Text preview for : Video_Adjustments.pdf part of Mitsubishi VS-50805, WT-60805, WS-55905, WS-65905, WS-73905, WS-55805, WT-46805 Mitsubishi VS-50805, WT-60805, WS-55905, WS-65905, WS-73905, WS-55805, WT-46805 (Chassis V16 N W) (Training Manual + Schematic)



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MODELS: VS-50805 / VS-60805 / WT-46805 / WS-55805 / WS-55905 / WS-65905 / WS-73905
[HV Circuit] 3. HV Regulation
Measuring Instrument Test Point Ext. Trigger Measuring Range Input Signal Input Terminal DC Voltmeter DT 1 & 2 -----------Video Signal Monoscope Video Input

Purpose: Symptom:

To set the CRT Anode voltage. Dark Picture

Note: This adjustment must be rechecked following Adjustment 9 CRT Cutoff. 1. Supply a video monoscope signal. 2. Sent Contrast to maximum, and Brightness to mid position. 3. Connect a DC volt meter between pins 2 and 5 of the DT connector. (Positive lead to pin 2) 4. Activate the Conv-Misc Mode. 5. Select Item 1 HVOL (screen goes black). 6. Adjust Item 1 HVOL for 9V 0.1V on the meter. 7. Save data and exit the Conv-Misc mode. 8. Confirm that the voltage does not change more than 0.15V. Note: This adjustment must be performed if E2RESET is activated.

CONVERGENCE MODE Acivate ..MENU-1-2-5-9 Misc. ."6" Coarse..."5" Fine ..."4" Color (R,G or B)AUDIO Item No...VIDEO Adjust/Move.ADJUST Cursor Toggle...ENTER Save & Exit..MENU (twice)

[Video Circuit] 4. Main/Sub Y Level
Measuring Instrument Test Point Ext. Trigger Measuring Range Input Signal Input Terminal Oscilloscope GJ-16, GJ-5 ----------Color Bars Video Input

Purpose Symptom:
1. 2. 3. 4. 5. 6.

To set picture luminance Excess or insufficient brightness.

Supply a color bar signal to a Video Input (not an RF input). Select the color bar signal for both the main and sub pictures. Connect the oscilloscope to connector GJ pin 16. Activate the Service Mode Select Item 3 YDRM in the Main Matrix function. Adjust the data for 0.7 Vp-p max. - 0.67 Vp-p min. at GJ pin 16. (If it cannot be adjusted within this range, set to the lower value) 7. Move the oscilloscope to GJ pin 5. 8. Select Item 2 YDRS in the Sub Matrix function. 9. Adjust the data for 0.7 Vp-p max. - 0.67 Vp-p min. at GJ pin 16. (If it cannot be adjusted within this range, set to the lower value)

SERVICE MODE Activate .. MENU-1-2-5-7 Function .....AUDIO Item No. ..VIDEO Adjust Data ..ADJUST Save Data . ENTER Exit ..MENU (twice)

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MODELS: VS-50805 / VS-60805 / WT-46805 / WS-55805 / WS-55905 / WS-65905 / WS-73905
[Video Circuit] 5. Sub Picture Tint (V16N only)
Measuring Instrument Test Point Ext. Trigger Measuring Range Input Signal -------------------NTSC

Purpose:

To match the sub picture color to that of the main picture.

Symptom: Sub picture color differs from the main picture.
1. 2. 3. 4. 5. Supply an NTSC signal. Select the NTSC signal as the source for both the main and sub pictures. Activate the Adjustment mode. Select Item 1 TNTS in the Sub Matrix Function. Adjust data to match the sub picture color to that of the main picture.

.

Input Terminal RF or Video

SERVICE MODE Activate .. MENU-1-2-5-7 Function .....AUDIO Item No. ..VIDEO Adjust Data ..ADJUST Save Data . ENTER Exit ..MENU (twice)

[Video Circuit] 6. Side by Side Sub Pict. Tint (V16W only)
Measuring Instrument Test Point Ext. Trigger Measuring Range Input Signal ------------------NTSC

Purpose

To match the sub picture color to that of the main picture.

Symptom: Main and sub pictures colors differ.

1. 2. 3. 4. 5.

Supply an NTSC signal. Select the NTSC signal as the source for both the main and sub pictures. Activate the Adjustment mode. Select Item 1 TNTS in the Sub Matrix Function. Adjust data to match the sub picture color to that of the main picture. (If 1 TNTS range is short, adjust Items 4 VPDS and 5 UPDS)

Input Terminal RF or Video

SERVICE MODE Activate .. MENU-1-2-5-7 Function .....AUDIO Item No. ..VIDEO Adjust Data ..ADJUST Save Data . ENTER Exit ..MENU (twice)

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MODELS: VS-50805 / VS-60805 / WT-46805 / WS-55805 / WS-55905 / WS-65905 / WS-73905
[Video Circuit] 7. Side by Side Color (V16W only)
Measuring Instrument Test Point Ext. Trigger Measuring Range Input Signal Input Terminal Oscilloscope GH-5 -----200mV/div 20usec/div Color Bars Video Input

Purpose: Symptom:

To set the sub picture color level. Main and sub pictures color levels differs.

