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Service

High Speed Combination Oven for Subway

®

Restaurants

Service Manual

This Manual covers the MRX2SW High Speed
Combination Ovens equipped with Touch Screen
Controls. Refer to individual Service Manuals or
Technical Sheets for information on other specific
models.

MRX2SW

16400038

July 2019

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.

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Summary of Contents for MRX2SW

Page 1: ...uch Screen Controls Refer to individual Service Manuals or Technical Sheets for information on other specific models MRX2SW 16400038 July 2019 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 ...

Page 2: ...ide 7 Firmware Update Procedure 9 Care and Cleaning 10 Oven Construction 11 Component Testing Procedures 17 Interlock Switch Service 19 Service Test Mode 20 Error Code List 23 Microwave Power Test 24 Control Board Wiring 25 Wiring Diagrams Schematics 26 http services acpsolutions com SERVICE PARTS SUPPORT ...

Page 3: ...pedwiththepropertools parts testing instruments and the appropriate service information IT IS THE TECHNICIANS RESPONSIBLITY TO REVIEW ALL APPROPRIATE SERVICE INFORMATION BEFORE BEGINNING REPAIRS ComServ Support Center Web Site Telephone Number WWW ACPSOLUTIONS COM 1 866 811 8559 or 319 368 8195 E Mail commercialservice acpsolutions com Recognize Safety Symbols Words and Labels DANGER Immediate haz...

Page 4: ...e high voltage area of the equipmentcompartment Sometypesof failures will leave a charge in these capacitors and the dischargecouldcauseareflexactionwhichcould makeyouinjureyourself 7 Always remember that in the area of the transformer there is HIGH VOLTAGE When the unitisoperatingkeepthisareaclearandfreeof anythingwhichcouldpossiblycauseanarcor ground etc 8 Do not for any reason defeat the interl...

Page 5: ...lly designed to heat cook or dry food It is not designed for industrial or laboratory use 7 As with any equipment CLOSE SUPERVISION is necessary when used byCHILDREN 8 See door cleaning instructions 9 DO NOT heat baby bottles inoven 10 Baby food jars shall be open when heated and contents stirred or shaken before consumption in order to avoid burns 11 DO NOT operate this equipment if it has a dama...

Page 6: ...cian or pacemaker manufacturerabout effects of microwave energy on pacemaker 14 An authorized servicer MUST inspect equipment annually Record all inspections and repairs for future use SAVE THESE INSTRUCTIONS WARNING To avoid risk of fire in the oven cavity a DO NOT overcook food Carefully attend oven when paper plastic or other combustible materials are placed inside the oven to facilitate cookin...

Page 7: ...mperature Rise T 20 F 11 C Microwave Operating Frequency 2450mhz Temperature Range F C 200F 520F 95C 270C Connectivity USB Wifi Ethernet Control Type 7in 178mm Capacitance Dimensions Cabinet in cm Width 14in 356mm Height 22 75in 577mm Depth includes handle 29 125in 739mm Oven Interior in cm Width 12 25in 312mm Height 7in 178mm Depth 12 25in 312mm Weight lbs kg Uncrated 133lbs 60kg Crated 158lbs 72...

Page 8: ...ruct oven filters Allow access for filters to be cleaned H Install oven on level countertop surface I Outlet should be located so that plug is accessible when oven is in place Oven cord length is 60in 152cm STEP 3 Test Oven Operation J Ensure cooking plate is installed 1 Oven cavity must be cool to touch 2 Place shelf in oven with curve positioned towardthe the front of the oven This ensures prope...

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Page 11: ... press the home button and proceed to program loading 6 Select Software Version 7 Insert the USB flash drive with the new firmware into the USB port 8 A box will appear in the lower portion of the screen Rev xxxx Available Begin Update 9 Press this box to begin firmware update The screen will now display Entering Standby Mode for a few seconds and then the screen will go blank Continue to wait 10 ...

Page 12: ...CARE AND CLEANING 10 ...

Page 13: ...OVEN CONSTRUCTION CAVITY TOP FORCED AIR PLATE 4 SCREWS TO REMOVE COOKING PLATE MUST BE IN PLACE ALLOWS AIR FLOW UNDER FOOD 11 ...

Page 14: ...OX CAREFULLY PRY MICA COVER OUT OF POSITION USING SECURING TAB HELD IN WITH HIGH TEMP GASKETS LOOSEN 2 FRONT SCREWS AND REMOVE 2 BACK SECURING TABS MICA COVER REMOVAL AFTER FORCED AIR PLATE REMOVED ANTENNAS From Inside Cavity 12 ...

Page 15: ...POWER SUPPLY BOARD 24VDC PRIMARY SWITCH DOOR SECONDARY MONITOR SWITCH ASSEMBLY HINGE TERTIARY SWITCH TRANSFORMER 1 MECHANICAL LIMITER CAVITY THERMAL CUTOUT CAPILLARY STYLE MAGNETRON 1 COOLING FAN RUN CAPACITORS COOLING FAN PLUGS 13 ...

