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Technical Information

22

B 890/B 990

2

Function

2.1 Heater

Circuit

The heater plate contains three heater elements within a parallel circuit
(1kW/52

ȍ

per element). (Refer to the wiring diagram.) The temperature is

regulated using an adjustable temperature control device (see the operating
manual) mounted in series before the heating elements. In addition, the
heating circuit contains two thermal hi-limit cutouts, also electrically
connected in series to the heating elements. Should the temperature exceed
392°F (200°C), the circuit will be electrically interrupted.

Figure 020-1:

Heater Electrical Circuit

Figure 020-2:

Heater Temperature Control

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Содержание B 890

Страница 1: ...TECHNICAL INFORMATION B 890 and B 990 Rotary Irons US Models 2011 Miele USA ...

Страница 2: ...r Removal 16 4 4 Transformer Replacement Base Stand Reassembly 16 4 5 Bowden Cable Replacement 17 4 6 Handle Replacement 19 020 Heater Plate 21 2 Function 22 2 1 Heater Circuit 22 2 2 Finger Guard Switch 23 3 Fault Repair 23 3 1 When Pressing the Foot Switch Roller Rotates No Heater Plate Function 23 4 Service 24 4 1 Tilting the Ironing Table Horizontally 24 4 2 Opening the Heater Plate Cover 24 4...

Страница 3: ...or 40 2 2 Control Electronic 40 3 Fault Repair 41 3 1 Noisy Operation in the Bearing Flange 41 4 Service 41 4 1 Control Electronic A1 Removal 41 4 2 Drive Shaft Removal 42 4 3 Bearing Flange Removal 42 4 4 DC Motor Removal 42 List of Figures Figure D 1 Layout of Electrical Components 9 Figure D 2 Overview of Rotary Iron 10 Figure D 3 Overview of a B 890 and b B 990 Controls 10 Figure 010 1 Main El...

Страница 4: ...30 1 Heater Plate 29 Figure 030 2 Hinge Pressure Spring Bolt and Cross Pin 31 Figure 035 1 Leaf Spring and Holder 34 Figure 040 1 Feed Board Removal 37 Figure 040 2 Roller Removal 37 Figure 050 1 Roller and Drive Components 40 Figure 050 2 Control Electronic A1 41 Figure 050 2 Screws Securing Roller Drive Motor to Frame 43 List of Tables Table C 1 US Technical Data 7 ...

Страница 5: ... disconnected from the power supply Even with the machine switched off supply voltage may be applied to some components A general visual check should always be carried out After work has been completed a touch current measurement should be carried out on all accessible conductive parts that are not connected to ground Danger There may be a risk of injury due to sharp edges Protective gloves and go...

Страница 6: ...ning When working on the appliance the table and stand may tilt together apart unintentionally and this could cause injury The ironing table and stand are linked via a tilting mechanism In its transport upright position the tilting mechanism is under tension in its working horizontal position the tension in the table spring is released Before working on the appliance tilt the ironing table into th...

Страница 7: ...nches Ironing pressure 74 lbs Temperature control Temperature regulator 86 392 F Heating time to 392 F Approx 2 min 45 sec Roller Length 32 7 Diameter w padding 6 3 Roller base material Galvanized sheet steel Roller padding Polyester needle felt Roller cover Cotton nettle cloth Roller speed 5 steps from 6 to 15 ft min Drive Roller Heater plate Motor M17 M18 24VDC 60W motors on rollers with geared ...

Страница 8: ...d be carried out by a qualified electrician in accordance with local and national safety regulations Do not connect the rotary iron to an extension cord Extension cords do not guarantee the required safety of the appliance e g danger of overheating Important If it is necessary to change the rotary iron s plug or power cord please take note of the following color codes of the wires Green Yellow Gro...

Страница 9: ... 10 Temperature control heater plate F6 5 Safety switch finger guard H1 1 On Off LED H1 5 Heating LED M17 Roller motor M18 Motor heater plate drive N2 Main electronic R1 R3 Heater elements S1 Selector switch S2 On Off switch S26 2S26 Switch heater plate off roller S27 2S27 Switch heater plate on roller T1 Transformer X2 6 Plug connector motor X3 1 Terminal block X5 X10 Coupling Z2 Interference sup...

Страница 10: ...Technical Information 10 B 890 B 990 Figure D 2 Overview of Rotary Iron a b Figure D 3 Overview of a B 890 and b B 990 Controls ...

Страница 11: ...Technical Information 11 B 890 B 990 010 Stand ...

Страница 12: ...2 separate electronic board assemblies the control electronic A1 illustrated in Section 050 2 2 and the main electronic N2 The main electronic is located beneath a cover on the top of the stand and is responsible for providing power to components See Figures 010 1 and 010 2 Figure 010 1 Main Electronic N2 B 890 ...

Страница 13: ...tand The transformer is responsible for reducing voltage from 120VAC to 24VDC for the electronic and several other components 2 3 Foot Switches 2S26 and 2S27 The foot switches are mounted below the foot plate and are actuated by the user to engage the heater plate to the roller and to provide drive to the roller assembly X1 X2 X3 X5 C1 K3 X6 K2 K1 K4 V1 C2 X4 ...

Страница 14: ... the plastic holder spring assemblies into the correct positions so that the guide pins engage in their holes 4 2 Main Electronic N2 Replacement 1 Tilt the ironing table to its horizontal position see Section 020 4 1 2 Lay the iron on its back on a mat or blanket to prevent scratching 3 Tie a sturdy cord such as twine to the J hook at the bottom of the spring 4 Release tension from the Bowden cabl...

Страница 15: ...onnect all connections from the old electronic and connect them on the new electronic one at a time This prevents incorrect connection 9 Remove the holder from the old electronic and place it on the new electronic 10 Install the new electronic with holder 11 Tilt the ironing table to its horizontal position see Section 020 4 1 12 Lay the iron on its back again 13 Ensure that the Bowden cable is ce...

Страница 16: ...ing with pliers and pull it off of the base to disengage the spring Warning With the spring disconnected movement of the ironing table will be unrestricted because there is no tension holding it in place 5 Bring the iron to its upright stowed position see the operating manual 6 Remove the main electronic s cover T20 screw from the stand Figure 010 3 Item 1 7 Remove the T20 screw securing the main ...

Страница 17: ... cable guide plastic neck on the cover pushes against the hinge after reassembly the cover can break when the iron is folded 4 5 Bowden Cable Replacement 1 Tilt the ironing table to its horizontal position see Section 020 4 1 2 Lay the iron on its back on a mat or blanket to prevent scratching 3 Tie a sturdy cord such as twine to the J hook at the bottom of the spring 4 Release tension from the Bo...

Страница 18: ...6 Item 1 13 Remove the two T20 screws securing the pulley axle to the stand Figure 010 6 Item 2 Figure 010 6 Bowden Cable Holder and Pulley 14 Remove the pulley axle pulley and entire Bowden cable spring assembly from the stand 15 Tie a sturdy cord such as twine to the J hook at the end of the spring on the new Bowden cable 16 Feed the Bowden cable pin through the round opening in the table and th...

Страница 19: ...peration by unlocking the ironing table and moving it to the stowed vertical position if binding or unusual noises occur unhook the spring and check that the Bowden cable is centered on its pulley 24 If operation is smooth re install the main electronic cover and secure it with the T20 screw Note When the cable guide plastic neck on the cover pushes against the hinge after reassembly the cover can...

Страница 20: ...he locks T20 screws Figure 010 8 Item 5 10 Release the handle by reaching inside the right side of the table and pushing up and in on the handle Figure 010 8 Item 6 11 Remove the T20 screw securing the spring holder next to Figure 010 8 Item 4 remove the spring holder and pull the handle assembly out of the right side of the table Figure 010 8 Handle Removal 12 Remove the T20 screw securing the ha...

Страница 21: ...Technical Information 21 B 890 B 990 020 Heater Plate ...

Страница 22: ...d using an adjustable temperature control device see the operating manual mounted in series before the heating elements In addition the heating circuit contains two thermal hi limit cutouts also electrically connected in series to the heating elements Should the temperature exceed 392 F 200 C the circuit will be electrically interrupted Figure 020 1 Heater Electrical Circuit Figure 020 2 Heater Te...

Страница 23: ...itch Roller Rotates No Heater Plate Function Symptom After the foot switch is pressed the roller rotates but the heater plate does not move up or down Cause Microswitch defective Remedy 1 Check the foot switch 2S26 2S27 2 Check the heater plate microswitch S26 S27 Cause The heater plate microswitch S26 S27 is not adjusted correctly Remedy Adjust the heater plate microswitch S26 S27 through the mou...

Страница 24: ...lly Figure 020 4 Handle Locking Catch 1 Lift the handle locking catch at the right under the table and hold the table Figure 020 5 Locking the Iron in Place 2 Tilt the ironing table until it is horizontal and locks into place 4 2 Opening the Heater Plate Cover 1 Tilt the ironing table to its horizontal position see Section 020 4 1 2 Switch on the machine 3 Operate the foot switch to lower the heat...

Страница 25: ... the electrical connections 3 Use a screwdriver to bend open the channels holding the heater element in the heater plate 4 Remove the heater element 5 Install the new heater element 6 Use a hammer and chisel to carefully close the channels in the heater plate to secure the heater element back into place Warning Take care not to indent the heater element outer covering as the internal heating condu...

Страница 26: ...When closing the channels take care not to damage the temperature sensor 10 Reassemble by following these instructions in reverse order 11 Check for correct operation 4 6 High Temperature Cutout 2B2 10 3B2 10 Replacement 1 Remove the insulation matting see Section 020 4 3 2 Disconnect the electrical connections from the appropriate high temperature cutout 3 Use a screwdriver to bend open the chann...

