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fxglider
Junior Member
Last Activity: 04-16-2021, 08:12 AM
Joined: 03-26-2021
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  • I have finally I think cleaned all the connections . I did not clean connection on the outputs terminals where you hook up your welding leads . Plus did not clean leads going to what I think is the intensifier and input leads to transformer . , I was afraid taking apart things and breaking fittings...
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  • Thanks Jjohn76 for the advice . I have taken ac dc switch and polarity switch a part cleaned it and put new bolts except a couple that I couldnt get out . I will re check to see if I missed something . I have not checked to see maybe in between the cable and the cable lug ends have a bad connection...
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  • Wow thanks for the info . Now I see when welding in dc all the scr work and also the gate driver . So does that really mean they must have to work in ac. Hmm i guess so . I was wondering the wires out of pc board labeled 34 and 33 that go to the gate driver give different signals when in dc or ac...
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  • Thanks Aeronca that helps alot . I had no idea there was 2 schematics for ac because the the different flow of electrons . Now it makes a lot more sense . On the green copy it cut off the z2 reactor and couldnt tell if power went threw there . It would be great to see how the power flows in dc . On...
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  • I am still wanting to try the oscilloscope again now that I cleaned more connections . I was trying to figure on the schematic how the power flows to the gate drivers then to the scr thyristors and then out of the machine . When I look it seems there are more then one paths so that makes no sense ....
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  • Thanks everyone for the input . We put a scope on the wires and the readings my friend thought was strange . All the readings is with the pedal pressed . We checked the wired out of the pc board to the gate drivers (fc1 and fc2 ) . The first test was on fc1 .The wire out of pc 33 becomes 122 and...
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  • Thank you every one for the advice , Thursday I am putting a scope on the wires that come out of the pc board and go to the gate drivers and thyristors . I hope we can find out if its the pc board giving us troubles . If the pc board is giving a signal then in might be the scr or thyristor . I have...
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  • Thanks for the help . The serial number is jd683309 the welder is a 300 sycrowave from 1983 . It has the switch and I unbolted and cleaned every connection and even replaced almost every bolt. Between the bolted surfaces it looked good . I have 2 sycrowave 300 welders and they both do the same...
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  • I checked the voltage from work terminal and electrode terminal while machine is in ac ..The voltage in ac without pedal pressed is zero .When I press the pedal I get 75 volts ac The strange thing is on the machine the voltage gauge reads 35 volts . Then when I switch to dc without the...
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  • sycrowave 300 wont weld in ac but works in dc

    I have a 1983 sycrowave 300 that works in dc while tig welding with the foot pedal . It also arc welds in dc fine . When i switch to ac all I get is the hi frequency arc and maybe 20 amps on the gauge . I also tried arc welding in ac and got nothing . I even tried with out the foot pedal and nothing...
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