| Electronics > Repair |
| NAD T513 power supply load ! |
| (1/1) |
| guizmo1967:
Hello, I tried to repair a NAD T513 DVD/CD player that was showing "no disk error". Replacing the laser unit did not solved the problem. I noticed that the LA6560 Five-Channel Driver was getting really hot but did not bother to replaced it so I gave the unit to a recycle center. I kept the power supply for learning purpose but it is not working once removed from the player, I think it's because there is no load ! There is only one connector (15 pins) 1 VF+ 2 VF- 3 -27VA 4 5.2VA 5 PWR_CTL 6 D.GND 7 5V 8 12V 9 A.GND 10 3.3V(1.8V) 11 3.3V 12 3.3V_M 13 D.GND 14 8V 15 M.GND My questions are: Do every power rail needs a load ? If so, which one and what king of load, just a resistor ? What would you do to make it work outside the player ? Thank you ! |
| wasedadoc:
I would try loading at least the supply that is monitored in the feedback loop. Finding a schematic is probably the easiest way of determining that. |
| guizmo1967:
Here is the schematic of the power supply ! |
| guizmo1967:
Remember, this power supply was working fine when plugged in that DVD player ! I don't have that DVD player anymore, I just kept the SMPS. I get voltage on the first 4 pins only and it is fluctuating, not stable that's why I think it needs a load. Do I put a resistor between pin 1 and 2 ??? This is my readings: Pin 1: -15V (not stable) Pin 2: -22V (not stable) Pin 3: -27V (not stable) Pin 4: +4.98V (not stable) On the schematic, pin 3 and 4 are marked VA ?? |
| Navigation |
| Message Index |