Страница 27: ...ng point of the finger guard strip cannot be modified 1 Open the heater plate cover see Section 020 4 2 2 Remove the 2 T10 screws from the switch holder See Figure 020 7 Item 1 3 Disconnect the switch connection See Figure 020 7 Item 2 4 Remove the switch Figure 020 7 Finger Guard Switch 1 2 ...

Страница 28: ...Technical Information 28 B 890 B 990 030 Heater Plate Motor ...

Страница 29: ...ater plate to close against the roller Power to the motor is interrupted as the guide strip actuator contacts the plate on roller switch Figure 030 1 Item 2 leaving the heater plate against the roller for ironing When the user releases the foot pedal the drive motor is energized in the opposite direction The eccentric cam rotates pressure is released from the spring and the heater plate moves away...

Страница 30: ... cam See Figure 030 1 Item 4 5 Unsnap the strips from the motor bracket then tilt them slightly and remove them 6 Disconnect the Molex connection from the DC motor 7 Remove the E clip securing the shaft to the cam Figure 030 1 Item 5 8 Remove the four T20 screws securing the motor bracket to the table top screws are shown in Figure 010 6 Item 3 Note There is a wire loop at the base of the motor th...

Страница 31: ...to the end of the bolt 6 Screw the bolt in so that the pressure spring is compressed to a length of approximately 1 3 16 inches Figure 030 2 Hinge Pressure Spring Bolt and Cross Pin Note After correct setting the gap between the bolt head and the cross pin at the head of the bolt should be approximately 1 16 of an inch with the heater plate lowered onto the roller 1 2 ...

Страница 32: ...Technical Information 32 B 890 B 990 035 Lifting Arm ...

Страница 33: ...ter plate cover see Section 020 4 2 2 Remove the insulation matting see Section 020 4 3 3 Release the emergency release pull the handle upwards 4 Remove only one of the larger E clips securing the holder assembly to the lifting arm Figure 035 1 Item 1 5 Remove the washer underneath the E clip 6 Slide the hinge pin out of the lifting arm Figure 035 1 Item 2 7 Remove the wiring harness retaining cli...

Страница 34: ...Technical Information 34 B 890 B 990 Figure 035 1 Leaf Spring and Holder 4 1 2 3 ...

Страница 35: ...Technical Information 35 B 890 B 990 040 Roller ...

Страница 36: ...rn Cause DC motor defective Remedy Check the DC motor See Section 050 4 4 If the DC motor is in order check the main electronic See Section 010 4 2 Cause Surface defects nicks or grooves on the shaft of the free wheel mechanism Remedy Replace the drive shaft see Section 050 4 2 3 4 Roller Stops or Heater Plate Does Not Start Symptom This fault first occurs after a short operating period and after ...

Страница 37: ... 1 3 Remove the hanging rail 4 Open the ironing cloth at the drawstring end Complete removal of cloth is not necessary Figure 040 2 Roller Removal 5 Pull off the roller end cap Figure 040 2 Item 1 Note Adhesive residue may make it difficult to remove the end cap 6 Remove the retaining screw T30 and washer Figure 040 2 Items 2 and 3 from the interior of the roller 7 Remove the roller from the rolle...

Страница 38: ...en replacing the end cap ensure that its notch aligns with the tab on the interior of the roller See Figure 040 2 Item A 4 2 Ironing Cloth Replacement See the operating instructions Note When changing the ironing cloth the roller must be cold ...

Страница 39: ...Technical Information 39 B 890 B 990 050 Roller Motor ...

Страница 40: ...e foot plate refer to Section 010 2 3 Speed control is via a 5 stage switch Figure 050 1 Roller and Drive Components A Free wheel retainer screws 3 B Roller retaining screw 1 2 2 Control Electronic The B 890 and B 990 are equipped with two 2 separate electronic board assemblies the main electronic N2 illustrated in Section 010 2 1 and the control electronic A1 The control electronic is attached to...

Страница 41: ...1397 a new control panel was installed The old control panel mat no 5056071 must always be replaced with an old version and the new panel mat no 5368000 must be replaced with a new version 1 Tilt the ironing table to its horizontal position see Section 020 4 1 2 Lever off the switch knob using a lid opener or yellow Miele tool 3 Remove the T20 screw from the rear of the control electronic cover 4 ...

Страница 42: ...f the drive shaft next to the gear 8 Remove the shaft from the gear by pulling the shaft away from the appliance 9 Remove the gear from the appliance 4 3 Bearing Flange Removal 1 Remove the DC motor see Section 050 4 4 2 Remove the flange retaining screw T30 from the motor bracket 3 Remove the flange Note Do not apply lubricant when re installing 4 4 DC Motor Removal 1 Tilt the ironing table to it...

Страница 43: ...ion 43 B 890 B 990 Figure 050 2 Screws Securing Roller Drive Motor to Frame 10 Remove the motor partially by lifting it upward 11 Disconnect the wiring harness from the motor 12 Lift the motor completely out of the frame ...

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