Thermador CJ302B User manual

SERVICE MANUAL
for
THERMADOR®
BUILT-IN OVENS
MODELS: CJ302B / CJ302W / CJ302S
Lit No. 94-30-007A October 2001
© 2001 BSH Home Appliances Corp.

CJ Oven Service Manual Lit. No. 94-30-007A
Table of Contents
General 1-8
Data Plate Location ........................................................ 1
Symbols You Will See In The Manual ............................ 2
Avoid Exposure To Excessive Microwave Energy ......... 3
Cautions To Observe When Troubleshooting ................ 4
Avoid Electrical Shock .................................................... 5
Measuring For Microwave Radiation Leakage ............ 6-7
Thermador Warranty ....................................................... 8
Servicing Components 9
Component Locations .......................................................... 9
Removing Trim, & Top Plenum Covers ............................. 10
Removing Electronic Oven Control Board ........................ 11
Removing Fuseblock & Microwave PCB Control .............. 12
Removing Light Transformer
& Double Line Break Relay .............................................. 13
The Stirrer Motor Assembly ............................................... 14
Removing Stirrer Motor Assembly .................................... 15
Removing Magnetron Fan Assembly ................................ 16
Removing Crossflow Top Cooling Blower ......................... 17
Removing High Voltage Microwave Capacitor.................. 18
Removing High Voltage Diode .......................................... 19
Removing High Voltage Microwave Transformer ........ 20-21
Removing Magnetron, & Magnetron Thermal Cutout .. 22-23
Removing Control Panel Assembly,
Display Board, & Touch Panel Glass ................................ 24
Removing Upper (Or Single) Oven Door Switch .............. 25
Removing Door Latch Assembly, High-Temp Cutout, &
Monitor & Secondary Switch Assembly ....................... 26-27
Servicing the CJ Upper Oven ............................................ 28
Removing A Halogen Light Assembly .......................... 29-30
Removing the Jet Plate Top Element ................................ 31
Stirrer Blade Assembly ...................................................... 32
Removing Meat Probe Jack .............................................. 33
Removing Jet Plate Element ............................................. 34
Removing Oven Thermal Sensor ...................................... 35
Removing Upper Oven Door Gasket ................................ 36
Removing, Reinstalling Microwave Oven Door............ 37-39
Removing Upper (Or Single) Oven Door Handle &
Outer Glass Assembly ....................................................... 40
Removing An Oven Door Hinge, Actuator Arm, Center
Glass, RF Screen & Inner Glass .................................. 41-43
Removing Upper Door Gasket .......................................... 43
Troubleshooting ................................................................. 44
Testing Components, 20A Time-Delay Fuse ............... 44
Light Transformer, Double Line Break Relay ............... 45
Stirrer Motor, High Voltage Diode ................................ 46
High Voltage Capacitor, High Voltage Transformer ..... 47
Magnetron, Magnetron Thermal Cutout (TCO) ............ 48
Magnetron Fan Motor, Crossflow Blower Motor .......... 49
Door Latch Assembly, Monitor & Secondary Switches 50
Door Switch, Oven Thermal Sensor ............................. 51
Broil Element, Bake Element ........................................ 52
Convection Element, Convection Motor ....................... 53
M/W Transformer Air Switch, Meat Probe Jack ........... 54
Microwave PCB Control................................................ 55
Microwave Components Description 56-62
Interlock Switches .............................................................. 57
Latch Mounted switch ........................................................ 57
Oven Mounted switches .................................................... 58
Switches Activated by Hook .............................................. 59
20-Ampere Fuse, Fuse Failure.......................................... 60
Diode, High Voltage Transformer, Magnetron Tube ......... 61
Microwave Board, Stirrer Motor, Microwave
Transformer Cooling Fan & Air Switch .............................. 62
CJ Lower Oven 6 3
CJ Relay Board Matrix....................................................... 64
CJ DAC Relay Board .................................................... 65-68
Wire Harnesses ............................................................ 69-70
Troubleshooting Chart for
Relay Board Headers Pin Failures ............................... 71-72
CJ Oven Control Panel ...................................................... 73
Electronic Oven Controls ................................................... 74
Control Panel Assembly .................................................... 75
Glass Touch Panel ............................................................ 76
Display Head ..................................................................... 77
Troubleshooting Chart for
Display Head Pin Failures ................................................. 78
CJ Lower Oven Illustration ................................................ 79
Removing Hidden Bake Element ................................. 80-81
Removing Oven Temperature Sensor .............................. 82
Removing Convection Bake Element ................................ 83
Removing Convection Fan Motor ................................. 84-85
Removing Halogen Lamp Holder ...................................... 86
Removing Lamp Transformer &
Lower Oven Double Line Break Relay .............................. 87
Removing Oven Light Switch, Oven Door Latch
Assembly and High Temp Cut-out ............................... 88-89
Removing Air Switches................................................. 90-91
Removing a Blower ...................................................... 92-93
Removing Lower Oven Door ............................................. 94
Removing Oven Door Gasket ........................................... 95
Removing Oven Door Components .................................. 96
Removing Oven Module .................................................... 97
Troubleshooting ................................................................. 98
Blower Motor, Air Switch .............................................. 98
Convection Fan Motor, Lamp Transformer .................. 99
Oven Door Latrch Assembly ....................................... 100
Hidden Bake Element, Broil Element ......................... 101
Convection Bake Element, Hi-Temp Cutout .............. 102
Fault Codes ..................................................................... 103
Schematic & Wiring Diagrams 104-106
CJ302 Electronic Oven Control Wiring ....................... 104
CJ302 Wiring Diagram ................................................ 105
CJ302 Schematic Diagram ......................................... 106

