PURITY & CONVERGENCE ADJUSTMENT
Caution:
Convergence and Purity have been factory aligned. Do not5.Reconnect the internal degaussing coil.
attempt to tamper with these alignments.
However, the effects of adjacent receiver components, or6. Position the beam bender locking rings at the 9 o'clock
replacement of picture tube or deflection yoke may require theposition and the other three pairs of tabs (2,4 and 6 pole
need to readjust purity any convergence.magnets) at the 12 o'clock position.
DEFLECTION YOKE6-POLE
6-POLE
PURITY &CONVERGENCEMAGNETS
MAGNES
MAGNET ASSEMBLYPURITY MAGNET(2-POLE)
6-POLE
4-POLE
X-AXIS YOKEMAGNET
POSITIONING
(L/R PURITY)
RUBBER
WEDGES
PURITY MAGNET
4-POLE
GLASS CLOTH TAPECONVERGENCE MAGNET ASSEMBLY
CONVERGENCE MAGNET ASSEMBLY
! Purity Adjustment
This procedure DOES NOT apply to bonded yoke and picture7. Perform the following steps, in the order given, to prepare the
tube assemblies.receiver for the purity adjustment procedure.
The instrument should be at room temperature (60 degrees F or
above) for six (6) hours and be operating at low beam currenta. Face the receiver in the "magnetic north" direction.
(dark background) for approximately 20 to 30 minutes before
performing purity adjustments.b. Externally degauss the receiver screen with the television
power turned off.
CAUTION:Do not remove any trim magnets that may be
attached to the bell of the picture tube.c. Turn the television on for approximately 10 seconds to
perform internal degaussing and then turn the TV off.
1. Remove the AC power and disconnect the internal
degaussing coil.d. Unplug the internal degaussing coil. This allows the
thermistor to cool down while you are performing the purity
2. Remove the yoke from the neck of the picture tube.adjustment. DO NOT MOVE THE RECEIVER FROM ITS
"MAGNETIC NORTH" POSITION.
3. If the yoke has the tape version beam bender, remove it and
replace it with a adjustable type beam bender (follow thee. Turn the receiver on and obtain a red raster by increasing
instructions provided with the new beam bender)the red bias control (CW) and decreasing the bias controls
for the remaining two colors (CCW).
4. Replace the yoke on the picture tube neck, temporarily
remove the three (3) rubber wedges from the bell of thef. Attach two round magnets on the picture tube screen at 3
picture tube and then slide the yoke completely forward.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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ACEC
