madbeanpedals::forum

Projects => Tech Help - Projects Page => Topic started by: Stig on August 24, 2014, 09:01:25 AM

Title: Chimaera not working.
Post by: Stig on August 24, 2014, 09:01:25 AM
I all. I posted this at the GC forum, but no response, so now I give the beaners a go :)

I jumped on the Chimaera when i heard that it was going to be discontinued, dispite of having build to Kingslayer and the Sunking II. I wanted to try out the findings over at BYOC. Cant get enough of dirt pedals :D

There has been a couple of things with this build:
First the gain pot didn' t work properly. There were clean signal but when I turn up the gain it cuts the signal. I have checked the pot and swapped C7 and C8. Both ways actually. I checked the diodes and couldn' t get a reading with my DMM(When someone writes DMM I always read Deluxe Memory Man :lol: ). So I unsoldered the diodes and put sockets instead. That did not solve the problem, the diodes did work I have no idea why I couldn' t get a reading.

Now theres no sound, only motor boating/oscillation. I reflowed over some of the solder joints and noticed there seems to be a tracelift around the diodes. I don' t feel like I have used eccesive heat in removing the diodes, But apparantly enough.

Are there any way I can make the connection flow again after the lifted trace?

The board looks pretty scuffed up as I have been working on it a lot, quite abit more than usual, but I have attached some pics.

Thanks in advance :)
Title: Re: Chimaera not working.
Post by: selfdestroyer on August 24, 2014, 03:08:51 PM
You may want to post this over at http://www.grindcustomsfx.com/forum/ (http://www.grindcustomsfx.com/forum/)

I know Rej (Grindcustoms) likes to keep his troubleshooting on his forum for archive to help others with his PCBs.

Just a thought. Hope you get it going.

Cody
Title: Chimaera not working.
Post by: muddyfox on August 24, 2014, 03:17:23 PM
i think he mentioned way up that he already posted there.
i have nothing else of substance to offer other than an audioprobe suggestion, seeing how i never built a chimera ... :)
Title: Re: Chimaera not working.
Post by: selfdestroyer on August 24, 2014, 03:29:46 PM
This is what happens when I get up before noon on a Sunday. Ignore me. I can't believe I read right past that.

Cody
Title: Re: Chimaera not working.
Post by: Stig on August 24, 2014, 03:42:24 PM
Thanks for your replys. I Will wait for a response over at gc.
Title: Re: Chimaera not working.
Post by: TGP39 on August 24, 2014, 06:03:24 PM
Hi Stig. I just finished one of these. There has been massive confusion regarding C7 and C8 due to the silk screen error.  Your gain pot would have acted as you described it if C7 and C8 were reversed. It looks like you desoldered them and switched them in the above picture. They are now in the right place, but I'm not sure if you did any damage while resoldering?   Sometimes dead or lifted traces happen when desoldering. I'm not sure how to fix the board when/if this occurred. Hope this helps a little. Steve.
Title: Re: Chimaera not working.
Post by: GrindCustoms on August 24, 2014, 10:05:35 PM
I do my round on the board once à day and get through the action on there. Since there's not much traffic other than the occasional trouble shoots.

Checking it there now.

Rej