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 Correct temperature / air pressure / nozzle size
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benaknoun

Spain
133 Posts

Posted - 07/12/2013 :  07:25:27  Show Profile  Reply with Quote
Hi everyone
I have some questions please regarding desoldering with hot air.
I want to determine the correct temperature, air pressure, and nozzle size on my Aoyue 6031 hot air station.
On desoldering TSOP56 flash memory and SOIC8 eeprom.

When i set my hot air temperature to 340 degrees, air pressure to 060, with a round nozzle of 3mm, it takes 5 minutes to desolder a SOIC8.
With the same setting s as above, but with a 4mm round nozzle, it takes 1 minute to desolder a SOIC8.

So my question is, which setting is better?
With 4mm nozzle i am worried it is too big.
And with 3mm i am worried 5 minutes is too long.

Is 340 degrees enough or should i set it higher?

I also want to know the correct settings for a TSOP56

Any help would be much appreciated.

Thanks
Reply #1

ZLM

2937 Posts

Posted - 07/12/2013 :  09:50:20  Show Profile  Reply with Quote
The temperature selecting is based on your solder type.

But 350 C works for most of solder types.

Increase the temperture to 400 C and see if it works. The part should be removed in about 1-2 minutes.
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Reply #2

benaknoun

Spain
133 Posts

Posted - 07/12/2013 :  13:09:34  Show Profile  Reply with Quote
quote:
Originally posted by ZLM

The temperature selecting is based on your solder type.

But 350 C works for most of solder types.

Increse the temperture to 400 C and see if it works. The part should be removed in about 1-2 minutes.



That's great, thanks for the info.
I will increase the temperature and see what happens.
So the maximum desoldering time should be no more than 2 minutes?
Is that also for the TSOP56 ?
And what about the nozzle size, is 3mm better than 4mm?
With the 4mm it desolders quicker cause the hot air comes out more..

Edited by - benaknoun on 07/12/2013 13:10:45
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Reply #3

ZLM

2937 Posts

Posted - 07/12/2013 :  16:44:38  Show Profile  Reply with Quote
2-3 minutes with 400 C should not damage the chip.

You can use 4mm if you prefer.
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Reply #4

benaknoun

Spain
133 Posts

Posted - 07/13/2013 :  03:58:41  Show Profile  Reply with Quote
Thank you very much
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Reply #5

benaknoun

Spain
133 Posts

Posted - 07/13/2013 :  13:03:59  Show Profile  Reply with Quote
Another question please:

To desolder a TSOP56, i have a preheating station, to which temperature should i preheat the board?
To which temperature should i set the preheater?
Thanks again
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Reply #6

ZLM

2937 Posts

Posted - 07/14/2013 :  20:19:33  Show Profile  Reply with Quote
Depending on your board. IF your board has no plastic part, then you can preheat to 200C. The preheat can be used to reduce the on-hot-air time.
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Reply #7

benaknoun

Spain
133 Posts

Posted - 07/15/2013 :  14:07:21  Show Profile  Reply with Quote
Thank you ZLM
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