MITSUBISHI ELECTRIC WS-48513 - Manual (Page 43)

Page 43
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-48513 / WS-48613 / WS-55513 / WS-55613 / WS-55813 / WS-65513 / WS-65613 / WS-65713 /
WS-65813 / WS-73513 / WS-73713
[Video Circuit]
Oscilloscope
JA pin 28 & JA pin 37
JB pin 5
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Color Bars
Video
To match the sub picture color to that of the main picture.
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 28 (Main Pr).
4. Activate the Adjustment mode.
5. Select Item “24 SCLR” 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 JA pin 37 (Sub PR).
8. Select item “24 SCLR” in the Sub Matrix Function.
9. Adjust so Sub PR = Main PR.
3. Main/Sub Color Level
CIRCUIT ADJUST MODE
Activate …….. MENU-0-3-5-7
Function …...………..AUDIO
Item No. ……….…….VIDEO
Adjust Data ….…….ADJUST
Save Data …. ………ENTER
Exit …………..MENU (twice)
To set the cutoff point for all three CRTs.
Monochrome has a color tint, or incorrect brightness.
[CRT Circuit]
4. CRT Cutoff
Oscilloscope
TP6R, TP6G, TP6B
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50V/Div. 2msec/Div.
None
Video Input
Note: Use the Expand mode (full screen)
1. Select an External Input with no signal.
2. Enter the Adjustment Mode, VC Function.
3. Press “1”, automatically blanks the screen and sets COL to 0.
Note: If the screen goes blue, turn off Video Mute.
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 175V, as shown below, or
178V ±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.
CIRCUIT ADJUST MODE
Activate …….. MENU-0-3-5-7
Function …...………..AUDIO
Item No. ……….…….VIDEO
Adjus t Data ….…….ADJUST
Save Data …. ………ENTER
Exit …………..MENU (twice)
VC Function
Item Abbr. Setting
1 SBRT 24
2 SCT 42
3 SCON 9
4 RDRH 31
5 GDR 42
6 BDRH 40
7 CTRH 31
8 CTGH 43
9 CTBH 25