Electronics > Repair
Help for open frame dual output PSU - model FSP012-2P01
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Cavia:
Hello,

I'm trying to repair an old (retired) open frame dual output PSU: model FSP012-2P01.
This model is commonly found inside old Extron devices (i.e. 201Rxi, DVI-RGB 150, and more). Since Extron does not provide any schematics (as per company policy), I need some experienced soul that can help me debug the problem (I also contacted FSP asking for the schematics of this retired device, but I got no answer so far).

Let's jump into some details. The model FSP012-2P01 (produced by FSP) is a dual-output PSU with the following outputs: 5V at 1.5A and -5V at 1A.
Note: Regarding a possible substitution with a similar device, the only candidate I found is a Meanwell PD-2505 which unfortunately does not fit into the Extron case. I may keep the power supply outside the Extron in a 3D printed case and route the cables to the logic board, but I would like to keep this option as the last solution.

The faulty PSU is showing the usual ticking [tik tik tik] cyclic-reset behavior. I've already replaced all the capacitors, checked the diod+high resistor (measured 15kOhms) line next to the transformer and looked for shorts. Could not find the problem  |O
As I'm not an electrical engineer (or expert), I'm a bit lost now. Any help would be greatly appreciated. If needed, I can setup a video call with anyone who wants to help me live (I have a streaming position at my bench).

Here are some pictures of the PSU.

Thanks all.
voltsandjolts:
Check as many passives and diodes as you can in circuit.
Then I would probably try replacing Q10 and U30 if you can get new ones. What are they?
wraper:
You say replaced all caps, but did you replace small electrolytic cap on primary side, just in case? Check if diodes on secondary side are not shorted.
wraper:

--- Quote from: voltsandjolts on April 05, 2023, 04:25:46 pm ---Check as many passives and diodes as you can in circuit.
Then I would probably try replacing Q10 and U30 if you can get new ones. What are they?

--- End quote ---
Q10 would simply short and blow the fuse when fails. Also does not look like UC3842 issue. I suggest checking its datasheet for typical schematic. This also could be an issue with resistor on it high voltage power input or faulty diode from auxiliary transformer winding.
FIXITNOW2003:
some info here

FSP012-2P01

https://goughlui.com/2015/07/12/salvage-teardown-extron-dvi-rgb-150-iluv-usb-charger-nvidia-9600gt-oem/
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