On Wed, Jun 28, 2017 at 03:17:00PM -0600, Terry Raymond wrote: >What pins on the power switch can I jumper? I think that you can use an ohm meter to measure the resistance between all pairs of pins, in both the ON and OFF position of the switch. This is obviously without any power cable connected. Ignore any readings that are above some tens of ohms. If the connection is good, it should be very close to zero ohms. If the switch indeed is a problem (say, there is some dirt or corrosion inside), the resistance could vary when you are gently rocking the switch in the ON position. When it comes to the power connector, I think that the only possible failure mode should be corrosion or mechanical damage, or a bad soldering on the circuit board. You could add some new solder and flux and then measure the resistance between the circuit board and the pins on the outside. I think it should be more likely that the power cord from the power supply is damaged, for example if the cable has been bent heavily. Have you checked the power supply with another machine? >I will check all the points you mention Mike. I did already check U59 >Regulator it is getting 12V. Did you measure all voltages on the power connector solder pads on the circuit board? Do the voltages remain stable if you gently rock the switch in the ON position or if you bend the power cord near the connector or the brick? Marko Message was sent through the cbm-hackers mailing listReceived on 2017-06-29 10:00:03
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