Sub-Y Gain; Sub Picture Offset - Mitsubishi Electric HD-6000 Service Manual

[Video Circuit]

2. Sub-Y Gain

Measuring
Oscilloscope
Instrument
TPY & TPSY
Test Point
Ext. Trigger ------
Measuring
-------
Range
Input Signal
Color bars
Input Terminal External Input
[Video Circuit]

3. Sub Picture Offset

Measuring
----
Instrument
----
Test Point
Ext. Trigger
------
Measuring
-------
Range
Input Signal
Full White Raster
Input Terminal
External Input
MODEL: HD-6000
Purpose: To set the sub picture Y level
Incorrect analog source sub picture brightness level.
Symptom:
1. Supply a Color Bar pattern with 100% white signal to an External Input.
2. Select the Color Bars as the source for both the main and sub pictures.
2. Connect a scope to TPY (Main Luminance) & TPSY (Sub Luminance).
3. Enter the Alignment Mode (MENU-2-4-5-7)
4. Select the SMTX function (AUDIO button).
5. Select adjust item #14 YDRS (VIDEO button).
6. Set the data so the waveform at TPSY equals TPY. (ADJUST buttons).
7. Press "ENTER" to save data.
8. Press "MENU" twice to exit the service mode.
PWB-SIGNAL (Partial)
TPSY
Purpose:
To match sub picture white to main picture white
Symptom:
Sub picture white differs from white in the main picture.
1. Supply a full white raster signal to an External Input.
2. Select the White raster as the source for both the main and sub pictures.
3. Use the PIP/POP buttion to select the Single PIP mode.
4. Enter the Alignment Mode (MENU-2-4-5-7)
4. Select the AD9883A function (AUDIO button).
5. Select item #12 ROFF and #14 BOFF (VIDEO button).
6. Set the data fore items #12 and #14 so the sub picture white is close to that in
the main picture. (ADJUST buttons).
7. Press "ENTER" to save data.
8. Press "MENU" twice to exit the service mode.
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TPY