Page 5 of 10
Re: MUX_SH board mod tutorial
Posted: May 30th, '18, 16:26
by serum114
Today I built 4 mux boards and only one works at IC111 so now for me I'm going to going down the route of bad SMD practices. This afternoon I desoldered all componants from 10 mux boards and I've found a local electronics engineer who will do the work for me. Hopefully this will put to bed a lot of speculation - from myself - and they will all come back working.
Re: MUX_SH board mod tutorial
Posted: Jun 20th, '18, 08:17
by hofmann25
Whats this Mod Vincent? Red wire on IC115.
![Image](https://s22.postimg.cc/k5p7hvesx/26264599419_d3ce3cb205_c_copy.jpg)
Re: MUX_SH board mod tutorial
Posted: Jun 20th, '18, 08:54
by KlangGenerator
hofmann25 wrote:Whats this Mod Vincent? Red wire on IC115.
![Image](https://s22.postimg.cc/k5p7hvesx/26264599419_d3ce3cb205_c_copy.jpg)
My guess: a broken trace.
![Wink ;)](./images/smilies/icon_e_wink.gif)
Re: MUX_SH board mod tutorial
Posted: Jun 20th, '18, 09:01
by hofmann25
Re: MUX_SH board mod tutorial
Posted: Jun 20th, '18, 09:47
by KlangGenerator
Since this is one of the poorly engineered early PCB version, I doubt that a broken trace couldn't also happen to Vincent.
![Wink ;)](./images/smilies/icon_e_wink.gif)
Re: MUX_SH board mod tutorial
Posted: Jun 20th, '18, 09:53
by KlangGenerator
The wire is connected between PIN3-8. Looking at the bottom layout these two pins are connected by a trace. So that red wire replaces the trace.
![Wink ;)](./images/smilies/icon_e_wink.gif)
Re: MUX_SH board mod tutorial
Posted: Jun 20th, '18, 10:14
by hofmann25
KlangGenerator wrote:The wire is connected between PIN3-8. Looking at the bottom layout these two pins are connected by a trace. So that red wire replaces the trace.
![Wink ;)](./images/smilies/icon_e_wink.gif)
Roger that sherlock
![Very Happy :D](./images/smilies/icon_e_biggrin.gif)
Re: MUX_SH board mod tutorial
Posted: Jun 20th, '18, 12:01
by hofmann25
I finished this Mod. Firmware Nava_v1_027.
Machine does not work anymore. Nothing. Not a sound.........
Re: MUX_SH board mod tutorial
Posted: Jun 20th, '18, 12:55
by gihaume
I had the same issue.. it was the connectors, I connected a - to +. Maybe you did this too ?
Re: MUX_SH board mod tutorial
Posted: Jun 20th, '18, 22:10
by hofmann25
No. Visually and continuity checked to the header. Only thing I did different to Vincent's guide was hook up the right board to the closest + G - pads.
![Image](https://s33.postimg.cc/bywgsg7in/IMG_20180620_203437_125.jpg)