CJ Oven Service Manual
Lit. No. 94-30-007A
Page 1
GENERAL
DATA PLATE LOCATION
Data Plate (behind oven
cooling vent, right side)
THE CJ OVEN SERVICE MANUAL CONTAINS INFORMATION THAT IS NECES-
SARY FOR SERVICING THE THERMADOR®BUILT-IN OVEN MODELS:
CJ302B / CJ302W / CJ302S
THIS MANUAL IS DESIGNED TO BE USED ONLY BY QUALIFIED SERVICE PER-
SONNEL. THERMADOR RECOMMENDS THAT CUSTOMERS DO NOT SERVICE
THEIR OWN UNITS, DUE TO THE COMPLEXITY AND THE RISK OF HIGH-
VOLTAGE ELECTRICAL SHOCK.
THE INFORMATION IS ORGANIZED TO HELP THE SERVICER EASILY FIND
WHAT IS NEEDED TO REPAIR THE UNIT.
“CJ” Oven Service Manual

CJ Oven Service Manual Lit. No. 94-30-007A
Page 2
andproperoperation andservicingof theoven,
follow the instructions carefully each time you
see one of the symbols.
The following symbols are provided through-
out this manual. For reasons of personal safety
SYMBOLS YOU WILL SEE IN THE MANUAL
THERMADOR ASSUMES NO RESPONSIBILITY FOR ANY REPAIRS
MADE ON OUR PRODUCTS BY ANYONE OTHER THAN
AUTHORIZED THERMADOR SERVICE TECHNICIANS.
This symbol alerts you to check for micro-
wave radiation leakage and to record the
reading on the service repair ticket while in
the customers.
Service
Alert !!
This symbol alerts you to a service tip or a
special procedure.
WARNIN
G
This symbol alerts you to such dangers as
personal injury, burns, fire, and electrical
shock.
CAUTION
This alerts you to actions that could cause
product damage (scratches, dents, etc.), and
damage to your personal property.
Tech Tip !!

