Hitachi SAMURAI Series Service Manual page 126

4. Troubleshooting
Summary of fault diagnosis
4.7 Summary of fault diagnosis
1 Alarm
In case of an alarm, the alarm light at the remote side and the alarm light on the display PCB of the main unit become
illuminated, and the background of the LCD Screen of the main unit side becomes red. In case of stopping a unit in which
an alarm has occurred, please perform a stop operation instead of turning power OFF.
LCD Display: Shows the details
(Background colour turns red)
Alarm display lamp: Lit ON
Faulty PCB segment: Abnormality code
N O T E
• When performing a stop operation, the background of the alarm display becomes white for a moment, and the "Alarm
history check function" allows to display the details of the abnormality that has been activated before.
• When turning the power OFF and then ON again, the display returns to the initial state, but the "Alarm history check
function" allows to display the details of the abnormality that has been activated before.
• Even if power is turned OFF, the "Data stored immediately before alarm occurrence" is maintained.
• The "Data stored immediately before alarm occurrence" is stored only for the last 3 alarm occurrences. For alarms prior
to the fourth latest, only history is stored.
118
SMGB0082 rev.1 - 07/2015
Alarm occurrence
Stop control
Yes
Checked the details of
abnormality in "Status" screen?
Abnormality code is shown
in "History" screen
Check details of abnormality
of LCD part
Check data stored
immediately before alarm
occurrence
Processing position of the
alarm part
Remote operation display lamp: Lit ON
Remote alarm display lamp: Lit ON
(Remote side)