pf.hal1984
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And this wiried correctly? Wire from th wiper attaches to pin A and my green ground wire to pin B.
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MEP005A 5volts only
- Thread starter pf.hal1984
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No, just phase on one side and neutral on the other
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How many ohm and how many va on rheostat?
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Your questions make wonder if you can read / understand the wiring diagrams I posted
pf.hal1984
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100w 100ohm
pf.hal1984
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I never worked with AC. Only DC
pf.hal1984
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Test one is a pass 21.5 vdc
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Take the white wire off the rheostat, connect it to one side of R2 if this neutral.
Leave black wire on rheostat if this is your phase 120VAC, connect wiper to other side of R2 - apply power and adjust to 95VAC across R2 - then check voltage on VR board in DC range
pf.hal1984
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When I do it this way I cannont get voltage below 100.
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Ok, as long it doesn’t overheat the rheostat - now the remaining tests
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For test 2 I would leave only the phase 240VAC connected to rheostat and connect wiper to T2 H1 and The other phase of 240VAC connected to T2 H2
Adjust rheostat to 208VAC across T2 H1 and H2
pf.hal1984
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51vdc
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That’s good, pass now onto test 3 - you may want to connect your rheostat to 120VAC as in test 1 with phase and neutral - set to 12VAC apply that to each coil system as in wiring diagram
pf.hal1984
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Yellow I get 4.7vdc. Green I get .1vdc . And red is 2.5vdc.
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Ok, check the six Diodes CR1 to CR6 for short - you may have to desolder each lead to test each Diode individually - if your meter has Diode test, then note voltage drop in conducting direction and check that the diode blocks in block direction
pf.hal1984
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Ok. I have to continue tomorrow because it's date night and I need more solder. Thank you for your patience I learned a lot more today about DC and now am more confident with this machine.
pf.hal1984
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All the diodes are blocking properly. CR1 613, CR2 571, CR3 500, CR4 514, CR5 586, AND CR6 589
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Ok, desolder R1 and R3 and check resistance, if they check Ok, take a close look at T1 - check primary coils for dc resistance - if they check ok check Q1 and Q2
pf.hal1984
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Desoldere Q1. I got 167 across both legs. This diode has two legs unlike the others. If I did this right., then it's not blocking properly.
pf.hal1984
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Oh and 16 ohms on T1