CJ Oven Service Manual
Lit. No. 94-30-007A
Page 3
TO AVOID EXPOSURE TO
EXCESSIVE MICROWAVE ENERGY
Observe these precautions before and during servicing:
1. Do not operate or allow the oven to be operated with the door open.
2. Make the following safety checks on all ovens to be serviced before activating the magnetron
or other microwave source, and make repairs as necessary:
a) Interlock Operation.
b) Proper Door Closing.
c) Seal and Sealing Surfaces (arcing, wear, and other damage).
d) Damage To or Loosening of Hinges and Latches.
e) Evidence of Dropping or Abuse.
3. Before turning on microwave power for any service test or inspection within the microwave
generating compartments, check the magnetron, waveguide, or transmission line, and cavity
for proper alignment, integrity, and connections.
4. Any defective or misadjusted components in the interlock, monitor, door seal, and micro-
wave generating and transmission systems shall be repaired, replaced, or adjusted by
procedures described in this manual before the oven is released to the owner.
This product should be serviced
only by trained qualified personnel.
5. Although this product has been manufactured in compliance with “FDA Radiation Perfor-
mance Standards, 21 CFR Subchapter J,”it is very important that all repairs should be made
in accordance with procedures described in this manual to avoid being exposed to excessive
microwave radiation.
6. Check for radiation leakage before and after every servicing. Refer to ”Measuring For
Microwave Radiation Leakage”on Page 6.
7. Certain components used in the microwave oven are important for safety. It is essential to
replace these critical parts only with manufacturer’s specified parts to prevent microwave
leakage, shock, fire, or other hazards. Do not modify the original design.
WARNING

CJ Oven Service Manual Lit. No. 94-30-007A
Page 4
CAUTIONS TO OBSERVE WHEN TROUBLESHOOTING
Unlike many other appliances, the microwave oven is high-voltage, high-current equipment.
Although it is free from danger in ordinary use, extreme care should be taken during repair.
There is high-voltage present, with high current capabili-
ties, in the circuits of the high-voltage winding and fila-
ment winding of the high-voltage transformer. It is ex-
tremely dangerous to work on or near these circuits with
the oven energized.
Do not measure the voltage in the high-voltage circuit,
including the filament voltage of the magnetron.
Never touch any circuit wiring with your hand or with an
insulated tool during operation.
Remove your wristwatch when working close to or when
replacing the magnetron.
CAUTION
WARNING
1. Check the grounding. The microwave oven is designed to be used when grounded. Make sure
it is grounded properly before beginning repair work.
2. Discharge the electric charge in the high-voltage capacitor. For about 30-seconds after the
oven stops, an electric charge remains in the high-voltage capacitor. When replacing or
checking parts, short between the oven chassis and the terminal of the high-voltage capacitor
(terminals of lead wire from magnetron filament, high-voltage transformer filament lead
wire, and diode lead wire) with an insulated screwdriver to discharge.
3. When parts must be replaced, disconnect the power to the unit.
4. Avoid inserting nails, wire, etc. through any holes in the unit during operation. Never insert
a wire, nail, or any other metal object through the lamp holes on the cavity or any other holes
or gaps, because such objects may work as an antenna and cause microwave leakage.
5. Confirm after repair. After repairing or replacing parts, make sure that the screws of the oven,
etc., are neither loose or missing. Microwaves might leak if screws are not properly tightened.
6. Make sure that all electrical connections are tight.
7. Check for microwave energy leakage. Refer to “Measuring For Microwave Radiation Leak-
age”on Page 6.

CJ Oven Service Manual
Lit. No. 94-30-007A
Page 5
WARNING
To Avoid Electrical Shock:
•Disconnect the power to the appliance
before servicing.
•For those checks requiring the use of elec-
trical power, exercise extreme care.
•Do not attempt high-voltage tests.
RESPECT HIGH-VOLTAGE

