Samsung BF641FST Service Manual Download Page 40

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7. Schematic Diagram

+12V

78L05

KRA226

R501

CONV

CONV-M

LIVE

GRILL_SENS

CONV_SENS

CONV

STAND-BY

CONV-M

FAN-M

LIVE

STAND-BY

ATAG_OPTION

+5V

C105

IC102

100uF

C106

470uF

ECD401

EC12E2424404

BUZZER

OSCILLATOR

INTERRUPT

RESET

RELAY CONTROL

On board writing

PREHEAT LED

TEMP CONTROL

TEMP SELECT

TR106

INT

PULSE-2

BAND-2

BAND-1

AD-IN

INT

SAFETY

OCDCK

BAND-2

TEMP_SELECT

PULSE-2

OTHERS

When MICOM program changed, insert connector.

GRILL SENS

CONV SENS

POWER SUPPLY

POWER SENS

MICOM

DISPLAY

TIME SELECT

THERMISTOR

DELETE :

INSERT :

ATAG

KRC246

TR107

C107

100nF

R115

330

R502

330

VR401

RK11K1140-103

47K

R118

C117

100nF

+12V

R201

10K

LNK304P

IC101

R114

47K

+5V

1uF

C701

TR204

KRC246

47K

R112

10uF

C110

33ohm

PTC101

KRA226-AT

TR501

TR104

+5V

KRC246

R104

+5V

R407

1uF

C301

C111

100nF

R106

R101

C402

100nF

KRC246

TR202

+5V

R105

7033P

IC104

+5V

100nF

C115

L101

1mH

22pF

C108

C102

4.7uF

D101

1N4007

R405

R111

+12V

R302

3.01K

R303

R110

PC817

PC101

+5V

R113

DHT0A103J

TH701

8.000MHz

XTL101

8 RESET

20 VAref

5 VDD

1 VSS

2 X-IN

3 X-OUT

26
14

38
39

4 MODE

6 P02

47K

R109

IC103

TMP89FH42UG

10uF

+5V

C202

TR203

KRA226

R701

4.7uF

C101

TR201

KRC246

10D471

ZNR101

R202

100

L102

1mH

D103

UF4007

100nF

C103

G5T-1A-12VDC

RY203

D203

1N4148M

KRC246

TR205

ZD101

MTZJ12B

100nF

C112

R802

47K

+5V

R801

C116

100nF

R402

C113

1nF

R301

100K

1N4148M

D202

RY202

G5T-1A-12VDC

BZ501

CBE2220BA

R403

TR102

KRA226-AT

200K

R107

SMW250-04V_WHT

CN301

C109

22pF

ZD102

MTZJ4.7B

C201

100nF

R304

D302

1N4148M

SMW250-05V(BLU)

CN302

RY201

DU12D1-1P

1uF

C401

100nF

C403

R406

KRA226-AT

TR101

KRA226-AT

TR103

+12V

+5V

C114

100nF

R401

TR105

KRC246M

R404

C404

100nF

+5V

R108

200K

5 4G

1 DOV

13 a

12
11 c

10 d

9 e

8 f

7 g

6 uc_lc

+5V

DSP101 HL-LED187SO-A

2 1G

3 2G

R702

SMW250-09V_RED

CN101

R117

220

R601

+12V

RED_1.4x1.25

LED601

+5V

KRC246

TR601

+5V

D201

1N4148M

+5V

R116

10K

1N4148M

D301

OCDKIO

OCDCK

MODE

POWER_SENS

GRILL_SENS

POWER

FAN-M

FAN

PREHEAT

FAN

PREHEAT

TH-IN

uc_lc

AD-IN

BAND-1

PULSE-1

SELECT

POWER

RESET

SELECT

TEMP_SELECT

POWER_SENS

OCDKIO

MODE

RESET

SAFETY

PULSE-1

uc_lc

7-1 Schematic Diagram

(01Version)

BF641FST_XFA_05291A.indb 38

2011-10-31 �� 1:33:46

Summary of Contents for BF641FST

Page 1: ...ion 2 Product Specification 3 Disassembly and Reassembly 4 Troubleshooting 5 PCB Diagrams 6 Wiring Diagrams 7 Schematic Diagrams BASIC BF641FST MODEL BF641FST MODEL CODE BF641FST XEH VERSION 00 01 02 BF641FST_XFA_05291A indb 1 2011 10 31 1 33 19 ...

