4-20     Change 1 4-16.  REPAIR OF CONTROL PANEL ASSEMBLY FOR MODEL RAK-15 (Continued) a.  Removal of Control Panel.      (1)  Support the control panel (1) by hand and remove four mounting screws (2) until it is detached from the main case (3).      The gasket (4) usually remains on the case.      (2)   Withdraw control panel (1) to the full extent of the interconnect wiring (5). (3)   Disconnect 03 and 06 heater power supply wires (6) from connectors P2 (7) and P4 (8) on the PCB       (11).            (4)  Disconnect overheat sensor/boil-dry sensor connector (9) from connector CONN 1 (10) on the PCB         (11). (5)   Remove and retain the control panel (1) complete with gasket (4) and mounting screws (2). b.  Test of Toggle Switch. (1)   Operate switch (12) between the LO, OFF and HI  positions and verify that the action is firm with a positive stop in each position. (2)   Disconnect switch connector (13) from connector CONN 2 (14) on the PCB (11).                   NOTE In steps (3) and (4) "open-circuit" is taken to be a reading greater than 50 ohms and "continuity" is taken to be a reading less than 0.5 ohms.   A key (15) is provided for pin identification. (3)    Using the digital multimeter (16) set to read resistance, perform the following:         a.   Set switch (12) to the OFF  (center) position and check that an open-circuit reading is obtained           between pins 1 & 2 (15), pi ns 2 & 3 (15), pins 4 & 5  (15) and pins 5 & 6 (15).         b.   Set switch (12) to the LO (left) position and check that a continuity reading is obtained between            pins 1 & 2 (15) and pins 4  & 5 (15). Check also that an open-circuit reading is obtained            between pins 5 & 6 (15).           C.    Set switch (12) to the HI (right) position and check that a continuity reading is obtained           between pins2 &3 (15) and pi ns5&6 (15). Check also that an open-circuit reading is           obtained between pins 4 & 5 (15). (4)   Using the digital multimeter (16) set to read resistance, check that a continuity reading is obtained for each track of the   ribbon-cable (17) between the switch (12) to the control panel (1).        c.  Removal of Toggle Switch. (1)   Verify that switch connector (13) is disconnected from connector CONN 2 (14) on the PCB (11). (2)   Loosen lock nut (18) securing the switch (12) to the control panel (1). (3)   Remove and retain the lock nut (18), washer (19), switch guard (20) and switch gasket (21). (4)   Withdraw the toggle switch (12) from the rear of the control panel (1).