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SMT electronics assembly manufacturing forum.


PLCC PD's for IP3

Larry Johnson

#4376

PLCC PD's for IP3 | 21 April, 2000

I have been programming FUJI equipment for about 7 years now, and I am yet to fully understand this. PLCC's on an IP3. Front light, back light? Any CCD Level offsets? I just can't seem to get a good PD that will pass vision consistently. Can anyone give me some good tips when writing PDs for PLCCs using SMD3 vision.

Thanks... Larry J

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Dean

#4377

Re: PLCC PD's for IP3 | 21 April, 2000

Larry... I believe CCD offsets are not active on the IP3. Light levels and offsets are only availble in proper.

Use Front Light. Use a P-pattern with bright lead, dark back background (I think #3)...

The trick is to sample the lead width at the brightest point of the lead (J-lead). This is typically between 40 and 60 % of the length. Otherwise, your width tollerence will have to be very high to pass with 100% lead check.

If you call Fuji America, Service Dept. they will write the PD for you. In addition, they have a host of programming manuals which identify the required imputs for sucess. PS This is very reliable vision type when following recomended programming guidelines.

Hope this helps.

Dean

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JAX

#4378

Re: PLCC PD's for IP3 | 22 April, 2000

What's Up Big Man, Although I agree with a few things Dean said, personally I like back-light. But since you probably won't listen to me here's is the suggested info: Lead_check area= 60% Vision type= 120 P_pattern= 34

This rest is part dependant.

That's just my opinion, I could be wrong!

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John

#4379

Re: PLCC PD's for IP3 | 26 April, 2000

I agree with what has been said, P pattern takes some playing with, but length and width need to be what the machine is seeing not actual (use trace). The biggest improvement I got was slowing the frontlight scan speed to 50% of backlight setting in the proper. This has allowed us to frontlight all types of PLCC's and SOJ's with no problems what so ever. We have not used backlight on these parts for about a year now on 5 IP's. This is assuming you have set up your gain and offset correctly in the first place.

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