19. Board Diagnostic LED’s
Image 19-2
CAUTION: Only operate the projector for a few minutes while the Input & Communication unit is moved and
tilted in it’s service position. This to minimize the risk of exceeding the maximum permitted internal temper-
ature limit due to insufficient airfl ow.
Description of the diagnostic LEDs
Ref. Description (LED
color)
Comment
1
+1.5V OK (green)
This LED lit up in normal condition and indicates that the local generated +1.5V is available. The
+1.5V is derived from the +12V which is generated by the switched mode power supply.
2
+14V OK (green)
This LE D lit up in normal condition and indicates that the +14V is available.
3
+5V OK (green)
This LED lit up in norm al condition and indicates that the local generated +5V is ava ilable. The
+5V is derived from the +12V which is generated by the Switched m ode power supply
4
+24V OK (green)
This LE D lit up in normal condition and indicates that the +24V is available.
5
+3.3V OK (green)
This LED lit up in normal condition and indicates that the local generated +3.3V is available. The
+3.3V is derived from the +12V which is generated by the Switched mode power supply.
6
OVERTEM P (red) This LED only lit up in case one of the temp
eratures of the DMD BACK, or AMBIENT OUT, or
LAMP OUT exceeds the maximum allowed temperature. Thes e maximum allowed temperature
values are built in the hardware of the Fan Control Board.
When this LED lit up the L PS ERROR LED should also lit up indicating that the LPS module has
been shut down by the Fan Control Board to prevent projector damage.
In other wo rds, this is a hardware protection wh ich switches off the lamp to prevent projector
damage in case the software protection sho uld fail. N ote that this hardware protection is the
second protection. Norm ally if one of these temperatures is about to exceed the hardware
maximum level the Fan Control Board (FCB) software s hould have noticed this be fore (because
the so ftware maximum levels are lower) and command the LPS module to shut down the lamp.
See LP S ERROR below.
A short circuit (damaged wire unit) of the temperature sensor or a malfunctioning temperature
sensor also results in an OVERTEMP error.
7
LPS ERROR (red) This LED lit up in case the Fan Control B oard pulls down the line to the LPS module to shut
down the lamp. This is a hardware protection. The reason the Fan Control Board pulls down this
line is various:
• The Fan C ontrol Board has detected an OV ERTEMP error (see above).
• The projector runs in after cooling.
• The projector is in Standby mode.
• The Fan Control Board has detected an EXT WATCHDOG error or the Fan Control Board is
in boot mode. (E.g. during software update).
• The Fan Control B oard has detected that the micro switch in the Lamp House compartment is
not closed (Lamp House not inserted well).
• The Fan Control Board has detected that the micro-switch of the Liquid Cooling reservoir is
not closed (open handle or insufficient liquid).
8
UNDERTEMP (red) This LED only lit up in case one o f the temperatures of the DMD BAC K, or AMB IENT OU T is below
the m inimum allowed temperature. Th ese minimum allowed temperature values are b uilt in the
hardware of the Fan Control Board.
308 R5905312 HDF W SERIES 24/01/2013
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