AQ 2200

[brandes.cm]

email me if you want the schematic
brandes.cm@gmail.com

[brandes.cm]

Pin 1 of the KIA7500 is driven from IC2 pin 1 or 7 on the power supply pwm board.

D206 is the protect line from the output card, goes to pin 11 of the power supply pwm board. What voltage do you have on either side of D206?

If you lift D206 it may keep it from protecting, but use caution when doing this. Limit current and watch the current as you power it up.

[Deadly Sones]

Thank you brandes, I'm pretty sure Perry gave me a schematic a lil while ago. I'll have to find where I put it.

I have roughly 2.500 on the cathode side of D206 and it keep falling to 2.450 then jumps back to 2.5 and starts to fall again. I have 0.000v on the anode side.

I'll get more into this after work tonight

[Deadly Sones]

I have the following voltages on IC2 (IL393):
Pin 1: 6.62v
Pin 2: 2.473v
Pin 3: 2.53v
Pin 4: 0.000v
Pin 5: 1.025v
Pin 6: 3.23v
Pin 7: 0.116v
Pin 8: 12.67v

There is nothing on any pin of the LM293 (U1) on the output card. There is no voltage on any of the cards pins.

[Perry Babin]

Do you see a pulse of DC on the output filter inductors when you power the amp up?

[Deadly Sones]

Yes, I do... for just a split second, or one pulse yes. Then it reads 0.000. Both inductors have readings of just under .200v (using DMM) before it goes into protect. Which is almost instantaneously.

[Perry Babin]

Q7, 11, 19 and 22 commonly fail on these boards. Do you think that it's possible that one has failed and it's simply a coincidence that it failed when he was testing the speakers?

Why was he popping the speakers? Was he possibly already having trouble with the amplifier.

You stated that the amp was connected but didn't say that it was on so I'm assuming that it was not on. If that's true, the amplifier circuit would not have been connected to the speaker wires because the relay would not have been closed.

[Deadly Sones]

I guess anything is possibly when it comes to this stuff Perry. They pop speakers when you run 8ga speaker wire thats all the same color and have multiple coils and speakers to make sure they have the right speaker and proper polarity. Some vehicles are just a wad of wire ends to work with.

I'm not sure if radio (amp) was on or not. He just said it worked in the morning and didn't work after he was done wiring the subs.

I checked Q7, 11, 19 & 22 with my DMM. All pin configurations have high resistance and checking them on the board in diode check they appear fine. There is however no voltage on any pin with power applied (I assume cause of protect).

Can I lift D206 and see what happens? I do have a 50watt 2 ohm resistor to limit current. The amp is still in the case.

This amp is driving me nuts... , lol

[Deadly Sones]

Not sure if it means anything but I noticed as soon as I apply remote the protect light comes on. Then it turns off for a second and the power light flashes and then back to protect. It does this twice before the protect light stays on. So basically it tries 2 twice to turn on. dunno...

[Deadly Sones]

One thing I'm not understanding...

The output driver card only has like .003 - .005v on pins 1-1 to 1-7 & 3-1 to 3-7. On pin 2-1 I have 4.24v the same as the cathode on D206 (protection circuit). The other 7 pins 2-2 to 2-8 are 0.000v. Now is the voltage coming from pin 11 of the PS card? or is it going to it? I thought it was in "input" for the comparator on the PS card, so it would have to be outputted from the output card?

What drives the output card? The 12v regulated voltage that I don't have? how is this 4.2v being created? Looks like I have 12.7v up to R4A then after the zenner and diode I have 4.2 at point R29B. Then it goes into the comparator input.

One of the other comparator input is TH1. It has resistance, so I think its fine.

I'm lost...