Sylvania SSC132 Service Manual page 23

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
J191 CH. o / p
(AGC) buttons
Tape M. EQ.
Pattern Generator
---
DC Voltmeter
Note: J191 (AGC) --- Main CBA
1. Enter the Service mode. (See page 1-4-1.) 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
J191 (AGC) becomes +2.8V±0.3V DC.
4. Turn the power off and on again.
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.
Test point Adj. Point
CH o / p
R583
buttons
Tape M. EQ.
--- Frequency Counter 15.734kHz±300Hz
Note: R583 --- Main CBA
1. Connect Frequency Counter to R583.
2. Set the unit to the VIDEO mode and no input is
necessary. Enter the Service mode.
(See page 1-4-1.)
3. Operate the unit for at least 20 minutes.
4. Press "2" button on the remote control unit and
select H-Adj Mode. (Press "2" button, then display
will change H-Adj and AGC.)
5. Press CH o / p buttons on the remote control unit
so that the display will change "0" to "7."
At this moment, choose display "0" to "7" when the
Frequency counter
15.734kHz±300Hz.
6. Turn the power off and on again.
Mode Input
Color Bar
--- 67.25MHz
60dBµV
Spec.
+2.8±0.3V DC
Mode Input
Video ---
Spec.
display is closest to
4-2. 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
J233 CH o / p
(B-OUT) buttons
Tape M. EQ.
Oscilloscope
---
Pattern Generator
minimum
Note: J233 (B-Out)--- Main CBA
1. Connect Oscilloscope to J233.
2. Input a color bar signal from RF input.
Enter the Service mode. (See page 1-4-1.)
3. Press "0" button on the remote control unit and
select C-TRAP Mode.
4. Press CH o / p buttons on the remote control unit
so that the carrier leakage B-Out (3.58MHz) value
becomes minimum on the oscilloscope.
5. Turn the power off and on again.
1-7-2
Mode Input
--- Color Bar
Spec.
---
Figure
Fig. 2
T5300EA