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JL Slash 500 v1 Help
JL Slash 500 v1 Help
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Old 29th November 2011, 10:10 PM   #11
3025826 is offline 3025826
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How do I check the output transistors? I assume with a multimeteter
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Old 29th November 2011, 10:20 PM   #12
Perry Babin is offline Perry Babin  United States
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Yes. Set it to ohms. You should not read anything near 0 ohms between any of the legs of any individual transistor. Check all combinations (Leg 1 to leg 2, 1-3, 2-3).
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Old 2nd December 2011, 08:36 PM   #13
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Quite literally all of them read 0 ohms or .01 when touching the meter leads to the different legs of each individual transistor. Measured at 20M OHM. I assume that I measure these with the amp not connected to any power. Also want to clarify that the output transistors are the black things, some are bent, that connect to the heatsink with the white grease stuff. Confused me a little because near them it reads Q600-Q607 but there these tiny little things close too on the circuit board that have white lines in a square around them and under those squares reads R600-R607
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Old 2nd December 2011, 09:37 PM   #14
Perry Babin is offline Perry Babin  United States
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Set the meter to the lowest ohm/resistance range.

R... are resistors.

The output transistors are Q504-Q507.
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Old 3rd December 2011, 06:02 PM   #15
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I do think it is worth mentioning that the speaker wires came loose and touched right when the amp smoked which is what I believe caused all of this in the first place.

Ok it definitely takes patience to get a good read but here are the results... (at what is marked 200 OHM on my multimeter)
-Q607 reads 32.0 when touching the two outside legs, fluctuates 60-180 when touching the left and middle leg. But when touching on the right leg and middle leg I read 00.4 (When looking closely i see a hairline crack across the front
-Q606 is clearly blow part of the left leg not even connected
-Q605 reads 25.0 when touching the two outsides. the left and middle leg read 25.6. Again the right and middle read 00.4 (Has a small blemish w minute cracks looks like it could be blown)
-Q604 The two outsides read 27.0 the left and middle read 26.5 again the right and middle read 00.4 (there is a very small chunk missing in the middle)
-Q603 Left leg completely blown off just like Q606
-Q602 The outsides read 28.5 left and middle read 30.0 the right and middle read 00.4 (there is an almost imperceptible blemish on the front of this one too)
-Q601 The two outsides read 32.2 the left and middle read 32.6 and the right and middle read (you guessed it) 00.4 (this transistor is bent but is the best looking aesthetically)
-Q600 Is absolutely demolished
-D600 Is bent and reads 00.4 between outside legs im worried about it mainly because it is next to Q600 which is the most burnt.. but it looks good otherwise

If I had to say I would guess that every output transistor is blown, and I am worried about R600-R607 because they were close to where the transistors blew can I check these, could they be bad?
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Old 3rd December 2011, 07:25 PM   #16
Perry Babin is offline Perry Babin  United States
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Those aren't output transistors, they're power supply transistors. If one is defective, you'll have to replace all 8 of them.
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Old 3rd December 2011, 07:45 PM   #17
3025826 is offline 3025826
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Ok, Q504-Q507 they all look really great, slightly bent because I didnt do a good job taking off the covers.. But all the readings between any individual leg was between 0.04 and 1.3 with the exception of one 8.1 reading. I can post exact statistics if needed but does that mean they are bad too? They don't look burnt or blown..
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Old 3rd December 2011, 07:46 PM   #18
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I'm sorry I understand now that the you've already said I would need to replace the power supply transistors Q600-607, and the gate resistors which are R600-R607. So here is what I'm reading for the Output transistors Q504-Q507

-Q504 outsides 00.9 left and middle 00.3 right and middle 00.9
-Q505 outsides (no reading) left middle (no reading) right middle 6.2
-Q506 outsides 8.3 left middle 1.7 right middle 9.4
-Q507 No reads at all on any leg combos

Last edited by 3025826; 3rd December 2011 at 08:13 PM.
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Old 3rd December 2011, 08:37 PM   #19
Perry Babin is offline Perry Babin  United States
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You need to replace those also.

Do you have an oscilloscope?
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Old 4th December 2011, 06:43 AM   #20
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No I dont. Do i need one to diagnose more problems? I dont have a problem just ordering all of this and going for it, could you post me a link for the parts or know anywhere I can get? I can't seem to find them anywhere
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