Author Topic: hakko 850  (Read 4473 times)

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Offline nanotech

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hakko 850
« on: September 11, 2013, 03:28:41 pm »
hi all im new so please be gentle   :-[
i have a problem and i hope you can help.i have a hakko 850 which has the motor running constantly when the power switch is off , also when i switch the machine on the heating element goes on full blast and then i have to switch off straight away to avoid it burning out . i love these machines and they go on forever and i would hate to throw this one away unless i can fix it ,if you could let me know what could be the problem and how i could trace it i would be very grateful  thanks in advance
 

Offline nanofrog

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Re: hakko 850
« Reply #1 on: September 11, 2013, 06:42:39 pm »
Hope this helps.
 

Offline nanotech

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  • Posts: 2
Re: hakko 850
« Reply #2 on: September 14, 2013, 09:38:17 am »
hi thanks for the schematic but i havent got a clue where to start  |O
can somebody please enlighten me as to which components i should check first and which ones i should be replacing  :-+
 

Offline SeanB

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Re: hakko 850
« Reply #3 on: September 14, 2013, 09:55:43 am »
With the fan running all the time I would guess checking C7, C10 and the 555 IC, along with the triac TH2, and D3, C9, Q1, Q2 and Q3. Heater on all the time check TH1 for a short, and if it is fine then the UPC1701 and C2, PUT1 and the wiring to the pots and the pots themselves if they are open circuit.
 


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