Power Supply for Quadrafire Pellet Stove

[mike123333]

Re: Power Supply for Quadrafire Pellet Stove

You just have to make sure that it is connected the same way as shown in the diagram because in the diagram I see 68K resistor R13 which is also connected to pin 7.
I think you should also repalce those two resistors that were blown open instead of using fuse or jumper just i case it wants to see the Vdrops on those two parallel connected resistors to function.

Thank you my friend for your help, I removed and soldered a 33 ohms resistor for R23 and bingo everything functions, the output voltage is fluctuating from 15.02. The VCC going to the STR is 13.98 which is turnign it on, I am unsure why the specs say low is 16 VDC and typical is 18VDC. At least the PSU board is operational. I am going to order the appropriate components as a permanent fix. It looked like the water damage took out the STR and the 3 resistors.

[budm]

Re: Power Supply for Quadrafire Pellet Stove

You mean 330 Ohms per SCH from the last diagram I found.
The 18V is the startup Voltage once it is running the Voltage does not have to be at 18V it can be lower (or higher as long as not exceeding the VCC max Voltage) as long as it is not does not reach the LOW VOLTAGE SHUTDOWN point.
I am glad I found that last diagram.

[mike123333]

Re: Power Supply for Quadrafire Pellet Stove

You mean 330 Ohms per SCH from the last diagram I found.
The 18V is the startup Voltage once it is running the Voltage does not have to be at 18V it can be lower (or higher as long as not exceeding the VCC max Voltage) as long as it is not does not reach the LOW VOLTAGE SHUTDOWN point.
I am glad I found that last diagram.

Yes it was the 330 ohms, I misread it at first and had a 33 ohms which I will get that corrected. It seems that the startup is quickly reached above 16V then the relay kicks in and then it drops to a steady 13.98V. BTW where did you get the schematics from google? Thanks again..

[budm]

Re: Power Supply for Quadrafire Pellet Stove

I search for 'str w6756 circuit' then I see 'Images for strw6756 circuit' and I looked through the images.
Most Chinese companies just use the application notes circuits to build the products to save money and times, and they just change the designator of the parts so it would not look like the original diagrams.
I am glad you got it working. You might as well recap the board with good caps too since the ambient for that board is probably higher than room temperature..