CJ Oven Service Manual Lit. No. 94-30-007A
Page 6
WARNING
Check for microwave radiation
leakage before and after every
servicing. Should the leakage be
more than 5 mw/cm2inform
Thermador immediately. After
repairing or replacing any radiation
safety device, keep a written record
for future reference, as required by
D.H.H.S. regulations. This
requirement must be strictly
observed. In addition, the leakage
reading must be recorded on the
service repair ticket while in the
customer’s home.
PROCEDURE FOR MEASURING
MICROWAVE RADIATION LEAKAGE
Before performing any tests, be sure to observe
the following precautions:
•Do not exceed the meter’s full-scale
deflection. Leakage monitor should
initially be set to the highest scale.
•To prevent false readings, hold the test
probe by the grip portion of the handle
only, and move it along the shaded area
shown in the following illustration.
•Meter reading with the top panel
removed should be less than 4 mw/cm2.
•Meter reading for fully assembled oven,
with the door normally closed should be
less than
4 mw/cm2.
•Meter reading for fully assembled oven,
before the latch switch (primary) is
interrupted while lightly pulling on the
door, should be less than 4mw/cm2.
!
NOTE: The maximum allowable
leakage according to U.S.
Government standard is 5 mw/cm2
while in the customer’s home. Using
4mw/cm2as the highest acceptable
meter reading, allows for meter and
probe accuracy tolerances.
Equipment:
Holaday model 1501 or equivalent meter.
Glass thermometer, 212° F. or 100° C.
600 cc glass beaker.

CJ Oven Service Manual
Lit. No. 94-30-007A
Page 7
I. Pour 275 ±15 cc (9 oz. ±1/2OZ.) of 20 ±
5ºC (68 ±9ºF) water in a beaker,
graduated to 600 cc, and place the beaker
in the center of the oven.
2. Set the radiation monitor to 2450 MHz,
and follow the manufacturer’s
recommended test procedure to assure
correct results.
NOTE: When measuring the leakage,
always use the 2 inch (5 cm) spacer
supplied with the probe.
3. Start the magnetron and measure the
leakage by holding the probe
perpendicular to the surface being
measured.
4. Measuring With The Top Panel
Removed —Whenever you replace the
magnetron, measure for radiation
leakage before the top panel is installed
and after all necessary components are
replaced or adjusted. Special care should
be taken in measuring around the
magnetron.
5. Measuring A Fully Assembled Oven
After all components, including the top
panel, are fully assembled, measure for
radiation leakage around the (door
periphery and the door viewing window.
6. Record keeping and notification after
measurement. Take a leakage reaching
after any adjustment or repair to a
microwave oven. Record this leakage on
the repair ticket, even if it is zero. A copy
of this repair ticket and the microwave
oven leakage reacting should be kept by
the repair facility.
If the radiation leakage is more than
5mw/cm2after determining that all
parts are in good condition and
functioning properly, and that genuine
replacement parts, as listed in this
manual, have been used, immediately
notify Thermador and inform the owner
that the microwave cannot be used.
7. At least once a year, have the radiation
monitor calibrated by its manufacturer.
WARNING
Avoid contacting any high-voltage parts.
!
PROCEDURE FOR MEASURING
MICROWAVE RADIATION LEAKAGE, continued

CJ Oven Service Manual Lit. No. 94-30-007A
Page 8
THERMADOR®WARRANTY
Thermador will not pay for:
1. Service by an unauthorized
agency. Damage or repairs
by an unauthorized agency
or use of unauthorized
parts.
2. Service visits to:
•Teach you how to use the
appliance.
•Correct the installation.
You are responsible for
providing electrical wir-
ing and/or gas installa-
tion and other connect-
ing facilities.
•Reset circuit breakers or
replace home fuses.
3. Damage caused from acci-
dent, abuse, alteration, mis-
use,incorrectinstallation or
installation not in accor-
dance with local codes, or
improper storage of the ap-
pliance.
4. Repairs due to other than
normal home use.
Thermador will pay for:
All repair labor and replacement
parts found to be defective due to
materials and workmanship. Ser-
vice must be provided by a Fac-
tory Authorized Service Agency,
during normal working hours.
For a Service Agency nearest you,
please call: 1-800/735-4328.
Length of Warranty
FULL ONE YEAR
For one year from date of instal-
lation or date of occupancy for a
new previously unoccupied
dwelling. Save all dated receipts
or other evidence of date of in-
stallation/occupancy date.
This warranty applies to appliances used in normal family households; it does not cover their
use in commercial situations.
This warranty is for products purchased and retained in the 50 states of the U.S.A., the District of
Columbia, and Canada. The warranty applies even if you should move during the warranty
period. Should the appliance be sold by the original purchaser during the warranty period, the
new owner continues to be protected until the expiration of the original purchaser’s warranty
period.
THERMADOR DOES NOT ASSUME ANY RESPONSIBILITY FOR INCIDENTAL OR CONSE-
QUENTIAL DAMAGES. Some states do not allow the exclusions or limitation of incidental or
consequential damages, so the above limitation or exclusion may not apply to you. This war-
ranty gives you specific legal rights. You may also have other rights which vary from state-to-
state or province-to-province.

