SONY PVM20N6A
Service Manual

3-6. CONVERGENCE ADJUSTMENT
1. Input the dot pattern signal. Set CONTRAST to the position at which it can be seen clearly. Set BRIGHTNESS to MIN. 2. Align the R, G, B dots in the horizontal direction at the center of the screen using RV703 (H-STAT). Note: If H-CENT was changed after adjusting HSTAT, adjust H-STAT again. (The HSTAT can be changed by the H-CENT switch.) 3. Align the top and bottom of R, G, B at the center of the screen using the V-STAT (vertical static convergence) magnets. Note: After the V-STAT adjustment, always paint the magnets to lock.
I I' I I'

5. For VMC, use a 6-pole magnet to adjust so that the R and B dots are symmetrical above and below the G dot.
R (Top section) Fixed G B

(Bottom section)

6-pole magnet Perform the VMC adjustment by rotating the 6-pole magnet to the left and right without changing the opening of it.

Adjust so that the displacement of the dot is equal at the top and bottom.

A

B

A

B

6. Repeat steps 2 to 5 until the convergence becomes correct. Note: Adjusting the convergence may affect the landing. Therefore be sure to check the landing again after completing this adjustment. 7. After adjusting, paint each magnet to lock them.
14-inch

X

X

Y Good example

Y Bad example

V.STAT convergence magnet Purity BMC magnet

While maintaining the V-STAT magnet knobs A and B at the same angle (I = I'), adjust the top and bottom convergences. If A and B are asymmetrical (I = I'), it will have a negative effect; the focus may not be accurate, or the beam striking may occur. 4. For HMC, use a 6-pole magnet and adjust so that the R and B dots are symmetrical at the left and right sides in respect to the G dot.
I I' R G B
20-inch V.STAT convergence magnet

A

B A A'

Purity BMC magnet

6-pole magnet Perform the HMC adjustment by changing the opening of the 6-pole magnet.

Adjust the 6-pole magnet so that A = A'. While maintaining the I and I' angles equal, adjust the 6-pole magnet.

3-6

SIIA Chassis