I think I have an F3 board somewhere.
I will go look.
It will be easier if I have the board in my hands.
I will go look.
It will be easier if I have the board in my hands.
Something I might try (if I can find), is replace R19.
It's definitely a 47k resistor - but it might have been damaged (given I'm reading ~300 ohm rather than 47K +).
But my eyes are tired. Going to sleep now.
You've been really helpful 🙂
It's definitely a 47k resistor - but it might have been damaged (given I'm reading ~300 ohm rather than 47K +).
But my eyes are tired. Going to sleep now.
You've been really helpful 🙂
Dang- don't have any spare 47.5k resistors. Just assumed I had heads lying around :/
In the meantime, I'll reflow everything around the capacitance multiplier curcuit.
In the meantime, I'll reflow everything around the capacitance multiplier curcuit.
Well - I put a multimeter across R19, and i read ~400 ohms.
On the functional channel, it read about 38k (i think).
On the functional channel, it read about 38k (i think).
Bad diode, bad cap, or short.
I don't think it's a bad resistor cause you have current flow where there shouldn't be any regardless of the resistor value.
You could have a short in parallel with the resistor so it's measuring low.
Did you also replace the mosfet Q5?
I don't think it's a bad resistor cause you have current flow where there shouldn't be any regardless of the resistor value.
You could have a short in parallel with the resistor so it's measuring low.
Did you also replace the mosfet Q5?
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No - I was going to do that as a last resort - but might be easier than pulling those resistors out.
I'll try that after "work" tonight.
I'll try that after "work" tonight.
I replaced the diode and the cap yesterday - so highly doubt it's them.
Nothing leapt out as a short on inspection either - but I'll check again.
Nothing leapt out as a short on inspection either - but I'll check again.
Ah dammit.
I replaced q5, and it was all great! Measuring well, powered up slowly, all good.
Then while checking voltages, I managed to kill q2. I replaced it, and now the pins of q3 are starting to smoke.
Need to leave it alone for a night or two, then regroup.
I replaced q5, and it was all great! Measuring well, powered up slowly, all good.
Then while checking voltages, I managed to kill q2. I replaced it, and now the pins of q3 are starting to smoke.
Need to leave it alone for a night or two, then regroup.
