Jenn-Air JMW8530, JJW8627, JJW9630, W3040OP, WW30110 User Manual
...
Jenn-Air
ElectricWall Oven
ServiceManual
16009721
Issued7/99
SAFETY PRECAUTIONS
This service information is intended to be used by a qualified service technician who is famil-
iar with proper and safe procedures to be followed when repairing any electrical appliance.
All tests and repairs should be performed by a qualified service technician who is equipped
with proper tools and measuring devices. All replacements should be made by a qualified
service technician using only Maytag Appliances Sales Company replacement parts.
Improper assembly or adjustment may occur if service or repair is attempted by persons
other than qualified service technicians or if parts other than Maytag Appliances Sales Com-
pany replacement parts are used. Improper assembly or adjustment can cause hazardous
conditions.
There can be risk of injury or electrical shock while performing services or repairs. Injury or
electric shock can be serious or even fatal.
16009721 _:_mety
O1999 Msytag Appliances Sales Company
INTRODUCTION
The manual is printed in a loose format and is divided into sections relating to a general group
of components and/or service procedures. Each section is further subdivided to describe a
particular component or service procedure.
The subdividing of the subject matter, plus the loose leaf form, will facilitate the updating of
the manual as new or revised components are added or new models are introduced.
Each page of the manual will be identified in the lower, right-hand corner, and as new or
revised pages are published, the manual can easily be updated by following the filing
instructions on the cover letter of the supplement.
This service manual is a valuable tool and care should be taken to keep it up-to-date by prompt
and proper filing of subsequent pages as they are used.
MODELS COVERED IN THIS MANUAL:
W2451 WM27260
W27100 WM27460
W27200 WM30460
W27400 JJW8527
W30100 JJW8530
W30400 JJW8627
W3040OP JJW8630
WW2460 JJW9527
WW27110 JJW9530
WW27210 JJW9627
WW27430 JJW9630
WW27430P JMW8527
WW30110 JMW8530
WW30430 JMW9527
WW30430P JMW9530
WM27160
16009721 Introduction i
01999 Maytag Appliances Sales Company
NOTES
16009721 Introduction ii
@1999 Maytag Appliances Sales Company
CONTENTS
GENERAL SAFETY PRECAUTIONS ................................................................................................... i
INTRODUCTION ................................................................................................................................. ii
CONTENTS ........................................................................................................................................ iv
SECTION 1. COMPONENT DESCRIPTION ................................................................................... 1-1
MEAT PROBE ......................................................................................................................... 1-1
MEMBRANE SWITCH ........................................................................................................... 1-1
ELECTRIC CONTROL ............................................................................................................. 1-1
TOUCH SENSOR TECHNOLOGY ......................................................................................... 1-1
DISPLAY BOARD ................................................................................................................... 1-1
POWER RELAY BOARD ........................................................................................................ 1-1
OVEN SENSOR ...................................................................................................................... 1-1
FAULT CODES ........................................................................................................................ 1-2
SECTION 2. COMPONENT ACCESS .......................................................................................... 2-1
CONTROL PANEL ASSEMBLY .................................................................................................. 2-1
OVEN DOOR REMOVAL ............................................................................................................ 2-1
SERVICING OVEN DOOR ........................................................................................................... 2-1
OVEN DOOR-HINGE REPLACEMENT ...................................................................................... 2-2
COOLING FAN ACCESS ............................................................................................................. 2-2
OVEN CAVITY COMPONENTS .................................................................................................. 2-2
Oven Sensor Removal .......................................................................................................... 2-2
Bake Element Removal ......................................................................................................... 2-2
Broil Element Removal ......................................................................................................... 2-2
Oven Light .............................................................................................................................. 2-3
Convection Motor Assembly ............................................................................................... 2-3
