If I insert just u2,u3 and u7 the first 4 buttons right after boot sometimes give me different screens. Mostly the screen with BPM as first param and I also saw a screen with DST as first param. After a few clicks everything stops and I cant change the screen anymore. Not sure what this means.
right yeah I tried that and voice light did not light. I dont think it has anything to do with either of the chains since both chains are completely dead. Ive used good ICs in both the beginning of the chains and still nothing. Why am I not getting a steady clock? did you see what billie wrote about the clock signal on the scope?
yes. a faulty IC should not surpress the clock lines. and the clock should also be there without any IC at all. I'm looking at the PCB layout and your pics at the moment to figure out if there is a possible location where they could be pulled low/high due to a short.
Since your AVR is working in another unit, the software seems to work, too and the Signal is generated by the avr.
did you also try to measure if there is no continuity between the different DIN/DOUT lines? It's best done on the expansion header, since there all are available next to each other. The only exception would be the 2 data lines, since they are only connected to the 1st IC in the chain.
Also check if the 6 lines are not connected to GND or 5V (also on the expansion header).
you said the unit froze after changing the menus. does this also happen when you don't push buttons after a while? or can you still change values with the knobs/pots after the unit is running for a while if you don't push buttons?
did you also try to measure if there is no continuity between the different DIN/DOUT lines? It's best done on the expansion header, since there all are available next to each other. The only exception would be the 2 data lines, since they are only connected to the 1st IC in the chain.
Also check if the 6 lines are not connected to GND or 5V (also on the expansion header).
No cont between the DIN/Out lines(on expansion header). The DIN CLK line beeped when I had black from my voltmeter on GND and red on DIN CLK.
that pin was soldered good(one from you pic) and no if I wait some time button pushes dont do anything its only immediately after boot. I can still change pot values though and encoder works. Just no different menus. But when I said I get different menus its very wacky and sporadic but its always just right after it boots.
the continuity test can be done with power off right? No sounds when power is off but when I touch the s33(power switch bridge) points I get a nice sound so that s what id hear correct? Not entirely sure how to do tests correctly. but to confirm none of the Data lines produce sound when touched with GND and 5V.
You shouldmeasure continuity with power off. a continuous beep indicates contact between the 2 probes. you can think of it just like a light bulb with 2 cables, and when the 2 cables have contact, the light will flash (or in this case the multimeter makes a sound) so it does not matter if you have red or black probe on a specific point (unless you are measuring a diode).
with data lines you mean al 6 DIN and DOUT lines?
also, when I was asking about the button presses and the freezing machine you got it wrong what i meant. If you don't push any buttons, just turn the machine on and leave it running for a while, does it freeze, too? or are you still able to change values with the potentiometers? just to be sure that the AVR is running as it should.
Here it looks like the soldermask (the black stuff that covers the PCB) is scratched off. Also there is a solder blob that does not belong there. these are the DIN_CLOCK and DIN_LOAD lines. maybe there is a short? or below the AVR?
yes all 6 data lines I tested with power off. No shorts. Also yes pots and encoder stay working all the time. Like we said previously my avr in billies unit worked perfectly.
also check here. once again i can't really tell from the picture but it looks suspicious
have you measured continuity between those first 3 pins there at the arrow? this would be the DOUT_CLOCK line. on the picture it looks like there is contact between those pins. or is it just a reflection?
also check here. once again i can't really tell from the picture but it looks suspicious
have you measured continuity between those first 3 pins there at the arrow? this would be the DOUT_CLOCK line. on the picture it looks like there is contact between those pins. or is it just a reflection?
not sure if this means anything but on pin 9 and 10 of U2 there is continuity between the cap pads that are adjacent to each one but on u3 its only pin 9 that has continuity to the cap pad its next to. pin 10 doesnt have continuity to the cap pad it is next to. Only on u2 are both forming a connection
Actually it's not pin 10/9 but 15/16 (pin numbering is counter-clockwise). And your measured connections are ok. Pin 16 on both ICs is VCC (5V). The capacitor is connected between VCC and GND. At U2 (74HC165) pin 8 and pin 15 is connected to GND. At U3 (74HC595) pin 8 and pin 13 is connected to GND.
another wierd thing I noticed is if I disconnect the mainboard and boot the led lights up for "copy" then goes off after the boot. And its only intermitten not every time I recycle power. This is the only time Ive ever seen a LED light up.
That's all really strange. At least one LED is working ;-) And it's the only LED which is not connected to a resistor network but to a single resistor. Coincidence?
When I power up my LXR sometimes all LEDs light up and sometimes none or only some (during boot sequence). Depending on the time the LXR is powered off and the last state before powering off. That's normal behaviour.
Comments
Mostly the screen with BPM as first param and I also saw a screen with DST as first param. After a few clicks everything stops and I cant change the screen anymore. Not sure what this means.
and the clock should also be there without any IC at all.
I'm looking at the PCB layout and your pics at the moment to figure out if there is a possible location where they could be pulled low/high due to a short.
Since your AVR is working in another unit, the software seems to work, too and the Signal is generated by the avr.
It's best done on the expansion header, since there all are available next to each other.
The only exception would be the 2 data lines, since they are only connected to the 1st IC in the chain.
Also check if the 6 lines are not connected to GND or 5V (also on the expansion header).
does this also happen when you don't push buttons after a while?
or can you still change values with the knobs/pots after the unit is running for a while if you don't push buttons?
once again i can't really tell from the picture but it looks suspicious
a continuous beep indicates contact between the 2 probes.
you can think of it just like a light bulb with 2 cables, and when the 2 cables have contact, the light will flash (or in this case the multimeter makes a sound)
so it does not matter if you have red or black probe on a specific point (unless you are measuring a diode).
with data lines you mean al 6 DIN and DOUT lines?
also, when I was asking about the button presses and the freezing machine you got it wrong what i meant.
If you don't push any buttons, just turn the machine on and leave it running for a while, does it freeze, too?
or are you still able to change values with the potentiometers? just to be sure that the AVR is running as it should.
Here it looks like the soldermask (the black stuff that covers the PCB) is scratched off.
Also there is a solder blob that does not belong there.
these are the DIN_CLOCK and DIN_LOAD lines.
maybe there is a short? or below the AVR?
this would be the DOUT_CLOCK line. on the picture it looks like there is contact between those pins. or is it just a reflection?
and those are DOUT Clk
make sure the yellow pads are not connected to their neighbours.
And your measured connections are ok. Pin 16 on both ICs is VCC (5V).
The capacitor is connected between VCC and GND.
At U2 (74HC165) pin 8 and pin 15 is connected to GND.
At U3 (74HC595) pin 8 and pin 13 is connected to GND.
That's normal behaviour.