Table of Contents
Advertisement
MODELS: WS-48511 / WS-55511 / WS-55711 / WS-65511 / WS-65611 / WS-65711 / WS-65712 / WS-73711 / WS-B55
[Video Circuit]
11. Black Level
Measuring
-----
Instrument
Test Point
-----
------
Ext. Trigger
Measuring
------
Range
Input Signal
Monoscope
Input Terminal
Video Input
CIRCUIT ADJUST MODE
Activate ........ MENU-2-1-5-7
Function .................AUDIO
Item No. .................VIDEO
Adjust Data ...........ADJUST
Save Data .... .........ENTER
Exit ..............MENU (twice)
[Video Circuit]
12. Sub Contrast
Measuring
DC ma meter
Instrument
DT connector pins 7 & 8
Test Point
------
Ext. Trigger
Measuring
-----
Range
Input Signal
Grayscale
RF Input
Input Terminal
CIRCUIT ADJUST MODE
Activate ........ MENU-2-1-5-7
Function .................AUDIO
Item No. .................VIDEO
Adjust Data ...........ADJUST
Save Data .... .........ENTER
Exit ..............MENU (twice)
Purpose:
To set the black level of the picture.
Excess or insufficient brightness.
Symptom:
1. Supply a Monoscope signal to a Video Input.
2. Activate the Adjust Mode, VC 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.
40% 30% 20% 10%
50% 0%
0%
0%
60% 70% 80% 90%
GRADATION SCALE
To set overall beam current to its' optimum level.
Purpose
Symptom:
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, VC 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" to the values given in the Table below.
MODEL
45 inch models
55 inch and 65 inch models
73 inch models
6. Remove the meter.
7. Save data and Exit the Service Mode.
Page 43
CURRENT
540 ±5ua
595 ±5ua
620 ±5ua
Advertisement
Table of Contents
