LiftMaster RSL12U RSL12U Troubleshooting Guide Manual - Page 23

MODEL LA412U SYMPTOM: Operator does not have power. POWER CONTROL BOX CONTROL BOARD * 3 Check the control board.* Try replacing the fuse. If that does not work, replace the control board. CONTROL BOARD J15 Plug 20A Diode 1 Check the solar panels.* Check the voltage coming from the solar panels (red and black wires on the J15 plug labeled "DC POWER"). Check the voltage when the panel is in full sun. The voltage should be 12 Vdc (+/- 10%). If not, refer to the Solar Troubleshooting section. Solar Panels 10W minimum - 30W maximum, wired in parallel Battery 12V 7AH Battery 12V 7AH Red Black Black 10W 12V 2 Check the batteries.* Red Check the battery connections. Make sure there is one 7AH battery, two 7AH batteries wired in paralllel, OR one 33AH battery connected. Check the voltage coming from each battery by disconnecting the battery from the operator. A fully charged battery should read 12.8 to 13.3 Vdc per battery. If not, replace the batteries. 10W 12V 10W 12V 22