Sony Trinitron KV-38DRC2, Service Manual

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KV-38DRC2 / 38DRC2C
The following adjustments should be made when a complete
realignment is required or a new picture tube is installed.
These adjustments should be performed with rated power supply
voltage unless otherwise noted.
The controls and switch should be set as follows unless otherwise
noted:
VIDEO MODE: STANDARD (RESET)
SECTION 2: SET-UP ADJUSTMENTS
Perform the adjustments in order as follows:
1. Beam Landing
2. Convergence
3. Focus
4. Screen (G2)
5. White Balance
Test Equipment Required:
1. Color Bar Pattern Generator
2. Degausser
3. DC Power Supply
4. Digital Multimeter
2-1. BEAM LANDING
Preparation:
• Input a white pattern signal.
• Face the picture tube in an East or West direction to reduce the
infl uence of geomagnetism.
NOTE: Do not use the hand degausser; it magnetizes the CRT .
1. Input white pattern from pattern generator. Set the PICTURE control
to maximum, and the BRIGHTNESS control to standard.
2. Perform Focus, G2 and White Balance adjustments.
3. Loosen the defl ection yoke mounting screw, and set the purity control
to the center as shown below:
Purity Control
4. Input a green pattern from the pattern generator.
5. Move the defl ection yoke backwards, and adjust with the purity control
so that green is in the center and red and blue are even on both
sides.
Blue Red
Green
6. Move the defl ection yoke forward, and adjust so that the entire screen
becomes green.
7. Switch over the raster signal to red and blue and confi rm the
condition.
8. When the position of the defl ection yoke is determined, tighten it with
the defl ection yoke mounting screw.
9. If landing at the corner is not right, adjust it by using the disk magnets.
Purity control
corrects this area.
Deflection yoke positioning
corrects these areas.
Disk magnets
or rotatable disk
magnets correct
thses areas (a-d).
b
d
a
c