Re: Power Supply for Quadrafire Pellet Stove
You have indicated that you replaced the STR-W6756, what did you find wrong with it?
Please check the resistance between pin 1 and pin 3 of the old STR W6756 to see if it shows very low resistance (<10 Ohms).
Right now those two resistors for the Source pin (PIN 3) of the STR-W6756 have gone open circuit probably due to shorted MOSFET inside the STR W6756.
What is the marking on R9? I expect that to be around 10 Ohms.
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Re: Power Supply for Quadrafire Pellet Stove
The ESR on C19 is 7.63 and the capcitance is 2.9 uF.. the cap is a 2.3uf at 50V
R15 and R19 both have a resistance of 130.6K with meter terminals one way and reversing the terminals I get both to measure 141.8K
Based on the online SMD resistor calculator these should be 0.20 ohm and 0.33 ohms is this correct??
R9=1KLast edited by mike123333; 10-26-2016, 08:00 PM.Leave a comment:
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Re: Power Supply for Quadrafire Pellet Stove
C11 will not be the cause of the problem, it is for EMI,not needed for the circuit to function.
What ESR and capacitance do you get on that small lytics cap c19. next to the STR SMPS IC?
How about R15, R19 which are connected in parallel, what resistance do you get?
R9 resistance?
This is double sided PCB so it is not going to be easy to trace.Last edited by budm; 10-26-2016, 07:05 PM.Leave a comment:
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Power Supply for Quadrafire Pellet Stove
I am attempting to repair a power supply for a friend that was water damaged.I replaced the components that were damaged or rusted from the circuit which were C11 the blue large capacitor and U2 which is STR W6756. After the replacement of the parts I do not have the 15v DC output from the secondary side of the transformer. The large capacitor is giving voltage of 168-170V DC. I have checked the capacitors and resisters and do not find anything wrong. I am unsure as to what maybe causing the issue. D2 is an E2204. Any advice or input would be greatly appreciated.Attached Files -
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