At the very least, you need to replace:
Q2021
Q2025
Q2028
R2081
R2092
R2099
Desolder R2081, R2092 R2099 and check:
R2094
R2097
R2074
Remove Q2028 from the circuit, reinstall R2081 and R2092, clamp the transistors to the heatsink, insert a 15 amp fuse in the B+ line and power up the amp. Does it still have DC on the defective channel's speaker terminals?
If not, does the defective channel produce clean audio?
Q2021
Q2025
Q2028
R2081
R2092
R2099
Desolder R2081, R2092 R2099 and check:
R2094
R2097
R2074
Remove Q2028 from the circuit, reinstall R2081 and R2092, clamp the transistors to the heatsink, insert a 15 amp fuse in the B+ line and power up the amp. Does it still have DC on the defective channel's speaker terminals?
If not, does the defective channel produce clean audio?
Ok I just did as you asked and heres the results
R2094 - 10.0
R2097 - 39.0
R2074 - 10.0
Yes I do still have dc on the defective side after removing
the defective fet and resistor. It jumped around from neg to pos.
I'm going to test for audio now, but I have one quick question before I do. Are there l.e.d. lights on the board? Reason I'm asking is because I saw a red light flash and also a yellow light flash near were it says thermal on the board.
R2094 - 10.0
R2097 - 39.0
R2074 - 10.0
Yes I do still have dc on the defective side after removing
the defective fet and resistor. It jumped around from neg to pos.
I'm going to test for audio now, but I have one quick question before I do. Are there l.e.d. lights on the board? Reason I'm asking is because I saw a red light flash and also a yellow light flash near were it says thermal on the board.
Last edited:
Yes there is led's on the board. It should tell you on the board what the lights are I know the yellow is the thermal light the red one should be marked also next to the led.
that's a big relief, I thought so thing went wrong.
Do they stay lit or just flash for a quick second then go off?
flash for a sec
When measuring for dc on the output terminals. Only hook power ground and remote to the amp. Do not plug the RCA's into the amp.
Ok.
12mv is acceptable. Re-check it after you complete the repair and before you connect a speaker to it.
Read the following post if you haven't done so already.
http://www.diyaudio.com/forums/car-...-schematics-3.html?postid=1901581#post1901581
Read the following post if you haven't done so already.
http://www.diyaudio.com/forums/car-...-schematics-3.html?postid=1901581#post1901581
is anyone on this thread anymore? i need a bit of info. i have the same amp. my power mosfets are bad.top right corner of amp that is picturd on page 1. i can find 4 of the 6. the very last two i cant cross anywere. they are on the chip marked as CQ543 and CQ614. what can i put in there that will work? any guidence will be greatful. i really think these forems are educational to the fullest. THANKS GUYS!!!
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