OVEN VENT/SMOKE ELIMINATOR .......................................................................................... 2-3
OVEN CAVITY ............................................................................................................................. 2-3
OVEN HINGE POCKETS ............................................................................................................. 2-3
SECTION 3. TROUBLESHOOTING ............................................................................................. 3-1
ELECTRONIC OVEN CONTROL: ............................................................................................... 3-1
TROUBLESHOOTING ................................................................................................................. 3-5
MULTIPLEXING CIRCUITRY ....................................................................................................... '3-8
POWER RELAY BOARD CONNECTION ................................................................................... 3-9
DISPLAY BOARD CONNECTIONS .......................................................................................... 3-10
CIRCUIT BOARD CONNECTIONS ........................................................................................... 3-10
MEMBRANE CONNECTIONS .................................................................................................. 3-11
SECTION 4. WIRING DIAGRAM ................................................................................................. 4-1
W2451 .......................................................................................................................................... 4-I
W27100 ........................................................................................................................................ 4-3
W27200, W30100, WM27160, WM27260 .................................................................................. 4-4
W27400, W30400, W30400P, WM27460, WM30460 ................................................................. 4-6
WW2460 ....................................................................................................................................... 4-7
WW27110, WW30110 ................................................................................................................. 4-8
WW27210 ................................ _.................................................................................................... 4-9
WW27430, W27430P, WW30430, WW30430P ........................................................................ 4-11
16009721 Contents iii
©1999 Maytag Appliances Sales Company
CONTENTS CONT.
JJW8527, JJW8530, JJW9527, JJW9530, ................................................................................. 4-13
JMW8530, JMW8527, JMW9527, JMW9530 ............................................................................ 4-13
JJW8627, JJW8630, JJW9627, JJW9630 .................................................................................. 4-15
JJW8530, JJW9530 - Canadian Models .................................................................................... 4-17
16009721 Contents iv
@1999M0,/tagAppliancesSalesCompany
SECTION 1. COMPONENT DESCRIPTION
COMPONENTS
Meat Probe: Senses the internal tempera-
ture of products during a baking function.
The meat probe is an NTC, or negative
temperature coefficient, which means the
resistance value decreases as the tempera-
ture increases. See meat probe chart below
for resistance values.
MEAT PROBE
Type: Calibration:
NTC Thermistor 9938 ohms (150°F.)
PROBE RESISTANCE VS. TEMR TABLE
Degrees E Resistance
122 18963 ohms
150 9938 ohms
156.2 8846 ohms
165.2 7456 ohms
210.1 3886 ohms
Membrane Switch: The means to make a
switch contact, thus instructing the elec-
tronic control system to perform a desired
function. The membrane switch is a simple
set of two contact surfaces containing
conductive material, one on the back layer
of MYLAR and the other on the front layer
of MYLAR. There is also a center section of
non-conductive MYLAR material that has a
hole punched out of it at each switch con-
tact position. The thickness of this spacer
MYLAR determines the push force required
to close the contacts between the front
contact strip and the rear contact strip.
Typically, the push force required to close a
contact is 12 to 18 ounces.
Electronic Control: A programmable soft-
ware component that controls oven, clock,
timer and various other functions. The
control maintains oven temperatures in
either bake, broil, or clean. It is adjustable to
maintain correct temperature offsets. It is
also programmed with self-monitoring
circuitry, which determines if a potential
unsafe condition is present, shuts the sys-
tem down and displays the appropriate fault
code. Fault codes are covered in product
specifications sections 3 and 4.
Touch Sensor Technology: With this new
technology a positive charge and negative
charge is present around each pad. This
creates an electrostatic field that emanates
around, below, and through the glass front.
When the consumer touches a key pad, this
disturbs the electrostatic field and draws
capacitance energy. This input is read by
the module, which in turn signals the con-
troller to respond, and the desired function
is performed. In order for a function to be
performed, a conductive material must
bridge the gap between the negative charge
present at each pad.
