Re: Delta DPS-200PB-185A Schematic



These ones if I remember correctly...

Re: Delta DPS-200PB-185A Schematic



From memory there is a string of resistors that feed the rectified mains to the 6800 vcc pin. Vcc needs to get up to 5v before the 6800 will start up....

Re: Delta DPS-200PB-185A Schematic



Curiosity got the better of me so I opened the one I previously repaired to have a look (would probably have done that anyway once the other one got here).

The one connected to T351/3 is a 30C (20K). The other ones in that area are two of 01X (10 Ohm), 30C (20K) (a different one), 69Y (5.11 ohm) and an 09X (12.1 ohm). I think that last one is the one you have as 05?X. Don't forget to check the ones around the CM6800 chip, if any of them are blown replace the chip too....

Re: Delta DPS-200PB-185A Schematic



I should be looking at another one in a few days time (once it gets here), will have a look and let you know what is connected to T351/3...

Re: Delta DPS-200PB-185A Schematic

Me again, just a quick update to let you know that it is fixed and on test at the moment. The original symptoms was no 52V output and the 12v one was at 11.5 but dropped off as soon as any load was applied. To repair it I had to replace Q851 (also the flexible insulator to be on the safe side), R335 (0.56 ohm), a '10X' (10 ohm SMD resistor) in Q851 drive circuit, the CM6800 control chip and the SMD resistor connected to pin 9 (it was a '18A' (150 ohm)). Checked everything else I could with meter and Huntron tracker and nothing else obviously damaged....

Re: Delta DPS-200PB-185A Schematic

Hi guys, Noob here, I too am in the process of trying to repair one of these PSUs without a circuit diagram. Curiously it appears to be trying to start and had about 11.5 v on the 12v output but that dropped off as soon as any load was applied. I think I have identified most of the damaged components, the STW9NK90Z (Q851) was shorted all round, R355 (0.56 ohm) was open circuit, there is also a '10X' (10 Ohm) 0603 size resistor in Q851's drive circuit that is open. On the sub PCB I suspect the CM6800 is dead/damaged, one of the diodes showed short...