CTEK D250s dual repair needed
Submitted: Friday, Sep 08, 2017 at 03:50
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FourbyPhil
Hi,
Has anyone got a photo of a D250S circuit board, or a circuit diagram for it?
I have damaged a diode (D9) and need the part number thats printed on it. I might have connected up solar panel reverse polarity and fried it... no info on ctek site or others.....
cheers
phil
Reply By: RMD - Friday, Sep 08, 2017 at 10:24
Friday, Sep 08, 2017 at 10:24
If you know it is a diode and whch way around the band at the end was, then replace it with a high voltage diode of similar size. The sizes are an indication of the current rating, bigger won't hurt.
However, if a small diode, ie, glass envelope, it could be a Zener diode and knowing the voltage then would be required for correct operation.
If the unit is old and had plenty of use, the electroylic capacitors may be the cause of the diode failure because the circuits action may be incorrect and switching of semiconductors has drawn more than usual amps through the diode.
I recently repaired two swichmode power supplies where electrolytic capacitors had become ineffective. One did require a diode and electro's replaced. Both now work again. The concepts are quite similar in switching DC DC units.
Ctek won't give you any info, they want to sell a new one to you, not have you repair the one you have. They will only say, return to maker for service/repairs.
AnswerID:
613609
Reply By: PhilDo - Wednesday, Nov 01, 2017 at 22:42
Wednesday, Nov 01, 2017 at 22:42
Hi Phil
Today I blew my D250S fuse F1 and probably the diode D13 too. I stupidly connected the battery incorrectly in my haste. Now I can't figure how to remove the 30A fuse without removing the board, thought the blade would just pull out.
Any help please and my hand is up for a diode if you still have some.
cheers
Phil
edit: Looks like D13 is a different type to D9. Still can't figure why the blade fuse doesn't come out. Didn't really want to remove the board if I don't need to.
AnswerID:
614698
Follow Up By: FourbyPhil - Saturday, Nov 04, 2017 at 09:12
Saturday, Nov 04, 2017 at 09:12
Hi PhilDo,
The fuse is soldered to the board..... Need to scrape off the waterproof wax first then you can free up the fuse...
Good luck with it.
Cheers
Phil
FollowupID:
885427