Electronics > Repair
Zodiac Tri Pool Chlorinator Repeated Zener Diode Failure
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fzabkar:
Sorry, I missed the earlier reference to TVS diodes.
Frankster:

--- Quote from: fzabkar on December 29, 2018, 07:28:15 pm ---Sorry, I missed the earlier reference to TVS diodes.

--- End quote ---

Don't be sorry, glad you are the second to suggest it!
MTBACHO:
Hello !! hi to everyone! I am new to this forum! but found this post very very helpful as I have been able to gather very useful information on how the power board of the Zodiac works.

I have repaired in other ocasions smps and this board is composed of several smps! this time I am struggling to find the IC u6 of my board, as it blew as it failed into a short circuit. Photo attached. I am missing part of the ref number. I have found some similarities to the schematic Frankster has uploaded!
I was wondering if anyone could help me out find the ref number of the U6 Ic driver.
Many thanks in advance!!
 
Uunoctium:
The blown IC U5 is marked U1 in schematics above. But that's not all. In yor PCB resistor R17 looks like it is infinite and both are surely caused by failure of Q5
MTBACHO:
Hii! Thanks Uunoctium! I have seen that R17 has had some wear and tear bur still tests a good 22k! Q5 and Q5 tests good also. What dic go short circuit was myD25 zener diode! As I see it the pcb that I uploaded has some differences with the schematics that has been uploaded! U2 on my board seem more likely to match U1 of schematics, With ref NCP1653A that drives the PFC mosfet. My U6 is for the low voltage power suppky that goes to the control board, a 15v line. The difference with the schematics is that it is generated differently. I have a dedicated smps for this, where the schematics show a 230 to 15v transformer and a bridge rectifier configuration. The U6 chip on my board is a DIP8 with 5 pin in use, as pin 3-4 are joined ans 6-7-8 also. as shown in the drawing that I have tried to trace back. Q2...VA is the only letters remaining and have not been enough of a clue to find a IC that does the job!  Anybody who has a chance to upload a photo would be of great help!
Best regards!
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