Text preview for : High_Voltage_Adjustment.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)



Back to : Mitsubishi VS-50805, 6080 | Home

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)

Page 44