High Voltage Control; Focus Adjustments - Mitsubishi VS-60609 Service Manual

MODELS: VS-45609 / VS-50609 / VS-55609 / VS-60609 / VS-60719 / VS-70709
[High Voltage Circuit]

3. High Voltage Control

Measuring
DC Voltmeter
Instrument
+ Lead to DT #5
Test Point
- Lead to DT #4
------
Ext. Trigger
Measuring
-------
Range
Input Signal
Monoscope
Input Terminal
Video Input
[Focus]
4. Dynamic Focus
Measuring
------
Instrument
--------
Test Point
------
Ext. Trigger
Measuring
-------
Range
Input Signal
Monoscope
Video Input
Input Terminal
Purpose: To set the CRTs anode voltages
Dark picture.
Symptom:
1. Supply a Monoscope signal to a Video Input.
2. Connect a DC Voltmeter to pins 4 and 5 of the DT connector.
• Positive Lead to DT #5
• Negative Lead to DT #4
3. Set Contrast to maximum, and Brightness to the center position.
4. Enter the Service Mode and check that Item "7 BRTH" under the VCJ Function is
set at 31.
5. Press Enter and Exit the Service Mode.
6. Enter the Convergence Mode and select the Conv. Misc Function.
7. Select Item "1 HVOL" (screen goes black).
8. Adjust "1 HVOL" for 0.15 ±0.01 V on the meter.
9. Exit the Convergence Mode and verify that the meter reading does not exceed
0.85V.
Note: HV must be reset if E2RESET is activated.
SERVICE MODE
Activate ........ MENU-0-1-5-7
Function .................AUDIO
Item No. .................VIDEO
Adjust Data ...........ADJUST
Save Data .... .........ENTER
Exit ..............MENU (twice)
Purpose: To improve edge focus
Symptom: Blurred picture at the edges of the screen.
1. Supply a Monoscope signal to the Video Input.
2. Enter the Coarse Convergence Mode and select the DF Function.
3. Verify that the data values are set as indicated in the table below.
4. Exit the Convergence Mode.
DF Function
Item Abbrev. Data
0 DFH 200
1 DFV 100
Page 29
CONVERGENCE MODE
Activate ........MENU-0-1-5-9
Misc. ........................."6"
Coarse........................"5"
Fine ..........................."4"
Color (R,G B or DF)...AUDIO
Item No..................VIDEO
Adjust/Move..........ADJUST
Cursor Toggle.........ENTER
Save & Exit.....MENU (twice)
CONVERGENCE MODE
Activate ........MENU-0-1-5-9
Misc. ........................."6"
Coarse........................"5"
Fine ..........................."4"
Color (R,G B or DF)...AUDIO
Item No..................VIDEO
Adjust/Move..........ADJUST
Cursor Toggle.........ENTER
Save & Exit.....MENU (twice)