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5-3-3. High Voltage Check
CAUTION There is no high voltage adjustment chassis. The B + power supply should be
+ 135 volts (see table 1).
1. Connect a digital voltmeter to the second anode of the picture tube.
2. Turn on the CCTV SET. Set the Brightness and Contrast controls to minimum.
3. Adjust the Brightness and Contrast controls to both extremes.
Ensure that the high voltage does not exceed Maximum High voltage (see table 1) under
any conditions.
INCH
21
5-3-4. FOCUS Adjustment
1. Input a cross dot signal.
2. Adjust the tuning control for clearest picture.
3. Adjust the FOCUS control for well defined scanning lines in the center area of the screen.
5-3-5. Screen Adjustment
1. Tune to the ACTIVE channel.
2. Adjust the FACTORY key is pressed on Remote Controller, Factory Mode shows up.
3. Selected OSD color is red.
4. When the VOL + key is pressed, the screen turns to one horizontal line.
5. Adjust SCREEN VR of FBT to make 1 dot bar.
6. After adjustment, once VOL + key is pressed again, it turns to FACTORY Mode.
5-3-6. Purity Adjustment
1. Warm up the receiver for at least 30 minutes.
2. Plug in the CRT deflection yoke. Tighten the clamp screw.
3. Plug the convergence yoke into the CRT and set it as shown in Fig. B-1.
4. Input a black and white signal.
5. Fully demagnetize the receiver by using an external degaussing coil.
6. Turn the CONTRAST and BRIGHTNESS controls to maximum.
7. Loosen the clamp screw holding the yoke. Slide the yoke backward or forward to produce a
vertical green belt. (Fig. B-2)
8. Tighten the convergence yoke.
+
B (Volts)
135
+
Table 1
B and Maximum High voltage
17
Maximum High Voltage
27 KV
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