Service manual

2. TROUBLESHOOTING
Service Manual CNS-9701 2.13
Power Problem
Problem Possible Cause Action
AC power is not obtained from the
power cord.
Check that the AC power is obtained from
the AC outlet on the facility wall.
The power cord is loose between
the AC outlet and AC inlet of the
main unit or display unit through
the AC adapter.
Disconnect the power cord between the
AC outlet and AC inlet of the main unit or
AC adapter, and connect the power cord
between them again.
- When the main unit is
turned on, the power lamp
on the front panel does not
light.
- When the display unit is
turned on, the LCD does
not light.
- The main unit or display
unit frequently turns itself
off.
The power supply unit in the main
unit or AC adapter for the display
unit has a failure.
Replace the power supply unit or AC
adapter with a new one.
In power failure, the UPS does
not cover the power requirement
of the central monitor.
The battery in the UPS is
completely discharged.
Replace the battery with a new one.
UPS has a failure. Replace the UPS with a new one.
To replace the board or unit with a new one, refer to Section 4 “ Disassembly and
Assembly”.