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Rockford Fosgate 800a2 repair
Rockford Fosgate 800a2 repair
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Old 13th October 2019, 08:28 AM   #11
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
The resistors I recommended are not wirewound. They are metal strip resistors and their design is similar the the resistor below. Wirewound resistors typically have an actual metal wire wrapped around the core. They are good for surviving surges (many 10x above ratings).

Use whatever you'd like. It's not a critical issue. It's likely the least critical aspect of this repair.
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Last edited by Perry Babin; 13th October 2019 at 08:31 AM.
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Old 13th October 2019, 03:53 PM   #12
objext is offline objext  United States
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Join Date: Mar 2005
Location: CA
Quote:
Originally Posted by Perry Babin View Post
The resistors I recommended are not wirewound. They are metal strip resistors and their design is similar the the resistor below. Wirewound resistors typically have an actual metal wire wrapped around the core. They are good for surviving surges (many 10x above ratings).

Use whatever you'd like. It's not a critical issue. It's likely the least critical aspect of this repair.
I see. They call them wirewound, but looking at the data sheet it's only they higher wattage that actually are.

I split my order up between Mouser & Future after comparing prices. I was able to order 50 each of the FETs, and will try to sell off the extras when I'm done.
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Old 18th October 2019, 04:18 AM   #13
objext is offline objext  United States
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Join Date: Mar 2005
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Got all my parts in. If N87K is the date code, then they seem to be all the same. There's also the tiny recessed circle with varying microscopic printing (eg L50, L55, L56, etc).

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Old Yesterday, 05:34 AM   #14
objext is offline objext  United States
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Join Date: Mar 2005
Location: CA
Pulled all the output mosfets and went through all the resistors on the right channel. The following are open:

R340
R342
R344
R346
R347
R366
R368
R370
R372
R374
(Above were all removed before any further testing)

R328

R334
R335

R338

R362
R363
R364

R355

R357 reads 76.8k or 99.6 depending on polarity, which is similar but not exactly the same as the R257 on the left channel.


I suppose the next step will be testing diodes and transistors in these paths?

Last edited by objext; Yesterday at 05:38 AM.
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