ACP DEC18M Service Manual

DEC18M* & MDC18MT Models Service Manual This Base Manual covers all Commercial Microwave Ovens. Refer to individual Technical Sheet for information on specific models. DEC18M DEC18MC DEC18MU DEC18MCX MDC18MT This manual is to be used by qualified service technicians only. ACP, Inc. does not assume any responsibility for property damage or personal injury for improper service procedures done by an unqualified person. 16400030 Revision 0 August 2016

Important Safety Instructions .............................................................................................. 1-4 Oven Specifications .......................................................................................................... 5-6 Quick Start Reference Guide ............................................................................................. 7-9 Component Location ...................................................................................................... 10-15 Airflow ........................................................................................................................... 16-17 Component Testing ........................................................................................................ 18-24 Wiring and Schematic Diagrams .................................................................................... 25-28 Notes Page ………………………………………...………………………………………………29

For additional product documentation or more detailed operating instructions visit: www.acpsolutions.com CONTACT INFORMATION Any questions or to locate an authorized ACP servicer, call ACP ComServ Service Support. –Inside the U.S.A. or Canada, call toll-free 866-426-2621. –Outside the U.S.A. and Canada, call 319-368-8120. –Email: [email protected]. Warranty service must be performed by an authorized ACP servicer. ACP also recommends contacting an authorized ACP servicer, or ACP ComServ Service Support if service is required after warranty expires. Important Safety Information. Read before using this oven. Keep these instructions for future reference. If the oven changes ownership, be sure this guide accompanies oven. PRECAUTIONS TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY A. DO NOT attempt to operate this oven with the door open since open door operation can result in harmful exposure to microwave energy. It is important not to defeat or tamper with the safety interlocks. B. DO NOT place any object between the oven front face and the door or allow soil or cleaner residue to accumulate on sealing surfaces. C. DO NOT operate the oven if it is damaged. It is particularly important that the oven door close properly and that there is no damage to the: 1. door (bent) 2. hinges and latches (broken or loosened) 3. door seals and sealing surfaces. D. The oven should not be adjusted or repaired by anyone except properly qualified service personnel.

the following safety instructions: General Use: 1. Do not use regular cooking thermometers in oven. Most cooking thermometers contain mercury and may cause an electrical arc, malfunction, or damage to oven. 2. Never use paper, plastic, or other combustible materials that are not intended for cooking. 3. When cooking with paper, plastic, or other combustible materials, follow manufacturer’s recommendations on product use. 4. Do not use paper towels which contain nylon or other synthetic fibers. Heated synthetics could melt and cause paper to ignite. 5. To avoid surface deterioration, keep the oven in a clean condition. Infrequent cleaning could adversely affect the life of the appliance and possible result in a hazardous situation. 6. Clean oven regularly and remove any food deposits. Heating Foods and Liquids: 7. Liquids such as water, coffee, or tea are able to be overheated beyond the boiling point without appearing to be boiling due to surface tension of the liquid. Visible bubbling or boiling when the container is removed from the microwave oven is not always present. THIS COULD RESULT IN VERY HOT LIQUIDS SUDDENLY BOILING OVER WHEN A SPOON OR OTHER UTENSIL IS INSERTED INTO THE LIQUID. To reduce the risk of injury to persons: • Do not overheat the liquid. • Stir the liquid both before and halfway through heating it. • Do not use straight-sided containers with narrow necks. • After heating, allow the container to stand in the microwave for a short time before removing it. b. Use extreme care when inserting a spoon or other utensil into the container. 8. Do not deep fat fry in oven. Fat could overheat and be hazardous to handle. 9. Do not cook or reheat eggs in shell or with an unbroken yolk using microwave energy. Pressure may build up and erupt. Pierce yolk with fork or knife before cooking. 10. Pierce skin of potatoes, tomatoes, and similar foods before cooking with microwave energy. When skin is pierced, steam escapes evenly. 11. Do not heat sealed containers or plastic bags in oven. Food or liquid could expand quickly and cause container or bag to break. Pierce or open container or bag before heating 12. Do not heat baby bottles in oven. 13. Baby food jars shall be open when heated and contents stirred or shaken before consumption, in order to avoid burns. 14. Never use oven to heat alcohol or food containing alcohol as it can more easily catch fire if overheated. Additional Microwave Oven Safety Instructions: 15. Do not operate equipment without load or food in oven cavity. 16. Use only popcorn in packages designed and labeled for microwave use. Popping time varies depending on oven wattage. Do not continue to heat after popping has stopped. Popcorn will scorch or burn. Do not leave oven unattended. 17. Do not use metal utensils in oven. 18. An authorized servicer MUST inspect equipment annually. Record all inspections and repairs for future use. CAUTION

