Sharp R-209FW Service Manual - Page 15
Motor Winding Test, High Voltage Fuse F2 Test, Timer Motor Test
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TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST Using an ohmmeter, check between the terminals as described in the following table. MEASURING POINTS Between N and L Between terminal N and WHITE Between terminal L and RED INDICATION OF OHMMETER Open circuit Short circuit Short circuit R-209(IN) R-209(W) R-209(Y) NOISE FILTER N L F1: FUSE T6.3A NOISE SUPPRESSION COIL LINE CROSS CAPACITOR 0.068µ/AC250V If incorrect readings are obtained, replace the noise filter unit. CARRY OUT 4R CHECKS. LINE BYPASS CAPACITOR 0.0022µ/AC250V WHT LINE BYPASS CAPACITOR 0.0022µ/AC250V RED I MOTOR WINDING TEST CARRY OUT 3D CHECKS. Disconnect the leads from the motor. Using an ohmmeter, check the resistance between the two terminals as described in the table below. Table: Resistance of Motor Motors Resistance Fan motor Approximately 400 Ω Turntable motor Approximately 14.5 kΩ If incorrect readings are obtained, replace the motor. CARRY OUT 4R CHECKS. J HIGH VOLTAGE FUSE F2 TEST CARRY OUT 3D CHECKS. If the high voltage fuse is blown, there could be a short in the high voltage rectifier or the magnetron. Check them and replace the defective parts and the high voltage fuse. CARRY OUT 4R CHECKS. CAUTION: ONLY REPLACE HIGH VOLTAGE FUSE WITH THE CORRECT VALUE REPLACEMENT. K TIMER MOTOR TEST 4 M 3 CARRY OUT 3D CHECKS before any of the following timer tests. 2 1 TIMER SWITCH- CONTACTS Disconnect the leads from terminals described at following table. Connect an ohmmeter across terminals described at following table. Advance the timer and check that a short circuit reading is obtained on the meter. Turn the timer back to the zero (0) position and check that an open circuit reading is obtained on the meter. If these readings are not obtained then replace the timer. Disconnecting and checking terminals 1 and 2 TIMER - MOTOR Disconnect the leads from terminals described at following table. Connect an ohmmeter across the timer motor winding, terminals are described at following table, and check that a reading of resistance described at following table is indicated. If this reading is not obtained then the timer is probably defective and should be replaced. Disconnecting and checking terminals Resistance of motor winding 3 and 4 approximately 22.2 kohms CARRY OUT 4R CHECKS after any of the above tests. 13