Service
21
2.15
Front panel
The following components are installed on the front panel
CPU
(on CPU-power board)
Plug-in board/SD card
= Primary storage medium for:
-
Machine software (firmware)
-
Customer memory / Service memory / Working memory
Important note for technicians:
If the front panel is replaced, the plug-in board/SD card from the defective front panel must be installed in the replacement front panel.
This restores exactly the previous condition of the machine (prior to the defect in the front panel)
Internal USB Stick
= Backup storage medium
Important note for technicians:
Because the plug-in board/SD card is the primary memory medium for the machine, a defect in the plug-in board/SD card could mistakenly be
interpreted as a defect in the front panel.
The following errors indicate that the plug-in board/SD card is defective:
- Machine does not boot (does not start or hangs up after switching on)
- Machine hangs up during operation; switching the machine OFF-ON has no effect; disconnecting the machine from the power grid for at least
5 min has no effect.
In case of doubt, therefore, the SD card must be replaced BEFORE replacing the front panel. A query routine starts automatically to capture the serial
number, software version, etc. During this routine, the data from the internal USB stick is transferred to the new SD card. This restores exactly the
previous condition of the machine (SD cards defective) If the replacement of the SD card was not successful, then the plug-in board with the SD
card can be replaced before swapping out the front panel.
Saving to the internal USB stick only works if the internal USB stick has been written with the correct identifier.
Service
>
Service routines
>
Internal USB stick backup Formatting / identification