19. Do not pop popcorn in this oven. 20. Do not use metal utensils in oven except when recommended by microwave food manufacturers or recipe requires metal utensils in convection or combination mode. Heat food in containers made of glass or china if possible. 21. Oven temperature is at least 450°F in convection mode. Verify plastic, paper or other combustible materials are recommended by the manufacturer to withstand the maximum oven temperature. 22. Racks, utensils, rack guides, and oven surfaces may become hot during or after use. Use utensils or protective clothing, like pan grips or dry oven mitts, when necessary to avoid burns. 23. Do not unplug oven immediately after use. Internal fan must cool oven to avoid damage of electrical components. 24. Caution: To avoid burns, do not use containers loaded with liquid or kitchen products that become liquid by heating at levels above those that can be easily observed.

To avoid risk of electrical shock, personal injury, or death, disconnect power to oven and discharge capacitor before servicing, unless testing requires power. Models DEC18M DEC18MC DEC18MU DEC18MCX MDC18MT Power Source Voltage AC 230/240V 220/240V 230/240V 220/240V 220V Amperage (single unit) 16A 16A 13A 16A 20A Frequency 50HZ 50HZ 50HZ 50HZ 60hz Single phase, 3 wire grounded Yes Yes Yes Yes Yes Plug Power Output Nominal microwave energy (IEC705) 1800W 2000W 1800W 2000W 1800W Minimum temperature rise (∆T) Operating frequency 2450 MHz 2450 MHz 2450 MHz 2450 MHz 2450 MHz Power Consumption Cook condition microwave 2900W 3100W 3100W 3100W 3100W Dimensions Cabinet Width 419 cm (16.5 in) 419 cm (16.5 in) 419 cm (16.5 in) 419 cm (16.5 in) 419 cm (16.5 in) Height 343 cm (13.5 in) 343 cm (13.5 in) 343 cm (13.5 in) 343 cm (13.5 in) 343 cm (13.5 in) Depth (includes door handle) 549 cm (21.63 in) 549 cm (21.63 in) 549 cm (21.63 in) 549 cm (21.63 in) 549 cm (21.63 in) Oven Interior Width 330 cm (13 in) 330 cm (13 in) 330 cm (13 in) 330 cm (13 in) 330 cm (13 in) Height 171 cm (6.75 in) 171 cm (6.75 in) 171 cm (6.75 in) 171 cm (6.75 in) 171 cm (6.75 in) Depth 305 cm (12 in) 305 cm (12 in) 305 cm (12 in) 305 cm (12 in) 305 cm (12 in) Weight Crated 34 kg (74 lbs) 34 kg (74 lbs) 34 kg (74 lbs) 34 kg (74 lbs) 34 kg (74 lbs) Uncrated 31 kg (68 lbs) 31 kg (68 lbs) 31 kg (68 lbs) 31 kg (68 lbs) 31 kg (68 lbs) Installation Unpacking Oven  Inspect oven for damage such as dents in door or dents inside oven cavity.  Report any dents or breakage to source of purchase immediately. Do not attempt to use oven if damaged.  Remove all materials from oven interior.  If oven has been stored in extremely cold area, wait a few hours before connecting power. Radio Interference Microwave operation may cause interference to radio, television, or similar. Reduce or eliminate interference by doing the following:  Clean door and sealing surfaces of oven according to instructions in “Care and Cleaning” section.  Place radio, television, wireless routers, etc. as far away as possible from oven.  Use a properly installed antenna on radio, television, etc. to obtain a stronger signal reception. CAUTION ! ! WARNING

