Just received my pack of 2 shruthis this morning and spent the afternoon to solder everything…Took me some time as I checked twice each step of assembly…
I checked the power of the filter board and all he checkpoints are fine (0, +5V or -5V depending of te measuring point). When I put the filterboard and the motherboard together, I get the +5V on the motherboard…but nothing happens, no lightened led, no heat, no smoke no nothing…I’m so disappointed…I wish I would have heard my shruthi tonight…
Where do I have to start to locate the problem on the MoBo ?
No LCD installed for the moment…As mentionned in the tuto, I wanted to check everything before soldering it !
I think I found the problem. The power is arriving on the +5 spot of the Mobo, but no +5 at all on the board (tested contacts between GND arrival and atmega pins and several other points).
I’ve had a problem during the soldering of the 8×1 male connector (a bit tired probably, I soldered it on the wrong side of the PCB…DOH )… It has been kind of a hard work to unsolder it and I think I’ve burnt the +5V track inside the PCB…I made a (temporarily) bridge between the MoBo +5V arrival and the positive lead of cap C4…and…IT WORKED leds are on and I can switch between pages (well pushing buttons puts other leds on (except one I think, is that normal ?). This temporarily voltage bridge will unfortunately but surely make this Shruthi really unique and mine
Do you think this “bridge method” will do the job ?
Anyway, working all day, I’ll keep you aware of the results tomorrow !
Do you at least get the LCD backlight? Even with a dead or missing CPU, you should at least get the backlight. If not, check that you get +5V on one of the leads of the 68R resistor (the one that is the closest to the MIDI connector).
If you get LCD backlight, then it’s likely to be a problem with the MCU.
Final question: you mentioned two kits… do you have the same problem with both?
well…no sound for the moment…seems like I have another problem with midi in…when sending a C4 using my sequencer, I’ve got no sound from audio out…and no drawing on the screen showing midi is arriving
Yeah there is a jumper, i search a photo to show you. For testing sound ability, you just have to push during about 1 or 2 seconds the first shruti’s button form left
I’ve got +5 between ground (pin 5) and VCC (pin 8) of the optocoupler 6n137…so I guess it’s not fried…I didn’t find anything in the reference manual about the midi jumper…seems like it was for the shruti or previous rev of the shrutHi…
yeahhhhh go for soundddddd nowwwww