Paging Perry, if you are around, one issue with PPI Promos 425

Nagamitsu · 11th July 2011, 06:32 PM

Thanks Perry! Remember this that I posted:

Help, can't figure out what resistors these are

Ok, my deck issues taken care of, hooked everything up, I don't have sound through the rear output of the amp. I do have sound through the front output (that's where the resistors were worse off, compared to the rear side of the circuit board).

One big difference here, and wondering if this could be the cause. The two capacitors in-line with the resistors on the front output, I changed those out. I did not change them out on the rear output, near the two heated up rear output resistors.

Does this sound like a good possibility for the cause of no rear output? I am going to replace them just in case, just wanted your thoughts.

Thanks in advance,

Tim

Nagamitsu · 11th July 2011, 07:35 PM

Ok, my mistake, thinking it could be the amp. One last thing to try. I tried speakers on both front and rear output, and I appear to have sound. Tried switching around RCAs too, just to make sure no problem on that end of things and seems fine.

That leaves it down to my deck which just got back from having its outputs replaced/repaired by Kenwood warranty depot. I'll try hooking up the RCAs to the rear output on deck, currently they are on front output.

Tim

Nagamitsu · 11th July 2011, 08:07 PM

RCAs on rear out of deck, same symptom.

Symptom: No sound on right/passenger side

Setup:

PPI Promos 425 (4 channel), single RCA from front output on deck going to amp, split with a Y connector, plugged into all four amp RCA jacks.

Front output of amp sending signal to driver/left side of car (crossover/components), where I have sound.

Rear output of amp sending signal to passenger/right side of car (crossover/components), no sound.

I think I have ruled out the amp. If I plug in RCA to rear RCAs on amp, and plug the driver speaker wires to the rear output of amp, I have sound in driver side. Same goes if I plug RCA into the front RCAs on amp, and driver side speakers to front output of amp.

So issue maybe, somehow with my passenger side crossover, speakers, speaker wire I would think at this point. Ugh.

Tim

Perry Babin · 11th July 2011, 08:10 PM

Confirm that the RCA shields for the rear channels read 0 ohms to the case of the head unit (no RCAs plugged in).

Nagamitsu · 08:37 PM

Quote:

Originally Posted by Perry Babin

Confirm that the RCA shields for the rear channels read 0 ohms to the case of the head unit (no RCAs plugged in).

Thanks! I unhooked the RCAs from the amp and the head unit, Ohm meter set at 200, I get a read of 24-26 from one shield end of RCA to the other end, on both left/right of the RCA cable. Unless I've mis-interpreted what you were asking me to do.

Was my thought the RCA cable itself may be fine, as it plugged into either front/rear of amp, I was getting clear signal/sound to the speakers.

Realized now, all RCAs unhooked, one lead of Ohm meter on head unit case, other lead to RCA shields on the amp or head unit, or RCA cable end itself?

Tim

Perry Babin · 11th July 2011, 08:41 PM

RCA Shield Repair

Nagamitsu · 11th July 2011, 08:48 PM

Understood now. So your thoughts (which would mean the Kenwood warranty depot didn't fix it fully) are that the shield ground might be open. The result I "want" to see, to confirm head unit is ok, is a less than 1ohm reading between shield and head unit case?

That may point it back to the amp then. If I see greater than 1ohm, then head unit still has issues and I'll need to send it back to them to get fixed or replaced.

Thanks again for your assistance!!!

Tim

Perry Babin · 11th July 2011, 08:49 PM

What model Kenwood head unit is this?

Nagamitsu · 11th July 2011, 08:52 PM

Kenwood KDC-x493

Tim

Perry Babin · 11th July 2011, 08:56 PM

Do all RCA shields read the same (shield to case, not shield to shield)?

11th July 2011, 06:32 PM	#1
Nagamitsu diyAudio Member Join Date: Apr 2009	Paging Perry, if you are around, one issue with PPI Promos 425 Thanks Perry! Remember this that I posted: Help, can't figure out what resistors these are Ok, my deck issues taken care of, hooked everything up, I don't have sound through the rear output of the amp. I do have sound through the front output (that's where the resistors were worse off, compared to the rear side of the circuit board). One big difference here, and wondering if this could be the cause. The two capacitors in-line with the resistors on the front output, I changed those out. I did not change them out on the rear output, near the two heated up rear output resistors. Does this sound like a good possibility for the cause of no rear output? I am going to replace them just in case, just wanted your thoughts. Thanks in advance, Tim

11th July 2011, 08:10 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Confirm that the RCA shields for the rear channels read 0 ohms to the case of the head unit (no RCAs plugged in). __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

11th July 2011, 08:41 PM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	RCA Shield Repair __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

11th July 2011, 08:49 PM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	What model Kenwood head unit is this? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

11th July 2011, 08:56 PM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Do all RCA shields read the same (shield to case, not shield to shield)? __________________ 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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11th July 2011, 07:35 PM	#2
Nagamitsu diyAudio Member Join Date: Apr 2009	Ok, my mistake, thinking it could be the amp. One last thing to try. I tried speakers on both front and rear output, and I appear to have sound. Tried switching around RCAs too, just to make sure no problem on that end of things and seems fine. That leaves it down to my deck which just got back from having its outputs replaced/repaired by Kenwood warranty depot. I'll try hooking up the RCAs to the rear output on deck, currently they are on front output. Tim

11th July 2011, 08:07 PM	#3
Nagamitsu diyAudio Member Join Date: Apr 2009	RCAs on rear out of deck, same symptom. Symptom: No sound on right/passenger side Setup: PPI Promos 425 (4 channel), single RCA from front output on deck going to amp, split with a Y connector, plugged into all four amp RCA jacks. Front output of amp sending signal to driver/left side of car (crossover/components), where I have sound. Rear output of amp sending signal to passenger/right side of car (crossover/components), no sound. I think I have ruled out the amp. If I plug in RCA to rear RCAs on amp, and plug the driver speaker wires to the rear output of amp, I have sound in driver side. Same goes if I plug RCA into the front RCAs on amp, and driver side speakers to front output of amp. So issue maybe, somehow with my passenger side crossover, speakers, speaker wire I would think at this point. Ugh. Tim

11th July 2011, 08:48 PM	#7
Nagamitsu diyAudio Member Join Date: Apr 2009	Understood now. So your thoughts (which would mean the Kenwood warranty depot didn't fix it fully) are that the shield ground might be open. The result I "want" to see, to confirm head unit is ok, is a less than 1ohm reading between shield and head unit case? That may point it back to the amp then. If I see greater than 1ohm, then head unit still has issues and I'll need to send it back to them to get fixed or replaced. Thanks again for your assistance!!! Tim

11th July 2011, 08:52 PM	#9
Nagamitsu diyAudio Member Join Date: Apr 2009	Kenwood KDC-x493 Tim

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