Kicker KX600.1

[caraudioguy2100]

This amp has the red board with the date of 2005.

Amp is stuck in protection mode all of the outputs test good .

TL494

Pin 1:0.00
Pin 2:4.96
Pin 3:0.05
Pin 4:0.00
Pin 5:1.47
Pin 6:3.65
Pin 7:0.00
Pin 8:0.61
Pin 9:0.03
Pin 10:0.04
Pin 11:0.63
Pin 12:13.65
Pin 13:4.96
Pin 14:4.96
Pin 15:4.96
Pin 16:0.00

 

[PapaZBill]

post pics of the board. One overall and two more splitting the board.

Lift R22-2K ohm. If that doesn't allow amp to power up, Lift R12-10K ohm.

 

[caraudioguy2100]

Here are some pics let me know if you need more

R22 in this amp is not a 2k

 

[PapaZBill]

Correction: lift R22-22K ohm

 

[caraudioguy2100]

Lifted R22 and R12 1 at a time amp still stuck in protection mode

 

[PapaZBill]

Check the resistance from power ground to Pins 8 & 11-U01-TL494. If shorted or low replace U01.

If not the soft start circuit has failed, Q71-C3876GR, Q72-MMBTA14, Q73-A1505GR and Q74-C3875GR.

 

[caraudioguy2100]

Anyone know of good replacements for the transistors listed in the previous post ?

I went to order them and only one that’s available is the MMBTA14

The rest I can’t find a good source for

 

[Perry Babin]

Did you lift/pull them and check them?

 

[caraudioguy2100]

I will pull them/lift them and check them off board .

They test fine on board .

 

[Perry Babin]

You need to check for leakage and open junctions.

 

[caraudioguy2100]

They all test fine off the board .

Set meter to ohms and they all read in the mega ohm range

 

[caraudioguy2100]

Anyone know of good replacements for the transistors in post 6 ?

I checked the ones in the amp they measure fine but amp is still stuck in protection mode and Papabill said to replace them .

 

[caraudioguy2100]

Bump

 

[PapaZBill]

caraudioguy, Check PM

 

[caraudioguy2100]

More messing with this amp .

Both power and protection leds are lit .

Here is what I bet on the 494

Pin 1:0.00
Pin 2:4.97
Pin 3:0.05
Pin 4:0.01
Pin 5:1.48
Pin 6:3.68
Pin 7:0.00
Pin 8:6.24
Pin 9:2.39
Pin 10:2.39
Pin 11:6.20
Pin 12:13.39
Pin 13:4.97
Pin 14:4.97
Pin 15:4.97
Pin 16:0.00

I get + - 12 volts on opamps

I get + - 57 of rail voltage

Amp has no audio relay doesn’t engage and both leds are lit

Any ideas ?

 

[caraudioguy2100]

Do the voltages appear correct in the previous post on the 494 ?

Anyone

 

[PapaZBill]

Sorry I've been dealing with water damage at my place and haven't been able to attend this. I will be in and out for a while. The answer to your Posts 15 and 16 is No. There should be ~12 volts at Pins 8 and 11, which in turn will allow 5-6 volts on Pins 9 & 10.

There is something not allowing the soft start circuit to ramp and latch.

 

[caraudioguy2100]

Thanks for the reply .

I will do some more checking and post back if I notice anything

Also sorry to hear about the water damage at your place

 

[PapaZBill]

Lift Q71. This may allow the soft start to ramp properly.

Also, check to see that C71 neg side has 5.1 volts DC.

Check D71,D72, D73-1N4148

 

[caraudioguy2100]

C71 has 5.26 volts on the negative side .

Lifted Q71 and it shuts the whole amp down voltage drops to 0.00 on pin 8,11

The diodes you said to check measure fine

Even replaced the 494 still no change