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R type 2, quiet sound

Posted: November 6th, 2011, 11:14 am
by thomj
I've been loaned an original r type 2 pcb. The sound on it works but is quiet. The volume pot doesn't make it louder or quieter at all, but if you turn it all the way down it'll suddenly mute it.

I thought perhaps it may be a pot problem but there are some empty component spots, wanted to check nothing was missing :think:

Image

Anyone know if any of those spots should be filled?

Re: R type 2, quiet sound

Posted: November 6th, 2011, 11:52 am
by SuperDeadite
Don't know about R-Type 2, but my Kengo board (same pcb) looks identical to your R2. And the sound pot functions properly on mine.

Re: R type 2, quiet sound

Posted: November 6th, 2011, 12:16 pm
by thomj
I guess I should try and meter the pot then if thee don't look to be any missing bits. Thanks :)

Re: R type 2, quiet sound

Posted: November 6th, 2011, 8:27 pm
by VectorGlow
First check that the boardset is getting +12 volts DC, as well as -5 volts DC.

Then check the resistance of the pot - turn the boardset off, flip it over and crank the pot all one way - check the resistance. Crank it all the other way - check resistance again. I can't remember off the top of my head what resistance value the pot is - it will be a few K though.

If that's okay then I'd personally check the electrolytic caps (the green caps) and if they check out then check the sound going INTO the amp (this can be checked with an oscilloscope or a crystal earpiece).

Please report back here with your findings. :)

Re: R type 2, quiet sound

Posted: November 7th, 2011, 8:58 pm
by thomj
The volume pot's dodgy. Thanks for the help.

Deadite, could you please see what the value of your volume pot is? :)

Re: R type 2, quiet sound

Posted: November 8th, 2011, 12:48 pm
by SuperDeadite
Sure, if you can explain what you mean exactly.. :oops:

Re: R type 2, quiet sound

Posted: November 8th, 2011, 12:50 pm
by kernow
thomj wrote:The volume pot's dodgy. Thanks for the help.

Deadite, could you please see what the value of your volume pot is? :)

Only a couple of quid surely at most.

Re: R type 2, quiet sound

Posted: November 8th, 2011, 12:52 pm
by VectorGlow
He means the resistance value of the pot. :)

Afraid I don't have one here to check.

Re: R type 2, quiet sound

Posted: November 8th, 2011, 12:56 pm
by kernow
VectorGlow wrote:He means the resistance value of the pot. :)

Afraid I don't have one here to check.

*sarcasm flying over head sound*

Re: R type 2, quiet sound

Posted: November 8th, 2011, 1:11 pm
by VectorGlow
kernow wrote:
VectorGlow wrote:He means the resistance value of the pot. :)

Afraid I don't have one here to check.

*sarcasm flying over head sound*
No sarcasm intended or implied - just saying. Don't get offended. :D

Re: R type 2, quiet sound

Posted: November 8th, 2011, 1:18 pm
by kernow
:wtf:

:palm:

I was joking about the value of the pot :lol:

Re: R type 2, quiet sound

Posted: November 8th, 2011, 1:20 pm
by VectorGlow
Oh, doh is me! Sorry, rushing around like a blue-arsed fly here and the brain is working on low power. ;)

Re: R type 2, quiet sound

Posted: November 8th, 2011, 4:09 pm
by thomj
VG descried how to meter the pot earlier in the thread :) Use a multimeter set to resistance, k ohms
VectorGlow wrote: Then check the resistance of the pot - turn the boardset off, flip it over and crank the pot all one way - check the resistance. Crank it all the other way - check resistance again. I can't remember off the top of my head what resistance value the pot is - it will be a few K though.
If you can tell me the numbers you get I can buy a pot with the same values :)

Re: R type 2, quiet sound

Posted: November 9th, 2011, 4:35 pm
by SuperDeadite
Ah, sadly I currently lack a proper meter to do this with. Sorry... :?

Re: R type 2, quiet sound

Posted: November 9th, 2011, 4:45 pm
by thomj
OK man. I'll find someone else. But you really NEED to get a multimeter. Doesn't need to be fancy. Mine was only £4 or something.

Re: R type 2, quiet sound

Posted: November 9th, 2011, 4:51 pm
by kernow
You don't need a multimeter, if you've got this far don't let the trendy squad tell you what to do :problem:

Re: R type 2, quiet sound

Posted: November 10th, 2011, 6:25 am
by Jamtex
Kernow : I wonder if there is any voltage going across these wires *Sticks wires to tongue, wakes up 2 hours later* Yep that was definately mains voltage. :palm: :mrgreen: