Sylvania Emerson 6719DC Service Manual page 25

2. Auto AFT (VCO) Adjustment
Purpose: To operate AFT correctly.
Symptom of Misadjustment: AFT does not work cor-
rectly and/or synchronization is faulty.
Test point
---
Tape
---
1. Set the unit to the Video mode with no signal input.
2. Enter the Service mode. (See page 1-8-1.) Then
press number "3" button on the 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.
Test point Adj. Point
CH. o / p
TP1001
buttons
Tape M. EQ.
Pattern Generator
---
DC Voltmeter
Note: TP1001--- Main CBA
1. Enter the Service mode. (See page 1-8-1.) Then
press number 2 button on the remote control unit.
2. Receive the Color Bar signal for channel 4
(67.25MHz). (RF Input Level: 60dBµV)
3. Press CH. o / p buttons so that the voltage of
TP1001 (AGC) becomes +2.8V±0.3V DC.
4. Turn the power off and on again.
Adj. Point Mode
--- Video
M. EQ. Spec.
---
Mode
Color Bar
--- 67.25MHz
Spec.
+2.8±0.3V DC
4-1. 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.
Input
Test point
-----
R583
---
Tape
---
Note: R583 --- H.V. CBA
1. Connect Frequency Counter to R583.
2. Operate the unit for at least 20 mintes.
3. Enter the Service mode. (See page 1-8-1.) Press
"2" button on the 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 remote control unit
so that the display will change "0" to "7."
5. At this moment, choose display "0" to "7" when the
Frequency
15.734kHz±300Hz.
6. Turn the power off and on again.
Input
60dBµV
1-8-2
Adj. Point Mode
CH o / p
Video
buttons
M. EQ.
Frequency Counter 15.734kHz±300Hz
counter display
Input
---
Spec.
is closest to
TD500EA