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Old 24th February 2007, 06:25 AM   #1
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Post Rockford Fosgate series1460 sd

Hello,

I have a Rockford Fosgate series1460 sd 4 channel amp.

Would anyone by chance have a owners and/or Service manual for this one. I did some google searching and a search here. I did not find much info at all. I do know it will put out 30x4 @ 4 ohms.

I will be emailing Rockford Fosgate for info and I already sent ampguts pix as well. I will post here too.

Thanks for any info. Also, what is the best way to remove these pesky compression clips? Thanks...

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Old 24th February 2007, 09:52 AM   #2
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You don't see many series 1 amps. What are the symptoms that lead you to believe it's defective?

The clips are easy to remove. Get a screwdriver under the top of the clip and carefully pry up.

Look at the two preamp boards behind the RCAs. If there is any corrosion around the silver surface mount capacitors, the repair may be difficult. Many times, on the older punch amps, the caps leaked and caused the traces to be eaten away. The copper/fiberglass boards were easier to repair than the ceramic boards but can still be a challenge.
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Old 24th February 2007, 04:26 PM   #3
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Hi Perry, thanks for the reply.

In a few minutes I'll pry th clips off to get a look see. But the reason I think there is a problem is, when you look at the fuse it is melted a little. I did not see any corrosion on the preamp boards or any leaky caps.

Once I get the board out of the heat sink, Ill know what is going on and post a photo.

And no, you don't see many Series 1 amps. The last time I has seen one was 1994.

Thanks.
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Old 24th February 2007, 04:41 PM   #4
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Well I know one thing is for sure, There is nothing wrong that I can see on the bottom. There is a poor solder job on the fuse holder that I can fix later.

The caps don't look like there leaking at all. But I can not get a reading on my DMM from the output chips or 4 of the 6 power supply chips.

Ill post a photo of them later with part numbers. Right now I have to do some running around, but will be back later today.
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Old 24th February 2007, 10:01 PM   #5
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Default ROCKFORD

I believe there might be a upgrade service manual on this amp. Call Rockford and ask for tech help. You might be able to get schematics with updates.
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Old 24th February 2007, 10:15 PM   #6
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Hello,

I did email Rockford about this amp last night and have yet to here a reply. I will call them today and see if I get a response.

I finally removed the clips and pulled the board. I cleaned off all the thermal goop and started taking photo's. As of right now, I beleave it has been repaired before.

This is my first amp repair, so things will be interesting. I am sorry about the poor pics, but here is a new one.



Click the image to open in full size.

Any info and help would be great. Thanks.
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Old 24th February 2007, 11:55 PM   #7
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If there are no broken leads on any of the components that were mounted to the heatsink, measure the resistance between the legs of the individual power supply transistors (MTA30N06E). If you read anything near zero ohms between any of the three legs of a single transistor, it needs to be pulled and checked out of the board.

If there are no shorted transistors, apply power to the amp (it would be better to have the transistors clamped to the heatsink -- less chance of damage if some component begins to overheat). Set your meter to DC volts. Connect the black lead to the chassis ground terminal of the amp and measure the voltage on each leg of the PWM IC. It's likely a TL494. Look up the datasheet (Google) to see the pin configuration. Touch the red meter lead to each leg of the PWM IC and post the list of voltages for all legs.


Pin 1:
Pin 2:
Pin 3:
Pin...
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Old 25th February 2007, 12:52 AM   #8
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Thanks Perry.

I did a quick measurement and the outer legs of the transistors did not read anything at all. I will pull them as soon as a can, to get a reading.

As of right now my soldering iron died and I will not be able to get a new one for a few days, but will update if things change.

I will let you know. Oh, I could not see a TL494 but found a TL594CD. I think it is safe to assume that is it? There is a LM339d on the same card as well...
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Old 25th February 2007, 01:47 AM   #9
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You should have read 'something' when checking the transistors. Touch your meter leads together to make usre it goes to near zero ohms.

You need to check for shorts (zero ohm connections) between all of the legs of the transistors (all possible combinations), not just the outside legs.

The 594 is the same basic IC as the 494.

The 339 is a quad comparator and is used for over/under voltage shutdown, thermal shutdown and turn-on delay/muting.

If you're going to continue to do this type of work, do yourrself a favor and buy a good iron. A Weller WP35 would be a good inexpensive iron. A Weller WES51 is more expensive but is an excellent iron. Having a good quality iron makes the work much easier.
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Old 25th February 2007, 06:03 AM   #10
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Hi,

About the iron, It was my trusty 10yr old Ratshack. Not bad for were I got it...

Any way, After doing some more DMM testing, I found that the transistors would read when I set it on its 20K or 200K setting. All of them did. so I got a bug up my butt and pulled my battery out of my busted truck and benched it after I got a soldering gun from next door to fix the fuse holder.

I am pleased to say that 3 of the 4 channels do work. Unfortunately, ch 1 is really buzzy, crackly, and pops in & out at a very rapid pace. I took a close look at the preamp card and found some corrosion on one of the surface mount caps.

I've never messed with any SMD parts and quite frankly, I'm lost at this point. I can't seem to read the numbers on the parts either.

This is a lot better that it was doing when I got it, so I'm doing pretty good for now. Thanks for the assistance on figuring the readings.
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