LG - Service-Handbuch - Seite 14

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Caution:

Convergence and Purity have been factory aligned. Do not

attempt to tamper with these alignments.

However, the effects of adjacent receiver components, or

replacement of picture tube or deflection yoke may require the

need to readjust purity any convergence.

¡ Purity Adjustment

This procedure DOES NOT apply to bonded yoke and picture

tube assemblies.

The instrument should be at room temperature (60 degrees F or

above) for six (6) hours and be operating at low beam current

(dark background) for approximately 20 to 30 minutes before

performing purity adjustments.

CAUTION: Do not remove any trim magnets that may be

attached to the bell of the picture tube.

1. Remove the AC power and disconnect the internal

degaussing coil.

2. Remove the yoke from the neck of the picture tube.

3. If the yoke has the tape version beam bender, remove it and

replace it with a adjustable type beam bender (follow the

instructions provided with the new beam bender)

4. Replace the yoke on the picture tube neck, temporarily

remove the three (3) rubber wedges from the bell of the

picture tube and then slide the yoke completely forward.

PURITY & CONVERGENCE ADJUSTMENT

5. Reconnect the internal degaussing coil.

6. Position the beam bender locking rings at the 9 o'clock

position and the other three pairs of tabs (2,4 and 6 pole

magnets) at the 12 o'clock position.

X-AXIS YOKE

POSITIONING

(L/R PURITY)

CONVERGENCE MAGNET ASSEMBLY

7. Perform the following steps, in the order given, to prepare the

receiver for the purity adjustment procedure.

a. Face the receiver in the "magnetic north" direction.

b. Externally degauss the receiver screen with the television

power turned off.

c. Turn the television on for approximately 10 seconds to

perform internal degaussing and then turn the TV off.

d. Unplug the internal degaussing coil. This allows the

thermistor to cool down while you are performing the purity

adjustment. DO NOT MOVE THE RECEIVER FROM ITS

"MAGNETIC NORTH" POSITION.

e. Turn the receiver on and obtain a red raster by increasing

the red bias control (CW) and decreasing the bias controls

for the remaining two colors (CCW).

f. Attach two round magnets on the picture tube screen at 3

o'clock and 9 o'clock positions, approximately one (1) inch

from the edge of the mask (use double-sided tape).

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6-POLE

MAGNETS