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OVEN
BASIC: BF641FST
MODEL: BF641FST
MODEL CODE: BF641FST/XEH
VERSION : 00,01,02
SERVICE Manual
OVEN CONTENTS
1. Precaution
2. Product Specification
3. Disassembly and Reassembly
4. Troubleshooting
5. PCB Diagrams
6. Wiring Diagrams
7. Schematic Diagrams
BF641FST_XFA_05291A.indb 1 2011-10-31 1:33:19
Contents
1. Precaution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1-1 Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2-1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2-2 Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2-3 Accessory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Disassembly and Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3-1 Replacement of Door Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3-2 Replacement of Door Glass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3-3 Replacement of the rear oven Lamp Bulb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3-4 Replacement of Assy Control Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3-5 Replacement of Motor Fan Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3-6 Replacement of Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3-7 Replacement of Motor Convection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3-8 Replacement of Heater Convection Single . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3-9 Replacement of Terminal Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3-10 Replacement of Sensor Thermistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3-11 Replacement of Heater Grill . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3-12 Replacement of Heater Bottom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4-1 Part Checking method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4-2 Failure Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5. PCB Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5-1 PCB Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5-2 PCB Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6. Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
6-1 Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
7. Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
7-1 Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
BF641FST_XFA_05291A.indb 2 2011-10-31 1:33:19
1. Precaution
Follow these special safety precautions.
1-1 Safety precautions ( )
1. All repairs should be done in accordance with the 10. Always connect a test instrument's ground lead to
procedures described in this manual. This product the instrument chassis ground before connecting
complies with Federal Performance Standard 21 the positive lead; always remove the instrument's
CFR Subchapter J(DHHS). ground lead last.
2. Check all grounds.
11. Components that are critical for safety are indi-
3. Do not power the OVEN from a "2 - prong" AC cord. cated in the circuit diagram by shading,
Be sure that all of the built - in protective devices are or .
replaced. Restore any missing protective shields.
12. Use replacement components that have the same
4. When reinstalling the chassis and its assemblies, ratings, especially for flame resistance and dielec-
be sure to restore all protective devices including tric strength specifications. A replacement part
nonmetallic control knobs and compartment covers. that does not have the same safety characteristics
as the original might create shock, fire or other
5. Make sure that there are no cabinet openings
hazards.
through which people --particularly children --might
insert objects and contact dangerous voltages.
NOTE: Connect the oven to a 25 A.
6. Service technicians should remove their watches When connecting the oven to a 16 A,
while repairing an OVEN. make sure that circuit breaker can operate.
7. Design Alteration Warning: 13. Never touch any circuit wiring with your hand nor
Use exact replacement parts only, i.e., only those with uninsulated tool during operation.
that are specified in the drawings and parts lists of
this manual. Never alter or add to the mechanical or
electrical design of the OVEN. Any design changes
or additions will void the manufacturer's warranty.
Always unplug the unit's AC power cord from the
AC power source before attempting to remove or
reinstall any component or assembly.
8. Never defeat any of the B+ voltage interlocks. Do
not apply AC power to the unit (or any of its assem-
blies) unless all solid-state heat sinks are correctly
installed.
9. Some semiconductor ("solid state") devices are
easily damaged by static electricity. Such compo-
nents are called Electrostatically Sensitive Devices
(ESDs). Examples include integrated circuits and
field-effect transistors. Immediately before handling
any semiconductor components or assemblies,
drain the electrostatic charge from your body by
touching a known earth ground.
-1-
BF641FST_XFA_05291A.indb 1 2011-10-31 1:33:20
2. Specifications
2-1 Features
BASIC NEW MODEL
Model Name BF641FST/XEU BF641FST/XEH
Model Type Install Single Built-in Single Built-in
Design Classic Classic
Main sales point Even cook Even cook
Oven Features
Cavity Interior C.Enamel C.Enamel
Oven Colors STSS STSS
Oven Doors (D: double, T: triple, Q: quadruple) T T
Door Opening Drop Down Drop Down
Interior Lamp 1(Bulb) 1(Bulb)
Interior Lights position Back Back
Control Method(Oven) Dial Dial
Display LED LED
Oven - -
Cleaning Method
Heater Fixed Fixed
Electric Features
Oven Temp Ranges - Single 50~250