Miele S171i Bedienungsanleitung

Service Manual

Vacuum Cleaner

MODELS S171i / S172i



Technical Information

S171 i / S172 i

Table of Contents Page

1. Construction and Design 2

1.1 Features 2

1.2 Technical Data 2

1.3 Accessories 3

2. Service and Maintenance

2.1 Belt Replacement 4

2.2 Brush Roller Replacement 4

2.3 Bulb Replacement 4

2.4 Replacement of Beater Bar Selector 5

2.5 Motor Replacement 6

2.6 Carbon Brush Replacement 6

2.7 Thermal Fuse Replacement 6

2.8 Power Cord Replacement 7

2.9 On-Off Switch Replacement 7

2.10 Power Control Replacement 8

2.11 Potentiometer Replacement 8

2.12 Troubleshooting Guide 9

9.0 Wiring Diagrams

9.1 S171i 10

9.2 S172i 11

10. Parts List 12 - 17

Technical Information

S171 i / S172 i

1.0 Construction & Design

1.1 Features

Features S171I S172I

Variable Motor Speed •

••

•

Automatic Cord Rewind •

••

•

Change Bag Indicator •

••

•

Bare Floor Adjustment •

••

•

Double Beater Bar •

••

•

Double Beater Brush •

••

•

Headlight •

••

•

Brush Edge Cleaning •

••

•

Micron Filtration •

••

•

Integrated Tool Storage •

••

•

1.2 Technical Data

1.2.1 Water Lift 49.2 inches

1.2.2 Air Flow 50 CFM

1.2.3 Dust Bags 2 ply recyclable paper

1.2.4 Dust Bag Volume 6 quarts

1.2.5 Operational Radius 25 feet standard

34 feet with Extension

1.2.6. Weight S171i - 13.7 lbs

S172I - 14.1 lbs

1.2.7 Electrical Connection 120 Vac, 60 Hz

1.2.8 Rated Load 800 Watts

1.2.9 Motor Power 7.3 Amp

1.2.10 Safety Classification Double Insulated

1.2.11 Safety Certification ETL 9700717

1.2.12 Cord Length 24.9 feet

1.2.13 Change Bag Indicator Both S171I & S172I

1.2.14 Brush Roll Both S171I & S172I

1.2.15 Filtration Pre Motor Filtration, Electrostatic Super

Clean Filter

Technical Information

S171 i / S172 i

1.3 Accessories

1.4 Standard Accessories Extension Wand

Crevice Tool

Dusting Brush

Technical Information

S171 i / S172 i

2.0 REPLACING THE MAIN PARTS

IMPORTANT: BEFORE REPLACING ANY PART

ALWAYS UNPLUG THE VACUUM FROM THE

ELECTRICAL SUPPLY.

2.1 REPLACING THE BELT

1. Loosen the 4 screws from the base plate and

remove base plate. (Fig. 1)

2. Release the belt from the motor shaft and then

lift up the rotary brush assembly to remove the

belt. (Fig. 2)

3. Install the new belt around the pulley and motor

shaft.

4. Re-install the base plate and tighten the screws.

2.2 REPLACING THE ROTARY BRUSH

ASSEMBLY

1. Remove the base plate and rotary brush

assembly as outlined in Section 2.1.

2. Install the new assembly by first installing the

belt around the pulley and placing the brush

ends into their holders. Next, pull the belt over

the motor shaft. (Fig. 3)

3. Re-install the base plate and tighten the screws.

2.3 REPLACING THE BULB

1. Remove the base plate as outlined in Section

2.1.

2. Release the fastening flange and lift the

complete head-light assembly out of the

vacuum. (Fig. 4)

3. Pull out the bulb and replace it with a new one.

(Fig. 5)

4. Press the headlight assembly back into place.

5. Re-install the base plate and tighten the screws.

Technical Information

S171 i / S172 i

2.4 REPLACING THE BEATER BAR

SELECTOR

1. Remove the base plate as outlined in section

2.1.

2. Release the belt from the motor shaft.

3. Loosen the screw holding the lever selector,

two holding the fixing lever selector and one

holding the spring button selector. (Fig. 6)

4. Replace any damaged parts and re-assemble

in the reverse order.

2.5 REPLACING THE MOTOR

1. Remove the base plate as outlined in section

2.1.

2. Release the belt from the motor shaft.

3. Remove the screw holding the pedal and

the two holding the frame. (Fig. 7)

4. Insert a flat-head screwdriver at the nozzle

housing and carefully pry out the plastic shaft.

Remove the floor nozzle cover.(Fig. 8)

5. Turn the vacuum cleaner over and remove the

four screws from the upper body. (Fig. 9)

6. Take out the motor and remove the two lead

wires (provided with quick-terminals) from

the carbon brush holder terminals. (Fig. 10)

7. Dismount the front / rear motor supports and

replace the motor. (Fig. 11)

8. Assemble the front / rear motor supports on to

the new motor and connect the two lead

wires to the carbon brush holder terminals.

9. Place the motor in the lower body and re-

install the rest of the parts in reverse

order.

