ACP MRX2SW User manual

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.

TABLE OF CONTENTS
IMPORTANT SAFETYINFORMATION…………………………………………………….1
Specifications..................................................................................................................5
Installation………………………………………………………………………………………6
Quick Start Reference Guide…………………………………………………………….......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

IMPORTANT SAFETY INSTRUCTIONS
Important Notices for Servicers and Consumers
ACP will not be responsible for personal injury or property damage from improper service
procedures. Pride and workmanshipgointoeveryproducttoprovideourcustomerswithquality
products. Itispossible,however,thatduring itslifetimeaproductmayrequireservice. Products
shouldbeservicedonlybyaqualifiedservicetechnicianwhois familiarwiththesafetyprocedures
requiredintherepairandwhoisequippedwiththepropertools,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
TelephoneNumber
WWW.ACPSOLUTIONS.COM 1-866-811-8559 or 319-368-8195
E-Mail: [e-mail]
Recognize Safety Symbols, Words, and Labels
DANGER— Immediate hazards which WILL result in severe personal injury or death.
WARNING— Hazards or unsafe practices which COULD result in severe personal injury or death.
CAUTION— Hazards or unsafe practices which COULD result in minor personal injury, product or property
damage.
!
!
1

!
WARNING
Read the following information to avoid possible exposure to microwave radiation:
The basic design of the Microwave Oven makes it an inherently safe device to both use and service.
However,therearesomeprecautionswhichshouldbefollowedwhenservicingthemicrowavetomaintainthis
safety. Theseareasfollows:
1. Always operate the unit from an adequately
groundedoutlet. Donotoperateonatwo-wire
extension cord.
2. Beforeservicingtheunit(ifunitisoperable)perform
the microwave leakage test.
3. Theovenshouldneverbeoperatedifthedoordoes
notfitproperlyagainsttheseal,thehingesorhinge
bearings are damaged or broken; the choke is
damaged, (pieces missing, etc.); or any other
visible damage can be noted. Check the choke
areatoensurethatthisareaiscleanandfreeofall
foreign matter.
4. If the oven operates with the door open and
producesmicrowaveenergy,takethefollowing
steps:
A. Telltheusernottooperatetheoven.
B. Contact ACP ComServ immediately.
5. Alwayshavetheovendisconnectedwhentheouter
case is removed except when making the "live"
tests called for in the Service Manual. Do not
reach into the equipment area while the unit is
energized. Makeallconnectionsforthetestand
checkthemfortightnessbeforepluggingthecord
into the outlet.
6. Alwaysgroundthecapacitorsonthemagnetron
filter box with an insulated-handle screwdriver
before working in the high voltage area of the
equipmentcompartment. Sometypesoffailures
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
interlock switchesthereisnotvalidreason
forthisaction atanytime;norwillitbe
condonedbyACP.
9. IMPORTANT: Before returning a unit to a
customer,besuretocheckforproperswitch
interlock action.
10. The MicrowaveOvenshouldneverbe
operatedwithanycomponentsremovedand/or
bypassedorwhenanyofthesafetyinterlocksare
found to be defective, or when any of the seal
surfacesaredefective,missing,ordamaged.
11. All microwaveovensmeetallrequirements
oftheradiationcontrolforHealthandSafetyActof
1968. Due to measurement uncertainties, the
maximumleakageforthefieldwillbe4mw/cm2.
12. Toensure that the unit does not emit excessive
microwaveleakageandtomeettheDepartment
ofHealthandHumanServicesguidelines,check
theovenformicrowaveleakageusingamicrowave
oven leakage meter that complies with US
GovernmentCDRH/FDA/DHHSrequirements
andoranyotherlocalgovernmentrequirements.
Themaximumleakagelevelallowed by ACP
is4mw/cm
2.
13. Ifservicerencountersanemissionreadingover
4mw/cm2,theserviceristoceaserepairand
contact the ACP ComServ Department
immediatelyforfurtherdirection.ACP
will contact the proper Government
Agencyuponverificationofthetestresults.
2

Recognize this symbol as a SAFETY message
!WARNING
When using electrical equipment, basic safety precautions should be followed to reduce the risk of burns,
electrical shock, fire, or injury to persons including the following.
1. READ all instructions before usingequipment.
2. READ AND FOLLOW the specific
“PRECAUTIONS TO AVOID POSSIBLE
EXPOSURE TO EXCESSIVE MICROWAVE
ENERGY” on this page.
3. This equipment MUST BE GROUNDED. Connect
only to properlyGROUNDED outlet. See
“GROUNDING / EARTHING INSTRUCTIONS”
on page 5.
4. Install or locate this equipment ONLY in
accordance with the installation instructionsin
this manual.
5. Some products such as whole eggs and sealed
containers—for example, closed glass jars—are
able to explode and SHOULD NOT be HEATED
in this oven.
6. Use this equipment ONLY for its intended useas
described in this manual. Do not use corrosive
chemicals or vapors in this equipment. This type
of oven is specifically designed to heat,cook,
or dry food. It is not designed for industrial or
laboratory use.
7. As with any equipment, CLOSESUPERVISION
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 avoidburns.
11. DO NOT operate this equipment if it has a
damaged cord or plug, if it is not working properly,
or if it has been damaged or dropped.
12. This equipment, including power cord, must be
serviced ONLY by qualified service personnel.
Special tools are required to service equipment.
Contact nearest authorized service facility for
examination, repair, oradjustment.
13. DO NOT cover or block louvers or otheropenings
on equipment.
14. DO NOT store this equipment outdoors. DO NOT
use this product near water –for example, near a
kitchen sink, in a wet basement, a swimmingpool,
or a similar location.
15. DO NOT immerse cord or plug in water.
16. Keep cord AWAYfrom HEATED surfaces.
17. DO NOT let cord hang over edge of tableor
counter.
18. For commercial use only.
SAVE THESE INSTRUCTIONS
3

