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Old 8th February 2011, 12:58 AM   #1
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Default rockford fosgate BD1000

Got another one of theese amps in for repair. Wondering if i can cut the mesha board here and repalce it with a small section of mesha board out of a scrap amp?

Since i dont have a mesha board long enough for this amp.
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Old 8th February 2011, 01:31 AM   #2
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Technically, you could use kapton tape and heat sink grease or Sil Pads if you were willing to make buss bars. If you are going through the trouble to cut a MESHA board, you may as well just de-solder the bad transistor(s).
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Old 8th February 2011, 03:08 AM   #3
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Still have problem with this amp after replacing the fets and drivers i get no gate signal and amp draws excessive current. I unsoldered the twisted wires and still draws excessive current.


With the power supply fets removed I have the following voltages on the SG3526N

1:11.34
2:6.32
3:10.67
4:11.11
5:11.37
6:6.82
7:6.62
8:6.82
9:10.86
10:8.58
11:6.82
12:11.37
13:6.82
14:13.20
15:6.82
16:6.82
17:13.21
18:11.40
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Old 8th February 2011, 03:50 AM   #4
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Location: Louisiana
You could use the MEHSA insulator out of another identical amp but you have to cut it in a way that won't deform it. If you try using tin snips or something similar, the insulator will not remain perfectly flat,

Pin 15 should be at 0v.
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Old 8th February 2011, 04:08 AM   #5
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PIN 15 connects to pin3 of U7 (LM6361N) Theese are the voltages i have

1:2.29
2:3.23
3:6.83
4:2.28
5:0
6:3.28
7:4.28
8:2.28

Defective?
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Old 8th February 2011, 04:13 AM   #6
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I'm sorry, I should have said it should be connected to ground. Pin 15 is the ground pin for the 3526.
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Old 8th February 2011, 04:23 AM   #7
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I tracked it back to U7 then back up to the drivers for the power supply fets But no connection to ground terminal
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Old 8th February 2011, 04:29 AM   #8
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OK heres what i have on the LM339

1:6.84
2:6.84
3:13.21
4:6.90
5:8.41
6:9.05
7:11.40
8:6.38
9:6.38
10:11.40
12:6.82
13:6.84
14:6.84
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Old 8th February 2011, 05:35 AM   #9
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What is the DC voltage on these two points?
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Old 8th February 2011, 06:03 AM   #10
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The point next to the rail cap i have 0 volts. The point next to the tantalum cap i have 4.92 volts
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Last edited by mike49504; 8th February 2011 at 06:05 AM.
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