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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 17th February 2019, 08:13 PM   #51
kevin6878 is offline kevin6878  United States
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Quote:
Originally Posted by indianajo View Post
Yes, as I suspected. I asked you to check the LED which would show up as open too since they drop 1.6 v. But they burn green when you turn the power on.
My Craftsman 82144 DVM tries diodes at 2 v. Much more useful.
I cant find 82144 craftsman anywhere ,sure the # is right? i jus wantsd to chdck it out .
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Old 17th February 2019, 11:39 PM   #52
indianajo is offline indianajo  United States
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It's 15 years old. Sears is in bankrupcy. My newest $30 DVM is a house brand from Newark but I don't know the open circuit voltage on the ohms scale. Will check it Monday when I get to my volunteer job.
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Old 18th February 2019, 05:19 AM   #53
Enzo is offline Enzo  United States
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Sears is in bankruptcy, Craftsman is not. Craftsman tools used to be only at Sears, but now they are also sold at other stores, like Lowes and Ace Hardware. Sears sold the brand to get some cash.

I didn't look at them close, but I am sure they are something like Extech or similar, branded for Craftsman.

I would buy a 15 year old Fluke meter in a heartbeat.
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Old 18th February 2019, 09:10 PM   #54
indianajo is offline indianajo  United States
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Okay today at the worksite I checked my $30 on closeout Tenma 72-7725 DVM. It measured 1.71 v on a yellow LED on diode scale. So it is correct. Also discontinued. https://www.newark.com/tenma/72-7725...14_US%2Fsearch
However, I find Newark is usually pretty good at getting decent goods out of *****. Have their own QA department that doesn't miss much. Happy shopping.
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Old 18th February 2019, 11:55 PM   #55
kevin6878 is offline kevin6878  United States
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Thanks for the info on the meters
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Old 19th February 2019, 12:14 AM   #56
kevin6878 is offline kevin6878  United States
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yea your 7725 goes OL at 2.8v in diode test mode.
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Old 21st February 2019, 04:36 AM   #57
kevin6878 is offline kevin6878  United States
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still working on the cs800x amp.Now the j174 is shorted on one channel and the other has a shorted diode ,it blew two resistors and a ceramic cap.Right under the header pin connector.The flex cable header pin.Its one of the two big diodes on driver board.
The issues stated are on the driver boards .My outputs are good.Outputs arent shorted or getting hot.The 15v regs on the driver boards are good.
I dont know where to begin again lol.
Will the amp work with the j174 fets removed for now?
Thanks for any tips.
It may not can be fixed.Wish there was an abundance of driver boards out there.
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Old 21st February 2019, 12:20 PM   #58
indianajo is offline indianajo  United States
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When the J174 got blown on my PV-1.3k the transconductance amp U124 was blown too. This is the DDT circuit, I believe the unit will operate without both. J174 are hard to find, and there are two pinouts, the NatSemi one and the Phillips one, so check any units you buy to find out where the gate is.
My unit had 126 parts blown. Not expensive to replace, only the output transistors and rail caps were expensive. I got J174 for $.48 but last ones I bought were $2.30. I think the U100 will operate without both J174 & 8474, but not the DDT function.
It was time consuming to find all the blown parts. My theory was that the blown outputs let rail voltage come forward through the base line and blow up all the parts up forwards. It just took a while to find out what they were. I modified my PV-1.3k by replacing a jumper in the OT base line on the output board with 4 amp blade fuses, and clamping the OT base line to speaker ground on the driver board with 2.1 v 1W zeners. The zeners should blow the fuses if the output transistors blow again.
There was a whole working (allegedly) CS800x in my town for $125 last summer on craigslist. That didn't last long. They are somewhat obsolete in the stage band market because of the heavy transformer. For my home use, the transformer units are not a problem, would inhibit theft the next time somebody broke in here.
Diodes CR132, CR143, and CR104 are all right next to the header pins, so what else is likely to be blown has to do with which one is actually gone. These half amp diodes are about $.07 new and I actually used a bunch of used ones out of a dead PCAT ATX power supply. CR143 is next to Q105 the VI limiter transistor, which is a likely failure candidate in 150 v OT base line events. Not only the PV-1.3k VI limiter transistors all blown, but the sense resistors for the emitter resistors on the output board were all blown too. That unit had one of the .015 uf VI limiter capacitors blown open, too. Those are 50 v caps. It also had some 50 v .1 uf caps blown open around the blown driver op amp. In terms of parts one can leave out, VI limiters are high on my list.
I learned a lot about what the parts of the circuit were for by crawling around the board and replacing blown parts. It was a great tutorial in learning parts of the amp functions, but as an economic practice it would be faster to buy a new class T amp by mowing lawns or shoveling snow. Fixing blown amps is easier on the back, though, and can be done in rainy snowy February days in my comfortable living room. Just finished a PV-4c, lucky only the OT's were blown and the rail caps dried up. The DDT circuit is messed up, but with my TV tuner as sound source at 1W in my den, who needs it? I also changed the shutoff thermostat on the heat sink from 100C to 70 C. That unit had the OT's replaced 4 times previously; likely a design problem with the heat sink. I added more fins to the heat sink, this is diyaudio after all.
In terms of extreme diyaudio projects, one ought to be able to replace the driver board of a CS800x with a LM3886 chip amp board. Think about it.
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Last edited by indianajo; 21st February 2019 at 12:47 PM.
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Old 21st February 2019, 05:54 PM   #59
kevin6878 is offline kevin6878  United States
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im binning it for now or for parts.Now the other side has 80v dc on outputs .I want to keep my sanity and money for now lol.Has some good parts .
Oh well,i got it for free and learned alot.It has too many issues right now .
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Old 21st February 2019, 06:31 PM   #60
kevin6878 is offline kevin6878  United States
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Right now i cant spend the money .Id repace all outputs but to3 ones are quite expensive for 20 of them.Drivers included.I think i probably have a shorted driver causing the outputs to turn on full.Giving 80v dc on the output.
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