Kenwood KM3901T Service Manual Download

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9. Schematic Diagrams

9-1 Schematic Diagrams

9-1

230V~
50Hz

BRN

BLK

YEL

ORG

BLK

WHT

BLU

21V

230V

WHT

BLU

500K

2200pF

LIN-CAPACITORT 0.1uF

BLU

ASSY CHOKE P.C.B

MGT

TCO

CAVITY

TCO

GRILL

RELAY

HEATER

GRILL THERMOSTAT

MONITOR

FUSE

(250V 1.6A)

TIMER

SWITCH

INRUSH RELAY

MAIN RELAY

L.V.T

MAIN

RELAY

POWER

RELAY

INRUSH

RELAY

GRILL

RELAY

DOOR

SENSING

SWITCH

RESISTOR

MONITOR

SWITCH

POWER RELAY

MAGNETRON

COM

BLK

BLK BLK

ORG

BLK

BLK BLK

BLU BLK

COM

LAMP

(230V40W)

DRIVE MOTOR

FAN MOTOR

L.V.TRANS

PRIMARY
LATCH
SWITCH

DOOR SENSING
LATCH
SWITCH

MONITOR
SWITCH

H.V.T

H.V.D

H.V.C (0.95uF)

H.V.FUSE
(0.75A)

1mH

BRN

BROWN

BLU

BLUE

ORG

ORANGE

RED

WHT

WHITE

BLK

BLACK

YEL

YELLOW

GRN

GREEN

Y/G

YELLOW/GREEN

SYMBOL

COLOR

NOTE

FUSE

250V10A

1. INPUT : 230V
2. DOOR : OPEN
3. LAMP : ON
4. : P.C.B PATTERN
5. : P.C.B IN/OUT

POINT

Summary of Contents for KM3901T

Page 1: ...nual MICROWAVE OVEN CONTENTS 1 Precaution 2 Specifications 3 Operating Instructions 4 Disassembly and Reassembly 5 Alignment and Adjustments 6 Troubleshooting 7 Exploded Views and Parts List 8 PCB Diagrams 9 Schematic Diagrams KENWOOD ...

Page 2: ... interlock monitor switch 12 If the fuse is blown by the Interlock Monitor Switch Replace all of the following at the same time Primary and secondary switches as well as the Interlock Monitor Switch The correct adjustment of these switches is described elsewhere in this manual Make sure that the fuse has the correct rating for the particular model being repaired 13 Design Alteration Warning Use ex...

Page 3: ...igh voltages this includes the filament voltage of the magnetron High voltage is present during any cook cycle Before touching any components or wiring always unplug the oven and discharge the high voltage capacitor See Figure 1 1 2 The high voltage capacitor remains charged about 30 seconds after disconnection Short the negative terminal of the high voltage capacitor to to the oven chassis Use a ...

Page 4: ...ING 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 O AUTO COOK DISH O AUTO DEFROST O TIME COOK O POWER LEVEL...

Page 5: ...r clock KM3901T start 1min stop cancel 489mm 356 5mm 275mm 203mm 361mm Instant Cook Button Clock Setfing Memory Cook Feature Weight Selection Auto Defrost Selection Clock Setting Time Setting and Serving Selection Grill Mode Start Button Stop Cancel Button Dual Mode Selection Microwave Grill Cooking Time Adjustment Settings Cooking Time Setting Microwave Mode plated meal lbs kg oz g auto weight de...

Page 6: ...ery 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 good condit...

Page 7: ...or 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 Reassembly Upp...

Page 8: ...iver 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 Cover Base ...

Page 9: ...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 using of hair...

Page 10: ...l 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 vol...

Page 11: ...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 following t...

Page 12: ...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 each 2 Mea...

Page 13: ...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 cm2 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 microwave energy survey meter checked for ...

Page 14: ...fective 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 op...

Page 15: ... 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 switches in...

Page 16: ... Parts List 7 1 Exploded Views 7 1 M8 C1 C2 C3 M5 M4 M1 M2 M27 M32 M33 M34 M35 M3 M16 M13 M14 M28 M17 M12 M20 M19 M31 M11 M22 M25 M26 M24 M23 M10 B4 B1 B1 B2 B3 M15 M7 M6 C6 C7 C5 C4 M9 M30 M29 D3 D1 D5 D6 D4 D7 D9 D10 D2 ...

Page 17: ...4x35x75mm 20mm 1 M 15 DE91 70063A ASSY HVD V2M6 PI9 0 0 05MT 1 M 16 DE91 70061B ASSY H V FUSE THV060T 0750 H 5KV0 75A RED 1 M 17 DE93 20001A ASSY BODY LATCH 2ND W1 M97G45 M9745 1 M 19 DE66 90013A LEVER DOOR POM F20 01 NTR MW5630T 1 M 20 DE26 10107B TRANS H V SHV 745EC1 1 240V 2300V 3 40V 1 M 22 DE31 10154A MOTOR DRIVE M2HJ49ZR02 ST 16 21V 1 M 23 DE71 60011A COVER MGT PP T2 0 WHT M745 1 M 24 DE47 2...

Page 18: ...ol Parts List Ref No Parts No Description Specification Q ty Remarks C 1 DE34 10007G SWITCH MEMBRANE PET W89 7 L161 KM3901T 240V50H 1 C 2 DE66 20006A BUTTON PUSH RESIN ABS HR 0370U P WHT M945 1 C 3 DE61 70076A SPRING BUTTON HSWR PI0 6 1 C 4 DE67 40002A WINDOW DISPLAY RESIN ACRYLIC T2 3 M945 IDEO 1 C 5 DE72 70003A CONTROL PANEL ABS HR 0370D WHT 171G M745 1 C 6 DE91 10403A ASSY PCB MAIN 230V50HZ NS ...

Page 19: ...X12 TOOTHED 1 CV AIR DE60 10082H SCREW A 2S 4X12 TOOTHED 2 MO FAN DE60 10082H SCREW A 2S 4X12 TOOTHED 5 PN OUT DE60 10088A SCREW TAP PH PH M3 L8 FEFZY PLAIN 2 DE60 10098A SCREW ASSY TAP TITE PH TC M4X8 SWRCH18A ZPC2 GLD W 1 CV TCO DE60 10098A SCREW ASSY TAP TITE PH TC M4X8 SWRCH18A ZPC2 GLD W 2 M DRIV DE60 10098A SCREW ASSY TAP TITE PH TC M4X8 SWRCH18A ZPC2 GLD W 2 MG TCO DE60 10098A SCREW ASSY TA...

Page 20: ...8 P C B Diagrams 8 1 P C B Diagrams 8 1 ...

Page 21: ... 8x3 2m 1 R16 2001 000290 R CARBON 10Kohm 5 1 8W AA TP 1 8x3 2mm 6 R12 R14 R19 R21 2001 000429 R CARBON 1Kohm 5 1 8W AA TP 1 8x3 2mm 4 R05 R06 R08 R09 2001 000429 R CARBON 1Kohm 5 1 8W AA TP 1 8x3 2mm 4 R10 R18 R22 R23 2001 000435 R CARBON 1Mohm 5 1 8W AA TP 1 8x3 2mm 1 R07 2001 000613 R CARBON 3 9Kohm 5 1 8W AA TP 1 8x3 2m 7 R11 R15 R17 R24 R27 2001 000780 R CARBON 470ohm 5 1 8W AA TP 1 8x3 2mm 2...

Page 22: ...L V T MAIN 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 ...

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