promethean PRM-30A Service Manual page 31

Electrical Adjustments
PC, Video, Component Manual adjustment
When the PC, Video or Component Auto Calibration
fails, take the following manual adjustment instead of
auto calibration.
[1] Manual adjustment (PC)
Input mode Computer 1 (RGB) mode
Input signal 16-step gray scale computer signal
- Pedestal adjustment
1. Enter the service mode.
. A djust the pedestal level and black level to be the same
level by changing the data values of the Group - No.
Group No. Test Point
0 - 0
TP35G
0 - 1
TP35R
0 - 2 TP35B
- Gain adjustment
1. Enter the service mode.
a
. A djust the amplitude "
the data values of the Group - No.
Group No. Test Point
0 - 3 TP35G
0 - 4 TP35R
0 - 5
TP35B
White Level
(a)
Adjustment
ADC G-Offset
ADC R-Offset
ADC B-Offset
" to be minimum by changing
Adjustment
ADC G-Gain
ADC R-Gain
ADC B-Gain
[2] Manual adjustment (Component)
Input mode Computer 1 (Component) mode
Input signal 1 6-step gray scale component signal
(480i)
- Pedestal adjustment
1. Enter the service mode.
. A djust the pedestal level and black level to be the same
level by changing the data values of the Group - No.
Group No. Test Point
0 - 0
0 - 1
0 - 2
- Gain adjustment
1. Enter the service mode.
. A djust the amplitude "
the data values of the Group - No.
Group No. Test Point
0 - 3
White Level
(a)
[3] Manual adjustment (Video)
Input mode Video (Video) mode
Input signal 1 6-step gray scale composite video
signal
- Gain adjustment
1. Enter the service mode.
. A djust the amplitude "
the data values of the Group - No.
Group No. Test Point
20 - 0
White Level
(a)
-31-
Adjustment
TP35G ADC G-Offset
TP35R ADC R-Offset
TP35B ADC B-Offset
a
" to be minimum by changing
Adjustment
TP35G ADC Y-Gain
a
" to be minimum by changing
Adjustment
TP35G Y-Level