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Old 2nd March 2010, 07:56 PM   #1
rafi77 is offline rafi77  United States
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Default Rockford Fosgate P10002

Hello everyone I'm new to this electronic repair, so I'm kinda lost on were I should begin testing the amp in order to fix it. The reasons I wanna repair the amp myself is 1) save money, and 2) I wanna learn how. Now the problem with my amp is one channel plays but the other does not play any audio, but it does send out a signal that causes my subs to smoke. When it stopped working I had the amp bridged playing clean and awesome. And when the channel blow it also fried the voice coils on my subs. For the life of me I can't figure why it blew, or what's wrong with it. I don't see any physical damage, soot (sp?), or melt downs. Any help will be greatly appresiated. Thank you
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Old 2nd March 2010, 08:49 PM   #2
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If you're new to amp repair, please read the basic amp repair page (link below).

Do you have a multimeter?
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Old 3rd March 2010, 06:19 AM   #3
rafi77 is offline rafi77  United States
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i have a multimeter (fluke), and i read the site and checked the transistors like it said, and they all failed two of the three test. because of this im kind of doubtful i did it right because one channel still plays and the amp doesn't go into protect mode or anything, but the test tells me their all defective. thank you for your help perry
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Old 3rd March 2010, 07:49 AM   #4
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Of the transistors marked 28N15 and 36P15, which ones read near 0 ohms when you place the probes on legs 2 and 3?
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Old 3rd March 2010, 03:05 PM   #5
rafi77 is offline rafi77  United States
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Q1028 - 36P15 - 2.26 (slowly decreases)
Q1022 - 36P15 - 2.421 (slowly decreases)
Q1025 - 36P15 - 1.575 (slowly decreases)
Q2028 - 28N15 - 00.2
Q2024 - 36P15 - 1.63 (slowly decreases)
Q2029 - 36P15 - 1.822 (slowly decreases)
Q2020 - 36P15 - 2.045 (slowly decreases)

There is only one 28N15 and the rest are 46N15. I tested them with the fluke set to ohm like the basic transistor testing says to.
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Old 3rd March 2010, 03:29 PM   #6
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Q2028 is defective
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Old 3rd March 2010, 03:45 PM   #7
rafi77 is offline rafi77  United States
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Should i also replace the resistor for that transistor?

Thank you
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Old 3rd March 2010, 03:47 PM   #8
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Yes. Q2028 is shorted but you should have three N-channel FETs and three P-channel FETs in each channel. What are the following transistors?

Q1026
Q1029
Q1031
Q2021
Q2025

Is the amp below the same as yours?
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File Type: jpg IMG_9368x.jpg (118.1 KB, 143 views)
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Old 3rd March 2010, 04:10 PM   #9
rafi77 is offline rafi77  United States
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Q1026 - 46N15
q1029 - 46N15
q1031 - 46N15
q2021 - 46N15
q2025 - 46N15

Yes my amp looks just like it, but at the bottom of the board underneath were it says Rockford Fosgate it says P1200.2 instead of P1000.2. Pics below

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Old 3rd March 2010, 04:36 PM   #10
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Perry,

Does that look strange? Q2028 a 28n15? and the rest 46n15's and 36n15's?

I dont think there should be a 28n15 in this amp.

Rafi has this amp been worked on before do you know??
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