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timwebb 16th September 2012 02:27 AM

memphis mr1.1200
im working on one of these amps and the issue is in the output section. ive traced it back to the ir2184s which looks to drive the output section. the amp is in protect when the output fets are in but they check ok.

timwebb 16th September 2012 05:04 AM

2 Attachment(s)

Perry Babin 16th September 2012 08:17 AM

Do you read anything near 0 ohms between pins 6, 7, 8 or pins 3,4, 5 of the 2184?

timwebb 17th September 2012 12:42 AM

i read nothing near 0 ohms. but its putting out a very bad signal

Perry Babin 18th September 2012 11:31 AM

Most amps that use this IC are self oscillating and won't have a drive signal with no output transistors in the circuit. If it's producing a drive signal, post photos of the waveforms on the gate pads for the output transistors.

timwebb 18th September 2012 11:57 PM

ok used the secondary tap for grounding point. i get a nice square wave. now i have an issue with the neg side of the outputs the amp power up fine without them and has a clean wave on the gate resistor but goes strait into protect when i put them in.

timwebb 19th September 2012 12:43 AM

the two output fets are connected to pin 4 of the ir2184.

timwebb 19th September 2012 05:42 PM

The don't need the get to osc.

timwebb 21st September 2012 02:18 AM

the ir2184s is to hot to touch. i read 51v at pin 5.

timwebb 23rd September 2012 08:42 PM

1 Attachment(s)
this is from pin 1 of the tl072c in the output circuit. volts/div5 time/div 5us

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