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Samsung Electronics

6. Troubleshooting

6-1

PRECAUTION

1. CHECK GROUNDING BEFORE CHECKING FOR TROUBLE.
2. BE CAREFUL OF THE HIGH VOLTAGE CIRCUIT.
3. DISCHARGE THE HIGH VOLTAGE CAPACITOR.
4. WHEN CHECKING THE CONTINUITY OF THE SWITCHES OR TRANSFORMER, DISCONNECT ONE LEAD WIRE FROM THESE

PARTS AND THEN CHECK CONTINUITY WITHOUT THE POWER SOURCE ON. TO DO OTHERWISE MAY RESULT IN A FALSE
READING OR DAMAGE TO YOUR METER.

5. DO NOT TOUCH ANY PART OF THE CIRCUIT OR THE CONTROL CIRCUIT BOARD, SINCE STATIC DISCHARGE MAY DAMAGE IT.

ALWAYS TOUCH GROUND WHILE WORKING ON IT TO DISCHARGE ANY STATIC CHARGE BUILT UP.

6-1 Electrical Maltunction

SYMPTOM

CAUSE

CORRECTIONS

Oven is dead.

1. Open or loose lead wire harness

Check fan motor when thermal cutout is defective.

Fuse is OK.

2. Open thermal cutout (Magnetron)

No display and no operation at all.

3. Open low voltage transformer

Check Ass'y PCB when LVT is defective.

4. Defective Ass'y PCB

No display and no operation at all.

1. Shorted lead wire harness

Check adjustment of primary, interlock monitor,

Fuse is blown.

2. Defective primary latch switch (NOTE 1)

door sensing switch.

3. Defective monitor switch (NOTE1)
4. Shorted HVCapacitor
5. Shorted HVTransformer (NOTE2)

NOTE 1: All of these switches must be replaced at the same time.

(refer to adjustment instructions)
Check continuity of power relay contacts and if it has continuity, replace power
relay also.

NOTE 2: When HVTransformer is replaced, check diode and magnetron also.

Oven does not accept

1. Key input is not in-Sequence

Refer to operation procedure.

key input (Program)

2. Open or loose connection of membrane

key pad to Ass'y PCB

3. Shorted or open membrane panel
4. Defective Ass'y PCB

Replace PCB main.

1. Off-alignment of latch switches

Adjust door and latch switches.

2. Open or loose connection of high voltage

circuit especially magnetron filament
circuit

NOTE: Large contact resistance will bring
lower magnetron filament voltage and

Timer starts countdown but no

cause magnetron to lower output and/or

microwave oscillation.

intermittent oscillation.

(No heat while oven lamp and

3. Defective high voltage components

Check high voltage component according to

fan motor turn on.)

H.V.Transformer

component test procedure and replace if it is

H.V.Capacitor

defective.

H.V.Diode, H.V.Fuse
Magnetron

4. Open or loose wiring of power relay
5. Defective primary latch switch
6. Defective power relay or Ass'y PCB

Replace PCB main.

Содержание G-643C

Страница 1: ...SERVICE MANUAL SAMASUNG G 643C MODEL ...

Страница 2: ...31 COOLING METHOD COOLING FAN MOTOR OUTSIDE DIMENSIONS 489 W x 275 H x 361 D POWER LEVEL 10 80W 4 sec 26 sec 20 160W 7 sec 23 sec 30 240W 10 sec 20 sec 40 320W 13 sec 17 sec 50 400W 16 sec 14 sec 60 480W 19 sec 11 sec 70 560W 22 sec 8 sec 80 640W 25 sec 5 sec 90 720W 28 sec 2 sec 100 800W 30 sec 0 sec ON TIME OFF TIME 2 2 Comparison Chart MODEL FEATURE MORE LESS AUTO COOK DISH AUTO DEFROST TIME CO...

Страница 3: ... G643C 1 min Auto lbs oz g kg 489mm 356 5mm 275mm 203mm 361mm Auto 10min 1min h 10s min G643C 1 min Auto lbs oz g kg Auto 10min 1min h 10s min G643C 1 min Auto lbs oz g kg Instant Cook Button Auto Cook Button Memory Button Kg g more and less Button Auto Defrost Button Clock Setting Button Timer Setting Button MWO Grill Cycle Button Start and Boost Button Stop Button Grill Button Power Level Select...

