Car Stereo - Kenwood KDC241

[Warlord_1011]

Hello all, i recently bought a second hand car and the previous owner had installed a Kenwood KDC-241 stereo, so far it has been ok, however he admitted there was a problem with the AUX input. The Left channel is fine, however the Right channel is extremely quiet...

Now I used my Multimeter to measure the Impedance, and surprise surprise the Left channel has an Impedance of 10Kohm and the Right channel is 11 Ohm. I also changed the balance to +8 db on the right channel the channels sounded roughly equal, however obviously the moment I change the source, the balance then has too much emphasis on the right channel.

Basically from what i can understand the problem is where the AUX input's volume is controlled, does anyone have any advice or ideas on what the issue could be?

 

[Nigel Goodwin]

If it reads 11ohms there's fairly obviously a serious short across the input - however, you can't measure impedance with a multimeter anyway, you were measuring resistance.

Do you have a circuit for the Kenwood?.

 

[Warlord_1011]

No i cant find it anywhere on the Internet and the manual is only for setup and operation, it has no mention of a circuit diagram

 

[leal]

kenwood kdc-241

Try this, perhaps it might be usefull.

 

[Nigel Goodwin]

Thanks to leal for the diagram (even though it has the longest filename ever seen ), basically there can't be much wrong at all.

Aux In R is on pin 18 of J3 which the front panel plugs in to. I would suggest trying to measure the resistance of pin 18 to chassis with the front removed, which should be 10K odd - same as the left channel.

If it reads 10K then the fault is on the plugin front panel, and is most likely a damaged socket - there's VERY little in the main unit that could cause it, and those few options are VERY, VERY unlikely.

 

[Warlord_1011]

WOW thats leal, thats a great help!, i see what you mean Nigel, Im going to open it up and have a look inside etc, hopefully it will be a simple fix

 

[Nigel Goodwin]

WOW thats leal, thats a great help!, i see what you mean Nigel, Im going to open it up and have a look inside etc, hopefully it will be a simple fix

I'm assuming the front panel unclips?, so you don't need to take it apart much.

 

[Warlord_1011]

yea J1 are connected to the 20 pins behind the front LCD panel, so i will take it off and test it

 

[Warlord_1011]

I took the front panel off and tested the resistance, and the connector is fine, there is definitely a problem with the circuitry...

 

[Nigel Goodwin]

I took the front panel off and tested the resistance, and the connector is fine, there is definitely a problem with the circuitry...

Like I said, there's almost nothing internal that can cause such a fault - and those possibilities are EXTREMELY unlikely. Most likely cause is an external short across the input somewhere, perhaps even a blob of solder across the PCB where it wasn't make correctly (assuming it's never worked from new).