Miele G 7881 Service Manual

4 Service
4.1 Coarse Filter Replacement
AOpen the detergent pullout drawer.
ALoosen the two upper retaining screws (095 Fig. 3, Pos. 1) and tilt them
upwards.
ATilt the coarse filter housing (095 Fig. 3, Pos. 2) forwards and lever it free of
the lower retainers (095 Fig. 3, Pos. 3).
APress down on the center tab to open the door of the filter housing and
remove the perforated plate.
ARemove the coarse filter and install a new one. The smooth filter surface must
face towards the rear.
AInstall the...

4.2 Removing Potentiometer 1R32
AOpen the left drawer.
ARemove the drying unit fascia retaining screws, 095 Fig. 2, Pos. 4.
ARemove the drying unit fascia. Disconnect the connection plug for the
potentiometer, 095 Fig. 2, Pos. 2.
ARemove the holder bracket with potentiometer.
ARemove the potentiometer locknut.
AReassemble by following these instructions in reverse order.
4.3 Removing the Drying Unit Container
x
Fig. 4:Drawer Guide with Lever
ADisconnect the unit from the power supply.
AClose the door....

4.4 Microfine Filter Replacement
x
Fig. 5:Drying Unit Container with Filters
AOpen the detergent pullout drawer.
ARemove the coarse filter housing as outlined in Coarse Filter Replacement,
095 4.1, Steps 2 and 3.
ARemove the microfine filter. See 095 Fig. 5. Install a new microfine filter.
x
Note
When re-installing, ensure that the filter rubber seal is properly seated on the
holder in the drying unit container. To secure the filter turn both retainers
simultaneously towards the filter.
AReplace the...

096 Drying Unit, Electrical Details
G 7882 CD, G 7883 CD
1 Technical Data
x
Stage 1 (basic load) 700W
Stage 2 (controlled load) 1100W
Table 1:Heater Bank R16 Data
Descriptive Technical Documentation
DTD no. 62-7881 096-1
18.09.2013, US_am This information should not be duplicated or passed on without Miele approval. All rights reserved. 

2 Function
2.1 Fan Motor M2
The fan is a 240VAC series-wound motor with brushes. The maximum speed is
23000 rpm. A thermal cut out for winding protection is integrated in the motor, and
will reset automatically a few seconds after it has tripped.The brushes and
winding protection cannot be replaced separately.When the brushes are
worn out (after approximately 2500 hours of operation), the motor remains
stationary and must be replaced.
2.2 Fan and Heater Bank Control
add pic 6002991
1 Position of terminal...

x
Fig. 2:TA-7 Drying Unit Control Wiring Diagram
The control for the fan and heater bank is under the base insert of the drying unit
container. The live supply L for fan M2 and heater bank R16 is from terminal 1 of
plug connector X5/2 via the make contact of relay 1K1/3. The 2-stage heater
bank, 096 Fig. 7, Pos. 2, has a basic and a controlled load (heater element). The
basic load is activated via electronic relay K1/1. Temperature limiter F2 limits the
heater power of the heater bank. It trips and opens...

3 Fault Repair
3.1 Drying Unit Fan and Heater Bank Inoperative
Cause
Supply voltage not present at plug contacts 1 and 2 (plug connector X5/2).
Remedy
ACheck the voltage supply to the drying unit at plug connector X5/2, plug
contacts 1 (L) and 2 (N).
AIf no voltage is present, check other plug contacts and connections in
accordance with the wiring diagram. L1 and N are applied to the drying unit
via main switch S2 and door switch 1S4.
Cause
Relay 1K1/3 not activated.
Remedy
AIn the service mode, 070...

3.2 Drying Unit Fan Does Not Start
Cause
Fan motor winding defective.
Remedy
ASee Replacing Electronic Components Under the Base Insert, 096 4.3.
ACheck motor winding for continuity with an ohmmeter.
AReplace the fan, if necessary.
Cause
Fan motor brushes worn out (life approximately 1000 hours).
Remedy
AFan Motor Removal, 096 4.1.
Cause
Fan thermal cutout defective.
Remedy
AFan Motor Removal, 096 4.1.
Cause
Speed control N1 defective.
Remedy
ARemove the base insert; see Replacing Electronic Components...

3.3 Drying Unit Fan Operates Too Slowly
Cause
Potentiometer 1R32 defective or plug connections open-circuited.
Remedy
ACheck the potentiometer and its connections; see Removing Potentiometer
1R32, 095 4.2.
AReplace the potentiometer, if necessary.
3.4 Air From Drying Unit Is Not Warm
Symptom
Heater bank in drying unit container inoperative.
Cause
Thermostat has no continuity.
Remedy
ACheck thermostat for continuity with an ohmmeter; see Replacing Heater
Bank Thermostat F2, 096 4.5.
AReplace the...

AIf voltage is present, remove the base insert; see Replacing Electronic
Components Under the Base Insert, 096 4.3.
ACheck relay 2K1/3, 096 Fig. 1, Pos. 6 (contacts, continuity, solenoid, etc.).
AReplace the relay, if necessary.
3.5 Drying Temperature Not Reached
Cause
Relay K1/1 (controlled load) not activated.
Remedy
AIf no voltage is present, disconnect plug 13 and check output 14 in service
mode, 070 2.9.4S 24, Checking Outputs 12 - 19.
AIf voltage is still not present, check the voltage supply for...