Peavey IPR-1600DSP failed on one channel - looking for help in repairing it in the DR

Dec 16, 2018
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I am an expat living in the Dominican Republic. I am currently having problems with a Peavey ISP 1600 DSP unit where one channel went out and was looking to see if anyone had the schematic for it .. The technicians here are clever but limited in their ability to repair items like this. I am a retired electrical engineer, but not a Class D power am designer, so I was looking for any help possible. The problem is one channel does not function . On that channel the Blue Signal LED is lit. This failure happened while everything was hooked up for several weeks. I have tested the speakers and speaker chords and they are fine. I saw and printed the Peavey ISP 3000 DSP someone posted on this forum, but was specifically looking for the 1600 if anyone has it.
 
Dec 16, 2018
1
64
Understood. Here, anything I need I "import" from the states. And if possible, I repair things that go bad.
I suspect in this case it is just output transistors. I haven't opened it up yet because I have a gig this weekend and I can
still use it for one if its channels to power a subwoofer, but in the following week I will see if anything easy is possible.
Anyone know the part number they use for the output transistors?
 

steve149

Veni, Vidi, Lusi
Sep 26, 2011
31,587
Prospect, CT
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Dec 16, 2018
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Thanks Steve, True regarding the SMDs . Back in the day when I was an electronic design engineer, I got good at removing and replacing SMDs with just a soldering iron, but now the pitch of the IC's is much less. I will check out those larger transistors to see if they failed. Beyond that, it probably isn't worth it.
 

rickryan.com

DJ Extraordinaire
Dec 9, 2009
11,504
54
Hendersonville, TN
www.RickRyan.com
BTW, I didn't mean to sound like I was dissing your amp choice. I used a couple of IPR3000s for several years and loved them. I do think the 1600 is too small to power subs but that's just my opinion. The IPRs are an incredible bang for the buck. I had one fry when we were running it off a generator. I suspect low voltage killed it. It's almost un-real how much power you get out of something that feels like an empty aluminum box.
 
Dec 16, 2018
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No problem, rickryan.

The places to gig at around here are generally small and don't require a lot of power.

Class D amps in general are great for the lack of a need for that large transformer that makes other styles of amplifiers heavy.

I also have a non-functional CARVER amplifier. An old classic that worked for many years and is very hard to fix.
 

Valerie Hicks

Moderator
Staff member
I also have a non-functional CARVER amplifier. An old classic that worked for many years and is very hard to fix.
Which carver? We have a whole fleet of old-school Carvers and they are super serviceable--might be able to help you out on that one if you'd like to revive it. We only have one Peavey, an old CS800 we never use (inherited from my father in law and keep it around for a backup & rental).
 
Dec 16, 2018
1
64
Which carver? We have a whole fleet of old-school Carvers and they are super serviceable--might be able to help you out on that one if you'd like to revive it. We only have one Peavey, an old CS800 we never use (inherited from my father in law and keep it around for a backup & rental).
I have a Carver PM 1.5

Like this:

Carver PM-1.5 - Manual - Low Feedback / High Headroom Magnetic-Field Power Amplifier - HiFi Engine - (https://www.hifiengine.com/manual_library/carver/pm-15.shtml)

I had replaced one set of power supply caps, the higher voltage ones, using equivalents from Mouser a few years ago and then it failed in some other way.
An Ebayer has a replacement circuit board/cap set for the other lower voltage set of power supply caps, but I don't think the problem is with them.
 
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DJ TJ

DJ Extraordinaire
Oct 20, 2013
1,682
The old Peavey CS800 boat anchor was a very reliable workhorse in it's day. I guess it still is since Val still has one.:D
For the OP, if yours is a first generation IPR, they had issues and were quickly replaced with the IPR2 series.
As has been mentioned, not worth fixing but is the good channel the one used for bridge mode? If so, does it run properly as in outputting the proper wattage when bridged? If it does then the problem might not lie with the amplifier section.
 
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Dec 16, 2018
1
64
The old Peavey CS800 boat anchor was a very reliable workhorse in it's day. I guess it still is since Val still has one.:D
For the OP, if yours is a first generation IPR, they had issues and were quickly replaced with the IPR2 series.
As has been mentioned, not worth fixing but is the good channel the one used for bridge mode? If so, does it run properly as in outputting the proper wattage when bridged? If it does then the problem might not lie with the amplifier section.
Yes this is a first generation IPR 1600 DSP/ISP.

As far as I know , there is no bridge mode for the output of this amplifier.
There is a way to set the A input so that it feeds both the A and B inputs, but as far as I can see the amplifier sections are still separate.

I just made that switch from "Stereo" to "Mono" input mode and it did not appear to make a difference.
 

steve149

Veni, Vidi, Lusi
Sep 26, 2011
31,587
Prospect, CT

rickryan.com

DJ Extraordinaire
Dec 9, 2009
11,504
54
Hendersonville, TN
www.RickRyan.com
Mostly because it's not worth anything to get rid of. Even WE don't like to have to lug that thing around! We've used it 2 or 3x in the past 2 or 3 years ;-)
They used to use those CS800s to power stage monitors at the Grand Ole Opry. One night a rack of them got hung in the curtains and as the curtain went up, the rack of CS800s went up with it (I think it was 4). Not sure how high it got before it finally let loose but it fell on the guy mixing monitors. Luckily, it hit him in the shoulder. It would've killed him had it come down on top of him.
 
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Valerie Hicks

Moderator
Staff member
They used to use those CS800s to power stage monitors at the Grand Ole Opry. One night a rack of them got hung in the curtains and as the curtain went up, the rack of CS800s went up with it (I think it was 4). Not sure how high it got before it finally let loose but it fell on the guy mixing monitors. Luckily, it hit him in the shoulder. It would've killed him had it come down on top of him.
now that's a scarey proposition!! Holy smokes!! And one heck of a curtain too!
 

rickryan.com

DJ Extraordinaire
Dec 9, 2009
11,504
54
Hendersonville, TN
www.RickRyan.com
now that's a scarey proposition!! Holy smokes!! And one heck of a curtain too!
Yea, that's a huge stage and heavy, heavy curtains. I wasn't there when this happened but was on the next night. The amp rack was still over at the edge of the stage but had been moved away from the curtains. It still makes me shudder to think about 4 of those CS800 boat anchors coming down on top anyone.
 
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