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MAINTENANCE
3.4
MONITOR LED INDICATORS
The monitor is equipped with four LEDs, located
and
labeled
as
shown
in
Figure
1-7.
All
the
LEDs normally glow.
With the
exception of the POWER LED,
a
turned-off
LED
means
that
the
associated signal is not present.
Table 3-10 specifies the LEDs,
their operation, and associated FRU.
Table 3·10:
Monitor LED Description
• - • • • + - - • + - • • - - - - - - - - - - - - - - - - • - - • • - - • • • - - • • - • - - - • • • - • • • • • • • • • - • - •
LABELIFRUjOPERATION
. - .. ·+. - -+- •. - - - - .• - - - .. - ...• - ••.....••.. - .. - •.••.•• - • - - •••• - .•••
POWER [a] The LED is switched OFF when the
Power
Supply
output
voltage drops below its failure threshold.
VIDEO [b] The LED is switched OFF when
the
Video
signal
drops
below its failure threshold.
*
HSYNC [b] The LED is switched OFF when the Horizontal Sync signal
drops below its failure threshold.
VSYNC [b] The LED is switched OFF when the Vertical
Sync
signal
drops below its failure threshold.
[a]
Power Supply
[b]
Most probable failed·FRU first:
1 VCBOl Module
2 Monitor Video Module
3 Video Cable BC18T-10
*
When most of the screen is black (that is, only one
or
two
lines
of text are displayed) the VIDEO LED may appear to be
OFF (due to low average-video-pulse input).
To verify,
run
the VCBOl diagnostic ALIGN section (subsection 3.3.1.1).
If
the LED remains OFF, replace the Video module.
If
the
LED
turns ON, there is no failure.
3·22
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