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Re: F61 code after a speaker wire touched the chassis and...
You have shorted the speaker wores and blown the output amp pac. Depending upon the model, the replacement part varies from $75-$95.I don't have a listing for the SC-HT740, but the cost range should be accurate.
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#2 cylinder misfire. Plug, wire, or coil pack. One of them is bad. My guess is the coil pack. Pull the wire off the coil, lay it on top the coil close to the #2 port. Start the van. You should see the coil throwing an arc to the plug wire. No arc replace the coil. If you have arc, then replace the plug and wire. I would do all of them.
There are no error codes in the users manual. In this series of models panasonic has standardized error code meanings. F61 means a failure in the power out circuits. Your first option is to remove all your speakers and the associated wiring with the power off. Repower unit and see if error is still there. If not, you have a speaker or wiring problem. If still there, you have an internal failure requiring service.
The illumination wires (orange, not yellow. Yellow is for 12 volt in) would not have an effect on sound. Either the internal amp is blown or you have a shorted speaker which is preventing the internal amp from turning on. Disconnect all speakers and hook a KNOWN GOOD one to an output. I f you get sound, the problem is in the car, if not, the problem is in the radio. If you accidentally crossed two of the speaker wires or let one touch a chassis ground, you blew the amp.
Hook 1 speaker to the white (+) and white/black (-) wires and the 2nd speaker to the gray (+) and gray/black(-) wires.
The green and the purple wires are the other speaker wires dont use them cut them so they are connected to anything and tape them with black electric tape so they wont short out and touch the chassis of the car by accident. Also dont let them touch each other too thats why you have to tape the exposed wires and insulate them. Many people forget to do that.
You possibly took out the output ic by crossing speaker wires or touch one to the case when the other was in the terminal. (turn off and unplug when moving speaker wires)
Before taking it in remove all wires unplug power cord wait 30 seconds and plug just the power cord and turn on. If it still goes to f61 it's going to most likely need the output ic replaced.
$70-90 labor and about $100 for the part.
spark plugs been changed ? cheap plugs can cause this. spark plug wires ok? broken spark plug wire can cause this too or one just arcing to ground pass a loose boot raise hood after dark and run motor watch over all wires to see anything noticeable. Dont touch anything while running or things could go bad for you fast... some electric fan motor have a filter bolted to them this could be? does it vary with the engine? or stay one level? if all else fails it might be easyer to pick up a filter and install it in the power cable to your radio?
The error code your unit is presenting relates to either a speaker cabling fault or a fault speaker. Sometimes, it is neither, and may be a fault inside the unit. Needless to say the unit is in protection moe to prevent more damage occurring. Check you speaker wiring for any short circuits or frayed wires. If all appears to be ok, disconnect the wires from the unit and see if it turns on and stays on then. If it still presents f61 with speakers and cable disconnected, then I am afraid that you may need to take the unit to a Kenwood service center near to you for an inspection . Good luck
search for a short to chassis when you mount the speaker,there's no problem if the magnet touch the chassis. you can test the cables with a multimeter.check if the tiny flexible cables on the speaker touch metal when is in movement.
F61 tells you its a power source problem according to the manual. to all F61 error it is very likley that the str470-050a reg legs desolderd and have broken away from the main body of the regulator giving you the f61 and shut down.