PRODUCTION
page 38
A more detailed explanation follows:
Colorizers
101
BGR color
Null R-Y
Null B-Y
---
102
BDR color
Null R-Y
Null B-Y
---
103
DSK color
Null R-Y
Null B-Y
---
114
Zero phase
BGR
BDR
DSK
115
Luminance
BGR
BDR
DSK
116
Saturation
BGR
BDR
DSK
The three color generators can be very accurately set to provide precise
colors. Use 115 COMM with all three colors on the preview monitor, set
all color luminances to 100 %, and use an oscilloscope and the
SYMM/BORDER/CLIP knobs to set all luminances to 100 IRE. Using a
vectorscope, use command 101 to null out any chroma offset in the R-Y or
B-Y component of BGR color. Command 102 is for BDR color. Command
103 is for DSK color. Then set all colors to roughly 99 50 0. With a
vectorscope on preview, adjust all three colors to full saturation and zero
degree phase with commands 114 and 116.
Wipe center
104
Wipe DC
Wipe size
---
---
To adjust the command, set up a diamond wipe on the monitor (pattern 7),
and with the wipe in the N/R mode, set the wipe lever to a value of 40.
Now adjust this calibration value until the diamond just disappears. Now
check the wipe travel at the other end of the lever. The wipe should finish
at a count of somewhere between 925 to 975.
Dac DC
An oscilloscope is required for this calibration. Scope U25 pin 7 on the
CPU board with the scope triggered at a vertical rate. Adjust this
calibration until the DAC waveform is /- 5 mv of ground during the
active raster.
Black level
106
Black offset
Offset
---
---
While viewing any of the three black burst outputs, adjust command 106 to
set the blanking level of the black output to ground.
