Mitsubishi MELDAS M600 Series, Maintenance Manual, Page: 27 / 61

3. TROUBLESHOOTING
3.2 Troubleshooting
– 23 –
The power turns OFF.
Cause Remedy
There is a problem in the power
socket. Check whether the voltage fluctuates at certain time zones.
Check whether an instantaneous power failure has
occurred.
A problem occurs when the
peripheral device starts
operating. Check whether the voltage drops instantaneously when the
peripheral device operation starts.
The PSEMG (red) LED on the HR081 card lights.
Cause Remedy
The emergency stop switch
connected to the EMG connector
is ON (A contact), or the EMG
connector is disconnected. Set the emergency stop switch to the release (B contact)
state. Check the connection to the EMG connector.
The BATALM (red) LED on the HR081 card lights.
Cause Remedy
The LED lights when the voltage
of the battery connected to the
HR81 BAT connector has
dropped to 2.6V
±
0.065V or less.
Refer to section 4.3.2 (2) and replace the battery.
(2) Problems related to display section
The LCD screen does not appear.
Cause Remedy
The power is not supplied to the
backlight power for the display
section. Check that the F082 cable is connected to the control
section's power supply HR081 CF02 connector and
backlight power.
The connection from the LCD
display to the backlight power is
disconnected. Check that the wiring from the LCD display is connected to
the backlight power.
The F090 cable is not connected
to the HR121 card LCD
connector and HR273 card LCD
connector. Check that the F090 cable is connected.
The connection from the HR273
card and the LCD display is
disconnected. Check that the wiring from the LCD display is connected to
the HR273 card.
The LCD display, backlight power
or HR121 card is damaged. Check the cable connections. If normal, the individual
module may be damaged. Contact the Mitsubishi Service
Center.
Do not apply voltages other than those indicated in this manual on the connector.
Doing so may lead to destruction or damage.
Incorrect connections may damage the devices, so connect the cables to the specified
connectors.
Do not connect or disconnect the connection cables between each unit while the power is
ON.
Do not connect or disconnect the PCBs while the power is ON.
CAUTION