Page 16: ...OVEN CONSTRUCTION LEFT SIDE MAGNETRON 2 CAPACITOR DIODE ANTENNA MOTOR MAIN CONTROL BOARD FUSE FUSE BLOCK COOLING FANS HINGE 14 ...

Page 17: ...T TUBE ANTENNA CHAMBER EXHAUST AIR DUCT AUTO TRANSFORMER SNUBBER COOLING FAN RELAY CONVECTION FAN MOTOR WIRING HARNESS PLUG INS TRIAC COOLING FAN CAVITY THERMAL CUTOUT MECHANICAL LIMITER RESET BUTTON HV SYSTEM FUSES 2 TRIACS 2 POWER RELAY TRANSFORMER LEFT 15 ...

Page 18: ...OP DOOR INTERLOCK SWITCH TEST PLUGS FRONT OF OVEN MAIN CONTROL BOARD POWER SUPPLY BOARD 24VDC ANTENNA MOTOR GEARS CAPACITOR DIODE MAGNETRON 2 RTD Resistive Thermal Device Aka TEMP SENSOR EXHAUST PLENUM STEAM VENT TUBE 16 ...

Page 19: ...evice aka Temp Sensor Temperature 70 F 23 9C 350 F 176 7 Approximately 1100Ω 1650Ω Fuses F1 BLN 250V 30A F3 F4 250V 12A CLOSED Continuity Magnetron DISCHARGE CAPACITORS Wires Removed Terminal to Terminal Both Terminals to Chassis 1Ω OPEN Motor Antenna Wires Removed Terminal to Terminal Approximately 12 000Ω 12KΩ Motor Convection Blower With Line Voltage Applied ST2 Connector Unplugged ST1 1 to ST1...

Page 20: ...lly OPEN Snubber Transformer Relay Wires Removed Terminal to Terminal Normally OPEN 09µf Switch Primary Use Test Plug By Main Board BU to RD Door Open BU to RD Door Closed Resistance Continuity OPEN NOTE When opening door the Primary Switch should ALWAYS activate first Switches Monitor Secondary Use Test Plug with Door Closed VT to BU Monitor Switch VT to OR Secondary Switch Resistance with Door C...

Page 21: ...T TO REINSTALL AND PROPERLY REPLACE THE DOOR SWITCH ASSEMBLY 1 WITH THE DOOR OPEN SLIDE SWITCH BACK INTO SWITCH BRACKET AND TIGHTEN THE 5 16in 10mm NUT 2 USING AN OHMMETER WITH PROBES INSERTED INTO THE VT AND BU WIRES ON THE SECONDAYR MONITOR SWITCH TEST PLUG ADJUST MONITOR SWITCH TO OPERATE WHEN DOOR IS OPEN TO ONE 1 INCH AT THE TOP OF THE DOOR NOTE TIGHTENING ADJUSTMENT SCREW MAKES INTERLOCK ACT...

Page 22: ...lay 3 Enter in order 1 3 5 7 9 and the Service Mode is initiated If the PIN Code is not enabled it must be enabled in the User s Options With oven on press the blue menu icon at the bottom of the screen 1 Press the blue menu icon and the PIN Code prompt will display 2 Scroll screen to User Options and press it 3 Scroll screen to PIN Code it will say DISABLED underneath and press it 4 Press the rad...

Page 23: ...will display Door Cycles Tube Hours Software Version Displays the version of software and firmware installed in the control Press and the following will display SW EE App Magnetron 1 Right Side System can be started and stopped by pressing the Start or Stop icon The current amperage being drawn by the HV system 5 12amps is considered normal Look for consistent reading with Magnetron 2 and Convecti...

Page 24: ...be started by pressing the Start icon NOTE pressing Stop icon will not stop the antenna motors They continue to run until Service Mode is exited DOES NOT OPERATE ON MRX UNITS Antenna Motors draw very low amperage It is normal to have 0 amps displayed Service provider should visible inspect operation RTD Resistive Thermal Devices aka Temp Sensors Press and the current temperature sensed by the RTD ...

Page 25: ... Replace the Cavity Thermal Cutout NOTE Cutout may trip if subjected to sub freezing temperatures G2 Open Magnetron TCO Board Senses an Open Magnetron TCO Inspect Cooling Fans Operation and Airflow TCO s and Wiring H0 Zero Cross Failure No or Intermittent Voltage at J1 Connector on Main Control Board H2 Invalid System State Main Control Board H3 Invalid EEPROM FLASH Main Control Board I1 Current S...

Page 26: ...starting water temperature from the ending water temperature to obtain the temperature rise If the temperature rise meets or exceeds the nominal microwave energy rating found on the model serial tag the test is complete If the temperature rise 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 temper...

Page 27: ...CONTROL BOARD WIRING 25 ...

Page 28: ...SCHEMATICS DIAGRAMS 26 ...

Page 29: ...16400038 July 2019 ...

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