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JL Audio 300/4 resistor values needed
JL Audio 300/4 resistor values needed
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Old 19th October 2017, 01:37 AM   #1
KevinMangini is offline KevinMangini  United States
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Default JL Audio 300/4 resistor values needed

Hi all,
I have a 300/4, board rev1 that's had a very poor repair job done. I have everything else squared away except these two resistors. Can anybody help me identify resistor values and/or part numbers for R536(top left) and R508(bottom right). Apparently the reapair facility was out of smd resistors that day. Both installed were 10 Ohm. I'm 99% sure R508 is a 10 Ohm, no clue on the other.

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Thanks!
Kevin
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Old 19th October 2017, 02:57 AM   #2
Perry Babin is offline Perry Babin  United States
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508 10 ohms

536 4.7 ohms
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Old 19th October 2017, 03:13 AM   #3
KevinMangini is offline KevinMangini  United States
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Thanks again Perry!
What size are these larger resistors? I ordered

CRM2010-JW-4R7ELF Bourns | Mouser

And

CRS2010-FX-10R0ELF Bourns | Mouser

For these this morning. Are these correct?
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Old 28th October 2017, 03:30 AM   #4
Perry Babin is offline Perry Babin  United States
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I didn't know the size. For others that may need this info, were the ones you ordered the right size?
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Old 29th October 2017, 12:40 AM   #5
KevinMangini is offline KevinMangini  United States
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Yes the above links were correct parts, size 2010 fits

I am still having distorted audio out of the right front channel though, after replacing power supply FET's with resistors and output FET's with resistors. I'm having trouble choosing a replacement for a 6.8V zener diode on the driver board (which likely went bad when my meter lead shorted pins 2&3 of the driver board)

How do I determine the zener current and reverse current for the replacement part? or do you happen to have a part number handy that will work here?
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Old 29th October 2017, 01:13 AM   #6
Perry Babin is offline Perry Babin  United States
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Maybe original?
http://www.codingintl.com/pdf/datasheet/Diodes/dzd.pdf

find something equal or better.
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Old 7th November 2017, 05:24 PM   #7
KevinMangini is offline KevinMangini  United States
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FIXED!

I replaced the zener diode labeled 6.8Y on the driver board with this part: BZX84B6V8LT1G.

BZX84B6V8LT1G ON Semiconductor | Mouser

I also removed all 4 driver boards and added solder, de-soldered and then re-soldered all surface mounted devices as Perry describes in other posts. During this process I found a 1K resistor on a separate channel that had separated at the end cap, which definitely saves me a future repair on this amp.
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Old 7th November 2017, 05:24 PM   #8
KevinMangini is offline KevinMangini  United States
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Thanks for all the help Perry! If it weren't for Basic Car Audio Electronics and your previous/current posts I would have definitely bricked this perfectly good amplifier. Please let me know the best way I can pay you for your knowledge, experience and time.
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