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Power Acoustik A3000db - DC on output while remote off
Power Acoustik A3000db - DC on output while remote off
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Old 21st September 2018, 01:04 PM   #11
imraneesa is offline imraneesa
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Originally Posted by Perry Babin View Post
The control voltage should be near positive rail voltage between remote applied and the end of the mute delay. At the end of the mute delay (red-green LED switch), the control voltage will go to very near ground. When remote voltage is removed, the control voltage will immediately go back (not climb slowly) to positive rail voltage.
voltage regulator is working very good. i was using current limit resistor so voltage regulator was not coming on. now it is working good. and the control voltage is also there on the driver board. i am still getting a pulse on dc when remote is removed. when the amp is on delay and when it comes on everything works great except when you remove the remote it gives dc pulse.

Last edited by imraneesa; 21st September 2018 at 01:32 PM.
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Old 21st September 2018, 01:34 PM   #12
Perry Babin is offline Perry Babin  United States
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Short the LED side of the opto-coupler used to switch the control voltage. Does the amp still pop?
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Old 21st September 2018, 02:15 PM   #13
imraneesa is offline imraneesa
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Short the LED side of the opto-coupler used to switch the control voltage. Does the amp still pop?
No it did not pop after shorting the led in optocoupler.
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Old 21st September 2018, 04:11 PM   #14
MarioRestucci is offline MarioRestucci  Italy
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Mr. Babin, I apologize for the intrusion, I wanted to recommend checking Q113 (typically KTA1023) on the driver board (if the optocoupler works well), it may be short causing the perpetual D-class operation even when the amplifier is turning off ( when the remote signal is disconnected), where instead it should stop, as soon as the remote signal is disconnected.
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Old 21st September 2018, 04:30 PM   #15
imraneesa is offline imraneesa
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Originally Posted by MarioRestucci View Post
Mr. Babin, I apologize for the intrusion, I wanted to recommend checking Q113 (typically KTA1023) on the driver board (if the optocoupler works well), it may be short causing the perpetual D-class operation even when the amplifier is turning off ( when the remote signal is disconnected), where instead it should stop, as soon as the remote signal is disconnected.
q113 is fine.
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Old 21st September 2018, 04:48 PM   #16
Perry Babin is offline Perry Babin  United States
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On the scope, the voltage on the control pin should go IMMEDIATELY back to near rail voltage. The way you described it, it seems that it's going back slowly. That is a problem.
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Old 21st September 2018, 05:31 PM   #17
imraneesa is offline imraneesa
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Originally Posted by Perry Babin View Post
On the scope, the voltage on the control pin should go IMMEDIATELY back to near rail voltage. The way you described it, it seems that it's going back slowly. That is a problem.
Do you have any schematic to trace why it delaying. or can you give me some idea what to look at.
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Old 22nd September 2018, 01:22 AM   #18
Perry Babin is offline Perry Babin  United States
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Desolder the opto switching the control voltage and lift terminal 5 and reinstall the opto. Power the amp up connect a speaker and signal source. Using a screwdriver (insulated handle), short pad 5 to pin/pad 6. Does it go quietly into and out of muting?
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Old 22nd September 2018, 01:10 PM   #19
imraneesa is offline imraneesa
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Originally Posted by Perry Babin View Post
Desolder the opto switching the control voltage and lift terminal 5 and reinstall the opto. Power the amp up connect a speaker and signal source. Using a screwdriver (insulated handle), short pad 5 to pin/pad 6. Does it go quietly into and out of muting?
yes it goes quietly into and out of muting. no problem.
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Old 22nd September 2018, 03:31 PM   #20
Perry Babin is offline Perry Babin  United States
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Solder pin 5 back to the board (on top is OK) and after the amp comes out of muting, short pins 3 and 4. Does it go in and out of muting quietly?
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