Page 2: ...ng 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...

Page 3: ...tall 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 ...

Page 4: ... Oven Dial Dial Display LED LED Cleaning Method Oven Heater Fixed Fixed Electric Features Oven Temp Ranges Single 50 250 C 50 250 C Grill Heater In Out 1600W 700W 1600W 700W Bottom Heater 600W 600W Convection Heater Upper Lower 1700W 1700W Energy Class A A Oven Function Number of Functions 6 6 Single Mode 1 Convection Yes Yes 2 Top heat convection Yes Yes 3 Conventional Yes Yes 4 Large Grill Yes Y...

Page 5: ...SIC NEWMODEL Power source 230V 50Hz AC 230V 50Hz AC Volume usable capacity 65L 65L Output Power MAX 3 400W MAX 3 400W Weight Net 33kg approx 33kg approx Shipping 38kg approx 38kg approx Outside dimensions 595 W x595 D x566 H 595 W x595 D x566 H Shipping weight Net 33Kg Gross 38Kg Net 33Kg Gross 38Kg Export Zone UK HUNGARY 2 2 Specification BF641FST_XFA_05291A indb 3 2011 10 31 1 33 20 ...

Page 6: ... 4 2 3 Accessory Description Code No Q ty Back RACK WIRE DG59 00001A 1 TRAY BAKING A DG63 00012A 1 BF641FST_XFA_05291A indb 4 2011 10 31 1 33 20 ...

Page 7: ...ion Photo Explaination Door Assembly 1 Turn over the clips of both hinges 2 With both hands grasp the middle sides of the oven door 3 Rotate the door by approx 70degree until the hinges can be taken out completely from the hinges holes BF641FST_XFA_05291A indb 5 2011 10 31 1 33 20 ...

Page 8: ...pecially on the edges of the front sheet Parts Explaination Photo Explaination Door Glass Screw Screw Screw Screw Door bracket Door bracket Glass 1 Glass 1 1 Remove the two screws of the left and right sides of the door 2 Take off the door bracket Glass 1 Glass 1 Glass 1 Printing 3 Detach the inner glass 1 number 1 from the door When assembly the inner glass 1 put printing to direction below Glass...

Page 9: ...Parts Explaination Photo Explaination Door Glass Holder Glass Rubber Door Bracket Glass 1 Glass 2 Glass 3 3 2 Replacement of Door Glass Continued 00 01 version BF641FST_XFA_05291A indb 7 2011 10 31 1 33 22 ...

Page 10: ...om the door it can cause injury due to sheet ATTENTION The glass may break if you use force especially on the edges of the front sheet Parts Explaination Photo Explaination Door Glass 1 Push the both side button 2 Take off the Duct door 3 Detach the inner glass 1 number 1 from the door When assembly the inner glass 1 put printing to direction below 4 Detach the inner glass 2 BF641FST_XFA_05291A in...

Page 11: ...Lamp Bulb Parts Explaination Photo Explaination Lamp Bulb 1 Take off the cap by turning counterclockwise 2 Remove the metal ring and the sheet ring and clean the glass cap 3 If necessary replace the bulb with a 25 watt 230 V 300 C heat resistant oven light bulb 4 Fit the metal and the sheet ring to the glass cap 5 Replace the glass cap BF641FST_XFA_05291A indb 9 2011 10 31 1 33 22 ...

