Problems with Zen V4

[Odysei]

I'm having problems with Zen V4, it isn't working. It's 1.3Amp version. When I turn power on r0 shows 0,68V it lasts about 2secs and then it drops to 0V. When I unload main power capacitors to 2V from 51V and restart the amplifier, it happens the same way everytime. Voltages everywhere else are alright. All Transistors are installed right and works 100% (they're not dead after events), all 0,47ohm resistors are fine, all capacitors loads and unloads 50V current. The amplifier is as cold ice I mean mosfets don't get warmer at all. Right voltages exists from D to S, but I think no current flows through them.

Any advice is welcome.

Thanks

[pro]

Try to recheck all the weldings, some one could be 'cold'.
Ciao.

[Netlist]

Originally posted by Odysei
Voltages everywhere else are alright.....
Right voltages exists from D to S,

Do you mean ALL voltages are OK everywhere except for the power mosfets?
What voltages do you get at both IRFP's?

/Hugo

[kropf]

You may be charging a capacitor that ends up shutting off the current source. Check to see that the two 220uF caps are wired correctly.

I finished troubleshooting my new Zen V4 two weeks ago - it works great now. I designed my own boards and it turned out that I missed one copper track.

Good Luck,

Jeremy

[Odysei]

q1 voltage 23v, q2 - 21v, as I said all normal. Very strange, I can't think of any solution

[Netlist]

Originally posted by Odysei
q1 voltage 23v, q2 - 21v, as I said all normal.

I could be wrong and I can't figure out why it isn't like that but should the source of Q2 not be something like 0.66V positive against the drain of Q1?

/Hugo