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Lasermad.com • View topic - PCB Assembly discussion

PCB Assembly discussion


Site Admin

Posts: 950

Joined: Tue Jul 24, 2012 8:05 pm

Post Sun Aug 03, 2014 1:02 am

PCB Assembly discussion

Suggestions for improvements, mistakes, hints here please.

I've posted an image of the PCB track Gerbers here to help tracing faults.

V1 BOTTOM:

Image

V1 TOP:

Image

V1 Component overlay:

Image

V2 BOTTOM:

Image

V2 TOP:

Image

V2 component overlay:

Image

If the '8' or DPs aren't working you may have cut through the track when removing the through-hole links. If so use a short piece of insulated wire to link the pads indicated here, pink for '8' and green for DPs:

Image
.

Posts: 10

Joined: Sat Oct 05, 2013 11:51 pm

Post Mon Aug 11, 2014 9:44 am

Re: PCB Assembly discussion

Hey Tony

I've begun to build the clock kit this past weekend, so far so good. I've only run into one issue with the assembly. The included socket for IC1 was incorrect. The kit contained (2) 16 pin sockets rather than (1) 16 pin and (1) 18 pin socket. Not really a big deal, I was tempted to mount IC1 directly to the board but decided not to as I've had bad luck with removing soldered ICs. I ended up using a 20 pin socket from my own stash of parts and trimmed it down to fit. 8-)

Site Admin

Posts: 950

Joined: Tue Jul 24, 2012 8:05 pm

Post Tue Aug 12, 2014 12:21 am

Re: PCB Assembly discussion

Now that has me worried :? it's one of those things that just shouldn't happen as the 16 and 18 pin sockets are added in different stages to avoid just this. I hope a tube of 16 pins hasn't been mixed up with the 18 pins.

I'm pleased you managed to work around it, 18 is one of those tricky sizes to make up.

Posts: 7

Joined: Wed Nov 26, 2014 3:10 am

Post Wed Jan 14, 2015 4:10 pm

Re: PCB Assembly discussion

Tony, on the Bag 1 parts instructions it refers to a r251. This should be r25.

Site Admin

Posts: 950

Joined: Tue Jul 24, 2012 8:05 pm

Post Wed Jan 14, 2015 6:21 pm

Re: PCB Assembly discussion

Thanks for letting me know, I've edited it. One day I might put together a kit scary enough to use over 250 resistors but not just yet :lol:

Posts: 3

Joined: Mon Dec 29, 2014 4:16 am

Post Wed Jan 21, 2015 3:48 am

Re: PCB Assembly discussion

Hi Tony,

I have reached the point of testing the clock and although all 5 led's do light, they're significantly dimmer than they should be. The IR sensor does work but the LED output is off. This is both before and after the crystal mod. Any ideas?

Posts: 7

Joined: Wed Nov 26, 2014 3:10 am

Post Wed Jan 21, 2015 9:50 pm

Re: PCB Assembly discussion

Posts: 3

Joined: Mon Dec 29, 2014 4:16 am

Post Thu Jan 22, 2015 3:17 am

Re: PCB Assembly discussion

Site Admin

Posts: 950

Joined: Tue Jul 24, 2012 8:05 pm

Post Thu Jan 22, 2015 3:59 am

Re: PCB Assembly discussion

How dim are they?, they're driven at a low on cycle so won't appear to be bright. Check the processor is receiving about 4-4.5V at pin 14, also as you have L1 in place carefully check for 190V on R25.

Posts: 7

Joined: Wed Nov 26, 2014 3:10 am

Post Fri Jan 23, 2015 4:08 am

Re: PCB Assembly discussion

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