Sylvania 6319CCB, Service Manual, Page: 23 / 108

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
picture distortion may occur if it is too strong.
Test Point Adjustment Point Mode Input
AGC CH.
▲
/
▼
buttons ---
Color Bar
67.25MHz
60dB
µ
V
Tape M. EQ. Spec.
---
Pattern Generator
DC Volt Meter
+2.8V
±
0.3VDC
Notes: 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: 60dB
µ
V)
3-1. Press CH.
▲
/
▼
buttons so that the voltage of AGC
b2.8V
±
0.3V DC.
(Tuner Type No. TEDH9-300A)
3-2. Press CH.
▲
/
▼
buttons so that the voltage of AGC
b2.8V
±
0.3V DC.
(Tuner Type No. B8055AR)
3-3. Press CH.
▲
/
▼
buttons so that the voltage of AGC
b2.8V
±
0.3V DC.
(Tuner Type No. B8095AP)
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 Adjustment Point Mode Input
D302
CATHODE
CH
▲
/
▼
buttons VIDEO ----
Tape M. EQ. Spec.
----
Frequency
Counter
15.734kHz
±
300Hz
Note: D302 CATHODE --- Main CBA
1. Connect Frequency Counter to INT. MONITOR.
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
▲
/
▼
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 display is closest to
15.734kHz
±
300Hz.
6. Turn the power off and on again.
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 Adjustment Point Mode Input
J070
(B-Out)
CH
▲
/
▼
buttons --- Color Bar
Tape M. EQ. Spec.
---- Oscilloscope 200mV P-P
Note: J070 (B-Out)--- Main CBA
1. Connect Oscilloscope to J070.
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
▲
/
▼
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.
minimum
Fig. 2
1-7-2 T7200EA