JL 250/1v2 always turned on - diyAudio
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Old 6th July 2012, 04:38 AM   #1
Zymian is offline Zymian  United States
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Default JL 250/1v2 always turned on

So, I just received this JL250/1v2 amp (used) and tried to place it into my current aftermarket system to power my sub (JL 8w7) only to find out that no matter whether I have a remote input connected or not to this amp stays on (green light, sounds good). Would be great if I wasn't worried about drain on my battery.

I have ran DMM tests on the amp and here are the results (all of these tests are done with the car engine off but electrical on):
Gnd to 12V: 12.5V
Gnd to Remote (no remote wire connected, 12V connected): 5.4V
Gnd to Remote (no remote wire connected, 12V disconnected): 0.02V

I currently have the car battery going to a 2 farad cap which then is distributed to the 2 amps (a JL 300/4 and the JL250/1v2). All power and ground wires are 4AWG and all 3 devices have separate grounds bolted into the frame. Any other thoughts before I give in to the fact that the 250/1 might be faulty?

Other things to note: I tried putting a remote wire on the amp, no difference however the remote wire is 18AWG and split between multiple devices (both amps and the capacitor). Thinking I need to put a relay in line for remote wire in the future.
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Old 6th July 2012, 05:19 AM   #2
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Is the 'signal switching' set to off?
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Old 6th July 2012, 05:52 AM   #3
Zymian is offline Zymian  United States
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Yes, signal switching was set to off for all those readings. Actually there was a voltage difference when it was on with no remote wire connected. The voltage ended up being roughly 10.4V from remote to gnd.
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Old 6th July 2012, 06:15 AM   #4
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With no signal source connected and no remote voltage, does the amp turn on?
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Old 6th July 2012, 01:05 PM   #5
Zymian is offline Zymian  United States
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Yes. The amp will turn on with no other wires but the 12V Batt wire and Grd wire. No signal source and no remote wire. Signal sensing turned off.
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Old 6th July 2012, 08:04 PM   #6
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If you apply only B+ and ground (no remote and no signal), will the amp go off after a few minutes?
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Old 6th July 2012, 09:09 PM   #7
Zymian is offline Zymian  United States
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Connected B+ and Gnd wires to amp (no remote and no signal). Left it plugged in for 20 minutes, no keys in ignition, steady 5.4V showing between Remote and Gnd even with no remote wire connected.
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Old 6th July 2012, 09:58 PM   #8
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Have you pulled the cover to see if you can see anything obvious?

On the preamp board, the 3 op-amps and switching power supply (tiny transformer) are part of the signal sense circuit. The right end of the preamp has the various control circuit components. Remove the board an look at the bottom of it to see if you see any green corrosion. If you do, don't wipe it or remove it yet.
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Old 6th July 2012, 10:40 PM   #9
Zymian is offline Zymian  United States
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Everything on the board looks in pretty good shape. I believe I've taken a shot of the 3 op amps u were talking about and the backside of the board where they are soldered into.

I'll try to get some shots of the entire front side and back side of the board. By the way Perry, thanks so much for your help.
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Old 6th July 2012, 10:46 PM   #10
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Does the amp have only one board?
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