Gallery, Projects and General > How do I??

poorly seig c3

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davidcurtis021:
hi all

hav'nt been around for a while but could really use some help. On Sunday my machine suddenly died in it's sleep. it didn't give any warning symtoms just failed to restart after tea. it appears to be electricly comatose but i can confirm with basic testing that there is power in up to the emergency stop switch the internal fuse is ok and the motor does run when connected to my 18v drill battery.

i also put a multimeter over the transformer and while i got a reading between the two outer terminals on the secondary coil. i get an out of range reading for the centre one. does this mean the transformer is kaput.

is there also anything else simple i should be checking.

John Rudd:
From what I can see on the print side of the board, the centre pin isnt connected to anything....
That said, it could be that the transformer is centre tapped...
Need to see what is on the component side of the board....

davidcurtis021:
hi
thanks for the help there is definately a connection in the centre i, tried to get a photo but my camera wont stay steady enough,



 i also tried to get some other views of the top.

John Rudd:
What is the chip at the end of the board next to the 2 pin socket?
I'm guess its a 7805 regulator..

With power applied, is there any voltage at the two pin socket?
I looked at the photo above in your album, looks like the secondary of the transformer isnt centre tapped....the two outer connections go to a 4 diode bridge, then the regulator....

davidcurtis021:
hi
yes that is the number printed on it when i put the multimeter on the underside of the 2 pin socket i got a reading of 56.7mv in dc i assume that is 5.6volts

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