Rockford fosgate power 1000 mosfet

[Perry Babin]

A good diode will read approximately 1/2v one way and open with the probes reversed on the terminals (out of the circuit).

#20:
It matters but I don't know if it's causing any of the problems you're currently having.

 

[chipper]

I don't want to give up. What else would you suggest checking?

 

[chipper]

I noticed when I touch the pins on 2N5401 audio comes back on.

 

[chipper]

I don't think it's the rectifiers they appear to test out fine I removed them from the board.

 

[Perry Babin]

If the 7918 has -47v, the 7818 should have +47v on pin 1.

With the two diodes back in the board, do you have +47v on the striped end?

Does the striped end read 0 ohms to pin 1 of the 7818?

 

[chipper]

I did a recheck on the voltage regulators on 7818 with negative probe on the tab of 7918 I get different voltages.

Pin 1: 54.62V
Pin 2: 47.39V
Pin 3: 53.07V

This is for 7818 regulator.

 

[chipper]

Were you referring to the last two near the 494C?

 

[Perry Babin]

I'm referring to the two with their striped end connected to pin 1 of the 7815. I have no clue which they are.

 

[secrets]

Did you ever repair this amplifier ? I have the same problem

 

[secrets]

input voltage 13.8v
45.9+

45.3-

op regulated shield pin 4 and 8 each is 14.5+and 15.1-
7918 #1
pin1 00.6v
pin2 -23.1v
pin3 -17.4v

7818 #2
pin1 25.5v
pin2 0.03v
pin3 18.2v
diodes 5.38 one way #2
5.93 one way #2
black probe on tab of 7818 test 7918
pin 1 0.00
pin 2 23.2v
pin 3 18.00v
diodes 17.5 v at stripe end on both

striped end read 0 ohms to pin 1 of the 7818

 

[secrets]

still lost but this amplifier has flux or rosin or maybe oxidtion on every soldered lead on ever part on the bottom of the board , is there anyway to clear that without scraping and plucking ,could that and maybe some cold old solder be the problem ?

 

[Perry Babin]

Please don't post in a repair thread unless you're trying to help the OP. Start a new thread if you need help.