BLOWER ASSEMBLY CAPACITORS DIODES INTERLOCK SWITCH BLOWER MOTOR BASEPAN TRIAC

LOW VOLT/HIGH VOLT CONTROL BOARD UPPER ANTENNA MOTOR MAGNETRONS FUSE LOW VOLT/HIGH VOLT CONTROL BOARD CAVITY THERMAL CUTOUT EXHAUST DUCTING TERMINAL BLOCK

ANTENNA SHIELD LOWER ANTENNA MOTOR LOWER ANTENNA KIT CERAMIC TRAY TRAY SUPPORTS WINDO W AIR FILTER UPPER ANTENNA CAVITY

LAMP WRAPPER POWER CORD REAR COVER AIR DUCT (optional) TRANSFORMER SPILL SHIELD 15

3. AIR PUSHED THROUGH MAGNETRONS 2. AIR IS DRAWN INTO BLOWER 4. AIR PUSHED CAVITY AND EXITS THROUG CAVITY DUCTS

Measure resistance across terminals. Cavity Thermal Fuse ....................................... Magnetron TCO .............................................. Open at 104° C (219° F). Open at 138° C (280° F) and closed at 82° C (180° F). Diodes Discharge Capacitors Remove diode lead from capacitor and connect ohmmeter. Reverse leads for second test. Infinite resistance should be measured in one direction and 50KΩ or more in the opposite direction. NOTE: Analog meter must contain a battery of 6 volts minimum. MT2 MT1 GA TE Triac Disconnect wires to triac. Measure resistance from: MT1 to MT2 .................................................... MT1 to Gate .................................................... MT2 to Gate .................................................... All terminals to ground .................................... Caution - Do not operate oven with wire to terminal MT2 removed. Infinite. Approximately 60 Ω or more. Infinite. Infinite. Capacitor Discharge Capacitors Remove wires from capacitor terminals and connect ohmmeter, set on highest resistance scale to terminals. Also check between each terminal and capacitor case. Between Terminals: Meter should momentarily deflect towards zero then return to over 5 MΩ. If no deflection occurs, or if continuous deflection occurs, replace capacitor. Terminal to Case: Infinite resistance. ALWAYS USE CORRECT SIZE

Measure resistance across terminals .............. Infinite. Magnetron Discharge Capacitors Remove wires from magnetron and connect ohmmeter to terminals. Also check between each terminal and ground. Between Terminals: Less than 1 Ω. Each terminal to ground measures Infinite resistance. NOTE: This test is not conclusive. If oven does not heat and all other components test good replace the magnetron and retest. Blower Motor Remove all wires from motor. Measure resistance across coil…………….. Approximately 30 Ω. Stirrer Motor Remove all wires from motor. Measure resistance across coil……………. Approximately 25k Ω. Earth Load Line Line Filter Line to Line ..................................................... Load to Load ................................................... Line to Load .................................................... Any terminal to Earth....................................... .8 M Ω .8 M Ω Continuity Infinite

measure resistance from: 230 to Common .............................................. Terminal 5 to 6 ................................................ Terminal 7 to 8 ................................................ Terminal 4 to Earth screw on transformer ..................................................... Terminal 4 to any other terminal ...................... 1 Ω. <1 Ω. <1 Ω. 38 Ω. Infinite Interlock switch assembly Disconnect wires to switch. With door open measure resistance from: Monitor – Terminals 3 - 4 ................. Primary – Terminals 1 - 2 ................. Secondary – Terminals 5 - 6 ............ With door closed measure resistance from: Monitor – Terminals 3 - 4 ................. Primary – Terminals 1 - 2 ................. Secondary – Terminals 5 - 6 ............ After verifying or replacing the module, re-connect wires to switch and check operation of monitor circuit before operating the oven. Indicates continuity Infinite  Infinite  Infinite  Indicates continuity Indicates continuity

