Magnavox 19MDTR20 Service Manual page 15

2. H Adjustment
Purpose: To get correct horizontal position and size of
screen image.
Symptom of Misadjustment: Horizontal position and
size of screen image may not be properly displayed.
Test Point Adj. Point
R583 CH o / p buttons
M. EQ.
Frequency Counter
Note: R583 --- H.V. CBA
1. Connect frequency counter to R583.
2. Operate the unit for at least 20 minutes.
3. Enter the Service mode. (See page 1-4-1.) Press
"2" button on the service remote control unit and
select H-ADJ mode.
4. Press "CH o / p" buttons on the service remote
control unit so that the display will change "0" to
"7." At this moment, choose display "0" to "7" when
the frequency counter display is closest to
15.734kHz±300Hz.
5. Turn the power off and on again.
3. C-Trap Adjustment
Purpose: To get minimum leakage of the color signal
carrier.
Symptom of Misadjustment: If C-Trap Adjustment is
incorrect, stripes will appear on the screen.
Test Point Adj. Point
D1304
CH o / p
(Cathode)
buttons
(B-OUT)
M. EQ.
Oscilloscope,
Pattern Generator
Figure
minimum
Note: D1304 (Cathode) (B-Out)--- Main CBA
Mode
Video
Spec.
15.734kHz±300Hz
Input
Color Bar
Fig. 2
1-4-2
1. Connect Oscilloscope to D1304 (Cathode).
2. Input a color bar signal from RF input.
Enter the Service mode. (See page 1-4-1.)
3. Press "0" button on the service remote control unit
and select C-TRAP Mode.
4. Press CH o / p buttons on the service remote
control unit so that the carrier leakage B-Out
(3.58MHz) value becomes minimum on the oscillo-
scope.
5. Turn the power off and on again.
4. V. Size Adjustment
Purpose: To obtain correct vertical height of screen
image.
Symptom of Misadjustment: If V. Size is incorrect,
vertical height of image on the screen may not be
properly displayed.
Adj. Point
CH o / p buttons
M. EQ.
Pattern Generator
1. Enter the Service mode. (See page 1-4-1.)
Press "9" button on the service remote control unit
and select V-S mode. (Press "9" button then dis-
play will change to V-P and V-S).
2. Input monoscope pattern.
3. Press "CH o / p" buttons on the service remote
control unit so that the monoscope pattern is
90±5% of display size and the circle is round.
Input
Monoscope
Spec.
90±5%
TD857EA