LiftMaster RSL12U RSL12U Troubleshooting Guide Manual - Page 26

MODELS CSL24U AND CSW24U SYMPTOM: Operator does not have power. MODEL CSW24U POWER MODEL CSL24U CONTROL BOARD CONTROL BOARD OUTLET HOUSING OUTLET HOUSING BATTERIES BATTERIES TRANSFORMER and BRIDGE RECTIFIER located on chassis, behind the electrical box. TRANSFORMER and BRIDGE RECTIFIER located on chassis, behind the electrical box. CONTROL BOARD 6 Check the batteries.* Check the battery connections. Make sure two 7AH batteries OR two 33AH batteries are connected in series. Check the voltage coming from each 2 Check the AC power switch. Is it ON? battery by disconnecting the battery from the operator. A fully charged (Back of Outlet Housing) battery should read 12.8 to 13.3 Vdc per battery. If not, replace the batteries. DIAGNOSTICS Fuse 7 Check the control board. Try replacing the fuse on the control board. If that does not work, replace the control board. EMI BOARD Battery Red J15 Plug * Red Black 12V 7AH Battery 12V 7AH Black OUTLET HOUSING Black Green White 120 240 Power Wiring Sockets (120 Vac factory default) Gray Blue Brown HOT GROUND NEUTRAL White Purple Black Power Wiring Connector Input Power Connection 3 1 Check the incoming power.* Check breaker first, then check wiring coming into operator. The voltage should be 120 Vac or 240 Vac depending on the application. Check the power wiring connector. Is it plugged into the correct socket? TRANSFORMER 5 Check the bridge rectifier.* Orange -+ -- BRIDGE Orange RECTIFIER Check the voltage coming out of the bridge rectifer (red and black wires).The reading should be 35 Vdc (+/- 15%). If not, replace the bridge rectifier. 4 Check the transformer.* Check the transformer voltage going into the bridge rectifier (orange wires). The reading should be 24 Vac (+/- 15%). If not, replace the transformer. 25