Panasonic TX-21RX20T Service Manual ▷ View online
ADJUSTMENT OF CONVERGENCE
1. INSTRUMENT
a. Helmhortz device
2. PREPARATION
a. Set the Helmhortz device to local magnetic field.
Horizontal : 0 ± 0.03 × 10-4T
b. Receive the crosshatch pattern.
c. Picture menu : DYNAMIC Normal and adjust BRIGHT DAC until gray portion of crosshatch.
d. Set DY to CRT not to tilt (up and down and left right).
c. Picture menu : DYNAMIC Normal and adjust BRIGHT DAC until gray portion of crosshatch.
d. Set DY to CRT not to tilt (up and down and left right).
3. ADJUSTMENT
a. Static Convergence Adjustment
a. Make sure that the magnets are positioned as shown as in Fig. 1.
b. Adjust the 4-pole magnets (Fig. 1) to align centre dots of R and B adjust 6-pole magnets to align centre dots to G.
c. After adjustment, secure magnets with magnet lock of white lacquer.
b. Adjust the 4-pole magnets (Fig. 1) to align centre dots of R and B adjust 6-pole magnets to align centre dots to G.
c. After adjustment, secure magnets with magnet lock of white lacquer.
• Beams move with rotating when static magnet is turned. Rotational reduce of beams differs by angle of two
magnets. Therefore, repeat magnet adjustment several times so that all are aligned completely.
b. YHC, YV, XV Adjustment (Fig. 2)
a. Adjust that static and Dynamic convergence is best with YHC VR, YV VR and XV coil. In case static convergence is
tilted, repeat (1) Static Convergence Adjustment.
c. Dynamic Convergence Adjustment
a. When dynamic convergence is bad, fix permalloy between neck and DY so that dynamic convergence best.
Fig. 1
4. CONFIRM THAT LEFT UPPER SIDE LINE IS STRAIGHT.
When left upper side line is not straight, put magnet on DY and adjust the left upper side line so it is straight.
Fig. 2
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TX-21RX20T
ADJUSTMENT OF CRT VRS
1. PREPARATION
a. Set DY to CRT not to tilt up and down left and right deflection. (Fig. 1)
b. Set CY to CRT and set CY magnet primarily.
b. Set CY to CRT and set CY magnet primarily.
Pur Mg : Set Pur Mg so that 2 magnets are horizontal position.
VRS Mag : Set VRS Mg so that 2 magnets are top position.
VRS Mag : Set VRS Mg so that 2 magnets are top position.
c. Set geomagnetic correction DAC. As in TABLE 1.
2. ADJUSTMENT
a. Receive the white balance pattern.
b. Adjust V-CENTER.
c. Set R,B CUT OFF to minimum, and set G CUT OFF to centre.
d. Receive the aging pattern.
e. Set 2 magnets of vertical position to up and down equally so that centre part of CRT. (Fig. 2)
b. Adjust V-CENTER.
c. Set R,B CUT OFF to minimum, and set G CUT OFF to centre.
d. Receive the aging pattern.
e. Set 2 magnets of vertical position to up and down equally so that centre part of CRT. (Fig. 2)
MANUAL
DAC
0
TABLE 1
Fig. 1
Fig. 2
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TX-21RX20T
TERRESTRIAL MAGNETISM CIRCUIT CONFIRMATION
1. CONFIRMATION OF GEOMAGNETIC CIRCUIT
a. Select GEOMAGNETIC mode in PRESET MENU.
b. Confirm that it leans right side as shown (Fig. 1), when change the DAC (*).
c. Confirm that it leans left side as shown (Fig. 1), when change the DAC (**).
d. Confirm that purity is changed, when changing the DAC.
e. Set Geomagnetic DAC as in TABLE 1.
b. Confirm that it leans right side as shown (Fig. 1), when change the DAC (*).
c. Confirm that it leans left side as shown (Fig. 1), when change the DAC (**).
d. Confirm that purity is changed, when changing the DAC.
e. Set Geomagnetic DAC as in TABLE 1.
Fig. 1
MANUAL
DAC
0
TABLE 1
MANUAL
*DAC
-1 ~ -8
**DAC
+1 ~ +8
TABLE 2
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TX-21RX20T
FOCUS ADJUSTMENT
1. PREPARATION
a. Receive crosshatch pattern E-4
b. Picture menu : DYNAMIC NORMAL
b. Picture menu : DYNAMIC NORMAL
2. ADJUSTMENT
a. Adjust focus VR for best position.
Adjust focus base on no. 6 line
Fig. 1. Crosshatch Pattern
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TX-21RX20T
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