Panasonic PV-M1348 Service Manual page 55

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.
Test Point : ----------
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 : NTSC Video Pattern Generator
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.
Test Point : ----------
Adjustment : Deflection Yoke (CRT Unit)
Specification: Refer to descriptions below.
Input : Video Input Jack
Crosshatch Pattern Signal,
White Pattern Signal
Mode : STOP
Equipment : NTSC Video Pattern Generator,
White Pattern Generator
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. E10-1
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.
(Model: A, B, C, D, E, F)
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: G, H, I, J, K)
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: G, H, I, J, K)
Permalloy Magnetic Strip
CRT
Adhesive
portion
Magnetic
portion
2-32
Fig. E10-2
Wedge Positions
(Model: G, H, I, J, K)
A
B C
Wedges (Rear View)
Fig. E10-3
Magnetic portion
Adhesive
portion
DY
Permalloy Magnetic Strip
Fig. E10-4
B