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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
Adj. Point
---
Focus Control
Tape
M. EQ.
---
Pattern Generator
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 a
clear picture.
12. Head Switching Position
Adjustment
Purpose: Determine the Head Switching Position
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. Insert the test tape (FL8A, FL8N).
2. Set the unit to the stop condition.
3. Enter the Service mode. (See page 1-6-1.)
4. Press [PAUSE] button on the remote control unit.
5. Confirm that indication of OSD is 6.5H.
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.
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
Mode
Input
Purpose: To obtain pure color.
---
Monoscope
Symptom of Misadjustment: If Color Purity
Spec.
Adjustment is incorrect, large areas of color may not
be properly displayed.
See below
* This becomes RED COLOR if the [7] button is
pressed while in service mode.
1. Set the unit facing east.
2. Operate the unit for over 30 minutes before
3. Fully degauss the unit using an external
4. Set the unit to the AUX mode which is located
5. Loosen the screw on the Deflection Yoke Clamper
6. Loosen the Ring Lock and adjust the Purity
7. Slowly push the Deflection Yoke toward the bell of
8. Tighten the clamp screw on the Deflection Yoke.
1-6-6
Test Point
Adj. Point
Deflection Yoke
---
Purity Magnet
Tape
M. EQ.
---
Pattern Generator
Figure
GREEN
RED
adjusting.
degaussing coil.
before CH2 then input a red raster from video in.
and pull the Deflection Yoke back away from the
screen. (See Fig. 7.)
Magnets so that a red field is obtained at the
center of the screen. Tighten Ring Lock. (See Fig.
6, 7.)
the CRT and set it where a uniform red field is
obtained.
Mode
Input
---
*Red Color
Spec.
See below
BLUE
Fig. 6
T5517EA
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