Autotek MM2000.1D no protection no relay - diyAudio
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Old 4th November 2013, 05:29 PM   #1
Randy62 is offline Randy62  United States
diyAudio Member
Join Date: Dec 2011
Location: Cincinnati area
Default Autotek MM2000.1D no protection no relay

Ive searched 13 pages under "relay" back to 03 and cant find anything on this problem.
This amp works fine.I have good audio to the relay but no click.Green LED is on Red protect LED is off.There is 14 volts on both sides of the relay.No ground.
I replaced the 3 transistors that control the relay circuit but it didnt solve the problem.Q51(A1381 connected to the relay)has 88volts on the center pin which doesnt seem right.It traces up to a circuit close to the class d driver board were there is a 5 volt Zener diode.There was no drop across it so I replaced it but still no drop.At this point Im not even sure if Im on the right track.
Does anyone know anything about the relay drive circuit on these amps?It is a basic Hifonics style with the 2 big output inductors,(4)blue rectangular caps,all TO 247 style mosfets throughout.
My first thought would be that one of the pins on ether one of vertical PS or drive boards would control the relay but since its not going into protect Im inclined to rule that out.But I could be wrong.
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Old 4th November 2013, 08:02 PM   #2
diyAudio Member
Join Date: Nov 2003
Location: Louisiana
email me.
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Old 5th November 2013, 02:28 AM   #3
Randy62 is offline Randy62  United States
diyAudio Member
Join Date: Dec 2011
Location: Cincinnati area
Thank you Perry.
It was slightly different then the one I have but it put me on the track.
Q5 that pulls the relay down to ground was open.That small little CLICK was music to my ears.
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