MITSUBISHI ELECTRIC WS-48315 - Manual (Page 33)

Page 33
Purpose:
Measuring
Instrument
Test Point
Measuring
Range
Input Signal
Ext. Trigger
Input Terminal
Symptom:
Purpose:
Measuring
Instrument
Test Point
Measuring
Range
Input Signal
Ext. Trigger
Input Terminal
Symptom:
MODELS: WS-48315 / WS-55315 / WS-65315
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Monoscope
Video Input
[Video Circuit]
7. Black Level
To set the black level of the picture.
Excess or insufficient brightness.
1. Supply a Monoscope signal to a Video Input.
2. Activate the Adjust Mode, Video Chroma Function.
3. Adjust Item “2 SBRT” so the 0% and 10% black levels on the gradation scale
are the same.
4. Press ENTER to save data.
7. Exit the Service Mode.
NOTE: Item 2 SBRT should be no more than “21”.
40% 30% 20% 10%
50% 0% 0% 0%
60% 70% 80% 90%
GRADATION SCALE
DC ma meter
DT connector pins 7 & 8
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Grayscale
RF Input
To set overall beam current to its’ optimum level.
Excess or insufficient contrast.
Note: Activate the Expand mode (full screen).
1. Supply a Grayscale signal to a RF Input.
2. Activate the Adjust Mode, Video Chroma Function.
3. Select Item “1 SCT”, signal level automatically reduces.
4. Connect a 3ma DC meter between DT connector pins 7 and 8. Positive lead to
pin 7.
5. Adjust Item “1 SCT” for the current given in the table below.
6. Remove the meter.
7. Press “ENTER” to save data.
8. Exit the Service Mode.
[Video Circuit]
8. Sub Contrast
CIRCUIT ADJUST MODE
Activate …….. MENU-0-3-5-7
Function …...………..AUDIO
Item No. ……….…….VIDEO
Adjust Data ….…….ADJUST
Save Data …. ………ENTER
Exit …………..MENU (twice)
CIRCUIT ADJUST MODE
Activate …….. MENU-0-3-5-7
Function …...………..AUDIO
Item No. ……….…….VIDEO
Adjust Data ….…….ADJUST
Save Data …. ………ENTER
Exit …………..MENU (twice)
Sub Contrast Current Alignment
WS-48315 / WS-55315 WS-65315
520 ±10ua 550 ±10ua