KICKER KX600.4

bdgf2004 · 25th January 2011, 10:48 PM

i got this amp the other day with 1 bad channel, the outputs (TIP35/35) were shorted between all 3 legs. i checked the drivers (TIP41/42) out of the circuit and they seem okay, the emitter resistors are within tolerance, and the base is getting 38v/-34v. i replaced the outputs and powered it up, now all 4 channels are kind of tappered down on the top half of the output. if i turn it up into clipping the top half will start distorting. i was just wandering if i should look further into this channel or something that all four channel have in common.

the pic is before clipping.

Perry Babin · 25th January 2011, 10:52 PM

Can you post a photo of the board?

bdgf2004 · 26th January 2011, 12:02 AM

pic

Perry Babin · 26th January 2011, 12:29 AM

Both +/- regulated voltage on all of the op-amps?

Clean signal coming off of the preamp board?

DC voltage on the base of Q149 and Q150? Place the black probe on the emitter of the transistor on which you're measuring the voltage (red probe on base). I'm assuming that this is like the 800.4. These transistors would be near the outputs and there would be a pair for each channel (249, 250...). The Qx50 transistors would likely be near large green film caps. Both should be C945s.

Dr Zeus · 26th January 2011, 12:52 PM

Does it clip like that with no load from a test speaker? Leave the RCAs connected providing signal and remove the test speaker/load. I've seen this on amps with failing driver circuitry where the signal looks OK without load, but with a test speaker attached the output will crumble.

bdgf2004 · 27th January 2011, 10:27 PM

well i got readings from all the Qx50's and they were all at 0.225v from e-b. then i got a phone call and when i came back the amp was off and now it wont come back on. pins 8 & 11 have 1.4v and pin 12 has 0v on the tl494. i never noticed any parts getting hot especially the power supply fets or the outputs. i was out of the room for about 1-2 minutes and now i regret it.

bdgf2004 · 27th January 2011, 10:30 PM

Quote:

Originally Posted by Dr Zeus

Does it clip like that with no load from a test speaker? Leave the RCAs connected providing signal and remove the test speaker/load. I've seen this on amps with failing driver circuitry where the signal looks OK without load, but with a test speaker attached the output will crumble.

that was with no load. i haven't even tried with a load yet.

bdgf2004 · 5th February 2011, 02:43 PM

if i removed the power supply rectifiers would that isolate the problem to either the power supply or the audio side of the amp. it was powering up fine but all the sudden it turned off and now i'm kind of lost. i know the TLx94 is not getting 12 volts but could it be something related to my previous problem (distorted output) which i believe is more probable or maybe something in the remote circiut?

Perry Babin · 5th February 2011, 03:13 PM

Is there a Q6? Possibly a 2SB649?

If so, post the voltage on all three legs.

bdgf2004 · 5th February 2011, 03:37 PM

with my black probe on ground i got:
E-13.98
C-1.443
B-1.442

25th January 2011, 10:52 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Can you post a photo of the board? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

26th January 2011, 12:29 AM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Both +/- regulated voltage on all of the op-amps? Clean signal coming off of the preamp board? DC voltage on the base of Q149 and Q150? Place the black probe on the emitter of the transistor on which you're measuring the voltage (red probe on base). I'm assuming that this is like the 800.4. These transistors would be near the outputs and there would be a pair for each channel (249, 250...). The Qx50 transistors would likely be near large green film caps. Both should be C945s. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

5th February 2011, 03:13 PM	#9
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Is there a Q6? Possibly a 2SB649? If so, post the voltage on all three legs. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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26th January 2011, 12:52 PM	#5
Dr Zeus diyAudio Member Join Date: Oct 2010	Does it clip like that with no load from a test speaker? Leave the RCAs connected providing signal and remove the test speaker/load. I've seen this on amps with failing driver circuitry where the signal looks OK without load, but with a test speaker attached the output will crumble.

27th January 2011, 10:27 PM	#6
bdgf2004 diyAudio Member Join Date: Oct 2010	well i got readings from all the Qx50's and they were all at 0.225v from e-b. then i got a phone call and when i came back the amp was off and now it wont come back on. pins 8 & 11 have 1.4v and pin 12 has 0v on the tl494. i never noticed any parts getting hot especially the power supply fets or the outputs. i was out of the room for about 1-2 minutes and now i regret it.

5th February 2011, 02:43 PM	#8
bdgf2004 diyAudio Member Join Date: Oct 2010	if i removed the power supply rectifiers would that isolate the problem to either the power supply or the audio side of the amp. it was powering up fine but all the sudden it turned off and now i'm kind of lost. i know the TLx94 is not getting 12 volts but could it be something related to my previous problem (distorted output) which i believe is more probable or maybe something in the remote circiut?

5th February 2011, 03:37 PM	#10
bdgf2004 diyAudio Member Join Date: Oct 2010	with my black probe on ground i got: E-13.98 C-1.443 B-1.442

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