CJ Oven Service Manual
Lit. No. 94-30-007A
Page 9
SERVICING THE COMPONENTS
The serviceable components for the upper
oven and plenum are in this section of the
manual. Components are shown below.
Refer to the pages that show the components
you wish to service.
COMPONENT LOCATIONS
TOP PLENUM COMPONENTS
FRONT COMPONENTS
Control
Panel
Door Switch
Monitor & Secondary
Switch Assembly
Door Latch Assembly High-Temp Cutout
Magnetron Fan
Assembly
Electronic
Oven
Control
Board
Fuse & Fuseblock
Microwave
PCB
Control
Light
Transformer
Double Line
Break Relay
Stirrer Motor
Magnetron
Thermal Cutoff
Crossflow Top
Cooling Blower
HV Diode
HV M/W
Transformer
HV M/W
Capacitor
Magnetron &
Waveguide

CJ Oven Service Manual Lit. No. 94-30-007A
Page 10
REMOVING THE TRIM, AND TOP PLENUM COVERS
WARNING
1. Turn off the electrical power going to the
oven.
2. Pull the oven out of its mounting location
so that you can access the trim and ple-
num covers.
3. To remove the trim, remove the two end
screws.
CAUTION
Turn off the electrical power going to the
oven before servicing.
When you work on the oven, be careful
when handling the sheet metal parts. There
are sharp edges present and you can cut
yourself if you are not careful.
4. To remove the top front plenum cover:
a) Remove the seven (7) screws.
b) Pull the cover forward and remove it.
5. To remove the top rear plenum cover, re-
move the eight screws and lift it off the
oven.
Tr i m
(2 Screws)
Top Front
Plenum Cover
(7 screws) Top Rear
Plenum Cover
(9 screws)
UPPER CJ OVEN COMPONENTS
Screw
Stirrer
Motor
Enclosure
Rack
Support
Rack
Jetplate
Bottom
Support
Rack
Element, Jet
Concealed
Plain
Washer Stirrer
Assembly
Clip
Jetplate
Jetplate Top Light Assembly

CJ Oven Service Manual
Lit. No. 94-30-007A
Page 11
REMOVING THE ELECTRONIC OVEN CONTROL BOARD
WARNING
CAUTION
Turn off the electrical power going to the
oven before servicing.
When you work on the oven, be careful
when handling the sheet metal parts. There
are sharp edges present and you can cut
yourself if you are not careful.
1. Turn off the electrical power going to the
oven.
2. Pull the oven out of its mounting location
so that you can access the trim and ple-
num covers.
3. Remove the trim and top plenum covers
from the oven (see Page 10).
4. Remove the four screws from the control
panel mounting bracket, pull the catches
out of the ball studs at each end of the
bracket, (see the small inset), and remove
the bracket from the oven.
5. Disconnect the wires from the electronic
oven control board connectors.
6. Remove the six screws from the electronic
oven control board.
If necessary, refer to Page 104 for the wire
connection callouts for single and double
electronic oven control boards.
7. Lift the front of the electronic oven con-
trol board and slide the three wire ties off
the front spacers, then remove the board
from the oven.
2 Screws 2 Screws
Control Panel
Mounting Bracket
Ball Stud Catch
Tech Tip!!
3 Screws
3 Screws
Tie Tie Tie

