Memphis 16-MCH1300 help

[Perry Babin]

Yes. Directly across the speaker terminals for each individual channel.

 

[scotts530]

With power and ground hooked up Left Rear channel read -105.3 mv Right Rear +105.3 mv Left Front -105.3 mv Right Front +105.3 mv. None of the channels made any difference when remote power was applied.

 

[Perry Babin]

Was this with the probes directly across the two terminals for each channel?

If so, did you watch the meter carefully for any change as remote voltage was applied and the amp went into protect?

 

[scotts530]

Yes I had the probes clamped in the set screws for each channel as I cycled the remote wire on and off. The meter made no change on any of the channels.

 

[Perry Babin]

Remove the four rectifiers for the sub channel and see if the amp still goes into protect.

 

[bigpun4fubu]

which are those?

 

[bigpun4fubu]

do i leave the outputs out as well?

 

[Perry Babin]

I'm assuming that post #46 and 47 were in the wrong thread?

 

[bigpun4fubu]

you mean the transistors? i just checked?

 

[Perry Babin]

This is the memphis amp repair, not the kenwood.

 

[scotts530]

Where are the four rectifiers for the sub channel Or do you know the printed numbers on the circuit board where they are located?

 

[Perry Babin]

D730, D731 and the next two rectifiers. I can't see the numbers in the photos.

 

[scotts530]

Were you referring to these?

 

[scotts530]

I don't see D730 or D731 anywhere

 

[Perry Babin]

They're clamped to the heatsink near the power supply FETs.

 

[scotts530]

I removed all four rectifiers amp still stays in protect mode. The funny thing about this amp is when i got it I hooked it up the protect light would come on first (red) then after a few seconds turn green which is what it is suppose to do but i had no output coming out of any of the speaker outputs thats when i decided to take the cover off to look inside you can see in those first pictures that i posted that this amp got smoked bad but it wasn't going into protect. Now after i replaced all the broke parts it's staying in protect mode.

 

[Perry Babin]

Other than the 4 rectifiers, what other parts are out of the amp?

List them all.

 

[scotts530]

All 8 IRF9640, 4 FB31N20D In the class d section. R34 SMD resistor on the power supply driver board is out of tolerance could that be the cause of it staying in protect?

 

[Perry Babin]

That could cause it to draw excessive current and if it has low voltage shutdown, that may be able to make it go into protect mode. What are you using to power the amp?

 

[scotts530]

I'm using a car battery with a battery charger hooked to it on 2 amp charge