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Old 31st January 2013, 10:57 PM   #1
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Default Rockford Fosgate PA1-HD

Does anyone have any info on this unit??

The unit will not power on And when i opened it up there is a spot that looks like an 18 pin IC goes there but its missing..

So im assuming it is the power supply PWM chip

Or does anyone have high res pics of the board??

Any help would be appericated
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Old 1st February 2013, 12:28 AM   #2
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The only 18 pin PWM IC that I know of is an SG3526. Contact Rockford for the schematic diagram if no one can give a definitive answer.
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Old 1st February 2013, 12:29 AM   #3
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Have you tried Rockford's tech support, they seem to share schematics and bulletin boards with the public through their website.
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Old 1st February 2013, 01:04 AM   #4
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I contacted rockford and they gave me the only schematic they had on the unit..

Unless im over-looking it i dont see one on the schematic..

Heres a copy of what i got from them..
Attached Files
File Type: pdf PA-1_sch.pdf (192.2 KB, 41 views)
File Type: pdf pa-1hd.pdf (130.5 KB, 30 views)
File Type: pdf PA-1HD_rev-A.pdf (191.9 KB, 29 views)
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Old 1st February 2013, 01:26 AM   #5
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It doesn't use a driver IC. It has a self-oscillating supply.

This is the non-HD:
http://www.bcae1.com/temp/IMG_2405.JPG
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Old 1st February 2013, 09:18 AM   #6
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The unit i have here is nearly the same as the 1 in your pic..

The LM391 is missing on the unit i have here ..

The LM391 controls the LED'S


So should i put a LM391 in the unit i have here and see if thats what im missing or should i post a pic of the board?
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Old 1st February 2013, 01:28 PM   #7
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LM3915

I know nothing about these. The photos were taken when a friend brought it to the shop to work on it. If it's missing and the problem is that the LEDs are working properly, install one. It should have no other effects on the operation of the preamp.
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Old 1st February 2013, 03:37 PM   #8
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I will order a 3915 also do u happen to know a good part number or where I can get a new pot for this since the one that controls the fader is also missing from the pic it appears to be a 20 k pot
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Old 1st February 2013, 04:46 PM   #9
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I don't have a source. Check with Rockford. Maybe they have a few left.
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Old 1st February 2013, 08:18 PM   #10
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Would the missing fader control make it not power up?

I ask because i was tracing the circuit back and the fader control connects thru some diodes then it goes to the main power wire
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