June 2, 20251 yr Hi all, thanks for reading. I have a kodak 5kw , came in for error 9 . I found two igbts blown into pieces, replaced all 9. I have also replaced the gate resistors and optocouplers too. As soon as I start up it blows the 470uf cap in the switching power supply , I removed and checked all the surrounding components and can't find a reason why the cap would blow its top all the time . Has anyone else experienced this ?
June 8, 20251 yr On 2025/06/03 at 2:51 AM, Bas84 said:As soon as I start up it blows the 470uf cap in the switching power supply ,It looks like it's near the 7912 -12 V voltage regulator. Perhaps the diode feeding it is shorted. Electrolytic capacitors don't like being fed AC.Edit: I'm assuming it's the green smallish one, not one of the two giant bus capacitors. Edited June 8, 20251 yr by Coulomb
June 8, 20251 yr Author Hi sir , that's correct .The green one is the 470uf . I'll take those diodes out of circuit and start there , I was also thinking about changing the regulator.Thanks for your time and help.
July 11, 20251 yr Author Hi @Coulomb Sir , it was one of the mosfets with a slight crack I didn't see the first..second ..ot third time.Tested fine in circuit , so didn't notice. Thank you very much for the help
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