To avoid personal injury or property damage, observe the following:
1. Do not deep fat fry in oven. Fat couldoverheat
and be hazardous tohandle.
2. 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.
3. Pierce skin of potatoes, tomatoes, and similar
foods before cooking with microwave energy.
When skin is pierced, steam escapesevenly.
4. Do not operate equipment without load orfood
in oven cavity.
5. Microwave popcorn should not be poppedin
oven.
6. Do not use regular cooking thermometers in
oven. Most cooking thermometers contain
mercury and may cause an electrical arc,
malfunction, or damage tooven.
7. Do not use metal utensils inoven.
8. Do not use aluminum foil inoven
9. Never use paper, plastic, or other combustible
materials that are not intended forcooking.
10. When cooking with paper, plastic, or other
combustible materials, follow manufacturer’s
recommendations on productuse.
11. Do not use paper towels which contain nylonor
other synthetic fibers. Heated synthetics could
melt and cause paper to ignite.
12. 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 beforeheating.
13. Toavoid pacemaker malfunction, consult
physician or pacemaker manufacturerabout
effects of microwave energy on pacemaker.
14. An authorized servicer MUST inspectequipment
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
cooking.
b. Remove wire twist-ties from paper or plastic
bags before placing bag inoven.
c. If materials inside the oven ignite, keep oven
door CLOSED, turn oven off and disconnect
the power cord, or shut off power at the fuse
or circuit breaker panel.
d. DO NOT use the cavity for storage. DO NOT
leave paper products, cooking utensils, or food
in the cavity when not in use.
WARNING
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:
i) Do not overheat theliquid.
ii) Stir the liquid both before and halfway through
heating it.
iii) Do not use straight-sided containers with narrow
necks.
iv) After heating, allow the container to stand in the
microwave oven for a short time before removing
the container.
v) Use extreme care when inserting a spoon or
other utensil into thecontainer.
!
CAUTION
4

SPECIFICATIONS
Power Source Voltage
208/240 VAC
30A, Single Phase, 3 Wire
Grounded
Automatic Voltage Sensing
Yes
Plug Configuration
NEMA
6-30
Power Consumption
5650W, 28.4A
Convection Heater Only
3070W
Power Output –Microwave (IEC705)
2000W
Minimum Temperature 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/72kg
Stackable
Yes, with optional
stacking cart
5

INSTALLATION
STEP 1 - Unpack Oven
A. Inspect oven for damage such as dents in door or inside ovencavity.
B. Report any dents or breakage to source of purchaseimmediately.
Do not attempt to use oven if damaged.
C. Remove all packing materials from oveninterior.
D. If oven has been stored in extremely cold area, wait a few hours before
connecting power.
STEP 2 - Place Oven on Counter
E. Recommended countertop surface depth is 28in (72 cm).
F. Do not install oven next to or above source of heat, such as a pizza
oven, grill, or deep fat fryer. This could cause oven to operate
improperly and could shorten the life of electrical parts due to
excessive heat and/or grease.
G. Do not block or obstruct 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 proper convection air flow.
K. DO NOT cook food directly on floor ofoven.
6
A. Allow at least 2in (5.1cm) of clearance around top
of oven. Proper air flow around oven cools
electrical components. With restricted air flow,
oven may not operate properly and life of electrical
parts is reduced.
B. Do not remove back panel bumpers. They ensure
proper clearance.
C. Allow at least 1in (2.54cm) of clearance around
sides of oven.
D. Install oven so oven bottom is at least 3 feet
(91.5cm) above the floor.

