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11. Focus Adjustment
Purpose: Set the optimum Focus. Symptom of Misadjustment: If Focus Adjustment is incorrect, blurred images are shown on the display. Test point --Tape --Adj. Point Focus Control M. EQ. Pattern Generator Mode --Input Monoscope Spec. See below.
The following 2 adjustments normally are not attempted in the field. They should be done only when replacing the CRT then adjust as a preparation.
14. Purity Adjustment
Purpose: To obtain pure color. Symptom of Misadjustment: If Color Purity Adjustment is incorrect, large areas of color may not be properly displayed. Test point Note: Focus VR (FBT) --- MAIN CBA FBT= Fly Back Transformer 1. Operate the unit more than 30 minutes. 2. Face the unit to the East and degauss the CRT using a Degaussing Coil. 3. Input the monoscope pattern. 4. Adjust the Focus Control on the FBT to obtain clear picture. --Tape --Adj. Point Deflection Yoke Purity Magnet M. EQ. Pattern Generator Figure Mode --Input *Red Color Spec. See below.
12. Head Switching Position Adjustment
Purpose: Determine the Head Switching Point during Playback. Symptom of Misadjustment: May cause Head Switching Noise or Vertical Jitter in the picture. Note: Unit reads Head Switching Position automatically and displays it on the screen (Upper Left Corner). 1. Playback test tape (FL8A, FL8N). 2. Enter the Service mode. (See page 1-4-1.) Then press the number "5" button on the remote control unit. 3. The Head Switching position will display on the screen; if adjustment is necessary follow step 4. 6.5H(412.7µs) is preferable. 4. Press "CH o" or "CH p" button on the remote control unit if necessary. The value will be changed in 0.5H steps up or down. Adjustable range is up to 9.5H. If the value is beyond adjustable range, the display will change as: Lower out of range: 0.0H Upper out of range: -.-H 5. Turn the power off and on again. GREEN RED BLUE
Fig. 5 * This becomes RED COLOR if push 7KEY with a service mode. 1. Set the unit facing east. 2. Operate the unit for over 30 minutes before adjusting. 3. Fully degauss the unit using an external degaussing coil. 4. Set the unit to the AUX mode which is located before CH2 then input a red raster from video in. 5. Loosen the screw on the Deflection Yoke Clamper and pull the Deflection Yoke back away from the screen. (See Fig. 6.) 6. Loosen the Ring Lock and adjust the Purity Magnets so that a red field is obtained at the center of the screen. Tighten Ring Lock. (See Fig. 5,6.) 7. Slowly push the Deflection Yoke toward the bell of the CRT and set it where a uniform red field is obtained. 8. Tighten the clamp screw on the Deflection Yoke.
13. CCS Text Box Location
When replacing the CRT, the CCS Box might not stay in appropriate position. Then, replace micro computer. Note: This adjustment automatically done by the microcomputer.
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T4501EA
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