Car Stereos: ca stereo kedison ED-9604LC dead, kia6210ah, power amp

Question
My regards,the afforsaid model is built using kia6210ah as power amp,NJU6432B display drvr,la1140 fm if, edition 1000 as system IC etc, ok .My problem is there is no power or set is dead.The power supply for the system is checked and no problem found.What to replace, how to diagnose ?..kined attention and help always oblised. dont mined my poor english thank you

Answer
Hi Gudda,

Are you sure there's power getting to the system?  Power comes into a deck via THREE wires.  One is a constant (keeps your radio settings, clock time, etc.)  One is ground to provide the electricty a path back to the battery, and one is 12V switched.  It tells the deck when it should turn on.  You need to make sure all 3 of these wires are working.  You should get 12V from constant to ground when the car is off and on, 12V from accessory to ground when the car is on, 0V from accessory to ground when the car is off.  If you're getting that, then the deck is dead.  If you're not, check your fuses.

Justin