Electronics > Repair
SMPS from Marantz UD-5007 defective
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Vintagelover:
Hello guys,

In the meanwhile I replaced some parts.
I replaced ZD507, no effect.
I replaced the optocouplers U505 and U502, no effect.
I replaced the regulator U503, no effect.

Now I don't know anymore what could be the cause.
This should be relatively simple, no?

Can someone point me in the right direction?
mario_nks:
Hello, have you replaced the capacitors yet?
CE503
CE502

Then look for a short on the secondary side. Possibly one of the diodes is broken (short circuit)
D511
D512
D509
FIXITNOW2003:
also check main cap  100UF 450v
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