Extron Electronics IN3012 - Manual (Page 8)

4
IN2085 / IN3012 OPERATION MANUAL - REV. 2.1 02/19/00 ©1996 - INLINE, INC.
TROUBLESHOOTING
There is no image displayed on the projector. The output of the IN2085 / 3012 doesn’t seem to
work.
1.
Verify that the signal from the graphics source is compatible with the projection device by
connecting them directly (bypass the IN2085 / 3012).
2. Check to make sure the sync cables are good. Try sending sync on one of the RGB cables.
3. Check the power supply. If the power supply is receiving power and working properly it should
feel slightly warm to the touch after it has been plugged in for half an hour. If the power supply
feels cool to the touch you may have either a faulty A/C power source or a bad power supply.
One of the colors is completely missing from the projected image.
Verify that the input and output cables are good. Bypass the missing color signal around the
IN2085/3012, joining the input and output cable for that one color together with a BNC barrel. If the
problem goes away, the IN2085 / IN3012 may be faulty. If the problem persists, one of the input/output
cables or the graphics source is faulty.
The colors are not displayed properly on the projector/monitor.
1.
Verify that all RGB connections are correct and that none of the colors is swapped.
2. The IN2085 / IN3012 gain pots may be misadjusted. Begin by setting the three gain pots to a
similar position.
3. Bypass the IN2085 / IN3012. If the problem persists, the data projector may have the video drive
levels on the CRTs misadjusted. Re-calibrate the Red, Green, and Blue drive levels.
The projected image is far too "hot", appearing excessively white and washed-out.
The IN2085 / IN3012 RGB gain pots may be set too high. Reset to a lower level.
The IN2085 / IN3012 is being used to drive / split four separate composite video signals. The three
signals on the Red, Green, and Blue are working well, but the Sync connector doesn’t seem to pass
the fourth video signal.
While it is perfectly fine to use the Red, Green, and Blue channels to drive or split composite video
signals, the Sync channel has an AGC circuit and is not designed for analog video signals.
When using the IN2085 / IN3012 with low scan rate images, the peaking control doesn’t seem to
have much effect on the projected image.
The IN2085 / IN3012 peaking is centered around 100 MHz. This is located outside the range of low scan
rate signals and mainly helps restore high frequencies for very high scan rate, high bandwidth signals.