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Mtx ta92001 distorted output.
Mtx ta92001 distorted output.
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Old 19th March 2019, 02:52 AM   #31
Perry Babin is offline Perry Babin  United States
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Do you have a 120v incandescent bulb (not LED or fluorescent) that you could connect across the speaker terminals? A dummy load would work but may draw excessive current, you'd have to be ready to quickly remove power/remote.
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Old 19th March 2019, 05:48 AM   #32
kfx5050 is offline kfx5050  United States
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Yes I do.
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Old 19th March 2019, 07:08 AM   #33
Perry Babin is offline Perry Babin  United States
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Connect whichever you have to the output terminals. When you power it up, doesn't it draw more current with the load than powering up without a load?

Check before and after LED400 lights up.
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Old 19th March 2019, 10:52 PM   #34
kfx5050 is offline kfx5050  United States
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Yes. with dummy load it pulled 23 amps powering on. without dummy load it only pulled 3.8 amps. Before LED 400 turns on there's no difference before or after with the amp drawn

Last edited by kfx5050; 19th March 2019 at 10:55 PM. Reason: More information
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Old 20th March 2019, 01:17 AM   #35
Perry Babin is offline Perry Babin  United States
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Remove R4111. Do you still have DC on the output?
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Old 20th March 2019, 03:49 AM   #36
kfx5050 is offline kfx5050  United States
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Yep still have dc on the output.
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Old 20th March 2019, 07:52 AM   #37
Perry Babin is offline Perry Babin  United States
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That should have disconnected all drive from the opto-couplers. You can confirm by measuring the DC voltage between the diode pins of the couplers. They should remain at 0v when the amp is on.

One of the opto-couplers may be leaking. You need to remove them AND install a jumper between pin 5 and 6/7 on each one. Don't apply power without the jumper. Do you still have significant DC?
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Old 21st March 2019, 12:58 AM   #38
kfx5050 is offline kfx5050  United States
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All opto-couplers show on pin 2&3 .243 volts but it fluctuates between .243 and 0 volts. I set my oscilloscope to diode function.3 of the 4 opto-couplers on pin 2 and 3 show 0L. One of the opto-couplers shows 0.005. I will be pulling the opto-couplers out that show 0L out now and jump pins 5 and 6/7
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Old 21st March 2019, 01:26 AM   #39
kfx5050 is offline kfx5050  United States
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I removed all four opto-couplers and jump 5 and 6/7 together still have dc 23 volts at the speaker terminal.
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Old 21st March 2019, 01:30 AM   #40
Perry Babin is offline Perry Babin  United States
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That would make it seem that you either have a leaky output.

All outputs should be at 0v (gate to source). Is that what you have on all outputs?
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