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Need schematic for cs800 but not s or x. Looks like the x one.
Need schematic for cs800 but not s or x. Looks like the x one.
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Old 6th February 2019, 05:22 PM   #11
indianajo is offline indianajo  United States
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There are six 1000 ohm resistors on the main heat sink to sense for the VI circuit. My PV-1.3k amp all of them were vaporized, hard to tell what they were. They are pin 6 & 8 if I traces the lines right.
There is a stack of temp sensor diodes per channel, between pins 3 & 13. The loopy one buried in the heatsink is the dual diode, cr103. Three regular diodes, probably near the driver transistors.
You are sliding the schematic page to the right to see the output board? Usually they are stacked vertically, but not on this eserviceinfo.com one.
BTW DON'T install the crowbar triac until everything has worked properly for several hours without the AC line resistor. You can blow several of them as you find more & more problems. Like I found some of those green cylinder caps were shorted or open, in the VI limiter. Also some of those little 0.1 uf tan caps sprinkled around the op amps.
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Old 6th February 2019, 10:32 PM   #12
Enzo is offline Enzo  United States
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The schematic shows which diodes are which type, the layout drawing shows where each is located. Should be no question.

Peavey does use flying rails on numerous models, but this is a CS800 which does not. The "output" bus goes through a relay to the speaker, and power supply commons are grounded.

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You are sliding the schematic page to the right to see the output board? Usually they are stacked vertically, but not on this eserviceinfo.com one.
Are you looking at the CS800X drawing set?
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Old 6th February 2019, 11:28 PM   #13
indianajo is offline indianajo  United States
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Yes, the one from eserviceinfo.com
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Old 7th February 2019, 12:37 AM   #14
Enzo is offline Enzo  United States
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OK I went and retrieved that file, the same one I have in my files.

I asked because you referred to the flying rails, which this amp does not have, and something about scrolling off to the side to see some board? I thought one of us must have a different file.
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Old 7th February 2019, 02:00 PM   #15
indianajo is offline indianajo  United States
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Well, the flying rails aren't obvious on any schematic, since the power supplies are shown if at all on a separate board, other side of a lot of spade terminals. Two sets of rectifiers would be a tipoff.
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Old 7th February 2019, 06:24 PM   #16
Enzo is offline Enzo  United States
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The clue is the output bus - the line from the output emitters. In flying rail it goes directly to ground. In conventional circuits it goes out to the load. Note the CS800X sends the output bus through a relay to the speaker.
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Old 8th February 2019, 05:32 AM   #17
kevin6878 is offline kevin6878  United States
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I cant tell which one of the diodes is the dual diode guys.My heatsink has six of those diodes looped down in the heatsink.The one i think is the duouble diode,well it looks the same as the others doesnt read shorted or have a voltage drop either way on diode test.That one part of this amp confuses me.Why doesnt the double diode look different?And theres not jus one diode loop on my heatsink there are six.But hey ill keep on truckin studying the schematic.
I have a new diotec bridge rec coming ,its shorted on the dc output side .No testing till i get that.I'll try to post a pic of the heatsink .Remember im jus doing this in my back garage,no claims to pretend im that experienced lol.But i learn lil by lil.
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Old 8th February 2019, 05:38 AM   #18
kevin6878 is offline kevin6878  United States
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heres a pic of the schem on mine .The xsistor numbers match and all that.It doesnt show a noted dual diode on my heatsink.I mean its a normal one direction diode symbol,why is that?
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Old 8th February 2019, 06:02 AM   #19
kevin6878 is offline kevin6878  United States
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Heres a better pic.I see the dual diode but cant pick it out on the board.Like someone said ,ill jus trace the pins out and follow i guess.I thank yall for listening.Its a challenge thats what is enjoying.And the mystery.
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Old 8th February 2019, 01:15 PM   #20
indianajo is offline indianajo  United States
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I've got a PV-4c output board out on the bench, and my double diodes are reading 1.502 v and 1.485 v forwards. The 1n4003 should read between .480 and .700 v forwards.
You've got two channels, doesn't the 13886 read correctly on even one of them? There are 4 diodes in the heat sense string at the bottom of the page, 3 of them are 1n4003 and one is the double. My CS800s is supposed to have a similar circuit but I'm not in the mood to take it apart just to look at this. Super experienced Enzo will know exactly, but he spends a lot of days away from the internet since he retired.
I expect one of the 1n4003 to be located near the drivers, which are the transistors with the base connected to pins 3 & 12. The double diode ought to be out in middle of the main output transistor area since that is where the real heat builds up.
When two double diode were blown in my PV-1.3k some kind person in illinois mailed me two that were from a scrapped unit. But nobody is talking here. Peavey sells them still. OTOH you could drill the heat sink a little bigger where the bad one is, glue in a red LED with heat sink glue, and shrink wrap the two leads around to solder in the board. Unfortunately heat sink glue is about $20 a tube.
You could alternately drill & tap a 4-40 or 3 mm screw hole, and screw on a transistor like a BD139 or MJE340 on a heat insulator pad. Then it takes two more resistors to get it to drop 1.48 v when cold as a Vbe multiplier. you've got to fiddle with a pot to get the exact value, then replace it with a fixed resistor. You can't leave a pot in permanently, the wipers oxidize eventually and make too much voltage drop which makes way too much idle current on the output transistors overheating them. To see the schematic of a vbe multiplier look at one of the NAP140 or 150 threads percolating on solid state now. The Vbe multiplier is between the bases of the driver transistors. Peavey's are suspected to produce crossover distortion occasionally cold at low wattage. A carefully adjusted diode stack or Vbe multiplier could solve that, but adjustment costs money in labor charges, so they didn't do it. Not important at 300 W/ch. To make them a hifi amp, fiddle with the diode stack until the crossover distortion at 1 W is gone. At least the later models with the 4580 "good" op amp.
Peavey didn't mark these double diodes with anything, which makes them a not ISO4001 compliant company. The insertion operator that put the special diodes in had a whole box of them, no confusion there.
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Last edited by indianajo; 8th February 2019 at 01:38 PM.
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