Page 12: ... from the main pcb 2 Remove the connector from Main TCO 3 Remove the connector A and B 2 Take off the three knob dial 3 Remove three screws at both sides of assy control box lift up assy control box and pull forward to separate Assy Select S W Parts Motor Fan Cooling Assy PCB Parts Main PCB Assy Display A B BF641FST_XFA_05291A indb 10 2011 10 31 1 33 24 ...

Page 13: ...Assy PCB Parts Main PCB Assy Display Explaination Photo Explaination 1 Remove Three connectors from the main pcb 2 Remove the connector A and B 3 Take off the three knob dial 4 Remove three screws at both sides of assy control box lift up assy control box and pull forward to separate A B BF641FST_XFA_05291A indb 11 2011 10 31 1 33 26 ...

Page 14: ... 12 3 4 Replacement of Assy Control Box Continued Remove 4 screws Remove 2 screws BF641FST_XFA_05291A indb 12 2011 10 31 1 33 27 ...

Page 15: ...ng Parts Explaination Photo Explaination Fan Cooling 1 Remove four screws Parts Explaination Photo Explaination Thermostat 1 Remove two screws 2 Unfold two points 3 6 Replacement of Thermostat BF641FST_XFA_05291A indb 13 2011 10 31 1 33 28 ...

Page 16: ...wer Nut Hexagon cap Parts Explaination Photo Explaination Motor Convection 1 Remove four screws at the back inside cavity to separate the cover casing 2 Turn Nut Hexagon cap to the left to release and separate spacer fan convection and fan convection Upper Counterclockwise Lower Clockwise 3 Remove three screws securing motor convection BF641FST_XFA_05291A indb 14 2011 10 31 1 33 30 ...

Page 17: ... 1 Remove four screws at the back inside cavity to separate the cover casing 2 Turn Nut Hexagon cap to the left to release and separate spacer fan convection and fan convection Upper Counterclockwise Lower Clockwise 3 Remove two connector from convection motor 4 Remove turn toward the counter clockwise to separate BF641FST_XFA_05291A indb 15 2011 10 31 1 33 31 ...

Page 18: ...nation Photo Explaination Heater Convection Single 1 Remove two screws securing heater convection at the rear 2 Pull the securing bracket at the left forward and pull it toward the left to separate heater convection BF641FST_XFA_05291A indb 16 2011 10 31 1 33 32 ...

Page 19: ...aination Terminal Block 1 Remove two screws 3 9 Replacement of Terminal Block Parts Explaination Photo Explaination Sensor Thermistor 1 Remove a screw 3 10 Replacement of Sensor Thermistor BF641FST_XFA_05291A indb 17 2011 10 31 1 33 32 ...

Page 20: ...er Grill 1 Remove each nut frange at right and left sides 2 Remove the two screws of inside cavity Parts Explaination Photo Explaination Heater Bottom 1 Remove a screw and pull forward to separate it 3 12 Replacement of Heater Bottom BF641FST_XFA_05291A indb 18 2011 10 31 1 33 33 ...

Page 21: ...0 MΩ exceed 00Version 100 MΩ exceed Cooling TCO 0 1 1 Ω 00Version Convection Motor 100 350 Ω 100 MΩ exceed Bottom Heater 10 150 Ω 100 MΩ exceed Fan Motor 100 350 Ω 100 MΩ exceed Grill Heater 10 150 Ω 100 MΩ exceed Convection Heater 10 150 Ω 100 MΩ exceed BF641FST_XFA_05291A indb 19 2011 10 31 1 33 33 ...

Page 22: ... when the oven works during CUT OFF TIME in the same mode and at the same temperature without any operation of an user This error is to prevent a risk of fire and hazards in case an user forgets to turn off the oven after use or the oven automatically starts in an unusual way The oven can be used after off Touch Button Short This error occurs when a button is pressed and held for over 10 seconds I...