Страница 4: ...agnetron very carefully 7 Remove screws from the back panel 8 Take out the fan motor 9 Remove the oven lamp by rotating to pull out from hole of air cover NOTE1 When removing the magnetron make sure that its antenna does not hit any adjacent parts or it may be damaged NOTE2 When replacing the magnetron be sure to remount the magnetron gasket in the correct position and make sure the gasket is in g...

Страница 5: ...andling Door C because it is fragile Following the procedure as shown in the figure insert and bend a thin metal plate between Door E and Door A until you hear the tick sound 1 Insertion depth of the thin metal plate should be 0 5mm or less Remove pin hinge from Door E Detach spring from Door E and key door 4 3 2 Removal of Door C 4 3 3 Removal of Door E Key Door Spring Door E Disassembly and Reas...

Страница 6: ...a screw driver 10 Remount the coupler in the correct position 1 Take out the outer panel 2 Disconnect the connectors from the heater ceramic and wire leade 3 Remove screws securing the bracket upper to the oven cavity 4 Remove one screw securing the bracket heater 4 4 Replacement of Fuse 4 5 Replacement of Drive Motor 4 6 Replacement of Ceramic Heater Disassembly and Reassembly Screw Drive Motor C...

Страница 7: ...onnecting the FPC connector make sure that the holes on the connector are properly engaged with the hooks on the Plastic Fastener 1 Window display should not be disassembled as its mounting tabs will be broken If repair work is difficult replace with Ass y control panel 2 The membrane key board is attached to the escutcheon base with doublefaced adhesive tape Therefore applying hot air such as usi...

Страница 8: ...minal and magnetron case should read open 1 The low voltage transformer is located on the control circuit board 2 Remove the low voltage transformer from the PCB Ass y and check continuity 3 Normal resistor reading is shown in the table PRECAUTION 1 High voltage is present at the high voltage terminals during any cook cycle 2 It is neither necessary nor advisable to attempt measurement of the high...

Страница 9: ...djust the Latch Body by moving it so that the oven door will not have any play in it Check for play in the door by pulling the door assembly Make sure that the latch keys move smoothly after adjustment is completed Completely tighten the screws holding the Latch Body to the oven assembly 4 Reconnect to Monitor switch and check the continuity of the monitor circuit and all latch switches again by f...

Страница 10: ...nal power test should be made if temperature rise is marginal NOTE 2 Output power in watts is computed by multiplying the temperature rise step E by a factor of 91 times the of centigrade temperature The microwave heat distribution can be checked indirectly by measuring the water temperature rise at certain positions in the oven 1 Prepare five beakers made of Pyrex having 100 milliliters capacity ...

Страница 11: ...nt 1 After adjustment and repair of a radiarion preventing device make a repair record for the measured values and keep the data 2 If the radiation leakage is more than 4 mW after determining that all parts are in good condition functioning properly and the identical parts are replaced as listed in this manual notift that fact to CENTRAL SERVICE CENTER 5 13 2 At least once a year have the microwav...

Страница 12: ...witch 3 Defective monitor switch NOTE1 4 Shorted HVCapacitor 5 Shorted HVTransformer NOTE2 NOTE 1 All of these switches must be replaced at the same time refer to adjustment instructions Check continuity of power relay contacts and if it has continuity replace power relay also NOTE 2 When HVTransformer is replaced check diode and magnetron also Oven does not accept 1 Key input is not in Sequence R...

Страница 13: ...ise can be heard 1 Loose fan and fan motor Tighten screws of fan motor 2 Loose screws on H V Transformer Tighten screws of H V Transformer 3 Shorted H V Diode Replace H V Diode Turntable motor does not rotate 1 Open or loose wiring of turntable motor Replace turntable motor 2 Defective turntable motor 21V Oven stops operation during cooking 1 Open or loose wiring of primary Adjust door and latch s...

