Sharp R-204EWA Service Manual - Page 25

R-204EWA CAUTION: 1. DISCONNECT OVEN FROM POWER SUPPLY BEFORE REMOVING OUTER CASE. 2. DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING. NOTE: When replacing the outer case, the 2 special Torx screws must be reinstalled in the same locations. MAGNETRON REMOVAL 1. Disconnect the power supply cord and remove outer case. 2. Open the oven door and block it open. 3. Discharge high voltage capacitor. 4. Disconnect the wire leads from magnetron. 5. Remove the three (3) screws holding the magnetron to the waveguide. 6. Remove the magnetron from waveguide. 7. Now, the magnetron is free. CAUTION: WHEN REPLACING THE MAGNETRON, BE SURE THE R.F. GASKET IS IN PLACE AND THE MAGNETRON MOUNTING SCREWS ARE TIGHTENED SECURELY. HIGH VOLTAGE COMPONENTS REMOVAL (HIGH VOLTAGE CAPACITOR AND HIGH VOLTAGE RECTIFIER ASSEMBLY) To remove the components, proceed as follows. 1. Disconnect the power supply cord and remove outer case. 2. Open the oven door and block it open. 3. Discharge high voltage capacitor. 4. Remove one (1) screw holding capacitor holder to rear cabinet. 5. Disconnect the H.V. wire of the H.V. rectifier assembly from the magnetron. 6. Disconnect the filament lead of the power transformer from the H.V. capacitor. 7. Remove one (1) screw holding ground side terminal of high voltage rectifier assembly, and remove capacitor holder. 8. Disconnect all the leads and terminals of high voltage rectifier assembly from high voltage capacitor. 9. Now the H.V. rectifier assembly and H.V. capacitor should be free. CAUTION: WHEN REPLACING HIGH VOLTAGE RECTIFIER ASSEMBLY, ENSURE THAT THE CATHODE (GROUND) CONNECTION IS SECURELY FIXED TO THE CAPACITOR HOLDER WITH A GROUNDING SCREW. CAUTION: DO NOT REPLACE ONLY HIGH VOLTAGE RECTIFIER. WHEN REPLACING IT, REPLACE HIGH VOLTAGE RECTIFIER ASSEMBLY. POWER TRANSFORMER REMOVAL 1. Disconnect the power supply cord and remove outer case. 2. Open the oven door and block it open. 3. Discharge high voltage capacitor. 4. Disconnect the wire leads (main wire harness and H.V. wire) from power transformer. 5. Disconnect the lead from magnetron filament. 6. Disconnect the lead of the power transformer from high voltage capacitor. 7. Remove the two (2) screws holding the transformer to bottom plate from below. 8. Remove the two (2) screws holding the transformer to bottom plate from above. 9. Remove the transformer. 10.Now the power transformer is free. Re-install 1. Rest transformer on the bottom plate with its primary terminals toward the oven face plate. 2. Secure transformer with two (2) screws to the bottom plate from above. 3. Secure transformer with two (2) screws to the bottom plate from below. 4. Re-connect wire leads (primary and high voltage) and filament leads to the power transformer, magnetron and high voltage capacitor, referring to "Pictorial Diagram". 5. Re-install outer case and check that the oven is operating properly. POSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVAL 1. Disconnect the power supply cord, and remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. 4. Push the lever of positive lock® connector. 5. Pull down on the positive lock® connector. Positive lock® connector Lever CAUTION: WHEN CONNECTING THE POSITIVE LOCK® CONNECTORS TO THE TERMINALS, INSTALL THE POSITIVE LOCK® SO THAT THE LEVER FACES YOU. Figure C-2. Positive lock® connector 23 Terminal 1 Push 2 Pull down