Wolf MWD24 Guide

Technical Service And Parts Manual
© WOLF APPLIANCE, INC. 2009 ALL RIGHTS RESERVED JOB AID #813632 Revision A - January 2009
Drawer Microwave
MODELS MWD24 & MWD30

1-1
General Information
Drawer Microwave
SECTION 1
GENERAL
INFORMATION

1-2
General Information Drawer Microwave
INTRODUCTION
This Wolf Drawer Microwave Technical Service and Parts Manual, Part #813632, has been compiled with information
provided by the Sharp Electronics Corporation. This manual provides the most recent technical service information
that will enable the service technician to troubleshoot and diagnose malfunctions, perform necessary repairs and
return a Wolf Drawer Microwave to proper operational condition.
The Service Technician should read the complete instructions contained in this manual before initiating any repairs on
a Wolf Appliance.
IMPORTANT SAFETY INFORMATION
Below are the Product Safety Labels used in this manual.
The “Signal Words” used are WARNING and
CAUTION.
Please note that these safety labels are placed in areas
where awareness of personal safety and product safety
should be taken and lists the precautions to be taken
when the signal word is observed.
Indicates that hazardous or unsafe practices could
result in minor personal injury, or product and/or
property damage.
INDICATES THAT HAZARDOUS OR UNSAFE
PRACTICES COULD RESULT IN SEVERE
PERSONAL INJURY OR DEATH.
In addition, please pay attention to the signal word
“NOTE”, which highlights especially important information
within each section.
TECHNICAL ASSISTANCE
If you should have any questions regarding a Wolf appli-
ance and/or this manual, please contact:
Wolf Appliance, Inc.
ATTN: Service Department
P.O. Box 44988
Madison, WI 53744-4988
Customer Service & Parts / Warranty Claims
Phone #: (800) 332 - 9513
Technical Assistance
Phone #: (800) 919 - 8324
Customer Service & Technical Assistance
Facsimile #: (608) 441 - 5887
Parts / Warranty Claims
Facsimile #: (608) 441 - 5886
Service Department e-mail Address
[email protected]
Office Hours:
7:00 AM to 7:00 PM Central Time
Monday through Friday
This manual is designed to be used by Authorized Service Personnel only. Wolf Appliance, Inc. assumes no
responsibility for any repairs made to Wolf appliances by anyone other than Authorized Service Technicians.

1-3
General Information
Drawer Microwave
TABLE OF CONTENTS
Section 1 - General Information
Introduction........................................................................ 1-2
Important Safety Information.............................................. 1-2
Technical Assistance.......................................................... 1-2
Table of Contents............................................................... 1-3
Warranty Information.......................................................... 1-4
Model Number Key............................................................. 1-5
Model Configurations......................................................... 1-6
Section 2 - Installation Information
Electrical Requirements..................................................... 2-2
Clearances and Dimensions ............................................. 2-3
Installation Procedures ...................................................... 2-4
Section 3 -Theory and Operation
User Operation .................................................................. 3-2
Set Clock ........................................................................... 3-2
Time Cooking .................................................................... 3-2
Setting Power Level .......................................................... 3-2
Sensor Cooking ................................................................. 3-3
Manual Defrost / Manual Cooking ..................................... 3-4
Add Minute ........................................................................ 3-5
More or Less Time Adjustment ......................................... 3-5
Demonstration Mode ........................................................ 3-5
Technical Operation .......................................................... 3-6
Schematic (Off Condition) ................................................. 3-7
Sensor Function ................................................................ 3-8
Sensor Circuit ................................................................... 3-9
Touch Panel Function ....................................................... 3-10
Description of LSI ............................................................. 3-11
Section 4 - Component Access and Removal
Warnings and Cautions..................................................... 4-2
Microwave Measurement Procedure ............................... 4-4
Touch Control Panel Servicing ......................................... 4-5
Drawer Microwave Disassembly ...................................... 4-6
Inner Drawer Removal ..................................................... 4-7
Choke Cover Removal ..................................................... 4-7
Rack Gear Removal ......................................................... 4-7
Control Panel Removal .................................................... 4-8
Cavity Light Replacement ............................................... 4-8
Power Cord Replacement ................................................ 4-9
Sensor, Stirrer Mtr, & Upper TCO .................................... 4-9
Auto Drawer Gear Removal ............................................. 4-10
Actuator Removal/Adjustment .......................................... 4-10
Latch Hook Assembly Removal ........................................ 4-11
Switch (Stop, Monitor, Secondary Interlock) Removal ..... 4-11
Switch (Stop, Monitor, Secondary Interlock) Adjustment . 4-12
Major Control Components .............................................. 4-13
Section 5 -Parts and Exploded Views
Parts List .......................................................................... 5-2
Exploded View ................................................................. 5-3
Section 6 - Troubleshooting Guide
Warnings and Cautions .................................................... 6-2
Microwave Measurement Procedure ................................ 6-3
Touch Control Panel Test .................................................. 6-4
Key Unit Test ..................................................................... 6-5
Relay Test ......................................................................... 6-5
Defrost Test ...................................................................... 6-6
Open Fuse On PWB ........................................................ 6-6
AH Sensor Test ................................................................ 6-7
Magnetron Assembly Test ................................................ 6-9
Thermal Cut-Out Test ....................................................... 6-10
Secondary Interlock Switch Test ...................................... 6-10
Stop Switch Test ............................................................... 6-10
Monitor Switch Test .......................................................... 6-10
Blown Monitor Fuse Test .................................................. 6-11
Power Transformer Test ................................................... 6-11
Section 7 - Wiring Diagrams
Harness Pinout Wiring ...................................................... 7-2
Power Unit Circuit ............................................................. 7-3
Power Unit Printed Circuit Board ...................................... 7-4
Control Unit Circuit ............................................................ 7-5
Control Unit Printed Circuit Board ...................................... 7-6

