Rockford Fosgate Punch P1000-1bd

[rhempz01]

Rockford Punch 1000-1 that will not start up. just flashing in and out of protection.
im not reading anything real low on any output or power supply mosfet.
Drive looks good.
Amplifier just flashes into protection back out, draws 2Amps of current, over and over.

had an extra power supply driver card here its good, still the protection persists....

 

[Perry Babin]

Desolder the rectifiers and see what changes. Lifting the center terminal is good enough.

 

[rhempz01]

same result perry.

 

[Perry Babin]

Does the amp stay on if you power it up through a limiter?

Is it the red or yellow LED that's flashing on?

 

[rhempz01]

no difference, and its the yellow led.

 

[Perry Babin]

Does it do the same thing with only the remote and ground connected?

 

[rhempz01]

no, i can look at the drive that way

 

[Perry Babin]

The voltage on U101 is what I need. You'll need to make a right-angle probe and possible remove one of the primary filter caps to get to the pins if you want to avoid removing the driver board.

 

[rhempz01]

u101
1.) .053
2.) .086
3.) 11.98
4.) i touched this one q104 shorted.

 

[Perry Babin]

The probe likely shorted between pins 3 and 4.

 

[rhempz01]

1.) .053
2.) .086
3.) 11.98
4.) 1.589 / 2.678
5.) 1.415
6.) 2.478
7.) 1.725
8.) 4.063
9.) 2.271
10.) .485
11.) -.131 / 1.312
12.) .000
13.) -.021
14.) .582


measurements with the / are how it varies in and out of protection.

 

[Perry Babin]

Is this with b+ connected?

 

[rhempz01]

yes, did you just want the measurements with remote and ground only?

 

[Perry Babin]

It appears that that's the only way it's stable enough to get any usable readings.

 

[rhempz01]

1. 4.958
2. 6.272
3. 11.96
4. .074
5. 2.849
6. 2.479
7. 6.83
8. 4.065
9. 4.650
10. .461
11. 0.00
12. 0.00
13. .001
14. 5.493

 

[Perry Babin]

Are the two regulators (317/337) producing the right output voltage (B+ connected)?

 

[rhempz01]

they are all over the place as well so i changed them both. same result. the amplifier came on for a second once the lm317 was changed. Then quickly went back to in and out of protection.

 

[Perry Babin]

Are you getting about ±20v feeding the regulators?

Are the large resistors in front of the regulators within tolerance?

 

[rhempz01]

No. and if i test at main ground and the top of R9 the amplifier almost came on. ..

well someone has had the regulators off and did a bad job off cleaning up the pads and soldering them back down.

 

[Perry Babin]

Is the tab of any of the regulators shorted to the aluminum of the MEHSA insulator?