Magnavox 27MDTR10S, Руководство по обслуживанию

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1-9-2 TD603EA
2. Auto AFT (VCO) Adjustment
Purpose: To operate AFT correctly.
Symptom of Misadjustment: AFT does not work cor-
rectly and/or synchronization is faulty.
1. Set the unit to the Video mode with no signal input.
2. Enter the Service Mode. (See page 1-9-1.) Then
press number "3" button on the service remote
control unit.
3. If the screen color changes to "Green" then this
adjustment is finished.
4. If the screen color changes to "Red" then this
adjustment is failed. Repeat steps 1 and 2 or check
relative circuit or parts (IC).
3. TV AGC Adjustment
Purpose: Set AGC (Auto Gain Control) Level.
Symptom of Misadjustment: AGC does not synchro-
nize correctly when RF input level is too weak and pic-
ture distortion may occur if it is too strong.
Note: TP1001--- Main CBA
1. Enter the Service Mode. (See page 1-9-1.) Then
press "2" button on the service remote control unit
and select AGC mode.
2. Receive the Color Bar signal for channel 4
(67.25MHz). (RF Input Level: 60dB
µ
V)
3. Press "CH
o
/
p
" buttons so that the voltage of
TP1001 (AGC) b2.8V
±
0.3V DC.
4. Turn the power off and on again.
4. 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.
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 1-9-1.) Press
"2" button on the service remote control unit and
select H-ADJ Mode. (Press "2" button then display
will change H-ADJ and AGC.)
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.
5. 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.
1. Enter the Service Mode. (See page 1-9-1.)
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.
Test Point Adj. Point Input
TP1001
(AGC)
CH
o
/
p
buttons
Color Bar 67.25MHz
60dB
µ
V
M. EQ. Spec.
Pattern Generator
DC Voltmeter
+2.8
±
0.3V DC
Test Point Adj. Point Mode
R583 CH
o
/
p
buttons Video
M. EQ. Spec.
Frequency Counter 15.734kHz
±
300Hz
Adj. Point Input
CH
o
/
p
buttons Monoscope
M. EQ. Spec.
Pattern Generator 90
±
5%