1-4
General Information Drawer Microwave
WARRANTY INFORMATION
This page contains a summary of the 2 & 5 Year Warranty that is supplied with every Wolf product, followed by a Non
Residential Warranty Summary and then notes about the warranties.
TWO & FIVE YEAR Warranty Summary
Two year TOTAL PRODUCT warranty, parts and labor.•
Limited Parts Only Warranty for the 3rd through 5th year on the following parts: Transformer, Magnetron,•
Capacitor, Rectifier, Electronic Control System, etc.
NOTE: This warranty only applies to products installed for normal residential use in the United States or Canada.
NON RESIDENTIAL Warranty Summary
Two year TOTAL PRODUCT warranty, parts and labor.•
NOTE: This warranty only applies to products installed in test kitchens, culinary and school kitchens, and other
installations which help promote Wolf Appliance products. Restaurant installations and other similar commercial
applications carry no warranty.
Warranty Notes:
All warranties begin at the time of the unit’s initial installation.•
All Warranty and Service information collected by Wolf Appliance, Inc. is arranged and stored under the unit•
serial number and/or the customer’s name. It is requested that you have the model and serial number available
whenever contacting the factory or parts distributor.
See Figure 1-1 for Rating Plate layout and location.•
Figure 1-1 Rating Plate Location
Rating plate: Open the drawer
fully. The label is slightly beyond
the back wall of the microwave
cavity facing up from the flat
surface.

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General Information
Drawer Microwave
DRAWER MICROWAVE FEATURES
Built-in microwave oven with•
950 watts of power
30” (762) model allows micro-•
wave to be built in to fit below a
Wolf built-in E-Series oven
Classic stainless steel finish•
Sensor cooking•
Micro warm allows you to keep•
food warm up to 30 minutes
Easy-to-operate control panel•
and 11 programmable power
levels (See Figure 1-2)
Interactive display—99 minutes,•
99 seconds
Oven drawer with window•
Control lock•
Oven light comes on when oven is operating or drawer is open•
Tight drawer seals with automatic drawer open/close•
VISUAL DISPLAY
SETUP/HELP
pad
SENSOR
POPCORN
pad
SENSOR
REHEAT
pad
SENSOR
COOK
pad
OPEN
pad
Visual
display
START/ADD
MINUTE pad
POWER LEVEL
pad
CONTROL
LOCK pad
MICRO
WARM
pad
DEFROST
pad
REHEAT
pad
CLOSE
pad
STOP/CLEAR
pad
TIMER/CLOCK
pad
Figure 1-2 Touch Control Panel
Control Panel
Menu Label
Sealing Surfaces
Drawer Guides
Vent
Light
Waveguide Cover
(DO NOT REMOVE)

