Panasonic TX-21RX20M-MALAYSIA, Руководство по обслуживанию

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2.5.2. High Voltage
Item / preparation
1. Receive the crosshatch pattern.
2. Set to 0 Beam.
Screen VR .......... minimum
Contrast .............. minimum
Adjustment procedure
1. Connect a DC voltage meter to TPA 16 and confirm the +B voltage is 130.0 V ± 2.
2. Connect a high frequency voltmeter to heater and confirm that voltage reads 6.3 V (RMS) ± 0.24.
3. Normalize the brightness and contrast.
2.6. Adjustment of Purity
1. INSTRUMENTS
a. Purity Jig
b. Helmhortz device
2. PREPARATION
a. Set the Helmhortz device to local magnetic field.
Horizontal : 0 ± 0.03 × 10-4T
b. Aging should have been performed over 60 minutes.
c. Receive the purity pattern (White pattern).
d. Picture menu : CONTRAST ... Max. BRIGHT ... Max.
e. Set V-CENTER to [4].
f.
Static convergence should have been roughly adjusted.
g. Connect DC current meter through FBT (pin 3) and adjust to [1200 ± 10%] µA.
3. ADJUSTMENT
a. Set both purity magnet´s knobs to top.
b. Adjust the purity so that the markers on monitor scope of purity jig become symmetrical in horizontal direction.
c. Only for stripe CRT, correct vertical centre by purity magnet too.
d. Set up deflection yoke so that the position of deflection yoke becomes [10 µm ± 5] forward on monitor scope at this time by
attention note to tile deflection yoke.
e. Repeat procedures (a) ~ (d).
f.
Tighten deflection yoke band.
g. Adjust beam landing by microscope. (Only for model change or check instruments)
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TX-21RX20M-MALAYSIA