parallax power supply 7345ru parts PWM
My 7345 is not charging the coach batteries but does supply 12power to all accessories. The transformer, fan and relays work fine. Think i need a PWM circuit for it. Contacted PP tec support and th...
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They all have the burned area under the resisters - normally the resisters are fine no need to replace the pcb trace however does need attention - solder in a wire to repair the traces - Q13 is good as well
That cap behind Q13 is defective replace it
Take a close look at those 200Vdc 1,200ufd caps if they show any signs of failure replace them
As suggested earlier get yourself a nice ESR meter - a DVM aka DMM is useless when checking caps - Good ESR meters use about 150Khz with less than 400mv so should not forward bias any semiconductor junctions incircuit testing is very simple
You should be good as new with less than $5.00 in parts
That cap behind Q13 is defective replace it
Take a close look at those 200Vdc 1,200ufd caps if they show any signs of failure replace them
As suggested earlier get yourself a nice ESR meter - a DVM aka DMM is useless when checking caps - Good ESR meters use about 150Khz with less than 400mv so should not forward bias any semiconductor junctions incircuit testing is very simple
You should be good as new with less than $5.00 in parts