1-6
General Information Drawer Microwave
COOKWARE SUGGESTIONS
NOTE: Make sure the utensil does not touch the interior
walls during cooking.
Use these utensils for safe microwave cooking and
reheating:
Glass ceramic•
Heat-resistant glass•
Microwave-safe plastics•
Microwave-safe paper plates•
Microwave-safe pottery, stoneware and porcelain•
Browning dish (Do not exceed recommended•
preheating time. Follow manufacturer’s directions.)
These items can be used for short time reheating of
foods that have little fat or sugar in them:
Wood, straw, wicker•
DO NOT USE:
Metal pans and bake-ware•
Dishes with metallic trim•
Non-heat-resistant glass•
Non-microwave-safe plastics (margarine tubs)•
Recycled paper products•
Brown paper bags•
Food storage bags•
Metal twist-ties•
NOTE: To check if a dish is safe for microwaving, place
the empty dish in the oven and microwave on HIGH for
30 seconds. If the dish becomes very hot, DO NOT use it
for microwaving.
RADIO OR TV INTERFERENCE
Should there be any interference caused by the drawer
microwave to your radio or TV, check that the drawer
microwave is on a different electrical circuit, relocate the
radio or TV as faraway from the drawer as feasible or
check position and signal of receiving antenna.
CLEANING AND CARE
Stainless Steel Surface
The exterior should be wiped often with a soft damp
cloth and polished with a soft dry cloth to maintain its
beauty. There are also a variety of products designed
especially for cleaning and shining the stainless exterior
of the oven. We recommend that the cleaner be applied
to a soft cloth and then carefully used on the stainless
exterior rather than sprayed directly on to it. Follow
package directions carefully.
Front Side of Drawer
Wipe the window on both sides with a soft damp cloth to
remove any spills or spatters. Metal parts will be easier to
maintain if wiped frequently with a soft damp cloth. Avoid
the use of spray and other harsh cleaners as they may
stain, streak or dull the door surface.
Touch Control Panel
If desired, the touch pads may be deactivated before
cleaning. See the CONTROL LOCK information on page
25 of this manual. Wipe the panel with a cloth dampened
slightly with water only. Dry with a soft cloth. Do not scrub
or use any sort of chemical cleaners. Close door and
follow directions on page 25 for turning CONTROL LOCK
off. Touch STOP/CLEAR.
Interior
Cleaning is easy because no heat is generated to the
interior surfaces; therefore, there is no baking and setting
of spills or spattering. To clean the interior surfaces,
including drawer sealing surfaces, wipe with a soft damp
cloth. Do not use abrasive or harsh cleaners or scouring
pads. For heavier soil, use mild soap; wipe clean with a
soft damp cloth. Do not use any chemical oven cleaners.
Drawer Guides
Remove the food crumbs from the drawer guides.
Wipe with a soft dry cloth in order to keep the drawer
microwave opening and closing smoothly.
Odor Removal
Occasionally, a cooking odor may remain in the drawer
microwave. To remove, combine 1 cup (250 ml) water,
grated peel and juice of one lemon and several whole
cloves in a 2-cup(500 ml) glass measuring cup. Boil for
several minutes using 100% power. Allow to set in the
drawer microwave until cool. Wipe interior with a soft
cloth.

2-1
Installation Information
Drawer Microwave
2-1
SECTION 2
INSTALLATION
INFORMATION

2-2
Installation Information Drawer Microwave
Neutral
INSTALLATION INFORMATION
Below are the Product Safety Labels used in this manual. This section of the manual covers some of the installation
issues that a service technician may need to know when servicing a Wolf Drawer Microwave. If additional installation
information is needed, after reviewing this section of the manual, please refer to the installation guide or contact the
Wolf Appliance Customer Service Department.
TO REDUCE THE RISK OF TIPPING, THE DRAWER MICROWAVE MUST BE SECURED BY A PROPERLY•
INSTALLED ANTI-TIP BLOCK.
STEPPING, LEANING OR SITTING ON THE DRAWER MAY RESULT IN SERIOUS INJURIES AND CAN ALSO•
CAUSE DAMAGE TO THE DRAWER MICROWAVE.
FOR SAFETY CONSIDERATIONS DO NOT INSTALL DRAWER IN ANY COMBUSTIBLE CABINETRY, WHICH•
IS NOT IN ACCORD WITH THE STATED CLEARANCES AND DIMENSIONS PROVIDED IN PRODUCT
INSTALLATION INSTRUCTIONS.
NEVER LEAVE CHILDREN ALONE OR UNATTENDED IN THE AREA WHERE A DRAWER MICROWAVE IS IN•
USE. NEVER LEAVE THE DRAWER OPEN WHEN THE MICROWAVE IS UNATTENDED.
DO NOT USE THE DRAWER MICROWAVE AS A STORAGE SPACE. THIS CREATES A POTENTIALLY•
HAZARDOUS SITUATION. CHECK THAT THE TIME-OF-DAY IS IN THE DISPLAY. IF NOT, TOUCH STOP/
CLEAR TO PREVENT UNINTENDED USE.
THIS DRAWER MICROWAVE MUST BE ELECTRICALLY GROUNDED IN ACCORDANCE WITH LOCAL•
CODES.
DO NOT USE AN EXTENSION CORD. IF THE POWER SUPPLY CORD IS TOO SHORT, HAVE A QUALIFIED•
ELECTRICIAN OR SERVICEMAN INSTALL AN OUTLET NEAR THE APPLIANCE.
Electrical Requirements
This appliance must be grounded. The drawer microwave
is equipped with a cord having a grounding wire with a
grounding plug. It must be plugged into a wall receptacle
that is properly installed and grounded in accordance
with the National Electrical Code and local codes and
ordinances. In the event of an electrical short circuit,
grounding reduces risk of electric shock by providing an
escape wire for the electric current.
120 volt 60Hz, AC only, 15 amp protected electrical•
supply.
Separate electrical circuit serving only this appliance.•
A properly grounded 3-prong receptacle. (See Figure•
2-1)
Figure 2-1 Grounded Receptacle
Grounding Prong
Line
Voltage
(Power)
Ground