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JL Slash 500 v1 Help
JL Slash 500 v1 Help
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Old 4th December 2011, 01:50 PM   #21
Perry Babin is offline Perry Babin  United States
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Location: Louisiana
You need to remove all of the power supply and output transistors. You already know that you'll have to replace all of the gate resistors for the power supply FETs. You now need to check all of the resistors near the output transistors. Are any out of tolerance?
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Old 5th December 2011, 05:16 PM   #22
3025826 is offline 3025826
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Here's the readings multimeter set to auto OHMS
R502- reads 75 (marked 75RO)
R503- reads 243 (marked 241)
R504- reads 001 maybe bc it's part of a different circuit? (marked 471)
R505- no reading (marked 470)
R506- reads 047? (marked 470)
R507- reads 470 (marked 471)
R508- reads 241 (marked 241)
R509- reads 75 (marked 75RO)
R510- reads 1566 (marked 682)
R511- reads 221 (marked 2210)
R512- reads 221 (marked 2210)
R513- No read (marked 101)

R599- No read (marked 470)

A little confusing to understand some of these readings, but not a single one looks like it is bad. I checked the gate resistors that are clearly blown and all read very near 0 ohms

Last edited by 3025826; 5th December 2011 at 05:18 PM. Reason: Put R514 instead of R599
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Old 5th December 2011, 05:24 PM   #23
Perry Babin is offline Perry Babin  United States
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Quite a few look defective.

The last digit is the x10 multiplier for the ones without any letters. The other digits are the first numbers in the value.

If you haven't done so already, pull the output transistors. They could be skewing the readings.

The readings for the higher value resistors could be skewed by other components in the circuit. The one marked 682 (6.8k) is one example.

What do you mean by no reading? I'm assuming that the meter display didn't go blank.
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Old 5th December 2011, 10:09 PM   #24
3025826 is offline 3025826
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Ok I pulled all the transistors including D600. And by no reading I mean i tried all the OHM measurement including auto and nothing happens but a 1 displayed on the left of the screen

R500- reads 24
R501- reads 24
R502- reads 75 so its good
R503- reads 241 so its good
R504- reads 001 so its bad?
R505- only reads 5.34 at 20M OHM so its bad?
R506- reads 47 so its good
R507- reads 470 so its good
R508- reads 240 so its good
R509- reads 75 so its good
R510- reads 6.77 at 20k so I assume its good??
R511- reads 221 so its good
R512- reads 221 so its good
R513- reads 3.89 at 20M OHM so its bad?
R514- doesnt read (the 1 stays on the left of screen) even at 20M OHM so its bad?
R515- 10 so its good
R516- 100 so its good
R517- 10 so its good

Last edited by 3025826; 5th December 2011 at 10:16 PM.
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Old 6th December 2011, 12:16 AM   #25
Perry Babin is offline Perry Babin  United States
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If there's a question as to whether it's good when it's reading too low, desolder it and check it out of the circuit.

If it reads too high, it's almost certainly bad but checking it out of the circuit will tell you definitively.
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Old 6th December 2011, 02:46 AM   #26
3025826 is offline 3025826
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ok, what is a good way to desolder these things? I mean they are like tiny squares w solder on each end any technique? The transistors were easy
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Old 6th December 2011, 02:49 AM   #27
Perry Babin is offline Perry Babin  United States
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Add new solder to each end. Heat one end for about 2-3 second then move the iron quickly to the other side and slide the resistor off of the pads. If you simply slide it off of one pad to the other pad, it will hold it in place but will remove it from the circuit.
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Old 6th December 2011, 01:09 PM   #28
3025826 is offline 3025826
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Thanks that worked really well for removing them.
R504 turned out to be good when I took it out and checked it (so can I put it back in?)
R505, R513, and R14 didnt read andything but a 1 top left of screen even out of circuit
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Old 6th December 2011, 01:28 PM   #29
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
If it was reading low in the circuit and it reads the same when you reinstall it, you don't need to replace it.

If it was reading high in the circuit with a steady reading, I'd suggest that you replace it.

Since you have to order others and the cost is insignificant (less than a nickel), there's really no reason to reinstall the old one.

When you reinstall them, use desoldering braid to desolder both pads. Add new solder to one pad. Heat the solder and slide the new resistor into the solder. Hold it in place and remove the heat. Then solder the other end.

Don't use the braid from radio shack unless you use flux with it. If you use their paste flux, the braid will work reasonably well but you'll have to clean up the area with acetone and cotton swabs because the flux makes a mess. Use the flux sparingly. If you buy braid from the same place where you get the other parts, buy braid that has flux in it.
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Old 6th December 2011, 03:51 PM   #30
3025826 is offline 3025826
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Do you know of anywhere where I can buy everything? Online? And I dont what levels the gate resistors or can I order it all together?
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