NC in the schematic is a NP (Non-polorized film Capacitor) each C6, C7 and C54 of the schematic above are NC caps as opposed to polorized electrolytic caps... Since the value isn't printed the requirement was replaced with an opposing cap, in this case with a polorized electrolytic instead. It is common to see these design changes and see them still noted in the schematic because they appear on the board. This usually happens when it was too late to correct the board or more costly to redraft the board to eliminate the pos#... Bill
The circuit ends at C53 with the use of two resistors R103 and R132 that's simply an after thought in the design and C54 was eliminated, but probably not before they had sent the thousands of boards to be etched... So it will appear on the schematic but with no value - - because nothing goes there..
As for EC3 - - Q9 triggers to ground at R29, should be no reason to cap this but I am surprised they didn't make R29 a fuseable resistor to ground. (more reliable).
EC12 is a redundant EC11, both drawing ground from the backside of the transformer T2D at/near FG2. I have no clue why this was added to the design unless they were looking for a more stable test point denoted by the 8A on the positive side of EC12..
Now Kris, I'm curious why you've rated my helping you so poorly? My suggestion to you on this was to replace the smps to repair the problem. Unlike most DIY'ers you've chosen to attempt a repair on this module and use it like a classroom project - then when I've answered you rated me as less than useful I don't get it, what part of my help are you finding useless?
BillThe circuit ends at C53 with the use of two resistors R103 and R132 that's simply an after thought in the design and C54 was eliminated, but probably not before they had sent the thousands of boards to be etched... So it will appear on the schematic but with no value - - because nothing goes there.. As for EC3 - - Q9 triggers to ground at R29, should be no reason to cap this but I am surprised they didn't make R29 a fuseable resistor to ground. (more reliable). EC12 is a redundant EC11, both drawing ground from the backside of the transformer T2D at/near FG2. I have no clue why this was added to the design unless they were looking for a more stable test point denoted by the 8A on the positive side of EC12..
Now Kris, I'm curious why you've rated my helping you so poorly? My suggestion to you on this was to replace the smps to repair the problem. Unlike most DIY'ers you've chosen to attempt a repair on this module and use it like a classroom project - then when I've answered you rated me as less than useful I don't get it, what part of my help are you finding useless? Bill
Answers & Comments
NC in the schematic is a NP (Non-polorized film Capacitor) each C6, C7 and C54 of the schematic above are NC caps as opposed to polorized electrolytic caps... Since the value isn't printed the requirement was replaced with an opposing cap, in this case with a polorized electrolytic instead. It is common to see these design changes and see them still noted in the schematic because they appear on the board. This usually happens when it was too late to correct the board or more costly to redraft the board to eliminate the pos#...
Bill
The circuit ends at C53 with the use of two resistors R103 and R132 that's simply an after thought in the design and C54 was eliminated, but probably not before they had sent the thousands of boards to be etched... So it will appear on the schematic but with no value - - because nothing goes there..
As for EC3 - - Q9 triggers to ground at R29, should be no reason to cap this but I am surprised they didn't make R29 a fuseable resistor to ground. (more reliable).
EC12 is a redundant EC11, both drawing ground from the backside of the transformer T2D at/near FG2. I have no clue why this was added to the design unless they were looking for a more stable test point denoted by the 8A on the positive side of EC12..
Now Kris, I'm curious why you've rated my helping you so poorly? My suggestion to you on this was to replace the smps to repair the problem. Unlike most DIY'ers you've chosen to attempt a repair on this module and use it like a classroom project - then when I've answered you rated me as less than useful I don't get it, what part of my help are you finding useless?
Bill