Rockford Fosgate Punch 300x oldschool car audio 4 channel amplifier repair & short amp dyno
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- Опубликовано: 6 июл 2024
- In this video i received a Rockford Fosgate caraudio amp with a defective power supply.
The outputs checked ok thats why i thought that the fault was caused by a mistake during installation.
The oldschool car audio amp has the MEHSA Strips and with the small torch its a nice way to deal with it if you have to replace the components on them and you dont have a heat plate.
I replaced also the gate resistors and the resistor for the power led.
Repairing oldschool Punch amplifiers happens sometimes and i love it.
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Awesome video
Thank you ☺️
Wie cool ist denn bitte, bei der Reparatur dabei zu sein...
Man fiebert richtig mit..zumindest ging mir das so😬
This Rockford Amp will survive for a long time... really good job, dude!!!
Solche Videos kannst du gerne öfters machen...
Meine besten Grüße auch an David Stevens 🫡
Thanks 😊
Thanks for the cool video. I have a few 1995 punch amps that need repair, no burns on boards. I don't know what is wrong. Thank you for your informative videos.
Maybe mosfets?
MosFets, drivers - first check them properly to know if it’s worth fixing. In most cases it was worth it 👍
@audiokeller1do you have a video on how to check mosfets and drivers?, thank you buddy.
@jsnjcnt infinity think so , but it’s easy if you have an meter with diode check.
Check MosFets and drivers at power supply section and also drivers and mosfets in output section. Get a small power supply with current limiting and limit the current to around 3-5 Amps. Connect amp and check how many amps it pulls. Turn all bias pots full ccw and recheck 👍
Ok, awesome I have a Fluke multimeter. I think it has diode check. I need to get a variable power supply. Thank you for the help.
Very cool. Back in the 90s I was friends with a somewhat successful drug dealer who had a major car audio addict. Used to get all sorts of free stuuf from him because he was constantly upgrading and trying new stuff. GOt a couple of round 12" SoloBarics a Punch amp, and there was an MTX amp, forget the model, but it was a cheater amp and was designed by an engineer their hired away from Fostgate or maybe Kicker, used to really pound
Sounds like it was the MTX amp i really want to dyno - MTX thunder 2300 ? There is a nice video made by Dereck- oldschoolstereo.com
@@murrayshekelberg9754 the amp was to be the punch 300. But the designer went down the road to mtx and it bacame the ta2300..yup my friend john pleitz
@@audiokeller1975 I've been wanting to find a Thunder 2300! Great video btw, Loved seeing the repair process. I have a punch 100dsm that needs work.
@@jodyzung6455 what’s wrong with your 100DSM? Is it the older DSM or Punch 100 ix DSM ? The older ones feature additional boards with SMD devices on it. I had one of them repaired and it happens very often that the silver SMD capacitors leak out and create damage. They are 10uF 16V.
@@audiokeller1975 It's an original 100 DSM. I bought it used for cheap because the seller said one channel didn't work. That's all I know at the moment. I'll hook it up soon and see what happens. Hopefully I won't damage it further :)
I don't know if you're looking for advice or tips.
A couple things I would do different would be to use a little more soldier under the mosfets so that you can clearly see it come out all sides.
Second would be to use flux. The small amount of flux in your solder will quickly get burned away within a few seconds.
Third would be to heat the mesha a bit slower so that the heat can more evenly spread. In the video it looks like you heated one area very quickly.
Forth, be careful to not push down too firmly on those resistors. They are quite easy to snap in half.
Good job.
I've never really looked at this generation of amps. Internally it basically looks just like their older DSM and black and grind amps. Probably just a few small differences in the preamp. section.
All hints and tips are more than welcome 👍 I used multicore flux solder which I still own from the 90s 😄 to keep the video. Little shorter I made a cut , I heated the Mehsas slowly.
@@JasonWW2000 yes. Basically a dsm with xover .. and i agree..i never heat a part enought to melt solder on its tab..not directly. The part will be compromised..
I dont do it like that. I put flux on the back of the fet and heat the strip slowly until i see the solder flow then i push the part down and hold the part on top with pick tool making sure its tight against the strip then I slowly let cool
Great video! What is that electric box at 11:44 called and is idle current always done checking distortion or is that set by manufacturer for some amps ?
Thanks 😊
I think you mean my small power supply? With this thing I limit power consumption and check the idle current or do trouble shooting avoiding too much current flow if there’s still something defective. I don’t know how manufacturers set the bias. Sometimes Rockford set the bias a little high which is good for soundquality but generates more heat. Setting it lower just to the point where distortion disappears produces less heat. You can also set it without scoping the output signal but watching the idle current. Run the amp very hard after setting the bias and let it cool down if the amps bias isn’t drifting away all is fine 😀
@@audiokeller1975 awesome! Thanks