Question about JBL BP300.1 PowerValve Series Car Audio Amplifier

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Will an amp work without using the heatsink?

I have come across some amplifier boards I am cosidering using in an upcoming install I have planned. I am wondering if I will build heat too quickly without the heatsink? Seems to me it will recieve better airflow without a heatsink. Any info on this is appreciated. Thanx

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No, the heatsink helps dispell the heat.

Posted on Oct 05, 2009

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I have a Makita BMR100 radio. Stock speakers are 3.25" 8 ohm with an 8 watt 8 ohm amplifier. I replaced speakers with better 4" 4 ohm but they're not really compatible with an 8 ohm amp. I...


Buy an 8 ohm speaker and wire it in series-parallel look up images of of combination series-parallel wiring this allows wiring all speakers and keeping the 8 ohm loaf on the amplifier. Should get more linear volume between speakers. Not sure if replacement is worth it, those speakers are pretty good and work well with rain and jobsite conditions. I am planning to install some 8 ohm half inch tweeters on my Makita radio and using the series parallel wiring. Plead note series-parallel wiring is not series wiring or parallel wiring. It is s totally different way of wiring it that uses both names.

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25amps Fuzes burning out Everytime if when a new one in


Hi twintinktwo,
If your replacement fuse has an exact current ratings and yet immediately blew after an installation, this is an indication of shorted parts in the supply voltage line. Most likely it was caused by shorted output IC which is mounted in the heatsink. If your handy with electronics and have some necessary tools, pull-out this IC by deslodering it to the board and try the unit without this parts. If the fuse does not blew and finally the unit power up, you must replaced this IC and your unit will back to normal again.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.

May 27, 2011 | Coustic Car Audio 800S Car Audio Amplifier

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I have a faulty MOSFET amplifier amp-360, there is power supplied to it, ground and remote are fine as well as input and output signal, there is no sound at all, i have measured the values across the...


The power supply circuit could be defective. Unless you have a very expensive unit, it usually would cost more to have it repair then just purchase an used unit. If you are planning on fixing it yourself, chances are that you may not be able to find schematics or replacement parts for the unit.

May 23, 2011 | Lanzar VIBE 2CH 360W MOSFET AMP Car Audio...

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I have fender passport pd-250 the protect light on and the power light geos off


One or more of the power transistors are shorted. There are eight transistors in the amplifier section - 2 high & 2 low for each channel. This unit is difficult to open up to work on.

Unplug unit and check speakers with a multimeter to make sure they are not shorted.
Take off front panel (8 screws).
Remove power supply shield with yellow tape (2 screws).
Remove 2 screws holding top of power supply, loosen bottom screws.
Replace front and hold in place with a couple screws.
Turn unit around.
Remove screws holding heatsink (6 screws)
Open rear storage door.
Carefully pull amp section out, being careful of tightly routed wires. Note any connectors you disconnect.
The amplifier is the board on the top, the power supply is in the silver box.
Push the power supply forward and loose the black screws holding the amplifier board bracket closest to the heatsink.
Loosen the top brass screws holding bracket to heatsink and remove the bottom screws.
Remove all eight of the screws holding the transistor brackets & transistors to the heatsink. Look and take careful note of how the plastic insulators weave through the transistors. If you get this wrong, you can short out the whole amplifier when you turn it on.
Slide the amplifier board down and out where you can get to the bottom. Note the wires and connectors going to the small protect board over the amplifier.
Check the transistors with a multimeter to find the shorted ones. Remove and replace bad transistors. These are connected in pairs.
Reassemble in reverse. Be careful of reconnecting wires and insulators. Don't test until the amplifier PCB is back in place and you're sure of all wires. If the PCB is touching the power supply, you'll short it out.

Good luck, I told you this wouldn't be easy!

Mar 04, 2011 | Lectrosonics FENDER PD-250 PASSPORT SYSTEM...

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I have the passport p-250 i left it on over night and when you turn it on the red comes on that said protect thanks jimmy


One or more of the power transistors are shorted. There are eight transistors in the amplifier section - 2 high & 2 low for each channel. This unit is difficult to open up to work on.

