Service Adjustments (Electronic Controls)
Note: The pattern used in this procedure is an EIA color
Note: Turn the Receiver ON. Operate the Receiverbar pattern with 87.5% modulation with 100 IRE
for 60 minutes using the first Purity Check fiwhitele andd 7.5 black. Correlate the information in this
(white screen) to stabilize the CRT. Fulprloceydure to the pattern used if another signal
degauss the Receiver by using an externalis used.
degaussing coil.
2. Preset the following controls:
? Brightness . . . . . . . .Center.
? Color . . . . . . . . . . . .Min.
Sub-Brightness
? Picture . . . . . . . . . . .Max.
Serviceman DAC Adjustment (B2)
? Sharpness . . . . . . . .Center.
Adjustment of this control is important for setting proper
3. Set RGB Gamma Register OFF (S3 to 0)
operation of customer brightness and picture controls.
4. Connect the oscilloscope to TP47R (A-Board,
This adjustment must be made after Sub-Contrast or
below IC101).
Color Temperature adjustments are madDo note.
5. Set the scope time basme s (to 20horizontal).
adjust the SCREEN VR after the Sub-Brightness
is set.6. Connect a jumper from TPD2 to ground ( ).
Preparation:Procedure:
3. Preset the following controls:
1. In the Serviceman Mode, select DAC
? Tint. . . . . . . . . . . . . .Center.
Sub-Brightness Adjustment (B2) and adjust for
? Color . . . . . . . . . . . .Center.1.5~1.9Vp- bp etween blanking and 7.5 IRE level.
? Picture . . . . . . . . . . .Max.
4. Apply a Black and White cross pattern.White
5. Operate the Receiver for a minimum of 30 minutesYellow
prior to performing this adjustment.Cyan
Green
Magenta
Procedure:
1.5Vp-p ?0.1VRed
In the Serviceman Mode for making electronicBlue
adjustments, select the DAC adjustment (B2) and
Black
adjust until the 7.5 IRE part is the same light output
SYNC
as 3 IRE part.
TIP
1.5Vp-p ~ 1.9V
Figure 23T. P47R waveform
2. In the Serviceman Mode for electronic
adjustments, select DAC Sub-Contrast Adjustment
(B3) and adjust fo1.5Vrp- p ? 0.1V from white level
to black level on video waveform (see video
waveforms detail, Fig. 23).
3. Remove the jumpers (Preparation step 6).
3 IRE 7.5 IRE7.5 IRE3 IRE
4. Set S3 to 1.
Figure 22S. ub-Bright Pre adjustment
Tint/Color Adjustment
Serviceman DAC Adjustment (B1) (B0)
You may set the accurate value following the Preparation:
Preparation steps and the Procedure step No. 1 1. of thPresete the following controls:)
? Tint. . . . . . . . . . . . . . . . . . . . Center.
Sub-Contrast adjustment described below.
? Color . . . . . . . . . . . . . . . . . . Center.
Sub-Contrast? Picture . . . . . . . . . . . . . . . . . Max.
? Sharpness . . . . . . . . . . . . . . Min.
Serviceman DAC Adjustment (B3)
? Bright . . . . . . . . . . . . . . . . . . Min.
This adjustment is factoDo notry set. adjust unless
? Color Temp . . . . . . . . . . . . . Normal.
repairs are made to associated circuit, the CRT Board
2. Set RGB Gamma Register OFF (S3 to 0).
or when the CRT is replaced.
3. Connect a jumper from TPD2 to ground ( ).
Preparation:
1. Apply a color bar signal pattern with 87.5%
modulation, 70% saturated color bar with a 100
IRE white and 7.5 black.
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ACEC
