Section 2: Set-Up Adjustments; 2-1. Beam Landing - Sony Trinitron KV-29DRC420 Service Manual

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)

2-1. BEAM LANDING

Preparation:
• Use cross hatch signal to rough adjust focus, G2 and then input a
white pattern signal.
• Face the picture tube in an East or West direction to reduce the
infl uence of geomagnetism.
• CXA2170-D4 Confi rm Focus data - See 2.4.1 Dynamic Focus/
Dynamic Quadrapole Data Table 1.
• CXA8070 (Should be set to default) - or unplug CN1 from DY.
CXA8070 default (initial) data: (See 4-4. SERVICE DATA for the
default data values for YBWU, YBWL, RSAP, RUBW, RUMB, RLBW,
RLMB1, LSAP, LUBW, LUMB, LLBW, LLMB, CADJ, HVCA)
• CXA2170-D1, -D2 table default (initial) data: (See 4-4. SERVICE
DATA for the default data values for VCEN, VPIN, HTPZ, HCNT,
PPHA, VANG, VBOW, LBOW LANG)
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. Loosen the defl ection yoke mounting screw, and set the purity
control to the center as shown below:
3. Input a green pattern from the pattern generator.
4. Move the defl ection yoke backwards, (See Figure 1) and adjust with
the purity control so that green is in the center and red and blue are
even on both sides.
KV-27HS420/29DRC420/30HS420/32HS420/34HS420/36HS420

SECTION 2: SET-UP ADJUSTMENTS

Purity Control
KV-27HS420/29DRC420/30HS420/32HS420/34HS420/36HS420
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
5. Move the defl ection yoke forward, and adjust so that the entire screen
becomes green.
Figure 1
6. Switch over the raster signal to red and blue and confi rm the
condition.
7. When the position of the defl ection yoke is determined, tighten it with
the defl ection yoke mounting screw.
8. If landing at the corner is not right, adjust it by using the disk
magnets.
Disk magnets
or rotatable disk
magnets correct
these areas (a-d)
b
d
Blue Red
Green
Purity control
corrects this area
a b
c d
Deflection yoke positioning
corrects these areas
(Check Areas)
a
c
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