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-UOMA/HOM A
Figure 11
B. WITH TEST EQUIPMENT
When measuring voltage with a VTVM, be sure to use the
test points located at the conductor side of the circuit
boards. Use an isolation transformer for these.
ONVERGEN E ADJUSTMENT
Note: Before any convergence adjustments are made
vertical neight and focus adjustment must be
completed.
1. Use 3 dot pattern to complete this adjustment.
2. The brightness level should be no higher than necessary
to obtain a clear pattern.
3. Loosen the convergence magnet clamp and converge the
red and blue dots at the center of the screen, by rotating
the R-8 Static Convergence Magnet. (See figure 7.)
4.
Align the converged red/blue dots with the green dots at
the center of the screen, by rotating the (RB)-G Static
Convergence Magnet. (See figure 7.)
5. Tighten the convergence magnet clamp.
6. Remove the DY wedges (see figure 7) and slightly tilt
(do not rotate) the deflection yoke horizontally and
vertically to obtain good overall convergence.
7. Secure the deflection yoke by reinserting the wedges.
(See figure 11.)
8. If purity error is found, repeat the purity adjustments.
N TE
1. Wedge A shown in figure 11 should be fixed within a
range of 0° — 30° to the left of the vertical line as shown
2. After inserting wedge A, insert wedges B and C.
The
wedges should be set 120° apart from each other.
3 Be certain that the three wedges are firmly fixed and the
Deflection Yoke is tightly clamped in place.
therwise
the Deflection Yoke may shift its position and cause a
loss of convergence and purity.
POWER LINE VOLTAGE (116V) ADJUSTMENT
1. Connect a voltmeter between TP91 and ground.
2. Adjust R809 to obtain a reading of 116.0 V ± 0.5 V.
HIGH VOLTAGE ADJUSTMENT
1. Adjust color temperature. (See color temperature adjust
ment.)
2. Slide the Service Switch to the Service position.
3. Use an electrostatic type high voltage meter to confirm
that the high voltage is within the range of 24.0 kV ±
1.0 kV.
4. If the high voltage is out of tolerance, adjust R809 until
the high voltage is within tolerance without over or
under going B+ voltage tolerance.
Note:
Be cartain that B+ is 116.0 V ± 0.5 V with beam
current at zero during the High Voltage Adjust
ment.
ABL ALIGNMENT
This is factory aligned.
Usually no further alignment is
required in the field. However, when the A-Board, or CRT
is replaced, the following alignment is necessary.
1. Set the monitor to receive a cross hatch pattern from a
video signal generator
2. Set Bright and Panabrite controls at each click position.
3. Connect the DC voltmeter between TP86 and TP87
(positive lead of the voltmeter to TP87 and negative lead
to TP86.)
4. Adjust the ABL control (R313) to obtain a voltmeter
reading of 6.0 V ± 0.2 V.
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8
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