Rocford punch 500-2 2007 model.

[rhempz01]

Will do thanks again.

 

[rhempz01]

I got the transistors I needed to today and installed them.
Q103 : 3906
Q104 : 3906
Q105 : 3904
Q106 : 3904
Same voltage no change the old were definitely burnt. Still same 4.64v on q1000 & q1090
And q1001 & q 1091 9.20v

 

[Perry Babin]

Confirm that you have a 0 ohm connection to ground from the collector of the PNP driver that has 9v.

 

[rhempz01]

No, open.

 

[rhempz01]

Pin 9 on the 494 reads 4.57v but pin 10 reads 11.57v.

 

[rhempz01]

I found it Perry all read 4.62 now one of the legs wasn't secured to the pad of the small drivers.

 

[rhempz01]

And all four collecters are 0ohms to ground. Looks good.

 

[rhempz01]

Perry resistant current causes only a yellow light not blue, is that normal for the under voltage?

 

[Perry Babin]

#27:
Only the PNP drivers should have a grounded collector.

#28:
I don't think that the LEDs are controlled by the low-voltage circuit. Have you checked the output transistors?

How low is the voltage?

What value limiting resistor?

 

[rhempz01]

Ok so the collector to ground as follows on pnp drivers:
Q103 0.00ohm
Q105 2.78k
Q106 2.78k
Q104. .3ohm

Output dc: ground and leg 1 of all outputs except q3005, q3090 are 17.4mv

The current resistor is 2ohm 100watts

 

[Perry Babin]

Did you change meter modes from measuring Q103 to 104?

DC offset is measured directly across the two speaker terminals for the channel being checked.

I was referring to B+ voltage since you asked about under-voltage.

 

[rhempz01]

So both q103-q104 are both .2ohms I just didn't wait long enough when testing.

Also I have 93mv on the rchannel and -23mv on lchannel

 

[Perry Babin]

The DC offset on the speaker output isn't significant since the power supply isn't operating (no B+).

 

[rhempz01]

Ok so where do I go from here? Since I have replaced the ps fets and drivers, checked all resistors. Outputs?

 

[rhempz01]

If I replaced all the ps fets and drivers, is it the ic 494? What is causing it to just be in protection?

 

[rhempz01]

So removed the shorted outputs and used the 2x2 good transistors and sodered them in the right channel, and now have cystal clear audio. Waiting for some parts.

 

[rhempz01]

So with the outputs installed in the right channel alone cystal clear audio from that channel. I installed the new transistors into the left channel and it now has flashing in and out audio.

 

[Perry Babin]

Did you reset the bias?

How much current is it drawing (bias pot fully counter-clockwise if you haven't already reset it)?

 

[rhempz01]

So the at the speaker terminal it's .946v then flashes to the -3??v and rght back up....I'm not sure what's going on twith it......what drives the outputs?

 

[Perry Babin]

You need to check all of the 2000 series parts between the outputs and the driver board in front of the outputs. If the problem is not there, it could be on the driver board.