Samsung M1774R Service Manual Download | Manualshive

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9. Schematic Diagrams

9-1 Schematic Diagrams

9-1

Samsung Electronics

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Summary of Contents for M1774R

Page 1: ...CEManual 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 SRSC ...

Page 2: ... or inspection within the microwave generating compartments check the magnetron wave guide or transmission line and cavity for proper alignment integrity and connections d Any defective or misadjusted components in the interlock monitor door seal and microwave generation and transmission systems shall be repaired replaced or adjusted by procedures described in this manual before the oven is releas...

Page 3: ...hes interlock monitor switch 12 If the fuse is blown by the Interlock Monitor Switch Replace all of the following at the same time Primary door sensing switch and power relay 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 Alteratio...

Page 4: ...es 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 screwdrive...

Page 5: ...ONSUMPTION MICROWAVE 1 250W OUTPUT POWER FROM 100 TO 850W IEC 705 TEST PROCEDURE OPERATING FREQUENCY 2 450MHz MAGNETRON OM75SH 31 COOLING METHOD COOLING FAN MOTOR OUTSIDE DIMENSIONS 489 W x 275 H x 370 D 2 2 Comparison Chart AUTO REHEAT O AUTO COOK O POWER LEVEL O TIME SETTING AND WEIGHT O AUTO DEFROST O DEODORIZATION O ...

Page 6: ...t Button Deodorization Button Auto Reheat Cook Selection 3 Operating Instructions 3 1 Control Panel Samsung Electronics 3 1 3 2 Features External Views Door Ventilation Holes Light Safety Interlock Holes Control Panel Roller Ring Coupler Glass Plate Door Latches 489mm 275mm 370mm ...

Page 7: ...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 condition 1 Discharge the high voltage capacitor 2 Disconnect all the leads 3 Remove the mounting bolts 4 Reconnect the leads correctly and firmly 4 2 Replacement of High Voltage Transf...

Page 8: ... the figure insert and bend a thin metal plate between Door E and Door A until you hear the tick sound Insertion depth of the thin metal plate should be 0 5mm or less Insert flat screwdriver into the gap between Door A and Door C to remove Door C Be careful when handling Door C because it is fragile Then remove the door assembly 4 3 1 Removal of Door C 4 3 2 Removal of Door E Door C Door A Door E ...

Page 9: ... remount it in the correct position 8 Connect all the leads to the drive motor 9 Screw the deive motor cover to the base plate with a screw driver 10 Remount the coupler in the correct position 4 4 Replacement of Fuse 4 5 Replacement of Drive Motor Disassembly and Reassembly Screw Drive Motor Cover Base Plate Drive Motor After replacement of the defective component parts of the door reassemble it ...

Page 10: ...emove the screw securing the ground tail of the keyboard 1 Pull the lever end of the plastic fastener and remove the Flexible Printed Circuit FPC of membrane panel 2 Remove screws securing the control circuit board 3 Lift up the control circuit board from the Ass y control box 4 When reconnecting the FPC connector make sure that the holes on the connector are properly engaged with the hooks on the...

Page 11: ...nt terminal 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 Filament Terminals Secondary Terminal Primary Terminals Secondary Approx 114W Filament Approx 0W Primary Approx 1 47W Terminals Resistance 1 2 Input 1 000W 3...

Page 12: ...ust 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 fol...

Page 13: ... is finished stir the water again with the thermometer and measure the temperature T2 5 Subtract T1 from T2 This will give you the water temperature rise DT 6 The output power is obtained by the following formula 7 Normal temperature rise for this model is 9ûC to 11ûC at HIGH NOTE 1 Variations or errors in the test procedure will cause a variance in the temperature rise Additional power test shoul...

Page 14: ... 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 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 f...

Page 15: ...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...

Page 16: ...noise 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 Oven stops operation during cooking 1 Open or loose wiring of primary Adjust door and latch swi...

Page 17: ... and Parts List 7 1 Exploded Views 7 1 M1 M28 M27 M21 M29 M22 M23 M2 M24 M25 M26 M15 M14 M16 M18 M19 M20 M3 M4 M5 M6 M7 M8 M9 M10 M12 M13 M11 M17 D1 D2 D3 D4 D5 D6 D7 D8 B1 B2 B2 B3 B4 NC NO COM C2 C1 C3 C7 C5 C8 C6 C10 C13 C11 C9 C12 C4 ...

Page 18: ...EX 1 M13 DE67 60075A COUPLER PPS 7G BRN M97G45 1 M14 DE71 60457A COVER AIR PP T1 7 W115 5 L150 WHT 3RD W0 1 M15 DE26 00014A TRANS H V SHV 175EC 230V50HZ 2275V 3 40V DY 1 M16 DE61 50106A BRACKET HVC SECC T0 8 W31 L125 8 1 M17 2501 001105 C OIL 950nF 2 1KV BK 54x35x80 20 1 M18 DE59 40001A DIODE H V HVR 1X 32B 12 1 M19 DE91 70061B ASSY H V FUSE THV060T 0750 H 5KV0 75A RED 1 M20 DE61 40017A FOOT PP A3...

Page 19: ...ITE TH 3 M4 L10 SWR10 ZPC2 TOOTH 1 PCB EARTH DE60 10063A SCREW TAP TH TH M4 L12 FEFN 1 O PANEL DE60 10080A SCREW WASHER M5 L12 2S 4 HVT DE60 10080A SCREW WASHER M5 L12 2S 4 MGT DE60 10082H SCREW A 2S 4X12 TOOTHED 1 AIR COVER DE60 10082H SCREW A 2S 4X12 TOOTHED 2 B LATCH DE60 10082H SCREW A 2S 4X12 TOOTHED 4 B PLATE DE60 10082H SCREW A 2S 4X12 TOOTHED 1 C BLOWER DE60 10082H SCREW A 2S 4X12 TOOTHED ...

Page 20: ...013H BUTTON SELECT A ABS HR0370 P WHT M1774R BWT 1 C 3 DE61 70135A SPRING BUTTON PI0 6 BUTTON SELECT C RE 431 1 C 4 DE67 00003B WINDOW DISPLAY ACRYL SMOG M1774 1 C 5 DE72 00009R CONTROL PANEL ABS M1774R BWT P WHT FISH2 1 C 6 DE66 00014A BUTTON SELECT B ABS HR0370 P WHT M1774 XEF 1 C 7 DE66 00016A BUTTON CANCEL ABS HR0370 P WHT 1 C 8 DE66 20182J BUTTON START ABS 2G P WHT M1774 3RD FISH2 1 C 9 DE64 ...

Page 21: ...8 P C B Diagrams 8 1 P C B Diagrams Samsung Electronics 8 1 ...

Page 22: ...M 4 R021 R022 R023 R024 P23 2001 000290 R CARBON 10KOHM 5 1 8W AA TP 1 8X3 2MM 4 R005 R006 R007 R010 P23 2001 000290 R CARBON 10KOHM 5 1 8W AA TP 1 8X3 2MM 4 R013 R016 R031 R032 P23 2001 000290 R CARBON 10KOHM 5 1 8W AA TP 1 8X3 2MM 2 R033 R036 R037 P24 2001 000429 R CARBON 1KOHM 5 1 8W AA TP 1 8X3 2MM 4 R003 R004 R008 R028 P24 2001 000429 R CARBON 1KOHM 5 1 8W AA TP 1 8X3 2MM 4 R029 R030 R034 R03...

Page 23: ...9 Schematic Diagrams 9 1 Schematic Diagrams 9 1 Samsung Electronics ...

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