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[Video Circuit]
3. Main/Sub Color Level
Measuring
Oscilloscope
Instrument
JA pin 21
Test Point
JB pin 3
------
Ext. Trigger
------
Measuring
Range
Input Signal
Color Bars
Input Terminal
Video
CIRCUIT ADJUST MODE
Activate ........ MENU-2-2-5-7
Function .................AUDIO
Item No. .................VIDEO
Adjust Data ...........ADJUST
Save Data .... .........ENTER
Exit ..............MENU (twice)
[CRT Circuit]
4. CRT Cutoff
Measuring
Oscilloscope
Instrument
TP6R, TP6G, TP6B
Test Point
------
Ext. Trigger
Measuring
50V/Div. 2msec/Div.
Range
Input Signal
None
Input Terminal
Video Input
CIRCUIT ADJUST MODE
Activate ........ MENU-2-2-5-7
Function .................AUDIO
Item No. .................VIDEO
Adjust Data ...........ADJUST
Save Data .... .........ENTER
Exit ..............MENU (twice)
MODELS: VS-A50 / WS-A48 / WS-A55 / WS-A65
Purpose:
To match the sub picture color to that of the main picture.
Symptom:
Main and sub pictures colors differ.
1. Supply an NTSC signal to an External Video Input.
2. Select the NTSC signal as the source for both the main and sub pictures.
3. Connect an oscilloscope to connector JA pin 21 (Main PR).
4. Activate the Adjustment mode.
5. Select Item "2 COLM" in the Main Matrix Function.
6. Adjust data so the PR signal is 0.71 Vp-p max. - 0.66 Vp-p min
(If it cannot be adjusted within this range, set to the lower value)
7. Connect an oscilloscope to connector JB pin 3 (Sub PR).
8. Select item "2 COLS" in the Sub Matrix Function.
9. Adjust so Sub PR = Main PR.
Purpose
To set the cutoff point for all three CRTs.
Monochrome has a color tint, or incorrect brightness.
Symptom:
Note: Use the Expand mode (full screen)
1. Select an External Input with no signal.
2. Enter the Adjustment Mode, Video Chroma Function.
3. Press "1", automatically blanks the screen and sets COL to 0.
4. Set the data to the values given in the table below.
5. Connect the oscilloscope to TP6R.
6. Adjust the Red Screen VR so the black level is 170V, as shown below, or
198.5V ±1VDC using an DC Voltmeter.
7. Repeat Steps 4 and 5 to set the Blue and Green Screen VRs, using
TP6G and TP6B.
Note: White Balance must be performed after this adjustment.
Cutoff Preset VC Data
Item
Abbr
Data
1
SCT
42
2
SBRT
20
3
SCON
7
4
RDRH
31
5
GDRH
41
6
BDRH
31
7
CTRH
31
8
CTGH
31
9
CTBH
31
Page 31
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