I got this amplifier for around $200 but theres a problem with this amp. There are very weird noise in the speaker after turning it on. After a minute the noise will go away but if i play a music the noise is present with the music, it sounds like clipping even at the lowest gain. The output side of the amp also gets very hot even at idle. Output fets and power fets seems ok. Also i got power drop from bench psu from 12v to 10v+ when connecting the amplifier even at idle. The positive rail voltage has very low voltage 16v while the negative has -33. Without the output fets in the board the gate on Q2009 and Q2007 has 8v and i think this is the problem. Other test i've done so far.
Q2010
11.88v
18.63v
11.33v
Q2012
11.91v
18.60v
11.37v
Q2001
6.81
18.53
6.26
Q2000
-6.81
-22
-6.28
U2000
0.62
3.11
0
3.11
4.73
10.39
4.72
7.19
U2002
0.62
0.42
0
0.42
0
10.42
0
7.19
Power Supply Fets
5.5v
11.35v
0
Rectifier diode
Black probe on middle leg first diode, Red probe on middle leg 2nd diode = 142volts (AC on meter).
Black probe on Ground, Red probe on middle leg of diode = From around 20v and keeps dropping..
My Batt possitive terminal has 10ampers fuse in line.
I replaced the 3 railcaps with 3300uf 100v. (Mouser has no 3900 on stock).
Tried replace the output 6.8 filter capacitor. No change.
I really appreciate any help on this amplifier. Got a fight with my partner after buying this amplifier and really need to get this fix.. TIA
Q2010
11.88v
18.63v
11.33v
Q2012
11.91v
18.60v
11.37v
Q2001
6.81
18.53
6.26
Q2000
-6.81
-22
-6.28
U2000
0.62
3.11
0
3.11
4.73
10.39
4.72
7.19
U2002
0.62
0.42
0
0.42
0
10.42
0
7.19
Power Supply Fets
5.5v
11.35v
0
Rectifier diode
Black probe on middle leg first diode, Red probe on middle leg 2nd diode = 142volts (AC on meter).
Black probe on Ground, Red probe on middle leg of diode = From around 20v and keeps dropping..
My Batt possitive terminal has 10ampers fuse in line.
I replaced the 3 railcaps with 3300uf 100v. (Mouser has no 3900 on stock).
Tried replace the output 6.8 filter capacitor. No change.
I really appreciate any help on this amplifier. Got a fight with my partner after buying this amplifier and really need to get this fix.. TIA
Yes I can still hear on subwoofer when I play sub only and low volume. I tested both on full range and subwoofer. In my car if i play loud with all the speaker on, I rarely hear the noise. Is this normal for rockford amps? Is it safe using this as is if I ignore the noise? I'm afraid I will do more damage more to the amp so I tried fixing it since I know a little bit of electronics.
I don't know how normal it is but class D amps can make all sorts of strange, low level noises.
I've seen some of the amps like this that would get hot at idle.
If you can power it up through a 10 amp fuse, it doesn't appear to be drawing excessive current.
Use a bit of adhesive to bind the tops of those rail caps together so they don't break loose from the board.
I've seen some of the amps like this that would get hot at idle.
If you can power it up through a 10 amp fuse, it doesn't appear to be drawing excessive current.
Use a bit of adhesive to bind the tops of those rail caps together so they don't break loose from the board.
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