Welcome to Laser Pointer Forums - discuss green laser pointers, blue laser pointers, and all types of lasers

LPF Donation via Stripe | LPF Donation - Other Methods

Links below open in new window

ArcticMyst Security by Avery

HELP ! Potentiometer Needed for Keyboard

wesdaman14

wesdaman14

0
Joined
Mar 2, 2008
Messages
1,500
Points
0
Hey Guys. I really need help from anyone that knows potentiometer's and stuff like that.
I have a Yamaha DX-100 Vintage Synthesizer and it has these " pitch " and modulation wheels" I was using the Modulation Wheel And all the sudden it would not move. This keyboard is well over 25years old so im guessing why it broke.
The pot it has i looked online and the website did not have it.
I called yamaha and they did not have the part anymore.
The potentiometer is manufactured by " Japan Alps " The number on the potentiometer says "618R 103B" all it has is 3 wires connected to the pot and all the pot does is go up and down its a rotary switch. is there any substitute i can use for thiss so i can still have teh same effect !! please help me !!


Picture021.jpg

Picture022.jpg

Picture023.jpg

Picture024.jpg
 





Flaminpyro

Flaminpyro

0
Joined
May 4, 2009
Messages
5,443
Points
113
not a problem, do you have a ohm meter ? if so measure across the outside terminals and find the resistance let me know and if I have that one I can send it to you, if I don't I know where to get them.

Peace All Pyro... :eg:
 
wesdaman14

wesdaman14

0
Joined
Mar 2, 2008
Messages
1,500
Points
0
Flaminpyro said:
not a problem, do you have a ohm meter ? if so measure across the outside terminals and find the resistance let me know and if I have that one I can send it to you, if I don't I know where to get them.

Peace All Pyro... :eg:
Click to expand...

OhmMeter ? like a multimeter ??? And that would be so kind of you if you would.
 
N

nikokapo

1
Joined
Dec 26, 2007
Messages
6,129
Points
0
Wes, get a Multimeter (they're cheap around there, 10 bucks) and measure resistance. If you don't know how to do it ask me and I'll teach you. If you don't want to buy one you can send it to me and I'll do it for you and send you a replacement. Of course it'll be a regular pot and you can just send it to someone in the US so as to spend less money. They're really cheap (3 dollars at the most).

Maybe you can go to radioshack and ask for help..
 
wesdaman14

wesdaman14

0
Joined
Mar 2, 2008
Messages
1,500
Points
0
Ok on my Multimeter set to the ohm setting the potentiometer Ranges from 11-13 ohms but then it stays steady at 12 ohm.

This is using the 2000k setting on my multimeter.
 
N

nikokapo

1
Joined
Dec 26, 2007
Messages
6,129
Points
0
Then it's 12kOhm. Get a 10kOhm or 12 (or 13,7). Not much more or less than that and replace it. If you don't know how to let me know.

EDIT: Remember that the knob has to be all the way left or right so you can measure the MAXimum resistance.
 
wesdaman14

wesdaman14

0
Joined
Mar 2, 2008
Messages
1,500
Points
0
oh shitt.. it wont even turn so i have no idea !! let me try the other pot which is the same but it twist's left and rightt
 
FireMyLaser

FireMyLaser

0
Joined
Jan 12, 2008
Messages
3,290
Points
83
No need to turn, measure between the two outer pins. But im pretty sure its 10k.

Edit your setting need to be 20K.
 
Last edited:
wesdaman14

wesdaman14

0
Joined
Mar 2, 2008
Messages
1,500
Points
0
FireMyLaser said:
No need to turn, measure between the two outer pins. But im pretty sure its 10k.

Edit your setting need to be 20K.
Click to expand...

ok it if if put the + and - leads on the outer pins, it dont get a reading, but when i put it on the inner 2 it does get a reading

these 2 it does get a reading

Picture022-1.jpg
 
N

nikokapo

1
Joined
Dec 26, 2007
Messages
6,129
Points
0
FireMyLaser said:
No need to turn, measure between the two outer pins. But im pretty sure its 10k.

Edit your setting need to be 20K.
Click to expand...

He won't get a reading on the outer pins. He has to turn it all the way and measure between left and center or right and center regarding which way he turned it. I don't recognize it but I agree with FML, I too think it's around 10k.
 
E

ElektroFreak

0
Joined
Nov 7, 2008
Messages
5,725
Points
0
You could probably find that very thing easily from digikey or mouser.. just download a catalog.
 
FireMyLaser

FireMyLaser

0
Joined
Jan 12, 2008
Messages
3,290
Points
83
The two outer pins has the highest resistance at all times. If you don't get a reading then the track has burned out, or your setting isn't on the 20k. Also it helps to desolder the pot from the wires so you don't get a miss-reading from the board.
 
diachi

diachi

0
Joined
Feb 22, 2008
Messages
9,700
Points
113
FireMyLaser said:
The two outer pins has the highest resistance at all times. If you don't get a reading then the track has burned out, or your setting isn't on the 20k. Also it helps to desolder the pot from the wires so you don't get a miss-reading from the board.
Click to expand...


Listen to this ladles and jelly spoons, he is correct. You DO NOT need to turn the knob to measure the resistance, you measure between the two outer pins, not the center pin ( wiper ) and one of the outer pins.
 
You must log in or register to reply here.




Top