Page 23: ...tage change as the humidity temperature and weight change Replace the sensor Check if the sensor wire is damaged if the housing is loose and if the sensor and the wire are properly connected Check if the voltage of the GND and sensor changes using a digital multi meter by forcefully changing the humidity temperature and weight Connect the sensor Connect the wire properly S W Error After Power On d...

Page 24: ...d related parts such as the connector or soldering parts are slightly shorted Remove the shorted part of the temperature sensor Remove any foreign Substance from the shorted part YES NO YES YES NO NO YES NO Sensor Short Error E 22 Is the sensor shorted The sensor is out of order Replace the sensor Perform the operation again and check if it is working properly S W Error After Power On does the sym...

Page 25: ...ternal temperature Is it temperature 100 C in oven Is it temperature 105 C 240 C in oven Is it temperature 245 C in oven Does same error arise S W Error S W Error Does same error arise Does same error arise Has it worked for 8 hours continuously Has it worked for 6 hours continuously Has it worked for 4 hours continuously Turn the oven off and let it cool sufficiently After Power On does the sympt...

Page 26: ... is working properly S W Error Is a specific key not recognized Is the key recognized intermittently The Button is defective Replace the Control Panel Is the key not recognized at all After Power On does the symptom continue Replace the PCB 4 2 6 SE BF641FST_XFA_05291A indb 24 2011 10 31 1 33 35 ...

Page 27: ...the heater temperature very low Is the temperature sensor connected properly Is the resistance between the heater terminals more then a few MΩ Check the heater related drive part Replace the heater Reconnect the temperature sensor properly Replace the heater Does the heater work S W Error After Power On does the symptom continue Replace the PCB Perform the operation again and check if it is workin...

Page 28: ...aintained over 320 degrees Is the temperature sensor connectivity normal Is the Heater connectivity normal An E 0A error occurred Reconnect the temperature sensor properly Check and repair the heater drive part if necessary S W Error After Power On does the symptom continue Replace the PCB Perform the operation again and check if it is working properly housing connector 4 2 8 E 0A BF641FST_XFA_052...

Page 29: ...inal block voltage 230V Reset The circuit braker or Check main power NO TCO open Check main TCO Grill TCO Replace TCO NO Check the input voltage of PCB SMPS input checkpoint 230V Repair Faulty wiring NO 4 2 9 Power Failure BF641FST_XFA_05291A indb 27 2011 10 31 1 33 36 ...

Page 30: ...ck Motor Connect wire Remove Motor Resistor check Cooling motor 238Ω Convection Motor 218Ω Motor Terminal Voltage check Replace Motor PCB SMPS Input Voltage check input check point 5V 230V Repair Faulty wiring PCB SMPS output Voltage check output check point 5V 12C Replace PCB PCB Relay contact short check Replace PCB YES NO NO YES YES NO YES YES NO YES NO NO 4 2 10 TCO Open BF641FST_XFA_05291A in...

Page 31: ...ate for each relay Reset the circuit braker or check main power Repair Faulty wiring or PCB check Check Terminal block voltage 230V Replace Safety Relay Do all relays operate After Lamp On Safety Relay Contact point ON 12V Check the operating Base voltage 0V of Safety Relay Replace PCB YES NO YES NO NO Replace PCB YES YES YES NO YES NO NO YES Replace PCB YES NO 4 2 11 PCB Failure BF641FST_XFA_0529...

Page 32: ...of heating elements Perform PCB Check Process TCO Open Check Relay Terminal Volt age 230V Replace heater After removing Heater Wire Check Heater resistance Large G 32 8Ω Small G 48 6Ω Bottom 48 1Ω Conv 44Ω Check heater s terminal volt age 230V YES NO YES YES YES NO NO NO 4 2 12 Failure of heating elements BF641FST_XFA_05291A indb 30 2011 10 31 1 33 36 ...

Page 33: ...ule 1 CN301 Oven thermistor connector Connected to oven thermistor 2 CN101 Grill Power sense AC power connector Connected to mode switch AC power Neutral 3 RY201 Heater Convection motor connector Connected to Heater convection motor common BF641FST_XFA_05291A indb 31 2011 10 31 1 33 40 ...

