Sammich menu acting strange

[tmarcel]

Dear Midiboxers,

I am a proud owner of a sammichSID since this weekend. I installed the midibox_sid_v2_0_rc36 with the v2_vintage_bank.syx presets. I can play my presets from A001 to A128 without any problem.

However i do seem to have some problems with creating my own sounds or tweaking one of the presets.

For example if i have a sound (A003) and i press one of the 5 top buttons i enter the menu. In that menu i have the possibility to change the OSC, FIL, LFO, SAV etc. If i click OSC i go to the OSC menu. Here i can make my adjustments. When i have editted a parameter and want to save my change i need to press menu to go back to main menu where the SAV option is available.

Here the problem shows up. When i want to go back to the main menu it will go back, but not to the mainmenu of the sound i just editted. When i editted A003 it goes back to A002 and so i lost all my changes. This way it is never possible for me to save any sound.

I also noticed that the "up" button on the right bottom corner not works when i am in the menu. The "downbutton" works fine.

I hope my problem is discribed clearly and that there is someone who can tell me what the solution to this problem is.

is this a hardware or software problem? am i the only one who has this problem, or should i just be patcient till the next os update comes?

Greet,

Marcel

Edited April 16, 2010 by tmarcel

[Wilba]

This could be caused by a short on the control surface PCB. It is more likely to be a hardware problem than software, if you installed the software without any errors.

Check your solder joints around IC2, which is between the F3 and Down buttons.

Check also if there are any shorts between the switch pins and the heatsink.

You might want to also try swapping the two 74HC165 ICs in case one of them is faulty.

What happens when you are in the top menu and press the Up/Down buttons? You say Up works... what happens when you are in the top menu and showing patch A003 and press Menu? Does this change patch to A002?

[tmarcel]

What happens when you are in the top menu and press the Up/Down buttons? You say Up works... what happens when you are in the top menu and showing patch A003 and press Menu? Does this change patch to A002?

When i press the menu button in the top menu it indeed will go from A003 to A002.

The down button works fine. Up button does nothing (as far as i can see).

Edited April 15, 2010 by tmarcel

[Wilba]

Check if the bottom-right pin of S10 is shorting with (connected to) bottom left pin of S11.

I can't see how this could happen even with bad soldering but that's the effect.

[tmarcel]

Check if the bottom-right pin of S10 is shorting with (connected to) bottom left pin of S11.

I can't see how this could happen even with bad soldering but that's the effect.

It all seems to look fine... I added 2 pictures. Maybe you can see anything strange...

[Wilba]

Can you check if RN3 is oriented correctly? (also check RN1, RN2 and RN4).

From this photo, I cannot see the label on RN3, which I expect to see on the side facing the IC. It is leaning away from the IC, and from that angle I can't see any label.

The label should be •6A103G where • should be aligned with the white dot on the PCB.

Therefore, the label will be facing AWAY FROM the IC for RN2 and RN4, and facing TOWARDS the IC for RN1 and RN3.

This might explain the button problems... if RN3 is not placed correctly, then all the input pins will have a variable pull-up to 5V... if one switch closes, the other inputs drop from 5V to 2.5V... lots of weird stuff happens, I won't bother with more explanation, but it would explain the multiple problems you have, and that one switch seems to be registered as other switch presses.

Resistor networks are a real pain to remove, like IC sockets. If it is incorrectly placed, I would recommend you cut it and remove each pin separately, and let me send you a replacement resistor network.

[tmarcel]

Therefore, the label will be facing AWAY FROM the IC for RN2 and RN4, and facing TOWARDS the IC for RN1 and RN3.

I think we found the problem here! In my situation RN2 and RN3 are facing away from the IC. RN1 and RN4 are facing Towards the IC.

Double check: so all the •6A103G textlabels will be facing the display?

I would be very thankful if you could send me 2 new resistor networks so i can replace them.

Edited April 18, 2010 by tmarcel

[Wilba]

I think we found the problem here! In my situation RN2 and RN3 are facing away from the IC. RN1 and RN4 are facing Towards the IC.

I've been waiting all weekend to be proved right.

So RN3 and RN4 are positioned incorrectly. I have no idea how your encoder is working with RN4 the wrong way around!

Double check: so all the •6A103G textlabels will be facing the display?

Since all the RN parts are aligned the same way, i.e. horizontally with common pin on the right side end, all the •6A103G labels SHOULD BE facing upwards, towards the display.

I would be very thankful if you could send me 2 new resistor networks so i can replace them.

Sure, no problem.

Please advise me how you would change the build guide to prevent others from making the same mistake :tongue: