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Page 39

GLBM188HB

12 – 3

[3] Key Unit and Display Unit Circuit

Figure S-3. Key Unit and Display Unit Circuit

<NOTE>

NOT

SPECIFIED

1/10W

±5%

0.1u/50V

NOT

INSERT

PARTS

(

)

R93

R92

R91

R90

R89

R88

R87

R86

R85

R84

R83

R82

R81

R80

R79

R78

R77

R76

R75

R74

R73

R72

R71

R70

100Kx24

KRA101S

x24

C15

P15

P16

P17

SCL

SDA

P52

P53

P54

P30

P31

P32

P33

P34

P35

P36

P37

P14

P13

P12

P11

P10

P47

P46

P45

P44

P43

P42

P41

P40

P77

P76

P75

VSS

XIN

XOUT

TEST

VDD

P21

P22

RESET

P20

INT0

RXD1

TXD1

P03

SI1

SO1

SCK1

P74

P73

P72

P71

P70

P67

P66

P65

P64

P63

P62

P61

P60

AVDD

VAREF

P07

IC-3

0.1u/50V

C17

330p/50V

C16

0.1u/50V

4.7K

4.7K4.7K

270K

4.7K

R222R222

R67

R66

R65

R64

R63

P30

P10

P11

P12

P13

G10

P14

G11

P15

G12

P16

G13

P17

P31

P32

P33

P34

R42

C42

C46:

330pF

C43

C44

C45

C46

P30

P31

P32

P33

P34

R42

R46:

15K

R43

R44

R45

R46

J11

J10

2,3

P10

P11

P12

P13

P14

P15

P16

33,34

CN-J

CN-G

(CN-K)

S11B-PASK-2

13FEL2-SRTN

VFD

(B6B-XH-A)

TEST

TXD

RXD

RST

(0V)

GND

(0V)

GND

(-5V)VSS

SCK

R17

R16

R15

P17

P16

P15

P14

P13

P12

P11

P10

R22

R23

R21

15K

R24

15K

R25

R26

R27

R28

15K

10K

CF2

4MHz

R18

R19

4.7Kx3

4.7Kx2

SUB

INT

SUB

RST

Q70

Q71

Q72

Q73

Q74

Q75

Q76

Q77

Q78

Q79

Q80

Q81

Q82

Q83

Q84

Q85

Q86

Q87

Q88

Q89

Q90

Q91

Q92

Q93

P47

P46

P45

P44

P43

P42

P41

P40

P77

P76

P75

P74

P73

P72

P71

P70

P67

P66

P65

P64

P63

P62

P61

P60

KEY

UNIT

User

-O

Vent

Hi/Lo/Off

Light

Hi/Lo/Off

pco

Snacks

Auto

Cook

Summary of Contents for GLBM188HB

Page 1: ...jects generally considered acceptable in the appliance repair trade Electrolux Home Products cannot be responsible nor assume any liability for injury or damage of any kind arising from the use of this manual OVER THE RANGE MICROWAVE OVEN SERVICE MANUAL Models GLBM188HB GLBM188HS PLBMV188HC Part 316439268 Publication 5995526885 October 2008 ...

Page 2: ...ystem Test pg 18 8 Monitor Switch Test pg 18 9 Blown Monitor Fuse Test pg 18 10 Hood Thermostat Test pg 19 11 Hood Fan Motor Test pg 19 12 Touch Control Panel Assembly Test pg 19 13 Key Unit Test pg 21 14 Relay Test pg 21 15 Open PWB Fuse Procedures pg 22 16 Humidity Sensor Test pg 22 17 Noise Filter Test pg 24 CHAPTER 9 TOUCH CONTROL PANEL ASSEMBLY 25 1 Outline Of Touch Control Panel Assy pg 25 2...

Page 3: ...usted 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 released to the owner e A microwave leakage check to verify compliance with the Federal Performance Standard should be performed on each oven prior to release to the owner Before servicing an operative...

Page 4: ...ge high voltage capacitor 4 Disconnect the leads to the primary of the power transformer 5 Ensure that these leads remain isolated from other components and oven chassis by using insulation tape 6 After that procedure reconnect the power supply cord 2 When the testing is completed 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high volta...

Page 5: ...e the load of 275 15 ml 9 8 oz of tap water initially at 20 5 C 68 F in the center of the oven cavity The water container shall be a low form of 600 ml 20 oz beaker with an inside diameter of approx 8 5 cm 3 1 2 in and made of an electrically nonconductive material such as glass or plastic The placing of this standard load in the oven is important not only to protect the oven but also to insure th...

Page 6: ...htly closed B The door brackets and hinges are not defective C The door packing is not damaged D The door is not deformed or warped E There is not any other visible damage with the oven Servicing and repair work must be carried out only by trained service personnel 3 DANGER Certain initial parts are intentionally not grounded and present a risk of electrical shock only during servicing Service per...

Page 7: ... Clock 1 00 12 59 Timer 0 99 minutes 99 seconds Microwave Power for Variable Cooking Repetition Rate Full power throughout the cooking time Approx 90 of FULL Power Approx 80 of FULL Power Approx 70 of FULL Power Approx 60 of FULL Power Approx 50 of FULL Power Approx 40 of FULL Power Approx 30 of FULL Power Approx 20 of FULL Power Approx 10 of FULL Power No power throughout the cooking time Light H...

Page 8: ...rough window 2 Door hinges 3 Waveguide cover DO NOT REMOVE 4 Turntable motor shaft 5 Microwave oven light It will light when microwave oven is operating or door is open 6 Rack holders 7 Safety door latches The microwave oven will not operate unless the door is securely closed 8 Handle 9 Light Hi Lo Off pad Press the Light Hi Lo Off pad once for high twice for low and three times to turn off the li...

Page 9: ...Page 5 2 3 CONTROL PANEL ...

Page 10: ...hat it will function in the following sequence 1 When the door opens from a closed position the primary inter lock relay door sensing switch and secondary interlock switch open their contacts and then the monitor switch contacts close 2 When the door is closed from the open position the monitor switch contacts open first Then the contacts of the secondary interlock switch and door sensing switch c...

Page 11: ... very rapidly You can smell the aroma as it cooks 6 1 Cooking Sequence 1 Operate the oven in sensor cooking mode by referring to the opera tion manual NOTE The oven should not be operated on Sensor Cooking immedi ately after plugging in the unit Wait two minutes before cook ing on Sensor Cooking 2 The coil of shut off relays RY1 and RY3 are energized the oven lamp turntable motor and cooling fan m...

Page 12: ...gh Low COOK TOP LAMP N O NOTE 2 NOTE 3 NOTE 2 NOTE 5 NOTE 4 GRN CN M CN N CN D GND 120V AC 60Hz COM N O RED YLW BLK BLK PPL BLK WHT WHT NOISE SUPRESSION COIL 1 0mH LINE BYPASS CAPACITOR 3300pF 250V FUSE 20A LINE BYPASS CAPACITOR 3300pF 250V NOISE FILTER UNIT RED BLK GRY ORG SWITCH UNIT 1 BLK RED BLK BRN MAGNETRON TEMP FUSE WHT 2 3 6 3 2 4 5 1 RY5 C1 HOOD FAN MOTOR WHT RY6 RY7 BLK WHT WHT WHT BRN W...

Page 13: ...PLACED AS AN ASSEMBLY 4 THERMAL CUT OUT CAVITY This thermal cut out is located on the top of the oven cavity It is designed to prevent damage to the oven unit if the food in the oven catches fire due to overheating produced by improper setting of cook ing time or failure of control unit Under normal operation the thermal cut out remains closed However the thermal cut out will open at 293 F 145 C c...

Page 14: ...eplaced Use part FFS BA042WRKZ as an assembly IMPORTANT Whenever troubleshooting is performed with the power supply cord disconnected It may in some cases be necessary to connect the power supply cord after the outer case has been removed in this event 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Disconnect the...

Page 15: ... light with door is opened Hood fan motor operates when power cord is first plugged into wall receptacle Temperature of oven base seems more than 140ºF 60ºC because of operation of the range below But hood fan motor does not turn on automatically Normally food fan motor should be operating at mid speed Cook top lamp does not turn on when LIGHT pad is pressed Hood fan motor does not rotate at all w...

Page 16: ...ure the temperature making sure to stir the thermometer or thermocouple through the water until the maximum temperature is recorded 4 Subtract the cold water temperature from the hot water temperature The normal result should be 29 2 to 54 2 F 16 2 to 30 1 C rise in tempera ture If the water temperatures are accurately measured and tested for the required time period the test results will indicate...

Page 17: ...e of oven cavity and for improper setting of cooking time or operation of control unit Check for restricted air flow through the vent holes of the oven cavity especially the cooling fan and air guide 5 Reconnect all leads removed from components during testing 6 Reinstall the outer case cabinet 7 Reconnect the power supply cord after the outer case is installed 8 Run the oven and check all functio...

Page 18: ...y cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Before performing this test make sure that the second ary interlock switch and the primary interlock relay are operating properly according to the above Switch Test Procedure Disconnect the wire lead from the monitor switch COM terminal Check the monitor switch opera tion by using the ohmmeter ...

Page 19: ... voltage capacitor 4 If the motor does not turn touch the Vent Hi Lo Off pad once set hood fan motor power HIGH and check voltage between pins 1 and 2 Blue and Black wires of the 6 pin connector If 120 Volts appear and the hood capacitor is good replace the hood fan assembly If 120 Volts does not appear check the motor circuit The resistance values of motor terminals are as follows 5 Reconnect all...

Page 20: ...abinet and control unit cover are installed 9 Run the oven and check all functions 2 Control Unit The following symptoms indicate a defective control unit Before replacing the control unit perform the Key unit test Procedure M to determine if control unit is faulty 1 In connection with indicators a At a certain digit all or some segments do not light up b At a certain digit brightness is low c Onl...

Page 21: ...4 Re install the covers outer case cabinet and control unit cover 15 Reconnect the power supply cord after the covers outer case cabinet and control unit cover are installed 16 Run the oven and check all functions 14 N RELAY TEST 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Disconnect the leads to the primary o...

Page 22: ...her components and oven chassis by using insulation tape 7 After that procedure re connect the power supply cord 8 Follow the troubleshooting guide given below for repair 9 Disconnect the power supply cord and then remove the covers 10 Open the door and block it open 11 Discharge high voltage capacitor 12 Reconnect all leads removed from components during testing 13 Re install the covers 14 Reconn...

Page 23: ...t the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Remove the humidity sensor 5 Install the new humidity sensor 6 Reconnect all leads removed from components during testing 7 Re install the outer case cabinet 8 Reconnect the power supply cord after the outer case is installed 9 Reconnect the oven to the power supply and check t...

Page 24: ... 4W R4 1MΩ 5 1 4W Sensor Dummy Resistor Circuit 17 Q NOISE FILTER TEST 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Disconnect the leads to the primary of the power transformer 5 Using an ohmmeter check between the terminals as described in the following table If incorrect readings are obtained replace the nois...

Page 25: ...o the ini tial state when power is supplied 5 Indicator Circuit Indicator element is Fluorescent Display Basically a Fluorescent Display is triode having a cathode a grid and an anode Usually the cathode of a Fluorescent Display is directly heated and the fila ment serves as cathode The Fluorescent Display has 8 digits 16 segments are used for displaying figures 6 Power Source Circuit This circuit...

Page 26: ...such a way as to change the resistance values in parallel with P58 P62 of IC2 Chang ing the resistance values results in that there is the same potential at both F 3terminalof the humidity sensor and P66 terminal of the LSI The voltage of P65 terminal will indicate about 2 5V This initial bal ancing is set up about 32 seconds after the unit is put in the Sensor Cooking mode As the sensor cooking p...

Page 27: ...trol panel and the oven itself is so short that the two can t be separated For those models check and repair all the controls sensor related ones included of the touch control panel while keeping it connected to the oven b On some models the power supply cord between the touch control panel and the oven proper is long enough that they may be separated from each other For those models it is possibl...

Page 28: ...ture is adjusted accordingly Soldering As the melting point of lead free solder Sn Ag Cu is higher and has poorer wet ability flow to prevent damage to the land of the PWB extreme care should be taken not to leave the bit in contact with the PWB for an extended period of time Remove the bit as soon as a good flow is achieved The high content of tin in lead free solder will cause premature corrosio...

Page 29: ...ions below before operating the oven WARNING AGAINST HIGH VOLTAGE 1 Disconnect the power supply cord 2 Visually check the door and cavity face plate for damage dents cracks signs of arcing etc Carry out any remedial work that is necessary before operat ing the oven Do not operate the oven if any of the following conditions exist 1 Door does not close firmly 2 Door hinge support or latch hook is da...

Page 30: ... from transformer 8 Remove three 3 screws holding the deflector to the cavity face plate and remove the deflector 9 Remove three 3 screws holding the base cover to the cavity face plate and one 1 screw holding the base cover to the cavity back plate and remove the base cover 10 Remove two 2 screws holding the transformer to right base plate 2 Re install 1 Install by sliding the transformer on the ...

Page 31: ...nect the high voltage wire leads of the high voltage rectifier assembly from the magnetron 8 Disconnect the filament lead of the transformer from the magne tron 9 Remove the one 1 screw holding the hood duct to the fan duct and remove the one 1 screw holding the oven cavity top plate to the fan duct 10 Remove the one 1 screw holding the right base plate to the fan duct and remove the fan duct asse...

Page 32: ...ieces may be produced Do not touch the pliers to the coil of the fan motor because the coil may be cut or damaged Do not disfigure the bracket by touching with the pliers 13 Remove the fan blade from the shaft of the fan motor by pulling and rotating the fan blade with your hand 14 Now the fan blade will be free CAUTION Do not re use the removed fan blade because the hole for shaft may be larger t...

Page 33: ...vity top plate 4 Insert the cutout of stirrer cover to the tabs on the ceiling 5 Install the stirrer cover to the oven cavity and secure it by one canoe clip 15 OVEN LAMP REMOVAL 1 Disconnect the power supply cord 2 Remove the hood louver from the oven Refer to procedure of HOOD LOUVER REMOVAL 3 Lift the oven lamp cover up 4 Now the oven lamp and the socket are found 5 Screw the oven lamp off from...

Page 34: ... by moving it back and forth and up and down In and out play of the door allowed by the upper and lower position of the latch hook should be less than 0 5mm The vertical position of the latch hook should be adjusted so that the door sensing switch secondary interlock switch are activated with the door closed The horizontal position of the latch hook should be adjusted so that the monitor switch is...

Page 35: ... of gentle warm air movement around oven door is not abnormal and do not of themselves indicate a leakage of microwave energy from oven cavity Figure C 2 Door Replacement and adjustment 21 DOOR DISASSEMBLY 1 Disconnect the power supply cord and remove the oven from wall and remove outer case Refer to procedure of Removal of Oven from Wall and Outer case Removal 2 Open the door and block it open 3 ...

Page 36: ... the power supply cord 2 Remove the three 3 screws holding the deflector to the base cover 3 Remove the four 4 screws holding the base cover to the oven cavity 4 Pull down and slide to left the base cover And remove the base cover from the cavity back plate 5 Disconnect the wire leads from the lamp socket 6 Screw the oven lamp off the lamp socket 7 Screws the lamp socket off the lamp mounting angl...

Page 37: ... RELAY C9 1 1 1 1 6 12 CN L CN J CN G 11 11 FAN MOTOR WHT YLW YLW GRY WHT MONITOR SWITCH WHT GRY SECONDARY INTERLOCK SWITCH OVEN LAMP 20W TURNTABLE MOTOR TTM FM ATM OL CL CL HM COM HIGH VOLTAGE RECTIFIER HIGH VOLTAGE CAPACITOR 0 94uF 2300VAC POWER TRANSFORMER NOTES 1 Circuits subject to change without notice 2 The neutral wire White or Gray wire must be connected to the prescribed tab terminal of ...

Page 38: ...11 P12 P13 P14 SCK1 SO1 SI1 P03 TXD1 RXD1 INT0 P20 RESET P22 P21 VDD TEST XOUT XIN VSS P74 P73 P72 P71 P70 P67 P66 P65 P64 P63 P62 P61 P60 AVDD VAREF P07 C62 C63 0 1u 50V 4MHz 10K 10K 4 7K x5 Q29 Q27 Q26 Q25 Q24 Q22 Q20 C20 Q21 R51 KTA1046Y 0 Q31 IC 2 R54 R7 Q10 OUT R2 R4 8 2 47u 16V 1W Q1 C6 D5 D1 D4 D3 D2 1 D1 4 1N4002 x4 _ _ _ IN COM Q5 680 1 2W KIA79L05BP D1 D3 D2 D9 D11 D10 VP F2 F1 GND 0V GN...

Page 39: ...3 C44 C45 C46 P30 P31 P32 P33 P34 R42 R46 15K x 5 R43 R44 R45 R46 J11 J9 J10 VP F1 F2 F2 F2 2 3 5 6 7 8 9 10 11 12 13 14 15 16 17 18 20 21 P1 P2 P3 P4 P5 P6 P7 P8 P9 P10 P11 P12 P13 P14 P15 P16 1G 2G 3G 4G 5G 6G 7G 8G 23 24 25 26 27 28 29 30 33 34 F1 F1 CN J CN G CN K S11B PASK 2 13FEL2 SRTN VFD B6B XH A VC TEST TXD RXD RST VS 1 2 3 4 5 6 0V GND 0V GND 5V VSS SCK SI SO R17 R16 R15 R9 P17 P16 P15 P...

