Hughes JVC 100, User Manual

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Chapter 4—Setup Adjustments
HJT Model 100 User's Guide 4-9
4.1.4. Internal Source
Every channel has a preset internal source shown as S
OURCE
0 on the
S
OURCE
list. This is factory set “default timing” for the projector with
scanning rates of 33.3 kHz (horizontal) and 59.3 Hz (vertical). This
internal source is used to read menus when there is no source input
connected to the projector. To use this internal source, select C
HANNEL
0,
then press E
NTER
. This internal source can be copied to any other
channel but it cannot be cut, edited, or pasted to.
4.2. Timing Settings and Adjustments
Each type of source requires timing settings and adjustments. Perform these prior
to geometry because the geometry adjustments are dependent on the proper
timing of raster scanning. The Timing adjustments are universal to RGB and color
selection is not necessary.
4.2.1. Clamp Type
Use the default clamp type unless there are sync problems with the new
signals being used.
Clamp type sets the type of clamping used with the sync pulse.
There are three (3) types of clamping;
BP (Back Porch) is used in 95% of all computer and video inputs,
Back Porch is the default;
ST (Sync Tip) is seldom used but is necessary when there is
no Back Porch to clamp on;
TL (Tri-Level) which is used mainly for HDTV.
To set the Clamp Type:
1. Access the T
IMING
menu.
2. Press #4, C
LAMP
T
YPE
from the T
IMING
menu.
3. Highlight BP, ST, or TL using arrow keys.
4. Press E
NTER
to select.
NOTE: WVHS and HDTV use tri-level sync signals. When the HDTV
VIC is used, the clamp type should be “Tri-level.”
4.2.2. VTR Mode
Set VTR mode to ON position if the projector’s input comes from a VTR
source or is line-doubled DVD. This setting stabilizes the VTR sync input.
Otherwise, set the VTR mode to OFF.
To set the VTR Mode:
1. Select VTR M
ODE
from the T
IMING
menu.
2. Press E
NTER
to toggle the VTR M
ODE
to OFF (unchecked box)
unless using a VTR as a video source.
3. Press E
SCAPE
to return to the T
IMING
menu.