Service manual

2. TROUBLESHOOTING
2.14 Service Manual CNS-9701
Display Problem
CAUTION
To replace the hard disk with a new one, refer to “Hard Disk Flow” in
this section and “Replacing the Hard Disk” in Section 4 “Disassembly
and Assembly”.
Problem Possible Cause Action
The RGB cable has poor contact
betweenthedisplayunitandmain
unit.
Disconnect the RGB cable and firmly
connect the RGB cable between them.
The RGB signals are not output
from the graphic board in the main
unit.
Replace the graphic board with a new one.
The “NO SIGNAL” message
appears on the black screen of
the display unit.
The main unit is not turned on.
Check the problem items shown in the
above "Power problem" table.
- The screen is out of
synchronization.
- The screen is flickering.
- The screen display position
is not correct.
The horizontal or vertical
synchronization setting is not
adjusted properly.
Perform the synchronization adjustment at
the display unit.
The hard disk is damaged. Replace the hard disk with a new one.
A "No boot device" message
appears and Windows 2000 does
not start.
The hard disk is not recognized
due to incorrect BIOS setting.
Set the BIOS setting correctly.
A "HDD Problem Call Nihon
Kohden" message appears and
the hard disk lamp is lit.
The hard disk is damaged. Replace the hard disk with a new one.
(To use the central monitor temporarily,
turn the main unit off and on. But note that
this problem will appear again some time.)
The RGB cable has an internal
break.
Check the continuity with a multimeter.
Replacethecablewithanewoneifthe
cable has a break.
The graphic board in the main unit
has a failure.
Replace the board with a new one.
The screen is only one color
such as
- The screen color is only
blue.
- The screen color is only
red.
- The screen color is only
yellow.
The display unit has a failure. Replace the unit with a new one.
Adjustment*
1
of the display unit is
required.
Adjust the display unit according to
"Adjustment" section.
- The screen is not clearly
displayed.
- The screen display position
varies.
- The screen is distorted.
- The screen dims.
A failure of the display unit*
2
or
graphic board of the main unit.
Replace the defective board*
3
with a new
one.