Question about Pioneer DEH-P3500 CD Player
Pioneer DEH P3500 car tuner/cd: low output from right, rear channel. Connect different tuner to harness, RR channel fine. Not a balance or fader control problem. Seems like mosfet pal 7000a IC amp chip output would just operate or fail, not give severely reduced output on one. Other possible component failure? Capacitor(s)? All solder joints are good, no signs of baked parts. Problem occured suddenly without prior signs of trouble. Whuddup? -G in AZ
It's very rare for one channel to fail leaving the others in perfect working order. It's possible but rare.
To determine if the problem is the IC or something before the IC, you would need a scope or a signal tracer (something that will allow you to hear the signal on various test points). I've used one of the Radio Shack mini-amplifiers. It's simply a battery powered amplifier with a small speaker. I'm sure that something similar is available from Maplin or a similar dealer. You would use that or a scope to check the level of the signals going into the power amp IC.
The subwoofer output has dedicated outputs from the electronic volume control IC. The rear signal from the volume control IC goes only to the rear channel inputs of the power amp IC.
You'll have to trace the signal to determine whether it's the volume control IC or the power amp IC. There are 2 capacitors in series with the signal line. They could be defective AND that would likely cause the signal to be low
If you haven't done so yet, you may want to connect a speaker directly to the head unit's harness (after disconnecting the speaker wires going to the rear of the vehicle). A short to ground could be causing the problem. The chip should shut down completely in case of a short but high resistance in the speaker wire could prevent the protection circuit from engaging.
Did you run new wires or did you use the OEM wiring? If you used the OEM wiring, there may be an OEM amp in line causing the problem.
C317, C318 near the power amp IC.
C222 is a bypass cap and would only cause a problem if it was shorted, leaking or the wrong value.
R250 is a 100 ohm resistor. If it's not properly soldered, the wrong value or defective, it could possibly cause the output to be low.
Be aware that one slip of the meter probe can lead to catastrophic damage. If you damage the volume IC, you will not likely be able to replace it yourself. The copper on the board is VERY easy to damage. With luck, the input levels on all 4 inputs of the power amp IC will be equal.
From the layout, it looks like the caps are surface mount devices. If so, do not try to replace the caps. Head unit circuit boards are not very robust. If you are not extremely careful, you will damage the board and it may be very difficult to repair. There's no point in replacing anything that is not defective.
HOPE THAT FIXED UR PROBLEM
THANK YOU HAVE A NICE DAY
Posted on May 10, 2009
As you have already checked your cd player but would also like to confirm have you checked the wiring of the player if its fine as it could also be due to loose wires. If thats not the case then its definetly the IC that needs to be replaced.
Please do accept the solution and revert for further assistance.
Posted on May 10, 2009
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Posted on Jan 02, 2017
Tips for a great answer:
1993 Chevrolet S10 Blazer Car Stereo Radio Wiring Diagram.
Radio Constant 12V+ Wire: Orange
Radio Switched 12V+ Wire: Yellow
Radio Ground Wire: Black
Radio Illumination Wire: Gray
Radio Dimmer Wire: Brown
Radio Antenna Trigger Wire: Pink
Radio Amp Trigger Wire: N/A
Front Speakers Size: 4? x 6? Speakers
Front Speakers Location: Dash
Left Front Speaker Wire (+): Tan
Left Front Speaker Wire (-): Gray
Right Front Speaker Wire (+): Light Green
Right Front Speaker Wire (-): Dark Green
Rear Speakers Size: 6? x 9? Speakers
Rear Speakers Location: Side Panels
Left Rear Speaker Wire (+): Brown
Left Rear Speaker Wire (-): Yellow
Right Rear Speaker Wire (+): Dark Blue
Right Rear Speaker Wire (-): Light Blue
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