Miele G 7881 Service Manual

							x
Note
The pump is only being ventilated successfully when the air bubble in the hose
advances continuously. If the air bubble falls or retreats during pumping breaks,
a leak may exist in the system.
Cause
Leak in suction hose.
Remedy
ACheck the hoses and connections for porous sections, leaks and correct
positioning.
3.3 No Voltage at DOS G 60 Dispenser Module
Cause
Voltage supply interrupted or not present.
Remedy
ACheck the programming. Ensure that the DOS dispenser module is activated.
ACheck 5-pin plug for correct seating.
ACheck leads for open circuits (ohmmeter).
ACheck the voltage supply at ELZ electronic module, contact 2 (M9/7), 080 Fig.
1, plug 14.
ACheck the voltage supply for ELZ electronic module, contact 3, 080 Fig. 1,
plug 13.
Descriptive Technical Documentation
091-8 DTD no. 62-7881
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							4 Service
4.1 Installation and Commissioning of DOS Dispenser Module
x
Warning!
Before shipping the dispensing module, the system functions were factory-
tested with glycerin. In order to avoid faults or polluting the machine with glycerin
residue,always observethe following steps.
•Remove all caps from the dispensing hoses and the DOS module.
•After connecting the hoses and installing the dispensing module,
thoroughlyflush the entire system with warm water.
Fig. 6:DOS G 60 Dispenser Module in Base Unit
Fig. 7:Wall-Mounted DOS G 60 Dispenser Module
AInsert the 5-pin connection plug in the appropriate socket (D Layout of
Electrical Components 1, Pos. 5a or 5b) on the back of the machine.
AInstall the transparent silicone hose onto a vacant connection stub ( D Layout
of Electrical Components 1, Pos. 9, 10 or 11) and secure it with a hose clip.
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							AInstall the suction probe in the appropriate agent container and screw it tight.
AVentilate the dispenser pump; see 070 2.8.2E 02, Dispenser Settings.
x
Note
Any detergent residues in the cabinet after ventilation must be diluted and
flushed out.
ASet the quantity to be dispensedin accordance with the manufacturer's
instructions; see 070 2.9.2S 22, Setting Printer Interface (RS-232) and
Dispenser Pumps.
x
Note
If the manufacturer's instructions are not available then about2 to 3 millilitersof
liquid detergent perliterof wash water should be added in the main wash cycle.
•Example:
7 liters wash water x dispensed quantity per liter = Dispensed quantity in
milliliters
7 x 2 milliliters = 14 milliliters detergent dispensed
4.2 Replacing the Dispenser Pump Hose Complete With Pump Cap
x
Fig. 8:Dispenser Pump Hose Replacement Kit
ARemove the dispenser pump from the DOS G 60 dispenser module housing.
AReplace the dispenser pump cap with pre-installed dispenser pump hose.
AWhen re-installing, ensure that all rubber seals are seated correctly.
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							4.3 Connecting the Connection Plug for DOS Modules from Series C
to DOS Modules from Series G
x
Note
If a C-series DOS dispenser module is to be connected to a G 7881, then the
connection cable must be replaced with a connection cable with angled plug
(available from the Spare Parts department). If a straight plug is used instead of
an angled version, then it may be necessary to knock out a 1.6-inch (four-
centimeter) hole in the wall where it is contacted by the plug, as the machine has
a depth of 23.6 inches (60 centimeters).
Fig. 9:Plug Types
A Socket (mat. no. 05082410, April 2004)
B Straight plug (mat. no. 05082420, April 2004)
C Angled plug, only for prefabricated connection cables (mat. no.
04966210, April 2004)
ACut off old pins.
AInsulate the cable and crimp the wire ends.
AConnect the new pins according to the appropriate wiring diagram. See 091
Fig. 3 and 091 Fig. 4.
x
Warning!
Do not connect any voltage to the fill-level sensor!
ASecure the strain relief.
Descriptive Technical Documentation
DTD no. 62-7881 091-11
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							092 Liquid Dispensing
x
Descriptive Technical Documentation
DTD no. 62-7881 092-1
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							4 Service
4.1 Retrofitting Dispenser Hoses When Using MIC Carts
G 7882, G 7882 CD
x
Warning!
