Re: Fried hotend MOSFET - how to bypass?
basically what y did is correct. and the board should work, u r saying there is a constant 12V on the heater, meaning the heater is activated or what, the heater is has a 12v supply and control by...
View ArticleSainSmart Melzi avrdude: stk500_getsync(): not in sync: resp=0x00
I have just recieved my sainsmart melzi board. i have yet to connect it to ANYTHING ie. stepper motors/hot end/heated bed i have however Switched the jumper to usb attached the cable i had also got...
View ArticleRe: SainSmart Melzi avrdude: stk500_getsync(): not in sync: resp=0x00
Have you selected the correct COM port before uploading ?
View ArticleRe: SainSmart Melzi avrdude: stk500_getsync(): not in sync: resp=0x00
Flashing LED is normal when the USB is connected. As well as the power from USB jumper, you need to connect the reset jumper at the end of the board near the temp sensor terminals (remember to...
View ArticleRe: Fried hotend MOSFET - how to bypass?
Hi all. It seems it's the ATMEGA that is not working. I get no signal change out from pin 19. So nothing is switching. Well, I went and bought myself a new board in the meantime, I guess I'll have a...
View ArticleOne end stop to pull them all...
Hi. I have a problem with my end stops and my Sanguinololu. I start all up, and no end stop is switched. I do a M119 in pronterface, which gives me: "x_min:L, y_min:L, z_min:L" When I touch one of the...
View ArticleRe: One end stop to pull them all...
I think you have a hardware fault.. each endstop is connected to their own IO line... one cannot effect the others unless there is a short...
View ArticleRe: One end stop to pull them all...
Oh, crap. There is a contact between the signal pins on the board. Is this not normal? I worked my way around this by each time starting a print manually zero the x and y axis, and then let the end...
View ArticleRe: One end stop to pull them all...
no. there shouldn’t be any contact between the signal lines. Its this a 40 pin dip SL? (big large black chip) or a surface mount job? (quite small, easy to short pins)
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Re: One end stop to pull them all...
It's the big one (I believe). See pics below. 16i3.jpg 6a7o.jpg There doesn't seem to be any connections between any of the pins on the backside. When I measure the resistance between two signal pins...
View ArticleRe: One end stop to pull them all...
With the ATmega removed, the signal lines shouldn't be connected to anything, so infinite resistance between these three lines. 2 ohms might cause a distribution of one signal to all pins. To remove...
View ArticleGrinding noise and drift on x-motor mount:X
Hi. I'm exploding this forum with my messages at the moment. All help is appreciated. I'm getting some drift in one of my axes. I followed a lot of guides that I found on the web about: tension of the...
View ArticleBoard occasionally looses RS connection
Annoying problem which sometimes occurs during printing: board starts to send responds in wrong baud rate (as far as I can tell). All commands are executed in Marlin but nothing comes back to...
View ArticleRe: One end stop to pull them all...
on your image for the bottom of the board just behind end stops is a thread connecting the endstop pins check that thread isn’t conductive... remove it regardless...
View ArticleRe: One end stop to pull them all...
Thanks. When removing the ATMEGA there is infinite resistance between the signal pins on the connectors. So that seems ok. I'm out of ideas, since a long time now...
View ArticleRe: One end stop to pull them all...
I did as you say and removed any threads on the back and on the front of the card, but the result is the same. All end stops are pulled at the same time.
View ArticleRe: One end stop to pull them all...
Can you measure wether actually all three pins go 5V? If not, it's time to check firmware configuration, like uploading something self-compiled, like using a known firmware instead fo the vendor...
View ArticleRe: One end stop to pull them all...
Alright. I have loaded the Sprinter firmware from: [github.com] How would I measure that? Between earth and the signal pin when I pull one of the end stops? For example I pull the z end stop and check...
View ArticleRe: One end stop to pull them all...
Ok, so I did the following easurements: with only z-end stop attached: z-end stop not pulled voltage between + and signal pin z-connector : 7.3 V voltage between + and signal pin y-connector : 7.3 V...
View ArticleRe: One end stop to pull them all...
Apparently you measure between 12V and signal. You should measure between signal and GND. Signal low means a maximum of 1.5V, signal high means at least 3V. Voltages should never exceed 5V. Measuring...
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