Note: Let the set run for at least one minute before making this adjustment. 1. Supply a color bar signal. 2. Select the color bar signal as the source for both the main and sub picture. 3. Connect an oscilloscope to pin 5 of the GH connector. 4. Activate the Side by Side mode. 5. Activate the Service Mode 6. Select Item 2 COLS in the Sub Matrix function. 7. Adjust data so the amplitude of the Sub signal equals that of the main signal.

SERVICE MODE Activate .. MENU-1-2-5-7 Function .....AUDIO Item No. ..VIDEO Adjust Data ..ADJUST Save Data . ENTER Exit ..MENU (twice)

[Video Circuit] 8. PIP Cb, Cr Offset (V16N only)
Measuring Instrument Test Point Ext. Trigger Measuring Range Input Signal Input Terminal ------------------Grayscale Video Input

Purpose Symptom:
1. 2. 3. 4. 5.

To set grayscale of the sub picture. Difference in grayscale between the main and sub pictures.

Supply a gray scale signal to a Video Input. Select the grayscale signal for both the main and sub pictures. Activate the Service Mode Select Items 46 PDU and 47 PDV in the PIP function. Set the data to the option in the table below the matches sub picture gray to main picture gray.

Option 1 2 3 4

46 PDU 0 0 15 15

47 PDU 0 15 0 15

SERVICE MODE Activate .. MENU-1-2-5-7 Function .....AUDIO Item No. ..VIDEO Adjust Data ..ADJUST Save Data . ENTER Exit ..MENU (twice)

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MODELS: VS-50805 / VS-60805 / WT-46805 / WS-55805 / WS-55905 / WS-65905 / WS-73905
[CRT Circuit] 9. CRT Cutoff
Measuring Instrument Test Point Ext. Trigger Measuring Range Input Signal Input Terminal Oscilloscope TP6R, TP6G, TP6B -----50V/Div. 2msec/Div. None Video Input

Purpose:

To set the cutoff point for all three CRTs.

Symptom: Monochrome has a color tint, or incorrect brightness.
Note: In the V16W chassis, use the Expand mode (full screen) (Refer to page 42 for Test Point locations.) 1. Select an External Input with no signal. 2. Enter the Service Mode, Video/Chroma Function. 3. Set the data to the values given in the table below. 4. Connect the oscilloscope to TP6R. 5. Adjust the Red Screen VR so the black level is 200V, as shown below, or 209.5V 1VDC using an DC Voltmeter. 6. 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. .

VIDEO / CHROMA Function Item # Abbrev. Data 1 SCT 42 2 SBRT 18 5 SCON 2 6 RDRH 42 7 GDR 50 8 BDRH 42 9 CTRH 15 10 CTGH 50 11 CTBH 15 18 BRT 31 19 COL 0

SERVICE MODE Activate .. MENU-1-2-5-7 Function .....AUDIO Item No. ..VIDEO Adjust Data ..ADJUST Save Data . ENTER Exit ..MENU (twice)

[CRT Circuit] 10. White Balance (NTSC)
Measuring Instrument Test Point Ext. Trigger Measuring Range Input Signal Input Terminal DC Voltmeter R6R18, R6G18, R6B18 ----------NTSC White Raster RF or Video

Purpose

To set the CRTs white level in the NTSC mode.

Symptom: Monochrome has a color tint.
Note: In the V16W chassis, use the Expand mode (full screen) (Refer to page 42 for Test Point locations.) 1. Supply a full White Raster Signal 2. Activate the Service Mode, Video/Chroma function. 3. Set the data for Item 19 COL to 0. 4. Adjust Items 6 RDRH and 8 BDRH for optimum white at the center of the screen. 5. Reduce the input luminance level to 25%. 6. Adjust Items 9 CTRH and 11 CTBH for optimum white. 7. Maximum Beam Current Check, set the signal luminance to 100%. Measure the voltage across each CRTs series cathode resistor (R6R18 for Red, R6G18 for Green and R6B18 for Blue) Calculate current by dividing the voltage by 220. Beam current must not exceed that given in the table below. 8. Adjust Items 12 RDRL and 13 BDRL for optimum white at the center of the screen. 9. Reduce the luminance level to 25%. 10. Adjust Item 14 CTRL and 16 CTBL for optimum white. 11. Set the data for Item 19 COL back to 31.

