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 Novice question: Flux, solder paste and air nozzle
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benaknoun

Spain
133 Posts

Posted - 02/09/2012 :  14:13:21  Show Profile  Reply with Quote
Hi
I just bought this air nozzle:
http://www.mcumall.com/comersus/store/comersus_viewItem.asp?idProduct=4452

And this solder flux kit:
http://www.mcumall.com/comersus/store/comersus_viewItem.asp?idProduct=4446

I have a couple of questions please, sorry i'm new to this..

1-I used the air nozzle today to desolder a SOIC8 chip, but it took longer than when using a round 3 mm air nozzle, is this normal?
in fact, i could not desolder the chip with this nozzle, i had to use the round 3 mm nozzle.

2- with the essential pack, how do i use the solder paste and the flux, does anyone have a video for me to watch please?
with the SOIC8 i don't use anything, apart from solder, but i know with other chip i have to use flux, but what do i need the paste for?

Thanks in advance

Reply #1

ZLM

2937 Posts

Posted - 02/09/2012 :  21:49:48  Show Profile  Reply with Quote
1. it is normal. Adjust the distance between nozzle and the chip will adapte the size.
2. the solder paste is used when you have soldering mask with your PCB. If you do not have mask, then you can put some past on the soldering pads, the component pins should stick on the paste. Using the hot air to heat the paste untill it is melted.
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Reply #2

benaknoun

Spain
133 Posts

Posted - 02/10/2012 :  05:01:41  Show Profile  Reply with Quote
quote:
Originally posted by ZLM

1. it is normal. Adjust the distance between nozzle and the chip will adapte the size.
2. the solder paste is used when you have soldering mask with your PCB. If you do not have mask, then you can put some past on the soldering pads, the component pins should stick on the paste. Using the hot air to heat the paste untill it is melted.



Thanks ZLM

1- Do you mean have the nozzle much closer to the chip pins? is there no risk or burning the chip?

2- what is mask? do you mean solder on the pads?

Thanks again
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Reply #3

benaknoun

Spain
133 Posts

Posted - 02/14/2012 :  17:04:05  Show Profile  Reply with Quote
Hello
No answers to my previous question ?

Thanks
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Reply #4

ZLM

2937 Posts

Posted - 02/14/2012 :  23:54:26  Show Profile  Reply with Quote
1. nozzel is used to blow the hot air only on the chip pins, not the body. So, it will not burn the chip.
2. the solder mask is used to place the solder paste on the PCB. It is similar to silk screen printing. IT will printing the solder paste on the PCB. Then the SMD chip will be able to stuck on the solder paste.
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Reply #5

benaknoun

Spain
133 Posts

Posted - 02/15/2012 :  11:09:20  Show Profile  Reply with Quote
Hi
I have tried again tonight, held the nozzle about 1cm away from the chip pins, for about 3 or 5 minutes and NOTHING !! the chip will not desolder.
Reinstalled the other round 3mm nozzle and the chip desoldered in 30 Seconds !!

Either the nozzle i bought is **** or something is wrong !!
I have a feeling the nozzle is not right !

Edited by - benaknoun on 02/15/2012 15:14:20
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Reply #6

benaknoun

Spain
133 Posts

Posted - 02/15/2012 :  17:13:36  Show Profile  Reply with Quote
Hi ZLM
I was looking at the nozzle, and i was thinking that maybe the distance between the outlet ports is too large? which means the heat isn't going on the pins, what do you think?
Look at this photo
Thanks



Image Insert:

65.74 KB

Edited by - benaknoun on 02/20/2012 06:04:12
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Reply #7

benaknoun

Spain
133 Posts

Posted - 02/20/2012 :  06:05:16  Show Profile  Reply with Quote
I have resized the picture to smallest size and still not showing on forum, i have always had problems loading photos on here !!
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Reply #8

benaknoun

Spain
133 Posts

Posted - 02/20/2012 :  07:13:50  Show Profile  Reply with Quote
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Reply #9

ZLM

2937 Posts

Posted - 02/23/2012 :  00:31:07  Show Profile  Reply with Quote
do not include SPACE and special char in the file name. Shorter, the better.
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Reply #10

benaknoun

Spain
133 Posts

Posted - 02/24/2012 :  06:53:40  Show Profile  Reply with Quote
Hi
It seems that the photo has now been uploaded
Strange because it always takes about 3 days for the photo to show on forum, anyway,
Can you answer my question about this nozzle, should i reduce the distance between the air outlet ports?
I feel that the hot air is not falling directly on the chip pins

Thanks
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Reply #11

ZLM

2937 Posts

Posted - 02/25/2012 :  21:18:27  Show Profile  Reply with Quote
Yes. you can reduce the distance. The correct way is testing with different air temperature and air volume, untill the chip can be easily removed.
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Reply #12

benaknoun

Spain
133 Posts

Posted - 02/26/2012 :  15:01:15  Show Profile  Reply with Quote
Hi
I am using your recommended settings which are 350 degrees and 80 air pressure which I found on the tutorial video
I have tried also to desolder a tsop56 flash with the TSOP air nozzle and had no luck
I've had to use again the 3mm round nozzle
I think I should pre-heat the board first using preheating stations
What do you think?

Thanks again for your help

Edited by - benaknoun on 02/26/2012 15:02:33
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Reply #13

ZLM

2937 Posts

Posted - 02/26/2012 :  15:49:28  Show Profile  Reply with Quote
I do not use any nozzle on TSOP56. 350 degree C and about 1~2" distance will work. 350 degree C will not harm the chip if you finish it with in 5 minutes.
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Reply #14

benaknoun

Spain
133 Posts

Posted - 04/26/2012 :  15:18:30  Show Profile  Reply with Quote
quote:
Originally posted by ZLM

I do not use any nozzle on TSOP56. 350 degree C and about 1~2" distance will work. 350 degree C will not harm the chip if you finish it with in 5 minutes.



I think to finish a TSOP56 within 5 minutes is a record !
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Reply #15

Bad_Ad84

210 Posts

Posted - 04/26/2012 :  23:14:40  Show Profile  Reply with Quote
Takes about 20 seconds to remove a TSOP48/56
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Reply #16

ZLM

2937 Posts

Posted - 04/27/2012 :  00:05:09  Show Profile  Reply with Quote
Sorry, my 5 minutes is a mistake. It should less than 1 minute. 5 minutes should remove more than 5 TSOP56. :)
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