CJ Oven Service Manual Lit. No. 94-30-007A
Page 12
REMOVING THE FUSEBLOCK
& MICROWAVE PCB CONTROL
WARNING
CAUTION
Turn off the electrical power going to the
oven before servicing.
When you work on the oven, be careful
when handling the sheet metal parts. There
are sharp edges present and you can cut
yourself if you are not careful.
1. Turn off the electrical power going to the
oven.
2. Pull the oven out of its mounting location
so that you can access the trim and ple-
num covers.
3. Remove the trim and top plenum covers
from the oven (see Page 10).
4. Remove the control panel mounting
bracket (see Step 4 on Page 11).
5. To remove the fuseblock:
a) Pull the fuse out of the clips.
b) Remove the mounting screw from the
center of the fuseblock.
6. To remove the microwave PCB control:
a) Disconnect the wires from the termi-
nals.
b) Remove the four mounting screws
from the bracket.
BK-125
BK-126
20 Amp
Fuse Screw
4 Screws
3 White
2 Yellow
2 Orange
Screws
Screws
BK 127
BK 130
Fuse &
Fuseblock
Microwave
PCB Control

CJ Oven Service Manual
Lit. No. 94-30-007A
Page 13
REMOVING THE LIGHT TRANSFORMER
& DOUBLE LINE BREAK RELAY
WARNING
CAUTION
Turn off the electrical power going to the
oven before servicing.
When you work on the oven, be careful
when handling the sheet metal parts. There
are sharp edges present and you can cut
yourself if you are not careful.
1. Turn off the electrical power going to the
oven.
2. Pull the oven out of its mounting location
so that you can access the trim and ple-
num covers.
3. Remove the trim and top plenum covers
from the oven (see Page 10).
4. To remove the light transformer:
a) Disconnect the wires from the termi-
nals.
b) Remove the two mounting screws from
the bracket.
5. To remove the upper (or single) oven
double line break relay:
a) Disconnect the wires from the relay ter-
minals.
b) Remove the two screws.
YL-20
BU-21
OR-22
BK YL
34 10 YL
09
Double Line
Break
Relay
Screw Screw
YL-82
YL-141
YL-84
YL-85
YL-18
YL-63
RD-81WH-19
Screw Light
Transformer
Screw

CJ Oven Service Manual Lit. No. 94-30-007A
Page 14
Important
The stirrer motor assembly is comprised of the folloing parts:
(1) Stirrer Motor
(1) Stirrer Motor
Bracket
(1) Stirrer Motor
Insulation
(1) Mounting
Bracket
(1) Stirrer Bushing
(1) Stirrer Shaft
(1) Stirrer Shield
(4) Stirrer Bushing
Screws
(28) Bracket Screws
(1) Stirrer Screw
(1) Stirrer Screw
Washer
Stirrer Motor
Stirrer Motor
Bracket
Stirrer Motor
Insulation
Mounting Bracket
Stirrer Motor
Stirrer
Bushing
Stirrer
Shaft
Stirrer Shield Inside
(underneath)
(1) Stirrer
Screw
Washer
(1) Stirrer
Screw
Stirrer Motor Assembly
Do Not Dissassemble
Stirrer Motor Assembly
Proper alignment of these components is
critical. This assembly is aligned and
assembled at the factory.
Replace Entire Assembly!

