Display Chk - Yamaha DSP-AX2 Service Manual

DSP-AX2

6. DISPLAY CHK

This program is used to check lighting of the FL display which changes as shown below according to operation of
the sub-menu.
The signals are processed using EFFECT OFF. (The L/R signals are output using ANALOG MAIN BYPASS set-
ting.)
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 internal synchronization but
other than that it is forced to the external synchronization setting.
Also, except for the initial display, 128 pictographs for checking the OSD driver are used for the video signal
output display (monitor screen).
Reference (PRE OUT)
INPUT : DVD ANALOG
SWFR: 50Hz, Others: 1kHz
Both ch, -20 dBV, volume 0dB
[Remote control code: 7A—8F (PRG 8)]
Initial display
6. DISPLAY CHK
EFFECT OFF
Lighting in a lattice
Example of
Normal
short
Segment conditions of the FL driver (IC901, IC902) 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 a lattice). (In the above
example, the segments in the second row from the top are shorted.)
19
Condition MAIN L/R
-3.5 dBV
[Remote control code: – – – – ]
All segments OFF
Lighting of segments in a lattice
[Remote control code: – – – – ]
CENTER REAR C SWFR
– ∞ dBV – ∞ dBV – ∞ dBV
[Remote control code: – – – – ]
All segments ON (dimmer 100%)
All segments ON (dimmer 50%)
[Remote control code: – – – – ]
REAR L/R FRONT L/R
– ∞ dBV – ∞ dBV