Think I blew up my Series II Model 700.

C

ChopperCharles

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Cranked the music tonight, and my left speaker started smoking out of the rear port. Before I could get to the amp and turn the volume down, it was gone. Hooked up a different speaker, and the left channel of my PL now has only treble. No bass to speak of. What did I do, and how hard/expensive is it to fix?

Charles.
 
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ChopperCharles said:
Cranked the music tonight, and my left speaker started smoking out of the rear port. Before I could get to the amp and turn the volume down, it was gone. Hooked up a different speaker, and the left channel of my PL now has only treble. No bass to speak of. What did I do, and how hard/expensive is it to fix?

Charles.
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Oh shit!! I hope it's no big deal. I'm no tech
 
NavLinear

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ChopperCharles said:
Cranked the music tonight, and my left speaker started smoking out of the rear port. Before I could get to the amp and turn the volume down, it was gone. Hooked up a different speaker, and the left channel of my PL now has only treble. No bass to speak of. What did I do, and how hard/expensive is it to fix?

Charles.
Click to expand...
Hey Charles,

Several failures could have caused this but most suspect would be a DC component on the output. I know you've asked before but is this something you would want to upgrade to eliminate problems like this?

If you have a meter you would want to start on measuring what the output is doing. Make sure you remove the speakers so you don't F another one up. If DC is present at anything above a very low level this could be the issue. Some photos and measurements would help get us pointed in the right direction.

Sorry to hear about your problem - we should be able to help you solve this.
 
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ChopperCharles

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ChopperCharles said:
Cranked the music tonight, and my left speaker started smoking out of the rear port. Before I could get to the amp and turn the volume down, it was gone. Hooked up a different speaker, and the left channel of my PL now has only treble. No bass to speak of. What did I do, and how hard/expensive is it to fix?

Charles.
Click to expand...
Okay, I'm retarded. The speaker I hooked up? I forgot to plug the woofer back in after refoaming it. Amp appears to be fine.

Checked the DC offset, and I'm at .01 volts (10mv) on both channels.

Charles.
 
NavLinear

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ChopperCharles said:
Okay, I'm retarded. The speaker I hooked up? I forgot to plug the woofer back in after refoaming it. Amp appears to be fine.

Checked the DC offset, and I'm at .01 volts (10mv) on both channels.

Charles.
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Ok - so the left speaker you mentioned is damaged?
 
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ChopperCharles

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No, didn't blow my amp, it didn't go into DC mode, I just over-drove the speaker. The speaker is junk, both 6.5" driver voice coils are melted.

I have been able to find zero information on modifications to the series II model 700, so there is no protection installed.

Charles.
 
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ChopperCharles said:
No, didn't blow my amp, it didn't go into DC mode, I just over-drove the speaker. The speaker is junk, both 6.5" driver voice coils are melted.

I have been able to find zero information on modifications to the series II model 700, so there is no protection installed.

Charles.
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Lee can change all that for you Charles :)
 
NavLinear

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ChopperCharles said:
No, didn't blow my amp, it didn't go into DC mode, I just over-drove the speaker. The speaker is junk, both 6.5" driver voice coils are melted.

I have been able to find zero information on modifications to the series II model 700, so there is no protection installed.

Charles.
Click to expand...
Now I understand - a bit slow on the uptake. You're looking for a PL 700 Series II upgrade thread I'm guessing. I don't think one has been documented at this site but there are others that can confirm or deny this. I believe most of the topology is the same between series although the original 700 has a slightly different back wall configuration making the upgrade to the backplane boards a no go. If you read a 700B upgrade thread that should be very close to what a Series II will require without a light board though.

Lee has mentioned in previous conversations that he will be upgrading a Series II 700 and hopefully a 400 Series II. That will be a great help for those with those models. More light will be shed here so stick around.
 
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NavLinear said:
Now I understand - a bit slow on the uptake. You're looking for a PL 700 Series II upgrade thread I'm guessing. I don't think one has been documented at this site but there are others that can confirm or deny this. I believe most of the topology is the same between series although the original 700 has a slightly different back wall configuration making the upgrade to the backplane boards a no go. If you read a 700B upgrade thread that should be very close to what a Series II will require without a light board though.

Lee has mentioned in previous conversations that he will be upgrading a Series II 700 and hopefully a 400 Series II. That will be a great help for those with those models. More light will be shed here so stick around.
Click to expand...
The 700B and Series 2 are nearly identical where it counts (chassis and back wall) except for cosmetics and meters. Same is true of 8 fin PL400 Series 1 and Series 2.
 
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Northwinds said:
It's a shame that is was only offered as an option. A couple bucks in parts and there would have never been the "flame linear" legacy
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No I don't think so Ron. If the amps failed they would still have that legacy despite a DCP. The root cause problem was that they failed.

This amp did not fail here, it just zorched a speaker. In this case, the DCP should have done nothing and let that happen.
 
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ChopperCharles said:
No, didn't blow my amp, it didn't go into DC mode, I just over-drove the speaker. The speaker is junk, both 6.5" driver voice coils are melted.

I have been able to find zero information on modifications to the series II model 700, so there is no protection installed.

Charles.
Click to expand...
Bump
 
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