Wells-Gardner D9100 Series, Service Manual

7. ADJUSTMENT 

SPECIFICATION: 

7-1. Adjustment 

Sequence: 

The monitor requires a  minimum of 15 minutes of warm up time before adjustment. 

7-2. Adjustment 

Sequence: 

FBT B+ Voltage 

→

 G2 Voltage 

→

 Hor. Center 

→

 Hor. Size 

→

 Hor. Position 

→

 Ver. 

Size 

→

Ver. Position 

→

 Side-pin 

→

 Trapezoid 

→

Focus 

→

 White Balance 

→

 Convergence 

 
7-3. Adjustment 

Procedure. 

How to enter the Factory Mode: Press Menu and Down simultaneously and hold down 
for three seconds.  Adjust BRIGHTNESS and CONTRAST to “50” amplitude. 

7-3.1  FBT B+ voltage adjustment. 

1. 

Input the crosshatch pattern with the 31KHz 640*480 mode. 

2. 

After connecting a digital voltmeter to D316, cathode and the frame ground,  
adjust FBT B+ voltage to 76V +/- 0.5V using VR301. 

 
7-3.2  G2 Voltage adjustment. 

1. 

Input the crosshatch pattern with 31 KHz 640*480 mode 

2. 

After connecting a DC high voltage meter to the G2 of the CRT socket, adjust 
G2 voltage to 450 +/- 10V by changing SCREEN VR of FBT. 

 
7-3.3 Geometry/Display 

Adjustment. 

Refer to controls and adjustment (Article 6) 

7-3.4 Focus 

Adjustment 

1. 

Input the “H” character pattern with 31 KHz 640*480 

2. 

Adjust the focus for the best balance at each point of

 A,B,C,D,E as 

shown 

below by rotation the focus VR of FBT

3. 

For Dual Focus 17” monitors, adjust FOCUS 1 and FOCUS 2 for sharpest 
horizontal and vertical lines on a crosshatch pattern in oval area from point B 
to point C of display. Check overall focus in center and corners.

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