I have a couple of d-link wirless accesspoints on whose power supplies have failed - they should deliver 5volts at 2 amps. The power supply takes the form of a slim-line plug pack. Inside the pack is a little switch mode power supply. I'm looking for some tips on what to look for in repairing this item. there is nothing obviously wrong on a visial inspection. Fuse is intact, no heat stress on the board, no visually distressed components. Just nothing on the output. On the board there is a pwm chip - CM3842 - an 8 pin device. There is 8 volts on its Vcc pin (pin 7) - nothing appreciable on any other pins. On there board there is also a 3 legged semiconductor - probably a FET - Number is ST W55403 (then Morocco P4nK602 FP0) it's an all plastic device - ferrite sleeve on its middle leg. It has 320 DC volts on its middle leg - nothing on either of the other 2 legs. Windings of the transformer show continuity. I'd like to get this working again - I've been quoted $55 for a replacement. Pic of the board can be seen at:
- posted
17 years ago