Page 40: ...4 C2 C6 D2 D1 D4 D3 Q10 R4 T1 S2 S1 P 4 1 9 8 6 5 RY5 1 7 CN B 1 11 JP15 SP JP16 CN D JP23 JP30 JP29 JP31 JP26 CN E RY2 C21 Q21 C100 JP22 JP21 DIP JP32 C10 JP2 CN F 1 3 JP1 JP6 R3 Q5 JP18 JP19 JP17 JP20 JP24 JP25 JP27 JP28 C E C B E C B E C B 1 2 R2 R1 Q1 I O CF1 6 1 1 5 RY4 RY1 RY3 RY9 RY8 RY7 RY6 R100 1 9 CN C D29 CN A VRS1 FUSE 2 5A ...

Page 41: ...Page 41 GLBM188HB 12 5 MEMO ...

Page 42: ...2 48 54 17 15 99 13 108 108 107 98 107 27 77 108 9 49 28 39 46 109 113 108 2 1 107 90 91 113 117 6 59 107 111 8 8 107 24 108 19 11 11 9 105 23 23 1 23 2 116 105 76 4 105 76 4 7 107 80 5 107 130 130 3 62 78 61 55 55 43 107 45 44 94 41 40 38 51 4 11 57 107 59 106 16 108 114 29 26 53 93 93 42 107 81 58 81 95 60 76 76 1 76 2 76 3 76 4 76 5 76 6 ...

Page 43: ...chematic diagram Lamp glass assembly Hood lamp glass ag black Lamp glass Lamp mounting angle Rear stay Base cover Lamp cover Fan duct Unit mounting plate Screw 3mm x 8mm Damper assembly Outer case cabinet PLBMV188HC GLBM188HB Outer case cabinet GLBM188HS Turntable HV capacitor band Stirrer cover Stirrer antenna assembly Roller assembly TTM packing Latch hook Harness cover Fan blade Cord bushing Ho...

Page 44: ...PLBMV188HC CONTROL PANEL PARTS 30 Power unit 31 Panel sub assembly 33 Key fixing plate 34 Screw 3mm x 8mm 35 Screw 3mm x 8mm DOOR PARTS 56 Door stopper 63 Control unit cover 64 Door sub assembly 65 Door frame assembly 68 Latch head 69 spring 71 Choke cover 72 Sealer film 73 Handle 100 Screw 4mm x 10mm 101 Special screw 118 Screw 4mm x 12mm 200 Door glass 202 Display unit 203 Control harness A 204 ...

Page 45: ...2 71 65 207 101 118 208 73 100 206 205 202 209 200 63 100 100 100 100 203 211 212 30 34 35 101 204 210 210 N O I T P I R C S E D O N 207 Key sheet 208 FPC 209 Screw 3mm x 6mm 210 Cushion MISCELLANEOUS 88 Earth wire 89 Main wire harness 2 DOOR AND CONTROL PANEL PARTS FOR PLBMV188HC ...

Page 46: ...GLBM188HS 65 Door frame GLBM188HS 65 Door frame GLBM188HB 68 Latch head 69 spring 71 Choke cover 72 Sealer film 73 Handle GLBM188HS 73 Handle GLBM188HB 100 Screw 4mm x 10mm 101 Screw 4mm x 25mm 118 Screw 4mm x 12mm 200 Door glass GLBM188HS 200 Door glass GLBM188HB 202 Display unit 203 Control harness A 204 Key fixing frame 205 Connector 206 Connector 207 Key sheet GLBM188HB 207 Key sheet GLBM188HS...

Page 47: ... Top template 87 Wall template 93 Mesh filter 95 Rack 93 76 84 85 86 87 38 95 36 82 GREASE FILTER x2 ACCESSORY ASSEMBLY CUSHION OPERATION MANUAL WALL TEMPLATE INSTALLATION INSTRUCTION TOP TEMPLATE TURNTABLE TRAY TRAY PAD TOP PAD BOTTOM PAD PACKING CASE ACCESSORY HOLDER EHP LABEL WRAP COVER Non replaceable items DOOR PROTECTOR RACK PAD PROTECTION SHEET RACK DAMPER ASSEMBLY DOOR PAD CABINET COVER ...

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