[thestien]

hi i would like to know if anyone has a zoom50511 pedal as mine has burned out one of the resistors no. r15
and because its burned i cant see the colours on it i love the sounds from this pedal but cant use it anymore until i fix it.
so heres a plea to anyone who has a zoom50511 pedal plz open it up and tell me the colours on resistor r15 so i can get back to rocking out any help will be much appreciated

[solidwalnut]

Originally Posted by thestien

hi i would like to know if anyone has a zoom50511 pedal as mine has burned out one of the resistors no. r15
and because its burned i cant see the colours on it i love the sounds from this pedal but cant use it anymore until i fix it.
so heres a plea to anyone who has a zoom50511 pedal plz open it up and tell me the colours on resistor r15 so i can get back to rocking out any help will be much appreciated

Hi Thestien--

I don't know the zoom pedal, but I know electronics. If the resistor is burned, that's telling us that there's a shorted component in the pedal that caused a current surge and open that resistor. The resistor has acted like a fuse. Fuses are in place to be a sacrifice in the circuit should a failure happen. You can replace the resistor if you want, but be prepared for it to burn out again. You might take it to an electronic repair shop and have them check it out.

A thought I had is that sometimes this happens when you plug in a different power supply that has the wrong polarity. Is this possible?

Steve

[wjp01908]

Hi Thestien

22 Ohms 5% (red,red,black - gold)

Bear in mind what Steve said above and check the joints where the jacks are soldered to the pcb while you`ve got the back off. These break quite easily with repeated plug insertion / removal.

HTH

Will

[thestien]

hi thanks guys i really appreciate the help
ok i think i may have put to much current through the pedal as i have a multi adapter power supply and rarely check to see if the switches have been changed on the adapter.

and thank you for the info on which restistor i need ill go buy one tommorow ill let you know if this fixes the problem.

one more thing sorry to mope on but is there a way to test which resistor i need with a multimeter or any other such ways? incase i have a similar problem again?
thanks and thanks in advance.

(edit) ok thanks i checked the jack socket seems to be holding up for now but ill keep an eye on it thanks for the advice

[solidwalnut]

Originally Posted by thestien

....one more thing sorry to mope on but is there a way to test which resistor i need with a multimeter or any other such ways? incase i have a similar problem again? thanks and thanks in advance.

In the case of troubleshooting for an open resistor, google 'resistor color code' and you'll get the idea of what values you're looking at. Like Will says, your 22 ohm resistor is red, red, black with a gold band meaning 5% tolerance. The size will also be an indicator you'll need to know. The smaller ones (the body width) of 1/8th of an inch or so are often 1/8 watt, a quarter of an inch or thereabouts is often a 1/4W, 1/3rd of an inch is a half watt. It's ok to go larger in wattage if you have the room, but not smaller.

If you want to get an ohm meter, measure a known good resistor for practice as to what the color code says it is and what the value is supposed to be. As to measuring resistors that are in a circuit, if it's open (and be sure to check the range on the meter to make sure) it's often because of a surge and it gets burned, changing the colors! If nothing is wrong with the resistor, you'll most likely have luck reading the value.

When in doubt, it's always best to check the value according to the schematic or parts list.

Steve

[solidwalnut]

0=Black
1=Brown
2=Red
3=Orange
4=Yellow
5=Green
6=Blue
7=Violet
8=Gray
9=White

The first band to the left signifies the most significant digit, the second band indicates the least significant, the third band is the multiplier. The fourth band is the tolerance.

Ex. Red, Red, Black is 22 Ohms. Red, Red, Orange is 22k Ohms. Rather than a 'multiplier', what the band really means is, how many zeroes are behind the two digits?

The fourth band is tolerance: silver = 10%, gold = 5%

[wjp01908]

This is an easy way to check resistor values:

Graphical Resistance Calculator

Will

[solidwalnut]

Nice find, Will!

I should have known in would be on the 'net somewhere...

Steve

[SlickCat]

One more thing....you cannot measure the value of a resistor when its in the circuit. At least one end must be lifted first.