Weller WS81 fail please help

Thread Starter

kwm488

Joined Jan 26, 2014
2
Hi
I own Weller ws81 and used 1.5yr. But the fuse is keeping blow now.

I did follow to fix it. But it doesn't work.

1. I replace Triac (BTA12-600B). The fuse is not blow now. I can turn on solder. But the fuse will blow again after 30sec. It looks like the new triac dead again.

2. I guess the solder heater short. So i replace solder heater and traic. But the fuse keep blow.

3. I think ic have problem. I change all ic in the pcb. But it is the same.

4. I checked all smd resistor. It is no problem.

Last, the transformer voltage is correct

Please help
 
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