Display Board: Displays time-of-day clock,
oven temperatures, and any other function
programmed into the electronic control
system. The display board also acts as the
input means from the membrane switch
and sends those commands to the power
relay board to process, implement, and
monitor.
Power Relay Board: Contains the intelli-
gence in the electronic control system and
controls all oven functions, clock, timer, ,and
various other consumer programmable
inputs. The PRB has a relay mounted to it
for each function it provides.
Oven Sensor: A device to monitor internal
oven temperature. The sensor has a PTC or
positive temperature coefficient, or a resis-
tance value that increases with temperature.
Allows the electronic control to maintain a
temperature setting through means of
resistance matching with the control-se-
lected temperature. Example: The oven
control is set at 350°F, the oven sensor
resistance at room temperature is approxi-
mately 1060 ohms. As the oven heats, the
16009721 COMPONENT DESCRIPTION 1-1
_1999 Maytag Appliances Sales Company
resistance of the sensor increases. The
resistance of the sensor at 350°F is approxi-
mately 1654 ohms. The electronic control
monitors the resistance value of the sensor
and cycles the oven heating elements off.
As the temperature in the oven decreases,
the resistance of the sensor decreases. At a
predetermined temperature setting, the
electronic control will initiate another heat-
ing cycle in the oven elements. See oven
sensor chart at right for resistance values.
OVEN SENSOR
Sensor Type: Calibration:
RTD 1000 ohm platinum 1654 ohms (350°E)
OVEN SENSOR RESISTANCE VS. TEMP. TABLE
Degrees E Resistance
100 1143 ohms
200 1350 ohms
300 1553 ohms
350 1654 ohms
400 1753 ohms
500 1949 ohms
600 2142 ohms
700 2331 ohms
800 "2516 ohms
900 2697 ohms
1000 2874 ohms
FAULT CODES
There are built-in fault codes to assist the technician in diagnosis of the control system. Any
time the control senses an error in the system, the control will beep at s 1 second interval
until the ON/OFF key is pressed.
_u_
CODES
F1
F3
F9
PROBLEM
Oven Temperature
Shorted Key, Keyboard
Disconnected
Sensor Failure or Sensor
Circuit Failure
Door Code
Ohm Test Sensor. Check connection at Sensor Wire
Harness
Check control. If keyboard is not disconnected (F1-4) or
key is not shorted (F1-3), replace control.
Ohm sensor. See chart,
Check Latch Assembly
COMPONENTS TO CHECK
For Models:
WW27110, WW30110, WM27160 (Oven Sensor Chart: Please refer to chart on 1-3)
16009721 COMPONENT DESCRIPTION 1-2
O199g Maytag Appliances Sales Company
FAULT
CODES
PROBLEM COMPONENTS TO CHECK
F1
F2 Over temperature sensed Ohm TEST SENSOR. If checks ok, change control.
F3 Open sensor. Ohm sensor.
F4 Shorted sensor. Ohm sensor.
F5 Over temperature Ohm sensor. Check connection of sensor wire harness.
F7 Shorted key Stuck Function Key on control.
F9 Door Code Check LatchAssembly.
For Models:
W27100, W27200, W30100, WW27210, WM27260 (Oven Sensor Chart: Please refer to chart below)
MEAT PROBE:
TYPE:
CALIBRATION:
Power to element relay activated J1, J2 wire harness connection to control shorted. If
during time of day display, checks ok, change control.
