Bosch HMV9302 Service Manual - Page 28

COMPONENTS TOUCH KEY BOARD TEST PROCEDURES Measure the resistance between terminal pins of connector KEY CONNECTOR. NOTE: When reconnecting the FPC connector, make sure that the holes on the FPC connector are properly engaged with hooks on the plastic fastener. MATRIX CIRCUIT FOR TOUCH KEY BOARD CONNECTOR(KEY CON) 1 2 3 4 5 6 7 VENT HI/LO/OFF HELP N.C N.C PROGRAM 5 0 8 LIGHT CONTROL HI/LO/OFF SET-UP N.C N.C AUTO DEFROST 6 1 9 LESS CLOCK EASY COOK N.C KITCHEN TIMER 7 2 10 FAVORITE LIGHT TIME RECIPE TIMER DEFROST N.C POWER LEVEL 8 3 11 T/TABLE STOP ON/OFF CLEAR START QUICK HOLD DEFROST WARM 9 4 12 MORE 13 SENSOR SENSOR SENSOR SENSOR SENSOR SENSOR PIZZA POTATO POPCORN VEGETABLE REHEAT COOK Figure 27 RESULTS Resistance value When When not touched touched Less than More than 400 ohms 1 mega ohm FPC CONNECTOR Top 1 2 3 4 5 6 7 8 9 10 11 12 13 Figure 28 SENSOR (For sensor model only) 1 BK 2 RD 3 WH Figure 29 Normal: Approximately BK~RD: 4.5~6.2 Kohm RD~WH: 2.0~3.5 Kohm BK~WH: 2.0~3.5 Kohm Abnormal: Infinite or several. 7-17