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AKAI CT-2862 UNT
Adjustments
Test Equipment: VIF Sweep Generator; SIF Sweep Generator; Colour Bar/Dot/Cross Hatch Generator; DC Power Supply (14V); Oscilloscope; Vacuum Tube Voltmeter; Volt Ohmmeter; High Voltage Meter; Ampere Meter (0.5 Class, DC 3mA Max.). Demagnetizing Coil; Philips Pattern Generator; Frequency Counter; Continuous Waveform Generator.
TV SECTION (See Table Opposite)
15. FM SOUND LEVEL ALIGNMENT
1.Receive a colour bar signal with Nicam and FM 1KHz sound.
2.Connect the voltmeter to speaker ‘+‘ and ‘GND’.
3.Select the TV set to NICAM mode and set the volume level to 0.5W.
4.Change to FM mode and Adjust the VR1101 until the reading same as NICAM mode± 1dB.
16. PIN CUSHION ADJUSTMENT
1.Receive the Philips Pattern signal.
2.Adjust the H.SIZE control (755) until overscan.
3.Adjust the TRAPEZIUM control (756) until the pattern minimum distortion.
4.Adjust the EASTWEST control (757) until the Pin Cushion minimum distortion.
5.Adjust the TOP LINE control (758) until the vertical line minimum distortion.
17. COLOUR PURITY ADJUSTMENT (SEE FIG.5)
BEFORE ALL ADJUSTMENT DESCRIBED ARE ATTEMPTED, V-HOLD, H-HOLD, V-HIGH, B+ VOLTAGE AND FOCUSING ADJUSTMENT MUST BE COMPLETED.
1.Place the TV receiver facing NORTH or SOUTH.
2.Plug in TV receiver and turn in on.
3.Operate the TV receiver over 30 minutes.
4.Fully degauss the TV receiver by using an external degaussing coil.
5.Receive a crosshatch pattern and adjust the static convergence, control roughly.
6.Loosen the clamp screw of the deflection yoke and pull the deflection yoke towards you.
7.Fully turn the red and blue Drive (VR504, VR505) controls counter-clockwise.
8.Adjust the purity magnets so that green field is obtained at the center of the screen.
9.Slowly push the deflection yoke towards bell of CRT and set it where a uniform green field is obtained.
10.Tighten the clamp screw of the deflection yoke.
18. CONVERGENCE ADJUSTMENT (SEE FIG.5)
1.Receive a dotted pattern.
2.Unfix the convergence magnet damper and align red with blue dots at the center of the screen by rotating (RB) static conver gence magnets.
3.Align Red/Blue with green dots at the center of the screen by rotating (RB-G) static convergence magnet.
4.Fix the convergence magnets by turning the damper.
5.Remove the DY wedges and slightly tilt the deflection yoke horizontally and vertically to obtain the good overall covergence.
6.Fix the deflection yoke by wedges.
7.If purity error is found, follow “PURITY ADJUSTMENT” instructions.
Fig. 1 |
Fig. 1a |
Fig. 2 |
Fig. 3 |
Fig. 4 |
Fig. 5 |
Fig. 6 |
Fig. 7 |
AKAI CT-2862 UNT
AV Switching Diagram
Waveforms
Pin Cushion
Diagram
Front LED
Diagram
Text Diagram
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