OVEN SENSOR:
NTC thermistor
9938 ohms (150 F)
SENSOR TYPE:
CALIBRATION:
RTD 1000 ohm platinum
1654 ohms (350 F)
PROBE RESISTANCE VS TEMR TABLE
DEGREES F RESISTANCE
122 18963 ohms
150 9938
156.2 8846
165.2 7456
210.1 3886
For Models:
W27400, W30400, W30400RWW27430, WW27430RWW30430, WW30430RWM27460,
WM30460, JJW8527, JJW85300 JJW86270 JJW8630, JJW9527, JJW9530, JJW9627, JJW9630,
JMW8527, JMW8530, JMW9527, JMW9530
OVEN SENSOR RESISTANCE VS TEMR TABLE
DEGREES F RESISTANCE
100 1143 ohms
200 1350
300 1553
350 1654
400 1753
500 1949
600 2142
700 2331
800 2516
900 2697
1000 2874
16009721 COMPONENT DESCRIPTION 1-3
©1999 Maytag Appliances Sales Company
FAULT
CODES PROBLEMS COMPONENTS TO CHECK
J2 harness shorted. If checks
POWER TO ELEMENT RELAY ENERGIZED ok, change (PRB) power relay
F1 DURING TIME OF DAY DISPLAY. board. Note: For double oven
only, change second oven
board.
Over temperature sensed; over 620
F2 sensed by control in time of day mode, Ohm sensor. If checks ok,
bake mode, or over 950 sensed in clean change power relay board.
mode. "See chart for sensor value."
F3 Cooling fan on with no oven function Ohm sensor, wire harness to
selected, sensor.
F4 Shorted oven sensor Ohm sensor, wire harness to
sensor,
F5 Power element relays disabled in cook 1) Intermittent sensor or wire
mode. harness connection.
2) Intermittent contact on PRB.
F7 Shorted key sensed for 32 seconds 1) Membrane shorted
2) Display Board
1) Probe jack or harness to
F8 Shorted meat probe alarm, probe jack.
2) Probe sensing temp.
Above 250 F. "See chart."
F9 Door lock safety circuit on power relay
board sensed. PRB
FF Invalid temp. Reading on PRB. Check sensor and harness,
PRB.
J2 harness, ohm wires end to
F- Communication error between boards, end. Harness ok, replace
display board.
FC Communication error between boards. J2 harness, ok, replace PRB.
DOUBLE OVEN ONLY
1) Check sensor and harness.
I F2 I Second oven error sensed,
2) Replace second oven
board.
16009721 COMPONENT DESCRIPTION 1-4
01999 Maytag Appliances Sales Company
SECTION 2. COMPONENT ACCESS
The following are instructions to access,
repair and replace components of the slide-in
range.
The unit is more accessible if it is removed
from the installed position before servicing
procedures begin.
-- IMPORTANT
DISCONNECT FROM POWER SOURCE [
BEFORE SERVICING APPLIANCE.
I
I
CONTROL PANEL ASSEMBLY
Electrical components can be accessed by
removing the control panel.
To remove the control panel, open the oven 4.
door as wide as possible. Remove the three
screws from the top of the control panel and
the three screws at the bottom of the con-
trol panel. Grasp the control panel by 5.
placing hands on the right and left sides of
the panel, pull out and down to disengage.
OVEN DOOR REMOVAL
.
Open the oven
door as wide as
possible.
,
Place an 1/8"
pin in the hole
on the right and
left door hinges,
see Figure 2-1,
.
Remove the
screws from
each side with a
PhiLlips screw-
driver. Remove
the lock plate
from each side,
Raise the oven door up to a broil stop
position. In this position, it will be
against the 1/8" pin.
Grasp the door toward the top on both
sides. Lift the door up and out to re-
move.
Figure 2-1
For JJW Models:
1. To remove the control panel, open the
door as wide as possible. Remove the
four screws from the bottom of the
control panel. Grasp the control panel
by placing hands on the right and left
sides of the panel, lift up and out to
disengage from upper flange.
2. Place the panel on the top oven rack
(cover with a cloth to prevent scratch-
ing) for component testing.
3. With the control panel pulled forward,
access is now available to the following
components: Control Assembly, Clock,
High Limit Thermostat, Cooling Fan,
Door Latch Mechanism and Motor.
16009721 COMPONENT ACCESS 2-1
©1999 Maytag Appliances Sales Company
SERVICING OVEN DOOR
1. Lay the oven door on a protected surface
with the inner door panel facing down.
