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amc32 8th April 2008 11:03 PM

lanzar optidrive 2500 abortion
Hard to believe me eyes.I bought a us-made lanzar 2500 as-is for cheap. Not hard to believe it didnt worked. But the damage found rd to believe. Totally impossibe to read power supply fets and smd drivers,need help with picture and/or replacements

Perry Babin 9th April 2008 12:06 AM

Is it like this one:

amc32 9th April 2008 08:48 PM

thats the one Perry. The small drive trans. in question are
Q: 64,63,86,60,62,and an unreadable trans # between Q62 and Q60

Perry Babin 9th April 2008 09:44 PM

These boards are very easily damaged. Be careful when pulling the old parts.

I have information on a 50C and it should be essentially the same as your amp. The circuit board designations are for the 50C. You'll have to confirm that they're the same in your amp.

These notes are from an amp that had been repaired before. I think the original transistors were 2N4401/4403 (NPN/PNP).

FET drivers for one bank of FETs
Q63 - PNP
Q64 - NPN

FET drivers for other bank of FETs
Q61 - PNP
Q62 - NPN

If yours has different designations, you can determine which ones to use by checking continuity. The collectors of the PNP transistors of the emitter follower pairs go to ground. The base and emitter of the NPN/PNP transistors of the follower pairs are directly connected.

Protection Circuit
Q86 - PNP

I'm not sure about the unreadable transistor. The only remaining semis in that area are a regulator (U9 - TL431) and a PNP transistor (Q60 in this amp)..

The FETs in the amp I repaired were IRFZ40s. IRFZ44s would be a good replacement.

pulsarhks 20th April 2008 08:41 PM

lanzar opti 50c
hey, i have a lanzar 50c opti drive i think that the FETs are nakerd on it, where can i get the FETs from, i think that they are IRFZ40s but can u put IRFZ44s in it ??? cheers matey.

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