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Old 29th November 2012, 01:36 AM   #1
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Default Bd1000 part numbers

Hey guys a buddy of mine wanted me to look at his bd1000 for him. right away I noticed there was continuity at the power and ground blocks. Took back cover off and noticed the center of the board overheated and the pwm "sg3526n" overheated also. There are 4 some components in te same area in q17 q19 q20 ad q21 does anyone know part numbers for these components? One of these components starts smoking when amp powers up. Thanks in advanced

Last edited by Rzabo2004; 29th November 2012 at 01:38 AM.
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Old 29th November 2012, 01:44 AM   #2
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Q17 and 19 are MPSA56s

20 and 21 are MPSA06s

If they are smoking, the power supply FETs and some of the power supply gate resistors have likely failed also.
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Old 29th November 2012, 01:55 AM   #3
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thank you
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Old 29th November 2012, 01:57 AM   #4
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do you think the fets are causing the continuity in the blocks or a failed pwm?
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Old 29th November 2012, 02:05 AM   #5
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'Continuity' can mean a lot of things. You can have continuity through a light bulb but it's not a direct short.

If the amp draws excessive current, it could be due to blown FETs.

Not all SG3526 ICs work without modifying the amp a bit. Don't replace unless you confirm that it's defective.
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Old 29th November 2012, 02:22 AM   #6
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What do you mean by not all sg3526 will work without modifying?
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Old 29th November 2012, 03:08 AM   #7
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Every BD1000 I have repaired with a faulty SG3526, when that IC is replaced the amp will not power up, wont do anything. Never have figured out why.

You have to change the 0 ohm resistor to a 1K resistor which is located in the R34 location on the board.

Its very strange but I dont know why, maybe Rockford used a 1 of a kind IC or something wierd!!!
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Old 29th November 2012, 03:54 AM   #8
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Quote:
Originally Posted by seankane View Post
Every BD1000 I have repaired with a faulty SG3526, when that IC is replaced the amp will not power up, wont do anything. Never have figured out why.

You have to change the 0 ohm resistor to a 1K resistor which is located in the R34 location on the board.

Its very strange but I dont know why, maybe Rockford used a 1 of a kind IC or something wierd!!!
Replace sg3526 and replace the 0 ohm resistor for a 1k and then it will work?
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Old 29th November 2012, 04:33 AM   #9
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Im not saying that is your only problem.......You probably have blown output fets or power supply fets. The fets, gate resistors, and drivers will have to be repaired before anything.

After they are repaired or confirmed not defective then you can work on the SG3526 if its repair, they rarely fail.....can you post a pic of the board?

Have you metered the output fets?

Have you metered the power supply fets?

If the components you stated earlier in your post are burned most likely the power supply fets and gate resistors need to be replaced along with the drivers.

Next step would be to determine what took out the power supply, wether it be reversed polarity or shorted output fets.
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Old 4th December 2012, 01:55 AM   #10
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Does anyone have a replacement part number for the four rectifiers on a bd1000. I can't not find a replacement for them. Stpr15

Last edited by Rzabo2004; 4th December 2012 at 02:04 AM.
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