2. Remove three screws from lower trim.
Remove trim piece.
3. Slide outer-door glass down to disen-
gage from top trim. Remove.
4. Remove three screws from top oven
door trim. Remove the two 3/8" nuts
from the door handle bracket.
5. Lift up and off. This will disengage the
side trim as well.
6. Remove the oven window pack by re-
moving the 3/8" nuts from the insulation
retainer.
For JJW Models:
1. Lay oven door on a protected surface
with the inner door panel facing down.
2. Remove the three screws at the top and
the three at the bottom of the door, see
Figure 2-2,
3. Grasp the door assembly at the bottom
and lift the assembly off the front door
glass.
3. To reassemble the oven door, reverse the
procedures for disassembling.
COOLING FAN ACCESS
To access the cooling fan, remove two 1/4"
hex screws from the bracket which the fan is
mounted on. Tilt motor and bracket to
allow it to pass through main back panel.
OVEN CAVITY COMPONENTS
4. Remove the two center screws holding
the center bracket in position.
Figure 2-2
5. Once the center bracket is removed you
will see two screws securing the trim to
the glass. Remove these screws.
6. Remove the two screws holding the left
and right side brackets inposition.
7. Slide the front door glass out of the
frame.
Oven cavity components consist of: bake
and broil elements, oven light assembly,
convection motor, oven cavity, and oven
sensor,
Oven Sensor Removal
Remove two 1/4" hex screws, pull oven
sensor into oven cavity to gain access to the
electrical quick connector.
To reassemble, use a probe and attach the
probe to the quick connector, Guide it
through the insulation to ensure the connec-
tor does not contact the oven cavity. Contact
could damage the connector.
Return to the original position, reattaching
with the 1/4" hex screws.
Bake Element Removal
Remove the two 1/4" screws. Pull the bake
element into the oven cavity to access
electrical wiring.
8. Reverse the procedure to reassemble.
OVEN DOOR HINGE REPLACEMENT
Broil Element Removal
Remove the four 1/4" hex screws. Pull broil
element into oven cavity to gain access to
1. Remove two screws from oven inner
door panel that mount into the lower
portion of oven door hinge assembly.
the electric wiring. Reattach by returning to
the original position and fastening with four
hex screws.
2. Grasp and liftoven door hinge assembly
upward and slide down to disengage
upper tabs from the door panel.
16009721 COMPONENT ACCESS 2-2
©1999 Maytag Appliances Sales Company
Oven Light
Bulb can be replaced or accessed by turning
the lens counterclockwise to remove the
entire oven light. The socket can be removed
by depressing the spring clips from the rear
of the light socket end pushing it into the
oven cavity.
3. Grasp the front flange of the oven liner
and gently pull forward to remove oven
liner from insulation and structure.
NOTE: When replacing oven cavity, use
pieces of sheet metal on sides and top of
oven liner to allow cavity installation
without tearing or removing insulation.
A new oven light socket can be inserted and
snapped into position by depressing the
spring clips and reattaching in the original
position.
Convection Motor Assembly
To access the motor assembly, remove the
three 1/4" hex screws from the convect
cover. Remove the cover. Remove three
additional 1/4" hex screws that secure the
convect motor assembly. Pull convect
motor assembly into the oven cavity, dis-
connecting the electricat quick-connect.
Reattach by returning to original position
using reverse procedures.
OVEN VENT/SMOKE ELIMINATOR
, Remove oven vent and smoke eliminator
by using tabs on bottom of smoke elimi-
nator, turning counterclockwise to disen-
gage the locking ears from the inner
insulation retainer.
When the cavity is within two inches of
being in place, remove the sheet metal.
OVEN HINGE POCKETS
,
Remove oven door following the steps
previously described in section on Oven
Door Removal.
.
Remove hex screws from the lower front
closure.
3. From each side of the range, remove two
1/4" hex screws.
