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Observe max. torque for the screw connections according to the following table:
Screws
on new aluminium parts without threads, e.g.
TX 20, self-tapping
upper cover, base
TX 10 (4 x)
on lever of brewing unit (TCBU)
TX 10 (4 x)
on brewing unit (TCBU)
TX 10
on thermoblock support (central)
NTC threaded bolt
NTC sensor fixation on thermoblock
TX 20 (2 x)
Clip for thermo fuse, fixation on thermoblock
Ground connection (PE) on base and holder for
TX 20
brewing unit
Designation of spare parts
The components in the following illustrations are indexed with position numbers.
See separate spare parts list for corresponding spare part numbers.
Distinguish between spare parts of the two different coffee machine models.
Electrostatic discharge protection
When installing a new electronic mainboard, the service technician must be earthed with
a grounding band.
Wiring arrangement
Random changes in the wiring arrangement during a repair can cause
-
squeezed and damaged wires,
-
electromagnetic interferences.
Protective measures:
•
Do not change the course of internal wiring during repair.
•
Use all existing cable ducts and clips.
Residual water
•
If it is necessary to pull off hoses from components, hold ready a small beaker and
a towel to collect and wipe away leaking water.
•
The coffee machine must be emptied of residual water for repair or shipment (refer
to "Special settings" on page 28).
Protection against scratches
During general disassembly, lay all metallic housing parts on a soft cloth to avoid
damaging their surface.
Screw connections
Maestria / Gran Maestria service manual
R E P A I R S
Torques
200 (+50/-50) Ncm
2 (+0.5/-0.5) Nm
60 (+20/-10) Ncm
0.6 (+0.2/-0.1) Nm
50 (+30/-0) Ncm
0.5 (+0.3/-0) Nm
150 (+30/-0) Ncm
1.5 (+0.3/-0) Nm
80 - 100 Ncm
0.8 - 1.0 Nm
150 (+30/-0) Ncm
1.5 (+0.3/-0) Nm
150 (+30/-0) Ncm
1.5 (+0.3/-0) Nm
41
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