Rescued a Compaq D51C computer
It has a deeper sized PSU than usual
The PSU fuse, and a MOV that was across a primary cap, were blown
The MOV is a zinc oxide varistor Z151 04U2, and i found another MOV on another parts PSU (that was also across a primary cap) that is a TVR 10241.
The clamping voltage is the same, but the peak current for the Z151 04U2 is 3500amps/2500amps, and for the TVR 10241 it is 2500amps/1300amps (whatever that means), even though it's a bit bigger in size - is that because it's not a zinc varistor?
Is it perfectly acceptable to replace the original MOV with this, despite the difference in "peak current"?
And does a clamping voltage of 395V mean that the voltage across one primary cap went higher than 395V? - that seems very excessive, since the primary caps are rated at 200V.
What could have caused the voltage to go that high?
It has a deeper sized PSU than usual
The PSU fuse, and a MOV that was across a primary cap, were blown
The MOV is a zinc oxide varistor Z151 04U2, and i found another MOV on another parts PSU (that was also across a primary cap) that is a TVR 10241.
The clamping voltage is the same, but the peak current for the Z151 04U2 is 3500amps/2500amps, and for the TVR 10241 it is 2500amps/1300amps (whatever that means), even though it's a bit bigger in size - is that because it's not a zinc varistor?
Is it perfectly acceptable to replace the original MOV with this, despite the difference in "peak current"?
And does a clamping voltage of 395V mean that the voltage across one primary cap went higher than 395V? - that seems very excessive, since the primary caps are rated at 200V.
What could have caused the voltage to go that high?
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