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Any body have board schematic for Rockford Fosgate 800a2?
Any body have board schematic for Rockford Fosgate 800a2?
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Old 8th November 2017, 06:59 AM   #11
rockfordfanatiq is offline rockfordfanatiq
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Join Date: Oct 2017
d6 and d7 seem to be fine assuming i was testing them correctly. Q4 I did however have a pnp in place of the npn that needs to be there so i will have to order some of those.
As for power supply mosfets,
Q15-452.1 k ohm
Q16-452.1 k ohm
Q17-452.1 k ohm
Q18-452.1 k ohm
Q33-.668 m ohm
Q34-.668 m ohm
Q35-.668 m ohm
Q36-.668 m ohm

Q12-650.6 ohm
Q30-244.0 ohm

Q14,Q13,Q31,Q32 I do not know how to test.

And yes, either Q3, or Q4 do heat up without b+ applied.
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Old 14th November 2017, 03:32 AM   #12
rockfordfanatiq is offline rockfordfanatiq
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Join Date: Oct 2017
After doing some looking on the schematic. I removed c18 capacitor to replace due to it having a white residue around the bottom of it. I have noticed the capacitor I removed is a 35v 10uF, but the schematic shows it being a 16v 10uF. I went ahead and ordered both but not really sure what I should replace it with. Should I put the 35v back in it or go with the 16v?
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Old 14th November 2017, 06:32 AM   #13
Perry Babin is offline Perry Babin  United States
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Location: Louisiana
35v
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Old 14th November 2017, 06:55 AM   #14
rockfordfanatiq is offline rockfordfanatiq
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Ok put 35v 10uF capacitors in, changed out the q4 with the correct npn transistor. Now upon powering it up q5,q6,q7,q8, are getting hot right away at power up. Also Q3 and Q4 transistors are also getting hot.Tried powering it with a 10amp fuse and it blowes it right away. Dont know what else to look at, at this point.
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Old 14th November 2017, 06:58 AM   #15
Perry Babin is offline Perry Babin  United States
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Location: Louisiana
Do not connect B+. Do you see a good drive signal at the gate of all of the power supply FETs?
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Old 14th November 2017, 07:05 AM   #16
rockfordfanatiq is offline rockfordfanatiq
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Q18-5.28v
q17-5.28v
Q16-5.28v
Q15-5.28 them are the ones getting hot
on the other side of the board
Q36-.231v
Q35-.231v
Q34-.231v
Q33-.231v
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Old 14th November 2017, 07:06 AM   #17
rockfordfanatiq is offline rockfordfanatiq
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q36-q33 do not get warm at all
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Old 14th November 2017, 07:07 AM   #18
Perry Babin is offline Perry Babin  United States
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Location: Louisiana
Replace the other 2 PS driver transistors.
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Old 14th November 2017, 07:08 AM   #19
rockfordfanatiq is offline rockfordfanatiq
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so that would be Q1 and Q2?
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Old 14th November 2017, 07:11 AM   #20
Perry Babin is offline Perry Babin  United States
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Location: Louisiana
yes
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