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8

MEASUREMENT OF THE MICR

OWAVE OUTPUT PO

WER

Microwave output power can be checked by indirectly measuring the temperature rise of a certain amount of water
exposed to the microwave as directed below.

Procedure

1. Microwave power output measurement is made with the microwave oven supplied at rated voltage and operated

at its maximum microwave power setting with a load of 1,000±5cc of potable water.

2. The water is contained in a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm

and an outside diameter of approximately 190 mm.

3. The oven and the empty vessel are at ambient temperature prior to the start of the test.

The initial temperature of the water is 10±2˚C(50±3.6˚F).
It is measured immediately before the water is added to the vessel. After addition of the water to the vessel, the
load is immediately placed on the center of the shelf which is in the lowest normal position.

4. Microwave power is switched on.

5. Heating time should be exactly 52 sec.(KOR-61A5) or 47

sec.(KOR-81A5).

Heating time is measured while the microwave generator is
operating at full power.
The filament heat-up time for magnetrons is not included.

6. The initial and final water temperatures are selected so that the

maximum defference between the ambient and final water
temperature is 5K.

7. The microwave power output P in watts is calculated from the following formula:

•

∆

T is actual temperature rise.

• t is the heating time.
The power measured should be 800W(KOR-61A5)±10% or 900W(KOR-81A5)±10%.

CAUTION :

1. Water load should be measured exactly to 1 liters.
2. Input power voltage should be exactly 230 volts as specified.
3. Ambient temperature should be 20±2˚C (68±3.6˚F)

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Water Load

Tray

P = 4187 X

∆

T/t

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Summary of Contents for KOR-61A5

Page 1: ...Service Manual Microwave Oven Model KOR 61A5 DAEWOO ELECTRONICS CO LTD ...

Page 2: ...g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g g e e g ...

Page 3: ...e e e e e e e e e e e e e e e e e e e e e e e e e e g g g g g g 1 For Safe Operation Damage that allows the microwave energy that cooks or heats the food to escape will result in poor cooking and may cause serious bodily injury to the operator IF ANY OF THE FOLLOWING CONDITIONS EXIST OPERATOR MUST NOT USE THE APPLIANCE Only a trained service personnel should make repairs 1 A broken door hinge 2 A ...

Page 4: ...UMPTION 1200W MICRO WAVE OUTPUT POWER 800W FREQUENCY 2450 MHz OUTSIDE DIMENSIONS WXHXD 465 X 274 X 374 mm CAVITY DIMENSIONS WXHXD 290 X 200 X 290 mm NET WEIGHT 13 5Kg TIMER 35 min DUAL SPEED POWER SELECTIONS 5 LEVELS SPECIFICATIONS Specifications subject to change without notice For KOR 81A5 ...

Page 5: ...em Door Viewing Screen Allows viewing of food the screen is designed so that light can pass through but not the microwave Glass Cooking Tray Made of special heat resistant glass Food in a proper receptacle is placed on this tray for cooking Roller guide This must always be used for cooking together with the glass cooking tray Knob V P C Used to select a microwave power level Knob timer Used in set...

Page 6: ...e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e g g g g g g CAUTION Maintenances works like the replacing of the power cable must be made by a technician qualified of the after sales services e e h h h h h h e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e ...

Page 7: ...timer setting 2 Various clicking noises may be heard when turning the V P C Knob This is normal and does not affect the operation of your microwave oven e e h h h h h h e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e g g g g g g...

Page 8: ...vessel the load is immediately placed on the center of the shelf which is in the lowest normal position 4 Microwave power is switched on 5 Heating time should be exactly 52 sec KOR 61A5 or 47 sec KOR 81A5 Heating time is measured while the microwave generator is operating at full power The filament heat up time for magnetrons is not included 6 The initial and final water temperatures are selected ...

