High voltages at J4
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High voltages at J4

by frank.f on Wed Apr 04, 2012 3:03 pm

Hi, i was lucky enough to get a xoxshop.de kit for my birthday and have begun building it up. Unfortunately I am having a problem at the power stage as my voltages at j4 are twice what they should be. They are 11.14 and 24. I have measured the voltages on each of the legs of ic23 and all the legs that should have voltage of 5.3 have a voltage of around 11.14. The voltages of the legs are as follows:

1 24.78
2 11.14
3 11.14
4 0
5 11.12
6 11.14
7 11.14
8 28.02

If anyone could shed any light on this or could sugest how i might go about rectifying the problem i would be really grateful.

Thanks
frank.f
 
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Re: High voltages at J4

by substyler on Wed Apr 04, 2012 3:18 pm

hi and welcome to this forum,

are you sure that your multimeter readings are right?
with that high voltages your 6562 on the IO must be hot as hell...

did you get your kit with a 9V AC power adapter? what kind of power supply you use?
you can also send me emails to my x0xsh0p email address.

cheers,
SubStyler
electronics consists to 80% of superstition and to 20% of fairy tales • DIY or die!

substyler
 
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Re: High voltages at J4

by frank.f on Wed Apr 04, 2012 3:33 pm

Hi, yeah im afraid they are. It didn't come with a supply so i am using a 500ma 9vac supply. My 6562 doesn't seem hot.

Thanks for your quick response and great kit by the way. Especially love the roland vintage faceplate.
frank.f
 
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Joined: Wed Apr 04, 2012 2:38 pm

Re: High voltages at J4

by guest on Wed Apr 04, 2012 3:51 pm

ic22 isnt working right
check that its the right part and in the correct orientation
and then make sure its solder joints are good
guest
 
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Re: High voltages at J4

by frank.f on Wed Apr 04, 2012 5:07 pm

I have double checked ic 22 and its correct and the joints are fine. Does this mean that ic 22 is faulty?
frank.f
 
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Joined: Wed Apr 04, 2012 2:38 pm

Re: High voltages at J4

by guest on Wed Apr 04, 2012 8:54 pm

if ic23 is socketed
remove it and remeasure the votlages at the socket

mesure the resistance from ic23 pin5
to ic22
one of the pins on ic22 should give 0ohms
either ic22 is bad
or its not making the right connections in the circuit
guest
 
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Re: High voltages at J4

by frank.f on Thu Apr 05, 2012 6:49 am

I havent removed ic 23 as it isn't socketed but if i really need to i can take it out pretty easily. I measured the resistance from the 5th leg of ic 23 to the middle leg of ic 22 and i get 0 ohms is that correct?
frank.f
 
Posts: 5
Joined: Wed Apr 04, 2012 2:38 pm

Re: High voltages at J4

by substyler on Thu Apr 05, 2012 1:06 pm

I'm still not sure that your readings are correct... did you switch your multimeter to measure DC voltages?
If I measure at J4 on my own I/O with AC function on my multimeter, I'll have exactly the same readings.

cheers,
electronics consists to 80% of superstition and to 20% of fairy tales • DIY or die!

substyler
 
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Joined: Tue Dec 02, 2008 5:29 pm
Location: Göttingen, Germany

Re: High voltages at J4

by guest on Thu Apr 05, 2012 3:52 pm

another test if you want to check ic22
is to short together the 2 pins on ic22
that do not go to ground

then check the voltages on j4
you should be able to adjust them with tm6
guest
 
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Re: High voltages at J4

by frank.f on Tue Apr 10, 2012 6:53 am

Hi, i have just tried this and i am able to adjust the voltage with tm6. Thanks for your help.
frank.f
 
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Joined: Wed Apr 04, 2012 2:38 pm