5-3
L6200EA
5. VCO Adjustment
Purpose:
To operate VCO correctly.
Symptom of Misadjustment:
VCO does not work
correctly and/or synchronization is faulty.
Note:
Use service remote control unit.
1. Disconnect the RF input and set the unit to Channel 4.
2. Enter the Service mode. (See Page 5-1)
3. Press " 3 " button on the Service remote control
unit. The Auto VCO adjustment is started.
4. If the display color is changed from red to green,
This adjustment is done.
5. Turn the Power off and on again. (Main power but-
ton on the TV unit.)
6. 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.
Notes:
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.
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 b2.5±0.1V DC. If the tuner is
used TEDH9-309A. (Tuner type number)
4. Press " CH
o
/
p
" buttons so that the voltage of
TP301 b2.8±0.1V DC. If the tuner is
used B8095AD. (Tuner type number)
5. Press " CH
o
/
p
" buttons so that the voltage of
TP301 b2.7±0.1V DC. If the tuner is
used ENV56DB3G3. (Tuner type number)
6. Turn the Power off and on again. (Main power but-
ton on the TV unit.)
7. Black Level Adjustment
Purpose:
Set Black Level
Symptom of Misadjustment:
If black level is incor-
rect, Proper brightness can not be obtained by adjust-
ing the Brightness Control.
1. Enter the Service mode. (See page 5-1).
2. Press " MENU " button on the Service remote con-
trol unit and select " BRT "mode. (Display changes
" BRT ", " CNT ", " CLR " and " TNT "cyclically
when MENU button is pressed).
3. Press " CH
o
/
p
" buttons on the Service remote
control unit so that the value of " BRT " becomes
128.
4. Turn the power off and on again. (Main power but-
ton on the TV unit.)
8. C-Trap Adjustment
Purpose:
To get minimum leakage of the color signal carrier.
Symptom of Misadjustment:
If C- Trap Adjustment
is incorrect, stripes will appears on the screen.
Note:
TP1501, TP1502 --- CRT CBA
Use Service remote control unit.
1. Connect Oscilloscope to TP1502 and TP1501
(GND).
2. Enter the Service mode. (See Page 5-1) Receive
color bar signal from RF Input.
3. Press " 0 " button on the Service remote control
unit and select C-TRP Mode.
4. Press " CH
o
/
p
" buttons on the Service remote
control unit so that the display will change " 0 ", " 1
", " 2 " and " 3 ". Choose display " 0 ", " 1 ", " 2 " or
" 3 " when B-Out (3.58MHz) value becomes mini-
mum on the oscilloscope reading.
5. Turn the power off and on again. (Main power but-
ton on the TV unit.)
Test Point
Adj. Point
Mode
Input
---
---
No signal
Tape
M. EQ.
Spec.
---
---
---
Test Point
Adj. Point
Mode
Input
TP301
CH
o
/
p
buttons
RF
Color Bar
67.25MHz
60dBµV
Tape
M. EQ.
Spec.
---
Pattern
Generator DC
Volt Meter
+2.5±0.1VDC or
+2.8±0.1VDC or
+2.7±0.1VDC
by Tuner Type.
Test Point
Adj. Point
Mode
Input
TP1502(Blue)
TP1501
(GND)
CH
o
/
p
buttons
RF
Color
Bar
Tape
M. EQ.
Spec.
---
Oscilloscope
---