Page 9: ... ASSY TIMER SWITCH V P C NO COM INTERLOCK MONITOR SWITCH NC BK WH BL SECONDARY INTERLOCK SWITCH WH GY GY GY GY GY GY OR MAGNETRON 1 3 2 M RD OR NOTE RD RED NOTE WH WHITE NOTE BK BLACK NOTE GN GREEN NOTE BR BROWNNOTE OR ORANGE BL BLUE GY GRAY GE GREEN YELLOW CL CAVITY LAMP FM FAN BLOWER MOTOR GM GEARED MOTOR TM TIMER MOTOR V P C VARIABLE POWER CONTROLLER CONDITION DOOR CLOSED TIMER ON V P C HIGH NO...

Page 10: ...MER SWITCH V P C NO COM INTERLOCK MONITOR SWITCH NC BK WH BL SECONDARY INTERLOCK SWITCH WH GY BL GY GY GY GY RD RD MAGNETRON 1 3 2 M RD BK NOTE RD RED NOTE WH WHITE NOTE BK BLACK NOTE GN GREEN NOTE BR BROWNNOTE OR ORANGE BL BLUE GY GRAY GE GREEN YELLOW CL CAVITY LAMP FM FAN BLOWER MOTOR GM GEARED MOTOR TM TIMER MOTOR V P C VARIABLE POWER CONTROLLER CONDITION DOOR CLOSED TIMER ON V P C HIGH NOTE H ...

Page 11: ...gh voltae transformer and this secondary voltage is increased by the action of the diode and the charging of the high voltage capacitor This resultant D C voltage is then applied to the anode of the magnetron As shown in Fig 2 the first half cycle of the high voltage produces in the high voltage transformer secondary charges the high voltage capacitor Current flow is in the direction of the dotted...

Page 12: ...age to the high voltage transformer to stop microwave oscillation Fan motor timer motor and turntable motor stop rotating Oven lamp turn off As soon as the door is opened monitor switch close NC to create the short circuit If the contacts of primary interlock switch and secondary interlock switch are both malfunction the 12A fuse blows open due to the large current surge caused by monitor switch a...

Page 13: ... 4 When the 12A fuse is blown out due to the operation of the monitor switch replace primary secondary interlock switch and monitor switch Refer to next page for the necessary adjustment 5 After repair or replacement of parts make sure that the screws are properly tightened and all electrical connections are tightened 6 Do not operate without cabinet CAUTION Service personnel should remove their w...

Page 14: ...ity 3 Remove the stopper hinge top Łfrom door assembly 4 Reverse the above for reassembly taking care to replace fixing glue 3 To remove door parts NOTE After replacing the door preform a check of correct alignment with the hinge and cavity front face e e h h h h h h e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e ...

Page 15: ...screws 3 To reduce gap locatated on part C See Fig A 1 Loosen a screw on the interlock switch assembly located at the bottom of the oven body 2 Draw the interlock switch assembly inward as possible to engage with hook on the door bottom 3 Tighten a screw 4 To reduce gap located on part D See Fig B 1 Loosen a screw on the interlock switch assembly located at the top of the oven body 2 Follow step 3...

Page 16: ...PC knob B01 and the flat spring B03 from the control panel B02 4 Remove two screws B08 which secure the timer ass y B07 5 Pull out the knob B09 from the timer ass y B07 6 Remove the timer ass y B07 7 Pull out the timer coupler B06 from the timer ass y B07 8 Remove the door open button B12 and button spring B11 from the control panel B02 9 Remove the door open lever B10 from the control panel B02 1...

Page 17: ...or holder Ø 2 Remove the H V diode Ł from the capacitor holder Ø 3 Reverse the above steps for reassembly High voltage circuit wiring 7 To remove magnetron 1 Remove three screws which secure the magnetron Ł 2 Remove the magnetron Ł 3 Reverse the above steps for reassembly 1 3 2 2 1 MAGNETRON H V CAPACITOR H V DIODE H V TRANSFORMER ...

Page 18: ...agnetron to prevent microwave leakage Whenever repair work is carried out on magnetron check the microwave leakage It shall not exceed 4mW cm2 for a fully assembled oven with door normally cosed e e h h h h h h e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e...

Page 19: ...sed the hook locks the oven door If the door is not closed properly the oven will not operate When the door is closed the hook pushed the button of themicro switch Then the button of the primary interlock switch bring it under on condition Adjustment 1 When the door is closed the switch button is pushed by the hook The movement of the switch button should exceed 1 2mm measured at the top of the bu...

