshoot I am getting sometime 12v and sometime not... may I know why it is so or on what part should I look at to solve this

Hi,

You did not say if it was connected to a pic chip or not, if so has the target pic chip got its own power supply switched on ?


If not connected to a chip, then being as the Pk2 is not overvolting why not try connecting it to a pic chip and seeing if it will read and program it ok ?

 

[wp100]

Hi,

If you search this forum with " pickit2 clone vpp error " you will find a good few entries that might have some useful information

The pickit2 clone is a well used circuit and using Microchips proven software means any problems will most likely be down to the components and build quality.

Also , how well proven is that project and pcb, its not one I have seen before, there are some projects out there with uncorrected errors.

 

[kanni1303]

I searched... no one got such thing... sometimes I am getting 12v and sometimes not... where I can suspect the problem would be... I checked the whole 12v line there I could not find any short... pls help me where to start debugging...

 

[wp100]

I searched... no one got such thing... sometimes I am getting 12v and sometimes not... where I can suspect the problem would be... I checked the whole 12v line there I could not find any short... pls help me where to start debugging...

Hi,

If you see that projects sites Comments at the bottom of its page there are a lot of entries right up to this summer 2014 and there are a couple of posts regrading Vpp problems and the action to take.

If you still have problems it would seem the best place to ask for hep with that project.

 

[kanni1303]

thank you very much

Hi,

If you see that projects sites Comments at the bottom of its page there are a lot of entries right up to this summer 2014 and there are a couple of posts regrading Vpp problems and the action to take.

If you still have problems it would seem the best place to ask for hep with that project.

 

[kanni1303]

There was problem with VPP ON pullup resistor I replaced that with low resistance and it worked fine... Thnx for your reply... Thnx a Lot...