Safety Related Adjustment; Preparation; Hold-Down Confirmation And Readjustment - Sony SSM-Q177 Service Manual

Black and white quad monitor

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Operating instructions manual (48 pages)

Table of Contents

3-1. PREPARATION

Tools required

• Pattern generator

• DC power supply

3-2. HOLD-DOWN CONFIRMATION AND

READJUSTMENT

(

R406 : A Board)

Note :

The following adjustment should always be

performed when replacing the following

components (marked with

diagram).

:L901 (DY)

R406, R408, C415, C410, C414, D405 (A board)

1. Receive monoscope signal.

2. Set controls and switch as follows.

CONTRAST control ............. minimum

BRIGHT control .................... minimum

3. Apply an external DC voltage gradually to cathode of

D404, and when the voltage becomes 21 V DC, confirm

HOLD DOWN circuit operates immediately and raster

disappears.

4. When the voltage becomes 17 V DC, confirm HOLD

DOWN circuit does not operate.

5. If step 3 and 4 are not satisfied, replace R406 and repeat

above steps.

SSM-Q177/Q177CE

SECTION 3