Page 20: ... e Completely tighten the two mounting screws 4 Interlock switch resplacement Whenever safety interlock switch are replaced 1 Refer to the following diagram 2 Check the connection of monitor switch after replacement 3 Pereform the electrical continuity check of interlock switches and microwave emission test mentioned in this manual Interlock monitor switch Secondary interlock switch Hook Push leve...

Page 21: ...e at the same time Replace H V T Thermal cut out Outlet has Proper voltage Check continuity of H V T Thermal cut out Check continuity of power supply cord Replace high voltage transformer Replace high voltage Capacitor Replace primary secondary interlock switch and interlock monitor switch Replace primary secondary inter lock switch and interlock monitor switch NO NO NO continuity Both continuity ...

Page 22: ...rmal directions Do not operate when you check this continuity Normal reading should be approx 0Ω Meter with 6V or higher voltage batteries should be used to check the normal direction resistance of the diode NO GOOD Poor continuity Check the insulation of filament winding of high voltage transformer Faulty magnetron GOOD NO Replace or repair oven lamp turntable motor NO continuity NO continuity co...

Page 23: ...R 81A5 Approx 110Ω 10 KOR 61A5 Filament winding Approx 0Ω Primary winding Approx 0Ω 2 High voltage capacitor A Check continuity of capacitor with meter on the highest OHM scale B A normal capacitor will show continuity for a short time and then indicate 9MΩ once the capacitor is charged C A shorted capacitor will show continuous continuity D An open capacitor will show constant 9MΩ E Resistance be...

Page 24: ...zero resistance ohmmeter Fig a Condition 1 Door is opened 2 Common terminal of the monitor switch disconnected 3 In case of secondary interlock switch ohmmeter Fig c Condition 1 Door is closed 2 In case of primary interlock check Lamp on or zero resistance ohmmeter Fig b Condition 1 Door is closed ƒN Schematic diagram of S W tester POWER SUPPLY CORD POWER SUPPLY CORD PRIMARY INTERLOCK S W PRIMARY ...

Page 25: ...ABS H 2938 XR 401 1 KOR 61A5 A02 BARRIER SCREEN O 3517003070 PETP T0 188 1 KOR 61A5 A03 STOPPER HINGE T AS 3515201500 KOR 61150S 1 A04 DOOR PAINTING AS 3511706100 KOR 61150S 1 KOR 61A5 A05 BARRIER SCREEN I 3517002800 POLYESTER T0 1 1 KOR 61A5 A06 GASKET DOOR 3512300200 PP 1 KOR 61A5 A07 HOOK 3513100700 POM 1 A08 SPRING HOOK 3515101300 PW1 1 ...

Page 26: ...15101600 SUS 301 T0 5 1 B04 COUPLER VPC KNOB 3517400500 POM 1 B05 SCREW TAPPING 7122401211 T2S TRS 4X12 PW MFZN 1 B06 COUPLER TIMER 3517400400 POM 1 B07 TIMER 3518203800 KN35MKD 24E P 1 B08 SCREW TAPPING 7122401211 T2S TRS 4X12 PW MFZN 2 B09 KNOB 3513402580 ABS H 2938 XR 401 1 B10 LEVER DOOR OPEN 3513701420 ACETAL 1 B11 SPRING BUTTON 441G430171 SWP DIA 0 7 1 B12 BUTTON DOOR OPEN 3516903650 ABS H 2...

Page 27: ...27 3 Main Unit KOR 61A5 ...

Page 28: ...72400811 7112401011 7112401011 7112401011 3516003700 7122401211 TAPPING TAPPING TAPPING TAPPING TAPTITE TAPPING 3516002700 3 8 TRS 13 3 3 8 3 TRS 6 B TAPTITE TAPPING HEX S 1 1 KOR 61A5 KOR 61A5 KOR 61A5 KOR 61A5 KOR 61A5 KOR 61A5 KOR 61A5 KOR 61A5 3516718500 3511707990 KOR 61A50S KOR 61A50S ...

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