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mike49504 8th February 2011 12:58 AM

rockford fosgate BD1000
 
1 Attachment(s)
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.

0ldSch00lf00l 8th February 2011 01:31 AM

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).

mike49504 8th February 2011 03:08 AM

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

Perry Babin 8th February 2011 03:50 AM

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.

mike49504 8th February 2011 04:08 AM

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?

Perry Babin 8th February 2011 04:13 AM

I'm sorry, I should have said it should be connected to ground. Pin 15 is the ground pin for the 3526.

mike49504 8th February 2011 04:23 AM

I tracked it back to U7 then back up to the drivers for the power supply fets But no connection to ground terminal

mike49504 8th February 2011 04:29 AM

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

Perry Babin 8th February 2011 05:35 AM

1 Attachment(s)
What is the DC voltage on these two points?

mike49504 8th February 2011 06:03 AM

1 Attachment(s)
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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