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8. Trouble shooting
Symptom CHECK ACTION
Fuse
Check the fuses in the fuse box located above the AC
inlet. If they have been brown, you need to find a part
that may cause the excessive load by disconnecting
parts one by one.
Power does not turn
ON
Interlock switch
This interlock switch is depressed by the key attached to
the lamp house lid. Thus it must be closed completely.
This interlock switch breaks AC power line. See Photo-1.
Lamp block
Ignition sound can be heard from the Lamp power
supply unit. It means that the LPSU and its control line
are OK.
1) Replace the lamp. It’s been worn out or defective?
2) The lamp has been held by the heat sink firmly?
3) The lamp block has been attached to the lamp house
firmly?
Lamp power supply
(LU1) w Igniter (IGN1)
1) Check the cable (B703) between the LPSU and
Igniter if it has been connected firmly.
2) Check the cable (B707) between the AC terminal
(TB1) and the LPSU if it has been connected firmly.
3) Check if the fans have been connected to the LPSU
correctly. If not, the LPSU won’t supply power.
4) Check if the LPSU or inside of the unit is heated. It
may cause the protection circuit of the LPSU to go
off. Check the cooling fans.
5) Check the flat cable (B504L) where the ignition signal
goes through if it has been connected firmly.
6) Check if the high voltage wires between Igniter and
the lamp house are routed correctly. If it is near the
metal part, it may cause high voltage leakage.
7) Replace the LPSU or Igniter.
Lamp does not light
Others
1) Check the cable (B508) between the Control Panel
(PB1) and CN38 on Mother Board (E700) if it has
been connected firmly.
2) The lamp switch on the front panel is OK? This
switch is independent from the touch panel operation.
3) Peripheral Board (G700) is OK?
Iris unit
After transportation or iris unit replacement, the
followings may occur:
1) Check if the iris plate is detached or bended and
touches to the frame or something.
2) Check if the iris cable is connected firmly to CN32 on
Mother Board (E700).
Iris does not work
Preprocess Board
(J700)
The signal that controls the iris varies depending on the
scopes. For example, with 90i scope, the iris control
signal is created from the LVDS signal (DO+/DO-), with
70 K scope, it is Yout. Thus, if the iris works correctly
with another type of scope, Preprocess Board may be
malfunctioning.
No image from DVI
port
System Setting
DVI output setting is not suitable for the type of the
connected monitor. If the monitor is DVI-V, the DVI
Output setting is “DVI”. If the monitor is DVI-A, the
setting must be “VGA”.
No image or strange
image
Process Board (H700)
Video Board (I700)
I/O-1 Board (L700)
If the image doesn’t show or becomes strange
depending on the video output terminal, the boards
listed in the left column are suspected.
If no image or strange image from RGB, Y/C or Video
terminal, Video Board or I/O-1 Board may be
malfunctioning. If no image or strange image from DVI
port, Process board or I/O-1 Board may be defective.
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