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archie21 20th January 2012 05:36 AM

directed d2400
does anybody have a picture/ know which transistors go where on the d2400 board? i cant find a picture of them without heatsinks...
the previous owner has removed ALL of them and these are what i have in a pile in front of me...
12- IRFZ44N
6- IRF640
6- IRF9640
2- TIP41C
2- TIP42C

i went through them with the meter and a few had shorts so he was on the right track i guess lol


Perry Babin 20th January 2012 08:25 AM

I don't have any information on that amp specifically.

There are likely more IRF9640s on each side. The 3rd leg of all of the 9640s will be directly connected. The rest of the outputs are IRF640s. The 3rd leg of all of the IRF640s will be directly connected. Check for the direct connection with your meter.

The center legs of the IRFZ44s will be directly connected to the B+ terminal (or so it will seem when you measure the resistance with your meter).

Do the TIPs have Zener diodes connected to their first leg?

archie21 22nd January 2012 01:06 AM

When you say there are likely more 9640's on each side are you referring to quantity or relative positioning? I believe he bought the amp new so those would be what originally came in it. As for the zener diodes, yes there are two on each end near the rca jacks on one side and the terminals on the other. I didnt notice before but the markings on the board have the mount filled in on one of the two end transistors and one that's like the rest. Would that indicate a different pinout orientation of that transistor? I tried looking up the TIP41's and 42's but i couldnt find a clear difference between the two. Thanks for helping me out so far perry. Im kind of a rookie at amp repairs but im master ase certified in automotive so, with some *intense* research and your help, i will definitely get this amp going!

timwebb 22nd January 2012 02:07 AM

is this the old one or the newer one?

archie21 22nd January 2012 02:21 AM

The older style i believe. It has the 2 transformers and 4 caps arranged symetrically. I can post pictures of the board if it would help.

timwebb 22nd January 2012 02:58 AM

that would help.

archie21 22nd January 2012 03:12 AM

these are the markings i was referring to (Q83, Q84)

this is the board i have... this specific picture is from a post by mike49504

timwebb 22nd January 2012 03:26 AM

u can normally tell how the traces around the output transistors are thinking its 4 9640s and 2 640s per side in this amp.

archie21 22nd January 2012 03:30 AM

what about the TIP42's and 41's? i still cant find a difference between them

archie21 22nd January 2012 03:34 AM

wow nvm... 41 is npn 42 is pnp... huge oversight on my part lol

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