Страница 14: ...ts List 7 1 Exploded Views 7 1 M1 M2 M34 M7 M13 M5 M4 M14 M35 M36 M19 M3 M28 M18 M20 M11 M16 M17 M22 M21 M25 M26 M23 M12 M15 M24 M27 M9 M10 B5 B4 B3 B2 B1 M37 D4 D5 D3 D2 D1 D7 D8 D6 M6 M30 M33 M29 M31 M32 C1 C7 C2 C3 C4 C5 C6 ...

Страница 15: ...1 M 17 DE03 30029A MAGNETRON OM75SH 31 ESS 1 M 18 DE39 20131A ASSY POWER CORD KKDK 230V50HZ 1500 GRAY 1 M 19 DE47 70030D HEATER CERAMIC 115V 490W 260HM 6 1 M 20 DE61 50401A BRACKET HEATER ALSTER T0 5 60 70 M67G45 1 M 21 DE91 40093A ASSY NOISE FILTER SN EI0D 250V 10A 1 M 22 DE31 30031A FAN MOTOR SMF745EA 230V 50HZ ASSY FAN MOTOR 1 M 23 DE59 40001A DIODE H V HVR 1X 32B 12 1 M 24 DE91 70061B ASSY H V...

Страница 16: ...ption Specification Q ty Remarks C 1 DE91 10403A ASSY P C B MAIN 230V50HZ NS VFD G643C EURO N 1 C 2 DE66 20171A BUTTON PUSH ABS WHT G643C 1 C 3 DE61 70076A SPRING BUTTON HSWR PI0 6 1 C 4 DE34 10212A SWITCH MEMBRANE PET 230V50HZ 89 4 156 4 G6 1 C 5 DE67 40142A WINDOW DISPLAY ACRYL BLK G643C 1 C 6 DE72 70164A CONTROL PANEL ABS WHT T2 5 G643C 1 C 7 CE93 30383A ASSY CONTROL PANEL S DESIGN P WHT G643 M...

Страница 17: ...069A SCREW TAP TH TH M4 L10 FRFZY 1 CV AIR DE60 10080A SCREW WASHER M5 L12 2S 4 HVT DE60 10080A SCREW WASHER M5 L12 2S 4 MGT DE60 10082I SCREW A 2S 4X12 FEFZY 4 B PLTE DE60 10082I SCREW A 2S 4X12 FEFZY 2 BD LAT DE60 10082I SCREW A 2S 4X12 FEFZY 2 CON PA DE60 10082I SCREW A 2S 4X12 FEFZY 4 OUT PN DE60 10082J SCREW TAPPING TH 2S 4X8 MSWR3 ZPC YEL WS 1 B HVC DE60 10098A SCREW ASSY TAPTITE PH TC M4X8 ...

Страница 18: ...8 P C B Diagrams 8 1 P C B Diagrams Samsung Electronics 8 1 ...

Страница 19: ...ON 3 9Kohm 5 1 8W AA TP 1 8x3 2m 7 11 13 20 23 42 2001 000776 R CARBON 470ohm 5 1 2W AA TP 3 3x9m 1 R01 2001 000786 R CARBON 47Kohm 5 1 8W AA TP 1 8x3 2m 12 R30 41 2011 001043 R NETWORK 47Kohm 5 1 8W A SIP 8P BK 1 AR01 2202 000780 R CERAMIC MLC AXIAL UPO50F104Z 100NF 80 20 6 C06 09 12 15 2401 000247 C AL 1SA1ANB107MAN 100UF 20 10V GP 6 3X11M 1 C04 2401 000353 C AL 1SA1HWB101M 100UF 20 50V GP 10X16...

Страница 20: ... RELAY POWER RELAY INRUSH RELAY GRILL RELAY DOOR SENSING SWITCH RESISTOR MONITOR SWITCH POWER RELAY F FA MAGNETRON NO COM NO COM NO NO BLK BLK BLK ORG ORG BLK BLK BLK BLU BLK COM 0V LAMP 230V40W DRIVE MOTOR FAN MOTOR L V TRANS PRIMARY LATCH SWITCH DOOR SENSING LATCH SWITCH MONITOR SWITCH L FM H V T H V D H V C 0 95uF H V FUSE 0 75A 1mH BRN BROWN BLU BLUE ORG ORANGE RED RED WHT WHITE BLK BLACK YEL ...

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