Thread: Seig C3 CNC spindle problem
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14-08-2018 #11
looking at the circuit diagram I linked to
this a simplified diagram of the low voltage supplies to the control circuit
R17 is the large resistor on the board
its value is 15 K (15000 ohms)
in parallel with a 100K resistor that gives you a total of 13K
if you get more than 13K then R17 will need replacing
has R17 changed colour ?
the resistors drops the rectified mains down to 22V at terminal K4 is linked to K3
with K3 & K4 open circuit I would of expected you to have 200V DC
if terminal K4 was shorted to earth
a number of semiconductors will need checking
starting with Z1 the 22V zenner and the 78L12 regulator IC
JohnLast edited by john swift; 14-08-2018 at 01:23 PM.
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The Following User Says Thank You to john swift For This Useful Post:
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15-08-2018 #12
The machine in question is in fact my X3 mill and not the C3 lathe.
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