Page 34: ...LL SENSE 2 NO PIN 3 POWER SENSE 4 NO PIN 5 NEAUTRAL INPUT CN301 1 NO CONNECTION 2 NO CONNECTION 3 THERMISTOR 4 THERMISTOR RY201 HEATER CONTROL 5 2 PCB Diagram 00Version BF641FST_XFA_05291A indb 32 2011 10 31 1 33 40 ...

Page 35: ...ctor Connected to mode switch AC power Neutral 2 CN301 Oven thermistor connector Connected to oven thermistor 3 RY201 Heater relay Connected to Heater convection motor common 4 RY202 Cooling motor relay Connected to cooling motor 5 RY203 Convection motor relay Connected to convection motor BF641FST_XFA_05291A indb 33 2011 10 31 1 33 45 ...

Page 36: ...AUTRAL INPUT 6 No Pin 7 Cooling Motor 8 No Pin 9 Convection Motor CN301 1 NO CONNECTION 2 NO CONNECTION 3 THERMISTOR 4 THERMISTOR RY201 HEATER CONTROL RY202 Cooling Motor Control RY203 Convection Motor Control 5 2 PCB Diagram 01Version BF641FST_XFA_05291A indb 34 2011 10 31 1 33 45 ...

Page 37: ... 35 6 Wiring Diagram This Document can not be used without Samsung s authorization 6 1 Wiring Diagram 00Version BF641FST_XFA_05291A indb 35 2011 10 31 1 33 45 ...

Page 38: ... 36 6 Wiring Diagram This Document can not be used without Samsung s authorization 6 1 Wiring Diagram 01Version BF641FST_XFA_05291A indb 36 2011 10 31 1 33 45 ...

Page 39: ... 4 N 1 2 0 1 D K 3 1 1 0 1 R 2 0 3 N C U L B V 5 0 0 5 2 W M S 3 2 5 4 1 P 1 1 D 2 1 U D 1 0 2 Y R 1 0 4 C F u 1 4 0 4 R K 2 F n 0 0 1 7 0 1 C 0 3 3 2 0 5 R F p 2 2 9 0 1 C K 3 3 3 0 1 R K 2 4 1 1 R 7 0 0 4 N 1 1 0 1 D 5 0 1 D M 8 4 1 4 N 1 F n 1 3 1 1 C V 5 V 5 K 0 7 4 2 1 1 R 3 0 3 R K 2 K 0 7 4 7 1 1 R F u 0 7 4 6 0 1 C K 2 5 0 4 R 5 0 L 8 7 2 0 1 C I P B 5 D B F 4 1 1 S 2 S 7 2 7 S 8 S 8 1 0 1...

Page 40: ...ref 5 VDD 1 VSS 2 X IN 3 X OUT 23 24 25 26 14 15 16 27 37 38 39 40 29 30 11 7 4 MODE 6 P02 19 9 32 31 12 13 22 21 28 10 17 18 47K R109 IC103 TMP89FH42UG 10uF 5V C202 TR203 KRA226 R701 2K 4 7uF C101 TR201 KRC246 10D471 ZNR101 R202 100 L102 1mH D103 UF4007 100nF C103 G5T 1A 12VDC RY203 D203 1N4148M KRC246 TR205 ZD101 MTZJ12B 100nF C112 R802 47K 5V 2K R801 C116 100nF 2K R402 C113 1nF R301 100K 1N4148...

Page 41: ... Service Partner Network Contry Web Site North America service samsungportal com Latin America latin samsungportal com CIS cis samsungportal com Europe europe samsungportal com China china samsungportal com Asia asia samsungportal com Mideast Africa mea samsungportal com Samsung Electronics Co Ltd October 2011 Printed in Korea BF641FST_XFA_05291A indb 39 2011 10 31 1 33 46 ...

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