ACP RFS18TS Manual

Commercial Microwave—Technical Information
October 2013 1 16500024
©2013 ACP, Inc.
208 / 240 V, 60 Hz Models
RFS18TS P2001003M MFS18TS P2001008M
MFS18TSSA P2001009M
•Due to possibility of personal injury or property damage, always contact an authorized technician for servicing or
repair of this unit.
•Refer to Service Manual for installation, operating, testing, troubleshooting, and disassembly instruction.
CAUTION
!
All safety information must be followed as provided in Service Manual.
!
WARNING
To avoid the risk of electrical shock, personal injury or death, disconnect power to oven and discharge capacitor
before servicing, unless testing requires it.
Models RFS18TS MFS18TS MFS18TSSA
Power Source
Voltage AC 208 / 240 VAC 208 / 240 VAC
Amperage (Single Unit) 20 A 20 A
Frequency 60 Hz 60 Hz
Single Phase, 3 wire grounded X X
Receptacle 6-20R BS1363/A
Plug 6-20P BS1363/A
Power Output
Nominal microwave energy (IEC705) 1800 Watts 1800 Watts
Minimum temperature rise (∆T) 18ºF / 7.7ºC 18ºF / 7.7ºC
Operating Frequency 2450 MHz 2450 MHz
Power Consumption
Cook Condition Microwave 3000 Watts / 15.3 Amps 3000 Watts / 13 Amps
Dimensions
Cabinet
Width 21 3/4" 55 cm 21 3/4" 55 cm
Height 14 1/4" 36.2 cm 14 1/4" 36.2 cm
Depth 20 1/4" 51.4 cm 20 1/4" 51.4 cm
Oven Interior
Width 14 1/4" 36.2 cm 14 1/4" 36.2 cm
Height 9" 22.6 cm 9" 22.6 cm
Depth 16 3/8" 41.6 cm 16 3/8" 41.6 cm
Weight
Crated 73 lbs. 33 kg 73 lbs. 33 kg
Uncrated 67 lbs. 30 kg 67 lbs. 30 kg

Component Testing Procedures
!
WARNING
To avoid risk of electrical shock, personal injury or death, disconnect power to oven and discharge capacitor
before servicing, unless testing requires it.
16500024 October 2013
©2013 ACP, Inc.
2
Illustration Component Testing Results
Thermal cutout Disconnect all wires from TCO.
Measure resistance across terminals.
Cavity TCO ...........................................
Magnetron TCO ....................................
Opens at 230°F (110°C)
Closed at 140°F (60°C) and
Opens at 320°F (160°C)
Diode Discharge Capacitor
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: Ohmmeter must contain a
battery of 6 volts minimum.
Capacitor Discharge Capacitor
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
Magnetron Discharge Capacitor
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 28 – 35 Ω
Stirrer motor Remove all wires from motor.
Measure resistance across terminals....
Approximately 12 – 14 KΩ
Filament
Secondary
Primary
Transformer
Discharge Capacitor
Remove all wires from terminals.
Measure resistance from:
Primary................................................
Filament...............................................
Secondary to Ground screw on
transformer stack.................................
Less than <1 Ω
Less than <1 Ω
Approximately 70-80 Ω
Noise filter board Power In terminals ................................
Power Out terminals..............................
240 VAC
240 VAC
If no power in, check power outlet.
If no power out, check fuses.
Circuit Protector Measure resistance across terminals.... Between Terminals: Less than 1
Ω

Component Testing Procedures
!
WARNING
To avoid risk of electrical shock, personal injury or death, disconnect power to oven and discharge capacitor
before servicing, unless testing requires it.
October 2013 16500024
©2013 ACP, Inc.
3
Illustration Component Testing Results
1
2
3
4
5
6
Interlock switch assembly
Primary
Monitor
Secondary
Disconnect wires to switch.
With door open measure resistance from:
Monitor - Terminal 3 - 4 .........................
Primary - Terminal 1 - 2.........................
Secondary - Terminal 5 - 6 ....................
With door closed measure resistance from:
Monitor - Terminal 3 - 4 .........................
Primary - Terminal 1 - 2.........................
Secondary - Terminal 5 - 6 ....................
After verifying or replacing the
module, reconnect wires to switch
and check operation of monitor circuit
before operating the oven.
Indicates continuity
Infinite Ω
Infinite Ω
Infinite Ω
Indicates continuity
Indicates continuity
Lamp receptacle Test continuity of receptacle terminals. Indicates continuity with bulb
installed.
Wire Harness Test continuity of wires Indicates continuity
Electronic Control Panel
Service Test Mode: Open door, Press and Hold pad 3 for 5
seconds to enter service test mode.
Press Pad 1 ................................................
Press Pad 2 ................................................
Press Pad 3 ................................................
Press Pad 4 ................................................
Press Pad 5 ................................................
Press Pad 6 ................................................
Press Pad 7 ................................................
Press Pad 8 ................................................
Press Pad 9 ................................................
Press Pad 0 ................................................
Stop/Reset Pad...........................................
SERVICE appears in the display
Indicates number of hours
magnetron has been turned on
Indicates number of times
magnetron tube has been turned
on and off
Indicates number of door cycles
CLEAR (Press START pad to
reset service data.)
Indicates amperage (Top Mag)
Indicates amperage (Bottom Mag)
RESET (Clear Service Alarm)
N/A
N/A
N/A
Exit Service Test Mode
Error codes: E-08............................................................
E-09............................................................
E-10............................................................
Replace Control Board
Replace Control Board
Shorted or Open Keypad – Test
and replace if necessary

