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3.2.4.6. Hall surround/monaural check
Adjustment procedure
Check that the following waveforms are obtained.
*Front: The phases of R and L are different.
The amplitudes are different.
*Rear: The phases of R and L are opposite.
The amplitudes of R and L are equal. ohserve the vertical
line to adjust
FRONT REAR
Note: Directly observe the screen by eye without using a mirror.
3.2.6. Horizontal AFC adjustment (R367)
Adjustment preparation
(1) Receive the reverse cross-hatch pattern signal. (Cross-
hatch lines are black.)
(2) Set CONTRAST to maximum BRIGHTNESS to center.
(3) Lens focus should be completed.
Note: The monaural check can be omitted. Amplitude levels of
(4) Electrical focus should be coarse adjusted.
front R and L are not even depending on the P.W.B. (5) The digital convergence RAM should be cleared (uncorrected
Center has no output. state). With the TV set off, press and hold the service switch
located on the front panel (see page 1 l), and then press the
3.2.4.7. Dolby surround check
power button. Use a small insulated tool to reach inside the
Adjustment procedure control panel to press the switch.
(1) Set to SURROUND: DOLBY (6) Raster inclination should be completed.
<heck that the following waveforms are obtained.
*Front: 4OOHz is superimposed on 5kHz. Adjustment procedure
*Rear: R and L are the same signal and 400Hz (1) Project only green color. Cover R & B lenses or short 2P
is superimposed on 5kHz. mini connectors on CPT P.W.B.?s.
FRONT REAR (2) Adjust H-size to minimum. R649 fully counterclockwise.
(3) Adjust green centering magnet (located on DY) to shift
picture left to display edge of raster.
L
(4) Adjust AFC (R367) so foldover of front porch occurs.
Amount of foldover is l/2 to 2/3 of front porch (t?,).
R
Note: MODE: PRO-LOGIC
CENTER: NORMAL
Set as above.
3.2.4.6. Dolby surround/monaural check
Adjustment procedure
Check that the following waveforms are obtained.
*Front: R and L waveforms are the same signal.
*Rear: (Almost no output from both R and L.)
FRONT REAR
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Note: (1) Front and back porch of video should be equal.
(2) If adjustment is difficult with test pattern,
follow adjustment 2.3.
Note: Front side check can be omitted. 3.3.DEFLECTION SYSTEM ADJUSTMENT
3.3.1. Raster inclination adjustment (Deflection yoke)
3.2.5. Shoot balance adjustment (Fl333) Adjustment preparation
Adjustment preparation (1) The set can face east or west.
(1) Receive the reverse cross-hatch pattern signal. (Cross- (2) Input the single cross test signal.
hatch lines are black.) (3) CONTRAST: MAX
(2) Set the video condition to factory reset. BRIGHTNESS: CENTER
(3) Turn the shoot balance adjustment VR (R333) fully counter- (4) The lens focus adjustment should have been completed.
clockwise.
(5) The electric focus should have been coarse adjusted.
(6) The digital convergence RAM should be cleared (uncorrected
Adjustment procedure
state). With the TV set off, press and hold the service switch
Gradually turn the shoot balance adjustment VR (R333) clockwise located on the front panel (see page 1 l), and then press the
and adjust so that the width of pre-shoot and over-shoot of the
power button. Use a small insulated tool to reach inside the
vertical line (black) shown in the circle pattern are balanced. control panel to press the switch.
(Visually adjust.)
(7) Start adjustment 20 minutes or more after TV is turned on.
Adjustment procedure
(1) Apply covers to the R and B lenses and project only
green light.
(2) Turn the G deflection yoke and adjust the vertical raster
inclination.
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ACEC
HITACHI
