Zenith R50W46, Service Manual, Page: 12 / 58

These instructions are applied to only MP-03AA/B chassis.
Notes
1.Because this is not a hot chassis, it is not necessary to use
an isolation transformer.
However, the use of isolation transformer will help protect
test instrument.
2.Adjustments must be done in the correct order.
3.The receiver must be operated for about 60 minutes proir to
the adjustment.
Pre-heatrun must be operated receiving moving pictures or
100% white pattern.
[
Never operate the SET over 10 minutes with still picture
because a fluorescent material may get damage.
1. Raster Slant/Focus Adjustment
1-1. Preliminary steps
(1) Apply power to the unit and switch the unit ON.
(2) Receive the signal.
(3) Select INSTART key on the Service Remote and then
select “0 RASTER ADJ” move the cursor or by pressing
the key No. 0.
(4) Adjust Lens Focus/Electric focus temporarily.
[
When selecting “0 RASTER ADJ” mode after entering
adjustment mode with INSTART key, the convergence resets
and then preparation for adjustment complete.
[
The convergence reset is possible even from convergence
adjustment mode.
1) Enter into convergence adjustment mode: Select INSTART
key on the Service Remote and then select “3
CONVERGENCE” move the cursor or using the key No..
2) Convergence reset: After press the key No. 5, press the
ENTER key.
3) Adjustment mode release: Press the INSTART key
1-2. Adjustment
(1) Make Green raster by covering Red and Blue.
(2) Rotate Green DY and tilt the screen like figure below.
(3) Make 2 color raster with Red or Blue and Green.
(4) Coincide the slope of red and blue raster to that of green.
Note) 1. When adjusting raster slope, loosen the DY and fasten it
after adjusting.
2. Never rotate and adjust the fixed DY without loosing it.
(5) After adjustment complete, exit the RASTER adjustment
mode using ENTER key and exit the SVC adjustment
mode using INSTART key.
[
When release the RASTER adjustment mode using
ENTER Key it turns the data of the convergence with in
situ automatically and the adjustment is completed.
2. Beam Alignment Adjustment
2-1. Test Equipment
Video Test Generator(801GF) or Signal Generator that can
produce NTSC DOT pattern(408NPS or 5518/5418
equipment)
2-2. Preliminary steps
(1) Heat run over 45 minutes.
(2) Pre-adjust Raster slope, Raster position, Centering
Magnet & Lens focus.
(3) Check if the Magnet is located 45mm from the end of CRT.
(4) In case of using 801GF : Receive #13 DOT Pattern of
VGA mode(Format #5) through PC input terminal.
In case of using NTSC generator : Receive Dot signal
through the external input terminal.
2-3. 2-Pole Magnet Adjustment
(1) Make Green raster by covering Red and Blue.
(2) Check the center position of DOT pattern on the center of
the screen after turning Green focus volume left.
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ADJUSTMENT INSTRUCTIONS
Mechanical
Center
Green Light
Red/Blue Light
45mm
45mm