Component Testing Procedures
!
WARNING
To avoid risk of electrical shock, personal injury or death, disconnect power to oven and discharge capacitor
before servicing, unless testing requires it.
16500024 October 2013
©2013 ACP, Inc.
4
Illustration Component Testing Results
Electronic Control
RFS18TS
Keyboard assembly
1
2
3
4
5
6
7
8
9
10
11
Continuity is indicated as
100 Ω and below.
Pad
0
1
2
3
4
5
6
7
8
9
HOLD (0%)
DEFROST (20%)
MEDIUM (50%)
MED-HI (70%)
TIME ENTRY
STOP/RESET
START
Trace
1 & 8
2 & 8
3 & 8
4 & 8
5 & 8
6 & 8
7 & 8
1 & 9
2 & 9
3 & 8
1 & 10
2 & 10
3 & 10
4 & 10
5 & 10
6 & 10
7 & 10
Measurement
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity
Continuity

Component Testing Procedures
!
WARNING
To avoid risk of electrical shock, personal injury or death, disconnect power to oven and discharge capacitor
before servicing, unless testing requires it.
October 2013 16500024
©2013 ACP, Inc.
5
TAB 1
TAB 2
RLY 3
19 3 5 4
8
C 1
N
1
2
Function Test Set-Up /
Condition
Meter
Setting
Probe Placement Results
Power to current
transformer
All Conditions Volts Tab 1 to CN1 Pin 3 208 / 240 VAC
Power from current
transformer
All Conditions Volts Tab 2 to CN1 Pin 3 208 / 240 VAC
Power from Oven TCO All Conditions Volts CN1 – Pin 1 (Black wire to ground) 208 / 240 VAC
Power to Oven Light Standby .............
Ready................
Cook..................
Volts
Volts
Volts
CN1 – Pin 4 to Pin 1..............................
CN1 – Pin 4 to Pin 1..............................
CN1 – Pin 4 to Pin 1..............................
208 / 240 VAC
0 VAC
0 VAC
Power to Blower Motor Standby .............
Ready................
Cook..................
Volts
Volts
Volts
CN1 – Pin 5 to Pin 1..............................
CN1 – Pin 5 to Pin 1..............................
CN1 – Pin 5 to Pin 1..............................
208 / 240 VAC
0 VAC
0 VAC
Secondary Interlock
Switch
Door Closed ......
Door Opened.....
Ohms
Ohms
CN1 – Pin 8 to Pin 9..............................
CN1 – Pin 8 to Pin 9..............................
Continuity
Infinite
Power to Relay 3 Standby .............
Ready................
Cook..................
Volts
Volts
Volts
Relay 3 – Pin 1 to Pin 2.........................
Relay 3 – Pin 1 to Pin 2.........................
Relay 3 – Pin 1 to Pin 2.........................
208 / 240 VAC
208 / 240 VAC
0 VAC

Component Testing Procedures
!
WARNING
To avoid risk of electrical shock, personal injury or death, disconnect power to oven and discharge capacitor
before servicing, unless testing requires it.
16500024 October 2013
©2013 ACP, Inc.
6
All Amana and Menumaster microwave oven power outputs are rated using the IEC705 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.
•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 procedures 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.
5. At end of the cycle, remove test container. Using the thermometer, stir water for five to ten seconds and record
temperature (T2).
6. Subtract the starting water temperature (T1), from the ending water temperature (T2) to obtain the temperature
rise (∆T).
7. 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.
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

Wiring and Schematic Diagrams
!
WARNING
To avoid risk of electrical shock, personal injury or death, disconnect power to oven and discharge capacitor
before servicing, unless testing requires it.
October 2013 16500024
©2013 ACP, Inc.
7
L1
L2
BL
GN
1345
BN
89
WH
PK
BK
BK
BN
(C)
(NC)
AC 208/220-240V/60Hz
SINGLE PHASE ONLY
OVEN LIGHT
SM
TOP STIRRER
MOTOR
OL
SM
NOISE FILTER ASSEMBLY
TOP INTERLOCK
MONITOR SWITCH
TOP PRIMARY
INTERLOCK
SWITCH
SECONDARY
INTERLOCK
SWITCH
(CN1)
MAIN PCB
CURRENT
TRANSFORMER
POWER
TRANSFORMER
RY 7
RY1
230V
NOTE:
1.DOOR IS OPENED.
2.WIRE COLOR
SYMBOL COLOR
BLACK
BROWN
BLUE
GREEN
PINK
RED
WHITE
YELLOW
BK
BN
BL
GN
PK
RD
WH
YL
YL
FUSE
BM
OVEN TCO
MOTOR
BLOWER
BTM STIRRER
MOTOR
BTM PRIMARY
INTERLOCK
SWITCH
BTM INTERLOCK
MONITOR SWITCH
TOP MAGNETRON
SEE HV CIRCUIT
BTM MAGNETRON
SEE HV CIRCUIT
MAGNETRON
H.V.
CAPACITOR
H.V.DIODE
CHOKE FILTER
HV CIRCUIT (2 PLACES)
RD
WH
BL
WH
BK
BL
BK
BK
WH
BK
RD
WH
BN
GN
BK
(C)
(NC)
BN
208
230
208
230
OVEN LIGHT
OL
6
COM
208
BK
WH
RY2
208V
TAB1
TAB2
BL
BL
RD
RY4
208V
RY3
230V
RY6
208V
RY5
230V
RD
230
COM
COM
BN
BTM MGT
TCO
TOP MGT
TCO
BK
AUTO
VOLTAGE
DETECTION
V/S RELAY 1
H.V.
FUSE
WH
WH
WH
WH
BK
BK
RY11
RY10
BK
BL
WH
WH
TAB5
TAB4
TAB3
RD
TAB8
TAB7
TAB6
BN
WH
V/S RELAY 2
DANGER
!
HIGH VOLTAGE