Sharp R-209FW Service Manual - Page 11

TROUBLESHOOTING GUIDE R-209(IN) R-209(W) R-209(Y) When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Many of the possible causes of trouble will require that a specific test be performed. These tests are given a procedure letter which will be found in the "Test Procedure" section. IMPORTANT: If the oven becomes inoperative because of a blown fuse F1 T6.3A in the monitored latch switch SW1 - timer switch - monitor switch circuit, check the monitored latch switch SW1, timer switch and monitor switch SW2 before replacing the fuse F1 T6.3A. CK = Check / RE = Replace TEST PROCEDURE A B C CK D E E E F K K I I G L M N RE CKCKRECK CKCKCK CK H J POSSIBLE CAUSE AND DEFECTIVE PARTS MAGNETRON HIGH VOLTAGE TRANSFORMER H.V. RECTIFIER ASSEMBLY HIGH VOLTAGE WIRE HIGH VOLTAGE CAPACITOR MONITORED LATCH SWITCH SW1 LATCH SWITCH SW3 MONITOR SWITCH SW2 TEMPERATURE FUSE TF TIMER MOTOR TIMER SWITCH FAN MOTOR TURNTABLE MOTOR FUSE F1 T6.3A CONTROL UNIT RELAY (RY-1) FOIL PATERN ON P.W.B. POWER SUPPLY CORD SHORTED WIRE HARNESS OPENED WIRE HARNESS OVEN LAMP WALL OUTLET MISADJUSTMENT SWITCH HOME FUSE OR BREAKER BLOCKED COOLING FAN BLOCKED VENTILATION NOISE FILTER H.V. FUSE F2 CONDITION PROBLEM OFF CONDITION Home fuse blows when power supply cord is plugged into wall outlet. FUSE F1 T6.3A blows when power supply cord is plugged into wall outlet. Oven does not start when the timer is set. Oven lamp does not light (Other function is normal.) Fan motor does not operate. (Other function is normal.) Turntable motor does not operate. (Other function is normal.) Oven or any electrical parts ON CONDITION does not stop. Oven seems to be operating but little or no heat is produced in oven load. (Microwave power level is set at 800W) Oven does not seems to be operating properly when 560W, 400W, 240W or 80W is set. (Oven operates properly at 800W.) Oven goes into cook cycle but shuts down before end of cooking cycle. 9