SERVICE MANUAL 6900-( )-( ) HIGH SPEED SANDWICH PRESS
CAUTION PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY (a) Do not operate or allow the oven to be operated with the door open. (b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source, and make repairs as necessary: (1) interlock operation. (2) proper door closing. (3) seal and sealing surfaces (arcing, wear, and other damage). (4) damage to or loosening of hinges and latches.
ELECTRICAL INSTALLATION For all cord connected appliances: GROUNDING INSTRUCTIONS This appliance must be grounded. In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the electric current. This appliance is equipped with a cord having a grounding wire with a grounding plug. The plug must be plugged into an outlet that is properly installed and grounded. WARNING — Improper use of the grounding can result in the risk of electric shock.
SAFETY INSTRUCTIONS PLEASE READ THIS ENTIRE PAGE BEFORE BEGINNING ANY SERVICE ACTIVITES This manual is to assist the authorized service agent that has been trained by NEMCO on the proper service procedures for this appliance. If at any time the service agent is unsure how to properly or safely service the sandwich press; they should contact NEMCO immediately for instructions.
PRODUCT SPECIFICATIONS Model Number: Supply Voltage 6900-VVV-CC Frequency Supply 60 Hz L1+L2+Gnd (US 30A Plug) L1+L2+Gnd (Canada 50A Plug) L1+L2+Gnd (US/Canada 30A Plug) VVV 208 = 208V 240 = 240V Power Power Output External Dimensions With The Upper Enclosure Open Weight Exterior Construction Customer Country CC GM=General Market US/Canada 208V or 240V Microwave (combined) Microwave (combined) Heaters (combined) Height 208V 60Hz 28Amps 240V 60Hz 24Amps 2000W – Rated 1400W - Output 2000W – 1000W
INSTALLATION INSTRUCTIONS Power Supply Requirements The sandwich press MUST be connected to a properly grounded receptacle that is correctly rated for the current listed on the device’s product label or MUST be hard-wired to the supply with a proper ground. The sandwich press should be connected to its own power circuit (Type C or Time Delay circuit breaker).
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. On/Off Switch – This gives the user the ability to turn the appliance On or Off. Note: this does NOT turn power off to every internal component. Adjustable Legs – Gives the installer the ability to level the press as needed. Sandwich Press Cavity – The cavity is constructed with stainless steel and a nonstick coating. Heating Platens – These can be grooved or flat heating surfaces.
CONTROL FEATURES POWER SWITCH – Toggle switch to “ON” to energize the control. Turning the switch to “OFF” will power down the control and cancel any menu. MENU BUTTONS – Pressing any of the menu buttons will cause the red circle next to the corresponding button to illuminate. Once the lid is closed; the sandwich press will run the selected program. DISPLAY AREA – This area will display temperatures, menu time, and error codes.
COMPONENT LOCATIONS UPPER CAVITY MAGNETRONS - MAGNETRON HIGH LIMIT SWITCHES - HEATER PLATE RELEASE MECHANISM & HEIGHT ADJUSTMENT COLLAR MAGNETRON COOLING FANS - UPPER HEATER PLATE THERMOCOUPLE CONNECTION
REAR ENCLOSURE ELECTROMAGNET - MAGENT SWITCH – PRIMARY, SECONDARY, & INTERLOCK SWITCHES – LID SPRINGS – LID DAMPENER – GAS SHOCK
LOWER ENCLOSURE LINE FUSES (30A) – INTERLOCK FUSE (20A) CONTROL BOARD – BUZZER – 12V TRANSFORMER – HIGH LIMIT THERMOSTAT (MANUAL RESET) – FUSE, CONTROL BOARD (3A) – HEATER PLATE THERMOCOUPLE CONNECTIONS – POWER SWITCH
HIGH VOLTAGE TRANSFORMERS – COOLING FAN CAPCITORS - DIODES
MICROWAVE EMISSION TEST WARNING Microwave emission testing must be performed after this appliance is serviced. The emission should be less than 5mW/cm2; contact NEMCO if the emissions is higher than 5mW/cm2. Written records must be taken of repairs made and of the emission readings that were taken to fulfill the requirements set by the DHHS and Canada’s Health and Welfare regulation.
COMPONENT TESTING (Page 1) WARNING The microwave circuit in this appliance is extremely dangerous. DO NOT take any voltage measurements from the magnetron, HV capacitor, HV transformer, or filament transformer while the sandwich press is running. Doing so could result in serious injury or DEATH! WARNING The HV capacitors hold a high voltage charge even when the appliance is not running a menu cycle and for a short period of time after the sandwich press is unplugged.
COMPONENT TESTING (Page 2) WARNING The microwave circuit in this appliance is extremely dangerous. DO NOT take any voltage measurements from the magnetron, HV capacitor, HV transformer, or filament transformer while the sandwich press is running. Doing so could result in serious injury or DEATH! WARNING The HV capacitors hold a high voltage charge even when the appliance is not running a menu cycle and for a short period of time after the sandwich press is unplugged.
COMPONENT TESTING (Page 3) WARNING The microwave circuit in this appliance is extremely dangerous. DO NOT take any voltage measurements from the magnetron, HV capacitor, HV transformer, or filament transformer while the sandwich press is running. Doing so could result in serious injury or DEATH! WARNING The HV capacitors hold a high voltage charge even when the appliance is not running a menu cycle and for a short period of time after the sandwich press is unplugged.
DOOR INTERLOCK SWITCH ADJUSTMENT (P. 1) The microwave circuit goes through an interlock switch system of 2 interlock switches and 1 monitor switch that prevents the generation of microwaves when the upper enclosure is open. Primary and Secondary Interlock Switches All of the L1 line voltage for the microwave circuits goes through the primary and secondary switches. The primary switch will open the circuit when the door is open, thus eliminating the L1 supply to the transformers.
DOOR INTERLOCK SWITCH ADJUSTMENT (P. 2) MONITOR SWITCH PRIMARY SWITCH SECONDARY SWITCH 1. 2. 3. 4. Disconnect the press from the power supply. Loosen (2) screws on each of the switch brackets. Place a ½” spacer on the front ledge of the press and pull down the lid. With the lid pulled down push the bottom switch bracket in towards the magnet disc until it is engaged. After the switch is engaged, tighten down both screws. 5. Replace the ½” spacer with a ¼” spacer. 6.
TROUBLE SHOOTING GUIDE SYMPTOM POSSIBLE CAUSE No power Check to ensure press is plugged in. Check wall receptacle for power & proper voltage. Check 30A line fuses. Check 3A control board fuse. Check manual reset high limit thermostat. Check wire connections on 12V transformer and control board. Ensure that all 4 legs are level. Be sure lid is being pulled all the way down. Ensure that magnet disc is contacting the magnet when the lid is down. Ensure control board is supplying power to magnet.