Unplug unit and check speakers with a multimeter to make sure they are not shorted.
Take off front panel (8 screws).
Remove power supply shield with yellow tape (2 screws).
Remove 2 screws holding top of power supply, loosen bottom screws.
Replace front and hold in place with a couple screws.
Turn unit around.
Remove screws holding heatsink (6 screws)
Open rear storage door.
Carefully pull amp section out, being careful of tightly routed wires. Note any connectors you disconnect.
The amplifier is the board on the top, the power supply is in the silver box.
Push the power supply forward and loose the black screws holding the amplifier board bracket closest to the heatsink.
Loosen the top brass screws holding bracket to heatsink and remove the bottom screws.
Remove all eight of the screws holding the transistor brackets & transistors to the heatsink. Look and take careful note of how the plastic insulators weave through the transistors. If you get this wrong, you can short out the whole amplifier when you turn it on.
Slide the amplifier board down and out where you can get to the bottom. Note the wires and connectors going to the small protect board over the amplifier.
Check the transistors with a multimeter to find the shorted ones. Remove and replace bad transistors. These are connected in pairs.
Reassemble in reverse. Be careful of reconnecting wires and insulators. Don't test until the amplifier PCB is back in place and you're sure of all wires. If the PCB is touching the power supply, you'll short it out.

Good luck, I told you this wouldn't be easy!

Sep 08, 2010 | Lectrosonics FENDER PD-250 PASSPORT SYSTEM...

1 Answer

Marantz PM-74D


Your no doubt finding the speaker safety/turn on surge protect relay NOT engaging a few seconds after turning it on-right? Check the output transistors. These are the big green and black ones screwed to the heatsink. You gain access to them by taking off the bottom cover. There's 4 per channel--2 green and 2 black. You'll probably find one or more of them shorted. If you find replacements, put them in exactly as the originals with new thermal grease/heatsink compound. Unsolder and lift the center pin (collector) on each of the four transistors of the effected channel. Power it up and check across the outside pins of each device for proper bias-about a half a volt or so on each one. If the voltage is much higher, or not there you've got other problems that will require more diagnostic/troubleshooting. Do all the lights on the front panel work-or just the tape monitor indicators? If just the tape monitors light up, check resistors RN83 and RN84 on main board under the speaker connector board-remove the speaker connector board to get at them. These are bad on mine and I've yet to replace them. I believe these to be 920 ohm 1% precision resistors....

May 17, 2008 | Marantz PM-68 Amplifier

2 Answers

Amplifier repair


Unknown model not working could be a bunch of things!
does the unit have power?? fuse(s) ok?? turn on voltage present(12v)?? Any leds?? Unit ever get wet?? Any lites?? smoke get out?? was it, did it get real hot??
I have worked on a few with various problems, no common problems. Some of the things I have seen; Level adj pot was smashed in, Shorted fets , + burnt gate drive resistors in the ps section + blown runs, bad connections, shorted outputs, corrosion from beer leakage, bad electrolytic caps, leaking caps ate up the copper runs, metal bars used to hold down fets and outputs came loose, parts over heated and shorted.
Open up and look around, burnt resistors, leaking caps, puffed up caps, black marks, are all helpful signs.
These amps typically use FETs in the power supply(+/- 25-50v) and regular transistors for the outputs. Test all heatsinked parts for shorts. Carefully remove metal bars holding down heatsinked parts, keep track of where the heat sink insulators go, remove pcb and inspect runs. Repair and bench test with a power supply that has an amp meter. With out any input, unit should only use a few amps after initial 5-15amps to get the PS fired up. Then test across speaker outputs for any DC voltage. Anything over 1v, (should be very close to zero) amp needs some more work.
Good luck!

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It sounds to me like you may have burnt a trace off of the bottom of the circuit board inside the amplifier. If you know how take the amplifier apart and look carefully at the traces. To be clear the traces are the lines on the bottom of the circuit board not the component side. Look carefully they can sometimes be hard to spot. If you find one solder a jumper wire across the two points. If you take the amplifier apart take care in treatment of the output transisors along the sides.

Jan 17, 2007 | Kenwood KAC-9152D Car Audio Amplifier

1 Answer

Please help


Check to make sure you speaker has not shorted. Try a different speaker. If this is not the case you could have an internal shorted transistor inside of the amplifier. or in some cases both. If it is in the amp and you are comfortable working on the amp remove the cover and along the side connected to the heatsink. You will find the smps and the output transistors. use an ohmeter and check across the three legs one way you sould get one reading and if you flip the leads you will get another. if you encounter no resistance, no matter which way the leads are placed. That transistor will probaly need to be replaced. But check the speaker before you do anything. and the wires going to the speakers.

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