\
7
7

8

FIRMWARE UPDATE PROCEDURE
The Touch Control is designed to be updated as future technology and programming requirements change.
Should new firmware be required follow the steps below. Firmware updates are made available at:
http://acpsolutions.com/oven-programming/
1. Ensure the oven is powered on.
2. If the standby (off) screen is showing, press the green power button.
3. Press the blue menu button.
4. If the PIN is enabled, enter 1‐3‐5‐7‐9 to access service mode.
If the PIN is not enabled the menu will appear.
- Touch and drag up to scroll to the bottom of the menu and select “User Options”.
- Touch and drag up to scroll down through the user options and select “PIN Code”.
- Select On, enter and remember a 4 digit Pin Code and then select the home button.
- Now press the blue menu button and enter 1‐3‐5‐7‐9 to access service mode.
5. Ensure the software version displayed is less than the version being installed, then 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. The screen will blink, then a few seconds later the Startup logo will appear. Underneath will appear
the word “Updating” along with a progress bar. Continue to wait. Note: Do not remove the USB/flash
drive
until AFTER the reboot is completed.
11. After about two minutes the words “Update Complete” will appear and a green “Reboot” button will
appear. Do not remove the USB/flash drive. Press the green button.
12. Once the ACP logo and green power button appear, remove the flash drive and press the green power
button.
13. Press the blue menu button and enter 1‐3‐5‐7‐9 to access service mode.
14. Verify the software version displayed is new version.
15. Press the home button.
16. The firmware update is complete.
10
9

CARE AND CLEANING
10

OVEN CONSTRUCTION –CAVITY
TOP FORCED-AIR PLATE
4 SCREWS TO REMOVE
COOKING PLATE
(MUST BE IN PLACE. ALLOWS
AIR FLOW UNDER FOOD)
11

OVEN CONSTRUCTION –ANTENNA BOX
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

OVEN CONSTRUCTION –RIGHT SIDE
*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

OVEN CONSTRUCTION –LEFT SIDE
MAGNETRON 2
CAPACITOR
& DIODE
ANTENNA MOTOR
MAIN CONTROL
BOARD
FUSE & FUSE BLOCK
COOLING FANS
HINGE
14

OVEN CONSTRUCTION –BACK
MAGNETRON 1 (RIGHT)
CAVITY STEAM VENT 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

OVEN CONSTRUCTION –TOP
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

Illustration Component Test Results
Auto Transformer
230 to 0 (Com)……………………….....
208 to 0 ………………………………...….
120 to 0 (not used)……………….…...
Approximately:
38 Ω
35 Ω
25 Ω
Capacitor, Cooling Fan
Motor
Wire to Wire 1.5µf ± 5% 400V 50/60hz
Capacitor, High Voltage Terminal to Terminal .88µf ± 3% 2100V 50/60hz
Control Board, Main See Service Test Mode Section
Control Board, Touch
Screen Display
See Service Test Mode Section
Convection RTD
(Resistive Thermal
Device) 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 ST1-2……………………………
Motor not running with line voltage
present indicates a failed motor
assembly.
Motor, Cooling Fan
Wires Removed:
BU to BRN………………………………….…
BU to BK……………………………….……..
BK to BRN…………………………….………
Approximately:
200Ω
685Ω
900Ω
COMPONENT TESTING PROCEDURES

Illustration Component Test Results
Power Supply Board
With Line Voltage Applied:
J1-1 (WH) to J1-3 (BK) …………………
J2-1 (RD) to J2-5,6,&7…………………
Line Voltage AC
Approximately 24VDC
Power Transformer
DISCHARGE CAPACITORS!
Wires Removed:
COM to 208 or 230……………...……..
5 to 6………………………………...………..
4 to Chassis Ground……………………
Resistance:
<2Ω (Open to Ground)
<1Ω (Open to Ground)
Approximately 62.5Ω ± 5%
Rectifier (Diode)
DISCHARGE CAPACITORS!
Diode Removed from Capacitor
OPEN (∞) when measured in one
direction, 50KΩ or more in the
other direction. NOTE: Meter must
have >6VDC Battery to effectively
measure
Relay, Fan (24VDC)
Wires Removed:
BK to RD 3/16" Terminals…………….
BK (1/4") to YL Terminal……………….
BK to BU Terminals………………………
Resistance:
Approximately 550Ω (Solenoid)
Normally Closed - Continutity
Normally Open - OPEN (∞)
Relay, Power
(208/230VAC)
Wires Removed:
0 to 1……………………………………..…...
2 to 4 ………………………………………....
6 to 8 ………………………………………….
Resistance:
Approximately 550Ω (Solenoid)
Normally OPEN (∞)
Normally 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 Closed:
OPEN (∞)
Continuity
NOTE: When opening door, the
Primary Switch should ALWAYS
activate first.
Thermal Cutout (TCO),
Cavity
Wires Removed (one set is used):
11 to 12………………………...……….....
21 to 22 ………………………………...….
31 to 32……………….……………….…...
With Mechanical Reset Button "in":
Continuity at Temperatures
Between 608°F (320C) and 32°F (0C)
Thermal Cutout (TCO),
Magnetron
Wires Removed:
Terminal to Terminal…………………..
Opens at 300°F (320C). Resets at
257°F (125C)
Triac (Fan, Heater, &
Transformer)
Wires Removed:
MT1 to Gate Approximately 50Ω
MT1 to MT2 - OPEN (∞)
MT2 to Gate - OPEN
All Terminals OPEN (∞) to Ground
Convection Heater
Wires Removed:
Terminal to Terminal…………………..
Resistance:
Approximately 15Ω
COMPONENT TESTING PROCEDURES