Yamaha YSP-1 Service Manual page 28

YSP-1
3. EFFECT OFF / DISPLAY CHECK
This program is used to check the FL display section.
The display condition varies as shown below according
to the sub-menu operation. The signals are processed
using EFFECT OFF (The L/R signal is output using
ANALOG MAIN BYPASS.)
The video signal internal/external synchronization
switching is controlled by the microprocessor. When
the initial message is displayed and all the FL segments
light up, it is switched to the internal synchronization but
o t h e r t h a n t h a t i t i s f o r c e d t o t h e e x t e r n a l
synchronization setting.
Also, when all segments are turned on, 128 pictographs
for checking the OSD driver are output on the monitor
screen.
Initial display
Segment conditions of the FL driver and the FL tube are
checked by turning ON and OFF all segments. Next,
the operation of the FL driver is checked by using the
dimmer control. Then a short between segments next
to each other is checked by turning ON and OFF all
segments alternately (in lattice). (In the above example,
the segments in the second row from the top are
shorted.)
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All segments OFF
Lighting of segments
Lighting in lattice
in lattice
Short Normal
All segments ON (dimmer 100%)
All segments ON (dimmer 50%)