Continuity is indicated as 100 Ω and below. Pin 1: Ground. 1 2 3 4 5 6 7 8 9 Split 10 Pad Traces 1 8 to 10 Continuity 2 7 to 10 Continuity 3 6 to 10 Continuity 4 5 to 10 Continuity 5 4 to 10 Continuity 6 3 to 10 Continuity 7 8 to 9 Continuity 8 7 to 9 Continuity 9 6 to 9 Continuity 0 5 to 9 Continuity Start 4 to 9 Continuity Stop 4 to 8 Continuity Power Lvl 5 to 8 Continuity X 2 6 to 8 Continuity Time Entry 7 to 8 Continuity Controller board P1 connector used for touch panel ribbon Line voltage to control board J4-1 to J4-6……………………. Output drive voltage to triac Triac terminals…………………. Gate—T1……………………… Fan relay (controls blower motor, antenna motor(s), and oven light) Terminals J4-1—J2-2…………. Cook relay Control board E1—E4…………… Line voltage (All Conditions) 0 VAC (Idle and Standby) 0.9 VAC (Cook) Line voltage (Standby and Cook) 0 volts (Idle) Line voltage (Idle) 0 volts (Standby and Cook)

Error Code Corrective Action F1 Replace HV/LV Board F2 Replace HV/LV Board F3 Replace HV/LV Board F4 Replace HV/LV Board F5 Replace Touch Panel F6 Replace HV/LV Board Usage Test The Usage Test is used to access Magnetron Hours, Magnetron Cycles and Door Cycles. Use the following procedure to access the data: 1. Open door. 2. Press and hold pad 3 for five (5) seconds. NOTE: After five (5) seconds, SErv illuminates in the display. 3. Press pad 1 for Magnetron Hours. 4. Press pad 2 for Magnetron Cycles. 5. Press pad 3 for Door Cycles.

standards. Using the IEC705 test method requires precision measurements and equipment that is not practical to be performed in the field. Using the test shown below will indicate if the oven performance is satisfactory. Test equipment required:  1000 ml test container and thermometer (Amana power test kit Fahrenheit / Menumaster power test kit Celsius).  Digital watch / watch with a second hand for use on ovens with electromechanical timers. Important Notes:  Low line voltage will cause low temperature rise / power output.  Ovens must be on a dedicated circuit, properly grounded, and polarized. Other equipment on the same circuit may cause a low temperature rise / power output.  This test and results are not a true IEC705 test procedure and are only intended to provide servicers with an easy means of determining if the microwave oven cooking output is correct. Procedure 1. Fill the test container to the 1000 ml line with cool tap water. NOTE: Water temperature should be approximately 60° F / 16° C. 2. Using the thermometer, stir water for five to ten seconds; measure, and record the temperature (T1). 3. Place test container of water in the center of oven cavity and close door. 4. Heat the water for a 33-second full power cycle. NOTE: Use a digital watch or a watch with a second hand for ovens with electromechanical timers. 1. At end of the cycle, remove test container. Using the thermometer, stir water for five to ten seconds and record temperature (T2). 2. Subtract the starting water temperature (T1), from the ending water temperature (T2) to obtain the temperature rise (∆T). 3. If the temperature rise (∆T) meets or exceeds the minimum, the test is complete. If the temperature rise (∆T) fails to meet the minimum temperature rise, test the line voltage to verify it is correct. Then repeat steps 1-6 making sure to change the water. If the temperature rise (∆T) fails to meet the minimum temperature rise again the oven will require service. COMPONENT TESTING Minimum Temperature Rise at Thirty-Three (33) Seconds Run Time ∆T Cooking ∆T Cooking ∆T Cooking ∆T Cooking (°F) Power Output (°F) Power Output (°C) Power Output (°C) Power Output 10 ................. 1000 20 ................. 2000 5 ............... 1000 11 ............ 2000 11 ................. 1100 21 ................. 2100 5.5 ............. 1100 11.5 ......... 2100 12 ................. 1200 22 ................. 2200 6.5 ............. 1200 12 ............ 2200 14 ................. 1400 24 ................. 2400 7.5 ............. 1400 13 ............ 2400 17 ................. 1700 25 ................. 2500 9.5 ............. 1700 13.5 ......... 2500 18 ................. 1800 27 ................. 2700 10 .............. 1800 15 ............ 2700 19 ................. 1900 30 ................. 3000 10.5 ........... 1900 16.5 ......... 3000