In order for dispensing quality to meet the special requirements for cleaning
microinstruments (e.g., in opthamology), the G 7882 dispensing systemmustbe
retrofitted withsmaller hoses (3 mm diameter)for theuse of opthamology
carts (e.g., E 429 and E 440). Machines to be retrofitted are those which were
not equipped as standard with thinner hoses (and whose hoses are missing the
ventilation hole on the dispensing nozzle; see 092 Fig. 1, Pos. 1).
x
Fig. 1:New Dispensing Nozzle
Refer to conversion and fitting instructions mat. no. 06704470.
AMake the rear panel of the machine accessible.
APull out the dispensing drawer.
AUnscrew dispensing nozzles DOS 1 and DOS 3 from the rear panel.
AInstall the new dispensing nozzles,mandatoryfor efficient dispensing
function with the thinner hose. The old seals must not be reused.
AReplace the old dispensing hose on the pressure side of the dispensing pump
with the new thinner hose (shortened to the length of the old hose). The Y-
piece sits directly behind the pump.
x
Warning!
For prefabricated Y-pieces, each hose connection has a different diameter.
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							AAfter installing the new hoses, access the“DOS fill”parameter in the
programming menu and reduce the fill amount to 35 millimeters, since the
new hoses are significantly thinner than the old ones.
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							093 Dispenser Pump, Container
G 7882 CD, G 7883 CD
4 Service
4.1 Removing the Drawer with Drip Tray
x
Fig. 1:Drip Tray with Holding Bracket
1 Holding bracket
2 Drawer guides
3 Drip tray
ARemoving the Drying Unit Container, 095 4.3.
ALoosen the retaining clips for connection cables and hoses.
4.2 DOS 60 and/or DOS 10 Dispenser Pump Removal
ARemove the drawer; see Removing the Drawer with Drip Tray, 093 4.1
ARemove the three retaining screws from the top of the appropriate dispenser
pump.
ARemove the dispenser pump.
ARemove the hose clips using Corbin pliers and pull off the hoses.
ADisconnect the plug contacts.
AReassemble by following these instructions in reverse order.
Descriptive Technical Documentation
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							095 Drying Unit (TA) Container
G 7882 CD, G 7883 CD
2 Function
2.1 Drying Unit Air Paths
x
Fig. 1:Air Path from Drying Unit to Cabinet
1 Air path intake (angled duct piece) from drying unit fan
2 Air duct on rear of machine
3 External air temperature sensor (NTC)
4 Air path output to cabinet
5 Non-return flap
To prevent suds from entering the air path from the drying unit, a spring-loaded
non-return flap (095 Fig. 1, Pos. 5 ) is installed in the duct just before the output to
the cabinet (095 Fig. 1, Pos. 4).
2.2 Filters
The drying unit for the G 7882 and 7883 CD is fitted with two filters. The first is a
coarse filter for pre-filtering the air taken in and the second a high-capacity
submicron particulate air filter (microfine filter) behind the fan in the air circuit. This
microfine filtermust always be installed, even in clean rooms with a filtered air
supply. The filters must be replaced after their given lifetime has expired but it
should also be noted that unusual ambient conditions can greatly reduce the filter
life.
–Coarse filter life: approximately 100 hours
–Microfine filter life: approximately 500 hours
For specific filter life information see the appropriate operating instructions. The
microfine filter may only be replaced by an authorized Miele dealer or the Miele
Service Department. Correct function is only guaranteed with a genuine Miele
HEPA, classification 12/13 filter. Any filter change must be recorded via a sticker
on the drying unit.
Descriptive Technical Documentation
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							2.3 Setting the Fan Speed (Air Throughput)
x
Fig. 2:Drying Unit with Potentiometer
1 Drying unit retaining screw
2 Potentiometer (220kΩlinear)
3 Hole for setting fan speed
4 Drying unit fascia retaining screw
Potentiometer 1R32 (see wiring diagram 096 Fig. 2) can be used to adjust the
speed of the fan motor and hence the air throughput of the drying unit within
certain preset limits. Turn the potentiometer clockwise to increase the speed and
counterclockwise to decrease the speed. The factory setting is such that a
pressure increase of approximately 0.1 pounds per square inch (6 millibars) exists
in the cabinet with the fan in operation. Modifications to this should only be made
in exceptional cases as on-site it is not possible to measure the pressure or fan
speed. If the potentiometer becomes defective, the fan continues to operate with
a lower nominal speed.
Descriptive Technical Documentation
095-2 DTD no. 62-7881
This information should not be duplicated or passed on without Miele approval. All rights reserved. 18.09.2013, US_am