SERVICE MODE Activate .. MENU-1-2-5-7 Function .....AUDIO Item No. ..VIDEO Adjust Data ..ADJUST Save Data . ENTER Exit ..MENU (twice)

Maximum CRT Current CRT All Except Only WS-73905 WS-73905 RED 580 uA 900 uA GREEN 580 uA 900 uA BLUE 580 uA 900 uA

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MODELS: VS-50805 / VS-60805 / WT-46805 / WS-55805 / WS-55905 / WS-65905 / WS-73905
[CRT Circuit] 11. White Balance (HD)
Measuring Instrument Test Point Ext. Trigger Measuring Range Input Signal Input Terminal -----------------HD White Raster HD Input

Purpose: Symptom:
1. 2. 3. 4. 5.

To set the CRTs white level in the HD mode. Monchrome pictures have a color tint.

Supply an HD Full White Raster signal to the HD Inputs. Select the HD Inputs (Input button) Activate the Service mode, Video/Chroma Function. Set Item 19 COL to 0. Adjust Items 6 RDRH and 8 BDRH for optimum white at the center of the screen. 6. Reduce the input signal luminance to 25%. 7. Adjust Items 9 CTRH and 11 CTBH for optimum white. 8. Set the data for Item 19 COL back to 31.

SERVICE MODE Activate .. MENU-1-2-5-7 Function .....AUDIO Item No. ..VIDEO Adjust Data ..ADJUST Save Data . ENTER Exit ..MENU (twice)

[CRT Circuit] 12. Cb, Cr Offset
Measuring Instrument Test Point Ext. Trigger Measuring Range Input Signal Input Terminal ------------------White Raster (HD&NTSC) Video & HD Inputs

Purpose Symptom:

To set U and V color signal level. Incorrect colors.

NTSC Mode 1. Supply an NTSC White Raster (25% luminance) signal to a Video Input. 2. Activate the Service Mode, Video/Chroma Function 3. Set Item 19 COL data to 63. 4. Adjust Items 56 CRO1 and 57 CBO1 for optimum white. 5. Set Item 19 COL data to 31. 5. Save data and Exit the Service Mode. HD Mode 1. Supply a HD White Raster (25% luminance) signal to the HD Inputs. 2. Activate the Service Mode, Video/Chroma Function. 3. Set Item 19 COL data to 63. 4. Adjust Items 56 CRO1 and 57 CBO1 for optimum white. 5. Set Item 19 COL data to 26. 5. Save data and Exit the Service Mode.

SERVICE M ODE Activate .. MENU-1-2-5-7 Function .....AUDIO Item No. ..VIDEO Adjust Data ..ADJUST Save Data . ENTER Exit ..MENU (twice)

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MODELS: VS-50805 / VS-60805 / WT-46805 / WS-55805 / WS-55905 / WS-65905 / WS-73905
[Video Circuit] 13. Sub Contrast
Measuring Instrument Test Point Ext. Trigger Measuring Range Input Signal Input Terminal DC ma meter DN-2, DN-1 ---------Grayscale Video Input

Purpose:

To set overall beam current to its optimum level.

Symptom: Excess or insufficient contrast.
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Supply a Grayscale signal to a Video Input. Activate the Service Mode, Video/Chroma Function. Select Item 1 SCT, signal level automatically reduces. Connect a 3ma DC meter between DN connector pins 2 and 1. Positive lead to pin 2. Adjust Item 1 SCT for 400uA 20uA. Note the data value. Press Enter to same data. Remove the meter. Use the 3 button to toggle to the HD and 480P modes. Set the data for 1 SCT in both modes to the NTSC data value (Step 5). NOTE: Press ENTER to save data before switching modes. Save data and Exit the Service Mode.

SERVICE MODE Activate .. MENU-1-2-5-7 Function .....AUDIO Item No. ..VIDEO Adjust Data ..ADJUST Save Data . ENTER Exit ..MENU (twice)

[Video Circuit] 14. Black Level
Measuring Instrument Test Point Ext. Trigger Measuring Range Input Signal Input Terminal ------------------Monoscope Video Input

Purpose

To set the black level of the picture.

Symptom: Excess or insufficient brightness.

1. Supply a Monoscope signal to a Video Input. 2. Activate the Service Mode, Video/Chroma Function. 3. Adjust Item 2 SBRT so the 0% and 10% black levels on the gradation scale are the same. Make note of the data value. 4. Press ENTER to save data. 5. Use the 3 button to toggle to the HD and 480P modes. 6. Set the data for 2 SBRT in both modes to the NTSC data value (Step 3). NOTE: Press ENTER to save data before switching modes. 7. Exit the Service Mode.

SERVICE MODE Activate .. MENU-1-2-5-7 Function .....AUDIO Item No. ..VIDEO Adjust Data ..ADJUST Save Data . ENTER Exit ..MENU (twice)

40% 30% 20% 10% 50% 0% 0% 0%

60% 70% 80% 90%
GRADATION SCALE

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