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the only 2 wires you dont want to cross are red and black . once you have red from radio red from harness, black from radio black from harness connected it should light up ..the speaker wires can be "trial and error" . if red and black together dosent light it up check the fuse on the radio and on incoming red wire. try bringing 2 wires straight from the battery with a fuse between the red one to radio,if it dosent light up then with "direct power " then the radio needs to come apart to see ether internal fuse or burnt our circuit. ps: sometimes you only need to connect the red "live" wire and touch the black on the casing of the radio to test for life.
if you have no life and you changed the fuse the you have a dead power supply,.that is the board you replaced the fuse,.is there a red light showing, or flashing, if not then you do have power problem,.did you see and capastors popped,.
This normally indicates a battery problem. Remove the battery and wipe the contacts (battery and camera) firmly with a dry cloth to remove any corrosion that may have built up on them. Heavy corrosion may require cleaning with a fine wire brush, steel wool, or sandpaper. After cleaning, remove any debris that may have fallen into the battery compartment, then insert the battery and connect the camera to the charger. If the green light stays on, the problem is gone and you can charge the battery for several hours and then use the camera. If the red light comes on, it's likely time to replace the battery - especially if it's more than a year old.
HINT: Always remove the battery if you don't plan to use the camera for a week or more. This will prevent corrosion buildup and extend both battery life and camera life.
There are 2 possible reasons. Charger is incompatible/defective or Battery is no longer charging due to its 500 cycles life. You may check the output of the charger with Voltmeter/Multimeter if its stable 5V, If its stable then best thing to replace the battery. Good Luck
The HL-2070N gets stuck in a toner end-of-life error condition. Perform the following to clear :
With paper loaded, new toner in,
Open front door
Turn off printer
While holding down the GO button, turn printer back on
When all four LEDs light up release GO button. All LEDs will turn off
Press the GO button 2 times. The 3 LEDs (toner, drum, paper) will light up solid
Press the GO button 5 times
Paper light will be blinking
At this point the toner end-of-life condition has been reset. Close front door.
BTW, I got this from Brother Support. Also, just a reminder, timing is important here so don't pause between button presses.