Fosgate 1000a2 with blown output - diyAudio
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Old 26th February 2009, 02:48 PM   #1
81300sd is offline 81300sd  United States
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Default Fosgate 1000a2 with blown output

I am going to try to repair this. Any help is appreciated.

All of the components with red arrows are confirmed blown

Click the image to open in full size.
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Old 26th February 2009, 03:04 PM   #2
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Do you have a variable temperature soldering iron?

Do you have a small butane torch?

Did you check for rail voltage on the blown channel when it was powered up?

In the defective channel, pull all of the 0.1 ohm source resistors and cut the output transistors free from the board. Confirm that all of the small surface mount resistors are within tolerance. The 100 ohm and 33 ohm are the most likely to have failed. There are ~20 100 ohm resistors to check.

You should replace Q321, 322, 324 and 325 even if they appear to be OK.
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Old 26th February 2009, 04:56 PM   #3
81300sd is offline 81300sd  United States
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My butane torch doesn't seem to be working anymore so I need to go get one.

It does have rail voltage similar to the other side.

I have cut it all free am now testing.
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Old 26th February 2009, 04:59 PM   #4
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The Radio Shack torch works well.
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Old 26th February 2009, 08:35 PM   #5
81300sd is offline 81300sd  United States
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Just got back with a rad shack torch and a better multimeter

R379 - 6.9k

R372 - 100.5

r378 - 4.39k

r370 - 99.6

r377 - 3.31m

r368 - 99.5

r376 - 3.39k

r366 - 99.5

r375 - 206k

r364 - 99.6

r382 - 4.55m

r383 - 24.1k

r384 - 59.1k

r385 - 35.6k

r380 - 2.14k

r381 - 489

r386 - 813

r387 - 31.5

r330 - 10.3

r332 - 22.4m

r345 - 99.5

r327 - 100.5

r329 - 470

r361 - 158k

r351 - 66.6k

r345 - dead

r359 - 101.9k

r358 - 20.02k

r357 - 56.3k

r355 - 15.3m

r356 - 817

r360 - 30.2k

r353 - 20.01

r354 - 509

r326 - 22.3

r350 - dead

r341 - 68.4

r349 - 46.6k

r330 - 101.2

r348 - dead

r337 - 99.7
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Old 26th February 2009, 08:35 PM   #6
81300sd is offline 81300sd  United States
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Going thru it again with the schematic. I missed some and some may be misnumbered.
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Old 26th February 2009, 08:50 PM   #7
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You don't have to post them unless you don't know how to read the value. If you post them again, post the markings also.
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Old 26th February 2009, 09:11 PM   #8
81300sd is offline 81300sd  United States
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Ok, so what I have found bad is

320
355
361
391
374
352
351
343
341
350
349
348
379
378
377
366
376
375
380
382
386

I do question these. Not sure what the tolerance is.
383 marked 2002. Tested 17.56k
387 marked 303. Tested 27.5k
384 marked 563. Tested 49.5k

Is there anything else I should be checking?
How many watts are these .1 ohm resistors?
Where is the best place online to get all these parts?
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Old 26th February 2009, 09:36 PM   #9
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The ones you're not sure about are probably OK. There's likely something in the circuit that's skewing the readings. Compare these to the ones in the other channel.

Mouser is probably the best place to get the parts.

Mouser part number for 0.1 ohm:
71-LVR3-0.1

The SMD resistors are in two sizes. The smaller ones are 0805. The larger ones are 1206. You'll need to order the correct ones. Order extras. They're inexpensive. On the schematic, the ones with a 'B' suffix are 0805. The ones with a 'C' suffix are 1206.

The SMD resistors that have 4 digits are 1% tolerance components and need to be replaced with 1% components. The ones with only 3 digits are 5% tolerance and can be replaced with either 1% or 5% tolerance components.

You also need to check the protection circuit transistors. They are:

Q226
Q227
Q228
Q229
Q230
Q231
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Old 26th February 2009, 11:16 PM   #10
81300sd is offline 81300sd  United States
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Ok some of the transistors are bad too. What am I looking for at mouser for transistors? Got everything else ready to order.

I am ordering twice the parts I need, might need them later anyway.

Edit,
Nevermind I figured it out. Just have to wait on parts. I think I will start playing with some other stuff getting my soldering mojo going
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