Memorex MT-1132, Руководство по обслуживанию

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FIG. 5
FOCUS ADJUSTMENT
Adjust focus control, located on the Horizontal Output Transformer (T671), for maximum overall definition
and fine picture detail with Brightness and Contrast controls set at normal viewing levels.
BLACK AND WHITE ADJUSTMENT ( CUTOFF / WHITE BALANCE )
The purpose of this procedure is to adjust the bias applied to the color picture tube for reproducing a
quality monochrome picture at all brightness levels and also to achieve maximum usable brightness.
Confirm that proper purity and AGC adjustments have been completed before starting this adjustment.
1. Connect the TV test pattern generator ( Monoscope pattern ) to the EXT. antenna terminal via TV
VHF/UHF signal generator ( NTSC signal, 70dB u ).
2. Select Cutoff Mode by remote control, ( refer to page 4 for remote control key combination and
position.) and CUT OFF will be displayed on top-right screen for about 3 seconds. At the same time
the data readings for Cutoff and Gain in Adjustment Mode (2) will become as follows :
R CUTOFF : 50, G CUTOFF : 50, B CUTOFF : 50 , G GAIN : 127, B GAIN : 127
3. Select Service Mode by remote control,
( refer to page 4 for remote control key combination and
position.) and TV screen becomes horizontal line.
4. Turn the Screen control ( located under the flyback transformer ) clockwise until any blue, green or
red color line appears.
5. Check the color of the line which appeared first, then turn the Screen control ( located under the
flyback transformer ) fully counterclockwise.
6. Adjust the cutoff level of the color which appeared first by remote control, ( refer to page 4 for
remote control key combination and position.) so that voltage between TP16 and TP15 (blue), TP14
(green) or TP13 (red) is 20
!
1V.
7. Turn the Screen control (located under the flyback transformer) clockwise so that the bright color line
can just be seen.
8. Adjust cutoff levels other than the above by remote control, ( refer to page 4 for remote control key
combination and position.) so that the line color is white.
9. Press again Service Mode key by remote control, ( refer to page 4 for remote control key
combination and position.) to return to TV position. Monoscope pattern will appear on TV screen.
10. Adjust the contrast and brightness controls to make the picture dim. Adjust the Green and Blue
Cutoff levels by remote control, ( refer to page 4 for remote control key combination and position.)
so that the picture is white.
11. Adjust the contrast and brightness controls to make the picture bright. Adjust the Green and Blue
Gain levels by remote control, ( refer to page 4 for remote control key combination and position.) so
that the picture is white.
12. Repeat steps 10 and 11 so that the picture is white in both dim and bright conditions.
HORIZONTAL PHASE ADJUSTMENT
1. Connect TV Test pattern Generator (NTSC signal 70dB u, Monoscope Pattern) to EXT. Antenna
Terminal (TE1) through TV Channel Generator.
( NOTE: For steps 2, 3 and 4 below, refer to page 3 for Adjustment By Remote Control Method).
2. Go to Adjustment Mode (2) by remote control.
3. Select H. PHASE from Adjustment Mode (2) menu screen.
4. Adjust H. PHASE level ( by using + or - button on remote control ) so that horizontal reading of test
pattern becomes the same value.
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