| Electronics > Repair |
| Help Please, Switching Power supply shutting stright off. |
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| JFerris321:
--- Quote from: Poroit on June 09, 2024, 05:51:49 am ---Looking at your original post where you said the PSU was working out of the case at 11.6V. Did you try adjusting the trimpot to see if it increased the output? Also...when you put it back in the case and power it up...does it trip your home/workshop Earth Leakage Breaker --- End quote --- Im afriad it has no trim pot and no it does not trip the RCD. In regards to the diodes, i have tested all the diodes on the supply with my multimeter in diode test mode and they all seeem around the figure i would expect. |
| JFerris321:
Out of intrest do anyone have any adea would i should expect to happen if the capacitor at c8 (i presume this is the vcc supply but not sure as i can not identify the chip, markings are 3882 with 701 under that) was changed from 10uf to 12uf? |
| SeanB:
Have you tried resoldering the transformer pins, and the pins of the secondary rectifiers. They look suspiciously like some are dry jointed, which will do that. |
| tautech:
--- Quote from: JFerris321 on June 09, 2024, 03:31:12 pm ---Out of intrest do anyone have any adea would i should expect to happen if the capacitor at c8 (i presume this is the vcc supply but not sure as i can not identify the chip, markings are 3882 with 701 under that) was changed from 10uf to 12uf? --- End quote --- Short form datasheet: https://www.mouser.com/datasheet/2/308/KA3882C-1295487.pdf |
| asis:
Which chip is designated U3 and what is the orange wire next to it? This TACHO fan? I don't see the REF chip (TL431), or is it in the module next to Q8? Q2,Q3,Q8,D6 types? It is necessary to evaluate the condition of the thermal insulating gasket and look at the type of dual diode of the +5V channel. We need a picture of the PWM module U1. In principle, I can bring the scheme to the absolute level if you help me with determining the denominations |
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