Troubleshooting
120 Service Instructions 878-M PREMIUM - 03.0 - 10/2019
21.3 Error in the software
In rare cases, it may happen that no more menus can be called up after
an error message. Even restarting the machine may not eliminate this
problem.
In this case, it is possible to access the Technician level immediately
during machine startup. It is then possible to carry out an error diagnosis
by using Multitest or to reset the machine to the factory settings in the
Reset menu.
To access the Technician level during startup:
1. Switch off the machine with the main switch.
2. Hold the F button pressed down, and at the same time switch on the
machine with the main switch.
The machine starts up and the display shows the input screen for the
password.
3. Use the numeric buttons to enter the password (25483).
You are at the Technician level.
21.4 Testing the function of the buttons
If it is suspected that the buttons on the control panel are not functioning
correctly, this function can be tested.
To test the functionality of the buttons on the control panel:
1. Switch off the machine with the main switch.
2. Hold the ESC button pressed down, and at the same time switch on
the machine with the main switch.
The display shows the this window:
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