Maytag MEDB765FW W10240504 - Page 13

FOR SERVICE TECHNICIAN'S USE ONLY  If +5VDC is still missing, unplug dryer or disconnect power and replace the ACU.  If +5VDC returns, unplug dryer or disconnect power and check harnesses and connections between the ACU and user interface (UI). If acceptable, replace the UI. 8. Unplug dryer or disconnect power. 9. Reassemble all parts and panels. 10. Perform steps under "Service Test Mode", page 6, to verify repair.  If neither of the plug terminals have continuity with the left-most contact of the terminal block, replace the power cord and retest dryer. Power Cord N Plug Terminal Block L1 TEST #2: Supply Connections This test assumes that proper voltage is present at the outlet, and for U.S. installations, a visual inspection indicates that the power cord is securely fastened to the terminal block (electric dryer) or wire harness connection (gas dryer). ELECTRIC DRYER (U.S. Installations): 1. Unplug dryer or disconnect power. 2. Remove the cover plate from the top right corner of the back of the dryer. See figure 3. Cover Plate Remove Screws Figure 3 - Remove the cover plate. 3. With an ohmmeter, check for continuity between the neutral (N) terminal of the plug and the center contact on the terminal block. See figure 4a.  If there is no continuity, replace the power cord and test the dryer.  If there is continuity, go to step 4. 4. In a similar way, check which terminal of the plug is connected to the left-most contact on the terminal block and make a note of it. This will be L1 (black wire) in the wiring diagram. See figure 4a.  When this is found, go to step 5. COM Figure 4a - Plug-to-terminal connections for electric dryer. 5. Access the machine electronics without disconnecting any wiring to the ACU. 6. With an ohmmeter, check for continuity between the L1 terminal of the plug (found in step 4) and P9-2 (black wire) on the ACU.  If there is continuity, go to step 7.  If there is no continuity, check that wires to the terminal block are mechanically secure. If so, replace the main wire harness and test the dryer. 7. Check for continuity between the neutral (N) terminal of the plug and P8-3 (white wire) on the ACU.  If there is continuity, go to step 8.  If there is no continuity, and the mechanical connections of the wire are secure, replace the main wire harness. 8. Visually check that ALL connectors are fully inserted into the ACU. 9. Visually check that ALL connectors are fully inserted into the UI. 10. Reassemble all parts and panels. 11. Plug in dryer or reconnect power. 12. Perform steps under "Service Test Mode", page 6, to verify repair. ELECTRIC DRYER (Canadian Installations): 1. Unplug dryer or disconnect power. 2. Remove the cover plate from the top right corner of the back of the dryer. See figure 3. 3. Access the machine electronics without disconnecting any wiring to the ACU. DO NOT REMOVE OR DESTROY PAGE 13