Panasonic PV-M1327 Service Manual page 49

STATIC CENTRAL CONVERGENCE
ADJUSTMENT
Purpose:
To set the uniform convergence over the whole screen.
Symptom of Misadjustment:
The convergence on the screen will vary from the center
portion to the surrounding edges.
Adjustments : Pair of 4-Pole Convergence Magnet Rings,
Pair of 6-Pole Convergence Magnet Rings
Specification: Refer to descriptions below.
Input : Video Input Jack
Crosshatch Pattern Signal
Mode : STOP
Equipment : Oscilloscope
1. Supply a Crosshatch Pattern Signal to the Video Input
Jack.
2. Turn the Pair of 4 - Pole Convergence Magnet Rings so that
B and R, at center of CRT, overlap each other.
3. Turn the Pair of 6 - Pole Convergence Magnet Rings so that
B and R, that overlapped each other in step 2 overlaps G.
DYNAMIC CONVERGENCE ADJUSTMENT
Purpose:
To set the uniform convergence over the whole screen.
Symptom Misadjustment:
The convergence on the screen will vary at the sides of the
CRT.
Adjustment : Deflection Yoke (CRT Unit)
Specification: Refer to descriptions below.
Input : Video Input Jack
Crosshatch Pattern Signal,
White Pattern Signal
Mode : STOP
Equipment : Oscilloscope
1. Supply a Crosshatch Pattern Signal to the Video Input
Jack.
2. Hold the Deflection Yoke and wiggle it up and down to
produce the correct Crosshatch Pattern position.
Fig. E9-1
3. Hold Deflection Yoke and wiggle it horizontally (right to left)
to produce the correct Crosshatch Pattern position.
4. Insert three wedges to maintain the correct Crosshatch
Pattern Position.
Wedge Positions
(Model: A, B, C, D, E)
A
C
Wedges (Rear View)
(Confirmation of white)
1. Supply a White Pattern Signal to the Video Input Jack.
2. Confirm that the purity is still correct.
3. If the purity is not acceptable, readjust the purity.
4. (Model: F, G, H, I)
If the convergence error is more than 1.5mm (0.06 inch)
from the green dot at each corner, adjust the convergence
at that corner with a Permalloy Magnetic Strip. Insert a
permalloy strip into the gap between the Deflection Yoke
and the CRT along a diagonal line of the CRT bell. Adjust
it for the best possible convergence. Use one Permalloy
Magnetic Strip in each corner if necessary.
Permalloy Magnetic Strip Part Number (TSM10032-2).
(Model: F, G, H, I)
Permalloy Magnetic Strip
CRT
Adhesive
portion
Magnetic
portion
2-31
Fig. E9-2
(Model: F, G, H, I)
A
B C
Wedges (Rear View)
Fig. E9-3
Magnetic portion
Adhesive
portion
DY
Permalloy Magnetic Strip
Fig. E9-4
B