Sylvania SRT2232S Service Manual page 16

4. AGC Adjustment
Purpose: Set AGC (Auto Gain Control) Level.
Symptom of Misadjustment: AGC does not syn-
chronize correctly when RF input level is too weak and
picture distortion may occur if it is too strong.
Test Point Adj. Point
TP301
(AGC) CH o / p
TP300 buttons
(GND)
Tape M. EQ.
Pattern
--- Generator DC
Volt Meter
Notes: TP300, TP301 --- Main CBA
Use Service remote control unit.
1. Enter the Service mode. (See Page 5-1) Then
press number " 2 " button on the Service remote
control unit and select TV AGC.
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
TP301 becomes +2.5±0.1V DC. If the tuner is
used TEDH9-300A. (Tuner type number)
4. Turn the Power off and on again. (Main power but-
ton on the TV unit.)
5. V. Size Adjustment
Purpose: To obtain correct vertical width of screen image.
Symptom of Misadjustment: If V. Size is incorrect, verti-
cal size of image on the screen may not be properly dis-
played.
Test Point Adj. Point
Screen Control
CH o / p
---
buttons [ V-S ]
Mode
Tape M. EQ.
--- Monoscope
Note: Use service remote control unit.
1. Operate the unit for at least 20 minutes.
2. Enter the Service mode. (See page 5-1)
3. Receive the Monoscope Pattern.
4. Press " 9 " button on the Service remote control unit
and select " V-S " mode. (Display changes " V-S ",
" V-P ", " V-LI " and " V-SC " cyclically when " 9 " but-
ton is pressed).
5. Press " CH o / p " buttons on the Service remote
control unit so that the monoscope pattern will be
90±5% of display size and the circle is round.
Mode Input
Color Bar
RF 67.25MHz
60dBµV
Spec.
+2.5±0.1VDC
Mode Input
Mono-
RF
scope
Spec.
90±5%
6. Turn the power off and on again. (Main power but-
ton on the TV unit.)
6. V. Position Adjustment
Purpose: To obtain correct vertical width of screen
image.
Symptom of misadjustment: If V. Position is incor-
rect, vertical height of image on the screen may not be
properly displayed.
Test Point
Screen Control
---
buttons [ V-P ]
Tape
---
Note: Use Service remote control unit
1. Operate the unit for at least 20 minutes.
2. Enter the Service Mode. (See page 5-1)
3. Receive the Monoscope Pattern.
4. Press " 9 " button on the Service remote control unit
and select " V-P "mode. (Display change " V-S ", "
V-P ", " V-LI " and " V-SC " cyclically when " 9 " but-
ton is pressed).
5. Press " CH o / p " buttons on the Service remote
control unit so that the top and bottom of the mono-
scope pattern will be equal of each other.
6. Turn the Power off and on again. (Main power but-
ton on the TV unit.)
7. H. Position Adjustment
Purpose: To obtain correct horizontal position of
screen image.
Symptom of Misadjustment: If H. Position is incor-
rect, horizontal position of image on the screen may
not be properly displayed.
Test Point
Screen Control
---
buttons [ H-P ]
Tape
---
Note: Use Service remote control unit
1. Operate the unit for at least 20 minutes.
2. Enter the Service mode. (See page 5-1)
3. Receive the Monoscope Pattern.
4. Press " 8 " button on the remote control unit and
select " H-P "mode.
5-3
Adj. Point Mode
CH o / p
RF
Mode
M. EQ.
Monoscope
Adj. Point Mode
CH o / p
RF
Mode
M. EQ.
Monoscope
Input
Mono-
scope
Spec.
90±5%
Input
Mono-
scope
Spec.
90±5%
L6250EA