4. Replace components and reassemble.
2. To remove the smoke eliminator, pull
down end align locking ears with notches
in oven cavity.
Reattach by reversing above procedures.
OVEN CAVITY
.
All internal oven cavity components
must be removed prior to oven cavity
removal.
.
Remove the five 1/4" hex screws from
the front flange of the oven liner. (Three
screws will be on the top and two on the
bottom.)
16009721 COMPONENT ACCESS 2-3
@1999 Maytag Appliances Sales Company
160(;9721 COMPONENTACCESS 2-4
01999 Maytag Appliances Sales Company
SECTION 3. TROUBLESHOOTING
Test Access The test mode can be accessed by holding the stop time key down at
power up or by holding the stop time key down for 10 seconds within 5
minutes of power up mode, No other key can be pressed before the
stop time key, that would block the test mode access.
Test Exit Exit the test mode by pushing the cancel key or test will self-terminate
after 16 seconds from the last key command chosen.
Test Function Test mode is perfomed by pushing a keypad and testing for an output
response. When the keypad is released, the output is terminated and
the display will return to the "-" display. The following is a list of key
actions and responses.
NOTE:
1. Each time a key is pressed a tone will sound.
2. If there is a red dot on the IC-chip and the display board when you touch the oven light key,
the oven light will come on and a beep will occur. The beep is to let you know that there is
a good circuit, in case the light is blown. Also, when you press the fan speed key on a dual
speed downdraft, it will beep each time you touch the key. The first beep will be the high
setting, the second beep will be the low setting, and the third beep will be off.
Bake Key
Broil Key
Convect Bake Key
Convect Roast Key
Oven Light Key
Probe Key
Timer Keys
Clean Key
Activates bake relay on the power relay board.
Activates broil relay on the power relay board.
Activates convect bake relay (CVBAK) on the power relay board.
Activates convect roast relay (CVRST) on the power relay board.
Activates oven light (OVLT) relay on the power relay board. (See note
2 above.)
Activates the display on the control to display the probe temperature.
Activates the display to show factory codes in the blue displayed digits
and oven temperature in red.
Activates blue display digits which shows the state of the door lock
switches and the status of the user selectable options. See charts on
page 1-2. NOTE: First (left) blue displayed digit is for user selectable
options code and the fourth (right) blue digit is for the door lock switch
status code.
16009721 TROUBLESHOOTING 3-1
O1999 Maytag Appliances Sales Company
Stop Time Key Will activate the beeper 100% as long as the key is pressed. Also, it will
display the control I.D. # in the blue time digits and the power relay
board I.D. # in the red temperature digits.
Clock Key Activates all display segments to light.
Cook Time Key
Activates any fault codes stored in the memory. The time digits display
any fault codes for the membrane and control board. The temperature
digits display any fault codes for the power relay board. NOTE: If"FO"
is disDlaved, there has not been any fault codes sensed in that portion
of the svstem. Any stored fault code can be cleared to FO, after repairs
have been made, by entering the fast test and pressing both the cook
time and stop time keys for 5 seconds.
Digital Input Keys Activates the display to show the same digit (0-9) that is pressed.
Temperature Program bake above 500 °, repress bake pad and hold for 3-4 seconds,
Offset Change the pad must be re-pushed within 3 seconds. The digital keys can be
used to set the offset between positive and negative(-). Entered values
are rounded to the next 5° increment. (Example: pushing key 3 will
display a 5° increment).
Clock and
Temperature
Change
The clock can be set to be displayed in 24 hour form. Also,
temperature can be displayed in degree "C". To access, hold either
timer keys down on power up. The two left digits will display the
format for the clock, the right digit will display "F" or "C." The display
can be toggled by pushing the bake or upper bake key to toggle the
clock. The temperature display can be toggled from F to C by pushing
the broil key or upper broil key on a double oven control.
16009721 TROUBLESHOOTING 3-2
O1999 Maytag Appliances Sales Company
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