2.6 REPLACING THE CARBON BRUSHES

Technical Information

S171 i / S172 i

1. Remove the motor as outlined in

section 2.5.

2. Bend the metal end of the carbon brush

holder so it is out of the way and pull out the

carbon brush. (Fig. 12)

3. Cut off the metal end of the carbon brush

holder. (Fig. 13)

4. Insert a new carbon brush into the brush

holder and push it in until the protruding pins of

the new metal end latch into the notches of the

brush holder. (Fig. 14)

5. Connect the two wires to the carbon

brush holder terminals and replace the

motor in the lower body.

6. Re-install the rest of the parts in reverse

order.

2.7 REPLACING THE THERMAL FUSE

1. Remove the upper body as shown in Fig.9

of page 5.

2. Remove the wire nut and disconnect the

thermal fuse from the carbon brush holder

terminal. (Fig. 15)

3. Replace the thermal fuse and connect it

as shown in the wiring diagram.

4. Re-assemble in the reverse order.

Technical Information

S171 i / S172 i

2.8 REPLACING THE POWER CORD

1. Loosen the two screws from the switch cover

and remove cover. (Fig. 16)

2. Remove the two screws from the cord stopper.

(Fig. 17)

3. Disconnect the blue and brown wires from the

terminal block to the power cord. (Fig. 18)

4. Replace the power cord and secure the new

cord using the cord stopper. Then connect the

wires to the terminal block according to the

wiring diagram.

5. Re-install the switch cover and tighten the two

screws.

2.8 REPLACING THE ON/OFF SWITCH

1. Remove the switch cover as outlined in section

2.8.

2. Disconnect the two wires (provided with

quick- terminal) from the ON/OFF switch

terminals. (Fig. 19)

3. Replace the ON/OFF switch and connect the

two wires according to the wiring diagram.

2.10 REPLACING THE POWER CONTROL

Technical Information

S171 i / S172 i

AND POTENTIOMETER (S172i)

1. Remove the switch cover as outlined in section

2.8

2. Press the two clamps holding the power control

unit in it’s housing and remove. (Fig. 20)

3. Disconnect the yellow and black wires from

the power control.

4. Unsolder the gray wire that is connected to the

potentiometer and remove the power control.

(Fig. 21)

5. Install the new power control, solder on the gray

wire and reconnect the black and yellow wires

according to the wiring diagram.

2.11 Potentiometer

1. Remove the switch cover as outlined in section

2.8.

2. Pull out the power control unit and remove the

potentiometer from its support. (Fig. 22)

3. Unsolder the yellow and gray wires from the

potentiometer tabs. (Fig. 23)

4. Replace the potentiometer and solder the

yellow and gray wires to their respective tabs.

NOTE: MAKE SURE THE WIRES ARE IN

THE CORRECT POSITION BEFORE

SOLDERING.

Technical Information

S171 i / S172 i

CONDITION

Motor fails to operate

(no noise is heard

at all).

CHECK POINT

Power cord

Motor continuity

Carbon brush not

contacting the

commutator

ON / OFF Switch

Power control

Thermal fuse

METHOD OF INSPECTION

Check power cord continuity.

Check continuity of motor and lead wires.

Check if there is gap between

carbon brush and commutator.

Check continuity across the switch

terminals.

Short-circuit yellow and black lead wires from the

power control and connect the vacuum cleaner.

Check thermal fuse continuity.

CAUSE/REMEDY

If there is no continuity, replace

it.

If there is gap between carbon

brush and commutator, replace

both carbon brushes.

If there is no continuity, replace

the switch.

If the motor works, replace the

power control.

If there is no continuity, replace

it.

Motor runs but no

suction

Hose or suction

pipe

Dust bag or central

filter

Check for clog in hose or suction pipe.

Check if dust bag or central filter is clogged or full.

If there is a clog, remove it.

If the paper bag is full, replace

it. If central filter is dirty clean or

replace it

Noise or vibration

Motor fan

Carbon brushes

Rotary brush

(bearing

support A-B).

Rotary brush

(bearings)

Check for dust accumulated in motor fan (It could

happen if the vacuum has been used with a

broken dust bag or without a filter).

Check for uneven wear of carbon brushes.

Remove the rotary brush assembly and check if

bearing support A-B is broken or

deformed.

Place the rotary brush assembly on a flat surface

and turn the rotary brush to check for bearing

noise or clearance.

In this case, replace the motor

and check filter condition (never

dismantle the motor fan).

Replace carbon brushes (be

sure to change both).

If bearing support A or B is

defective, replace it.

If there is bearing noise or

clearance, replace the rotary

brush assembly.

Rotary brush does

not turn

Belt

Beater bar selector

Remove the base plate and check if the

belt is broken or loose.

Remove the base plate and check if the lever

selector changes position.

If the belt is broken, replace it. If

loose, re-install it.

If the lever selector does not

change position, replace it.

Rotary brush does

not stop.

Pulleys

Beater bar selector

Remove base plate and check if the two pulleys

are blocked or out of position.

Remove the base plate and check if the

lever selector changes position.

If the two pulleys are blocked,

replace the rotary brush

assemble.

If the lever selector does not

change position, replace it.

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