CJ Oven Service Manual
Lit. No. 94-30-007A
Page 15
REMOVING THE STIRRER MOTOR ASSEMBLY
WARNING
CAUTION
Turn off the electrical power going to the
oven before servicing.
When you work on the oven, be careful
when handling the sheet metal parts. There
are sharp edges present and you can cut
yourself if you are not careful.
1. Turn off the electrical power going to the
oven.
2. Pull the oven out of its mounting location
so that you can access the trim and ple-
num covers.
3. Remove the trim and top plenum covers
from the oven.
4. Disconnect the stirrer motor wires from
the terminal block and the in-line connec-
tor.
5) Remove the fische paper over the stirrer
motor cover (2 screws).
6) Remove the stirrer motor cover (4 screws).
7) Remove the stirrer blade assembly.
Stirrer Motor Wires
In-line Connector Terminal Block
Fische Paper 2 Screws
4 Screws Cover Stirrer
Motor
8) Remove the stirrer shield (4 screws).
9) Remove the 28 mounting screws that at-
tach the stirrer motor assembly to the can.
lift the stirrer motor assembly out of the
stirrer motor cavity.
10) Reassemble and be sure to use all the new
mounting screws provided in the kit.
Stirrer Motor 28 Screws
Stirrer Motor

CJ Oven Service Manual Lit. No. 94-30-007A
Page 16
REMOVING THE MAGNETRON FAN ASSEMBLY
WARNING
CAUTION
Turn off the electrical power going to the
oven before servicing.
When you work on the oven, be careful
when handling the sheet metal parts.
There are sharp edges present and you
can cut yourself if you are not careful.
1. Turn off the electrical power going to the
oven.
2. Pull the oven out of its mounting location
so that you can access the trim and
plenum covers.
3. Remove the trim and top plenum covers
from the oven (see Page 10).
4. Disconnect the wires from the terminals
of the magnetron fan assembly.
Bracket Screws
WH-124 BU-25
5. Remove the two fan assembly bracket
screws from the plenum and remove the
assembly.
6. Remove the two duct screws and slide it
off the fan assembly.

CJ Oven Service Manual
Lit. No. 94-30-007A
Page 17
REMOVING THE CROSSFLOW TOP COOLING BLOWER
WARNING
CAUTION
Turn off the electrical power going to the
oven before servicing.
When you work on the oven, be careful
when handling the sheet metal parts. There
are sharp edges present and you can cut
yourself if you are not careful.
1. Turn off the electrical power going to the
oven.
2. Pull the oven out of its mounting location
so that you can access the trim and ple-
num covers.
3. Remove the trim and top plenum covers
from the oven (see Page 10).
4. Disconnect the wires from the terminals
of the crossflow top cooling blower.
5. Remove the three screws from the blower
mounting bracket and remove the blower
from the oven.
Top View
BU-74
BU-161
BU-163
WH75
SH162
WH-164
Crossflow Top
Cooling Blower
Cooling
Blower
Rear View
3 Screws

CJ Oven Service Manual Lit. No. 94-30-007A
Page 18
REMOVING THE HIGH VOLTAGE
MICROWAVE CAPACITOR
WARNING
CAUTION
Turn off the electrical power going to the
oven before servicing.
When you work on the oven, be careful
when handling the sheet metal parts. There
are sharp edges present and you can cut
yourself if you are not careful.
5. Disconnect the wires from the terminals
of the high voltage microwave capacitor.
6. Remove the capacitor mounting bracket
screw and remove the bracket and capaci-
tor from the transformer side shield.
1. Turn off the electrical power going to the
oven.
2. Pull the oven out of its mounting location
so that you can access the trim and ple-
num covers.
3. Remove the trim and top plenum covers
from the oven (see Page 10).
4. CAUTION: DISCHARGE THE HIGH
VOLTAGE MICROWAVE CAPACITOR
WITH A 20,000 OHM, 1- OR 2-WATT
RESISTOR TO CHASSIS GROUND
BEFORE WORKING ON ANY OF THE
HIGH VOLTAGE COMPONENTS. BE
VERY CAREFUL NOT TO TOUCH THE
BARE RESISTOR LEADS WHEN YOU
DISCHARGE THE CAPACITOR.
Touch Resistor
Lead To Chassis
Touch Resistor
Lead To Capacitor
Terminal
Bracket
Screw
Transformer
Side Shield
OR-135
OR-136
TAN-Transformer
Secondary Lead
High Voltage
Microwave Capacitor