Memphis MC1000D relay doesn't click

ComputerJLT · 22nd February 2012, 10:43 PM

the amp works, all the waveforms are good on the power supply and outputs, nothings burnt or caps blown. current is normal in idle and playing.

I even get audio; but i have to manually click the contactor in the output relay...

Where should i start looking? psu driver card? caps/resistors/transistors near the output relay?

I've already metered the pins on the relay coil and voltage doesn't change when the amp powers on. one odd thing to note is that the power/protect light bounce back and forth about 3x before the power light stays green.

timwebb · 22nd February 2012, 11:45 PM

u might have a slight short. there is a diode near the relay that engages it.

ComputerJLT · 22nd February 2012, 11:47 PM

slight short where?

timwebb · 23rd February 2012, 12:15 AM

i had one with the same issue it was the windings coming from transformer wire touching inside.

ComputerJLT · 23rd February 2012, 12:46 AM

c91 may have vented; tehres little fibers on the board near it but it still reads 25uf on my meter; i have another 22uf electrolytic i can use but its polarity is not labeled. can anyone tell me the value of c91

timwebb · 23rd February 2012, 08:02 AM

u got a picture?

Perry Babin · 23rd February 2012, 11:45 AM

Where is it on the board?

ComputerJLT · 24th February 2012, 01:29 AM

c91 is near the led's. id post a pic but the amps not near me. its near the big 12v filter caps and the big power supply torroidal trafo

ComputerJLT · 24th February 2012, 01:32 AM

i pulled the cap last night and tested it, it tested good out of circuit.

I'm starting to think the issue may have something to do with the two transistors that are connected to the muting relay. the 2 transistors look like they switch to ground when the amp comes up and goes out of protect; one was reading in circuit like it was bad but i didnt pull it to test out of circuit. i'll do that next. i dont have the location on the board of the 2transistors but they're connected to the relay and on the leg thats not connected to +12v battery input

22nd February 2012, 10:43 PM	#1
ComputerJLT diyAudio Member Join Date: Nov 2010 Location: South Texas	Memphis MC1000D relay doesn't click the amp works, all the waveforms are good on the power supply and outputs, nothings burnt or caps blown. current is normal in idle and playing. I even get audio; but i have to manually click the contactor in the output relay... Where should i start looking? psu driver card? caps/resistors/transistors near the output relay? I've already metered the pins on the relay coil and voltage doesn't change when the amp powers on. one odd thing to note is that the power/protect light bounce back and forth about 3x before the power light stays green.

23rd February 2012, 11:45 AM	#7
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Where is it on the board? __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

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22nd February 2012, 11:45 PM	#2
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	u might have a slight short. there is a diode near the relay that engages it.

22nd February 2012, 11:47 PM	#3
ComputerJLT diyAudio Member Join Date: Nov 2010 Location: South Texas	slight short where?

23rd February 2012, 12:15 AM	#4
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	i had one with the same issue it was the windings coming from transformer wire touching inside.

23rd February 2012, 12:46 AM	#5
ComputerJLT diyAudio Member Join Date: Nov 2010 Location: South Texas	c91 may have vented; tehres little fibers on the board near it but it still reads 25uf on my meter; i have another 22uf electrolytic i can use but its polarity is not labeled. can anyone tell me the value of c91

23rd February 2012, 08:02 AM	#6
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	u got a picture?

24th February 2012, 01:29 AM	#8
ComputerJLT diyAudio Member Join Date: Nov 2010 Location: South Texas	c91 is near the led's. id post a pic but the amps not near me. its near the big 12v filter caps and the big power supply torroidal trafo

24th February 2012, 01:32 AM	#9
ComputerJLT diyAudio Member Join Date: Nov 2010 Location: South Texas	i pulled the cap last night and tested it, it tested good out of circuit. I'm starting to think the issue may have something to do with the two transistors that are connected to the muting relay. the 2 transistors look like they switch to ground when the amp comes up and goes out of protect; one was reading in circuit like it was bad but i didnt pull it to test out of circuit. i'll do that next. i dont have the location on the board of the 2transistors but they're connected to the relay and on the leg thats not connected to +12v battery input