Mitsubishi WS-73909 Service Manual download pdf (Page 36)

Page 36

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-55859 / WS-55909 / WS-65869 / WS-65909 / WS-73909

-----

------

Monoscope

Video Input

[Video Circuit]

11. Black Level

To set the black level of the picture.

Excess or insufficient brightness.

1. Supply a Monoscope signal to a Video Input.

2. Activate the Adjust Mode, VC Function.

3. Adjust Item 2 SBRT so the 0% and 10% black levels on the gradation scale

are the same.

4. Press ENTER to save data.

7. Exit the Service Mode.

40% 30% 20% 10%

50% 0% 0% 0%

60% 70% 80% 90%

GRADATION SCALE

DC ma meter

DT connector pins 7 & 8

------

-----

Grayscale

RF Input

To set overall beam current to its optimum level.

Excess or insufficient contrast.

Note: Activate the Expand mode (full screen).

1. Supply a Grayscale signal to a RF Input.

2. Activate the Adjust Mode, VC Function.

3. Select Item 1 SCT, signal level automatically reduces.

4. Connect a 3ma DC meter between DT connector pins 7 and 8. Positive lead to

pin 7.

5. Adjust Item 1 SCT for 615µA ±10µA (645µa ±10µa on the WS-73909).

6. Remove the meter.

7. Save data and Exit the Service Mode.

[Video Circuit]

12. Sub Contrast

CIRCUIT ADJUST MODE

Activate .. MENU-0-1-5-7

Function .....AUDIO

Item No. ..VIDEO

ust Data ..ADJUST

Save Data . ENTER

Exit ..MENU

(

twice

)

CIRCUIT ADJUST MODE

Activate .. MENU-0-1-5-7

Function .....AUDIO

Item No. ..VIDEO

ust Data ..ADJUST

Save Data . ENTER

Exit ..MENU

(

twice

)

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Mitsubishi WS-73909 Service Manual Page 36

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