Rockford Fosgate Punch 600x4

[Bertje]

This Rockford Fosgate Punch 600x4 I have here came in with one defect channel.
Exchanged:
2x IRF 5210 and 2x IRF3415
R229 10 ohm
R228 20 ohm
2x 0,1 Ohm (drain/source resistors)
2x 0,05 Ohm current sense (R245/R234)

When starting up, the power supply is pulsing on/off/on like 5Hz., like it's in protection. No LED is on.
Checked the board, but cannot find any burnt or defective part, all output mosfets are ok.
I think there must be something wrong in the defective channel.

Without the rectifiers MUR1620's the power supply works normal, LM337/317 low power supply is ok.

Is there a schematic available or any ideas?
Board number 1325-57685-03 or 1405-57685-03

Thanks in advance.

 

[Perry Babin]

Did you set the bias pot fully counter-clockwise in the repaired channel?

 

[Bertje]

Thanks Perry for your quick reply and manual! I'll check with bias potm. CCW.

 

[Bertje]

This RF is working again, I did adjust the bias adjustment on all 4 channels. It's a bit trigger happy on starting up with my power supply with current limiter.

 

[Perry Babin]

It's a bit trigger happy?

 

[Bertje]

I mean that the protection of the RF comes in rather early at start up , when I use my power supply with current limit adjusted at about 4A.

 

[Perry Babin]

Current limiting can cause the low-voltage protection to be triggered.