1-7-2
T4300EA
1b. DC 117V (+B) Adjustment
(DC Power)
Purpose:
To obtain correct operation.
Symptom of Misadjustment:
The picture is dark and
unit does not operate correctly.
Note:
J1015(+B), J1027(GND), VR1951 --- HV/DC
Power Supply CBA
1. Input 13.2V DC to DC Jack.
2. Connect DC Volt Meter to J1015(+B) and
J1027(GND).
3. Adjust VR1951 so that the voltage of J1015(+B)
b117
±
0.5V DC.
2. Auto AFT (VCO) Adjustment
Purpose:
To operate AFT correctly.
Symptom of Misadjustment:
AFT does not work cor-
rectly and/or synchronization is faulty.
1. Set the unit to the Video mode with no signal input.
2. Enter the Service mode. (See page 1-4-1.) 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).
3-1. 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.
Note:
TP001 (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. Press CH.
o
/
p
buttons so that the voltage of
TP001 (AGC) b2.8V
±
0.3V DC.
4. Turn the power off and on again.
3-2. FM AGC Adjustment
(SSC092 only)
1. Enter the Service mode. (See page 1-4-1.) Then
press number "2" button twice on the remote con-
trol unit.
2. Press CH.
o
/
p
buttons so that the FM AGC level
is 127.
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.
Note:
D302 CATHODE --- Main CBA
1. Connect Frequency Counter to D302 CATHODE.
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.
Test point
Adj. Point
Mode
Input
J1015
(+B)
J1027
(GND)
VR1951
---
-----
Tape
M. EQ.
Spec.
---
DC Voltmeter
Plastic Tip Driver
+117
±
0.5V DC
Test point
Adj. Point
Mode
Input
---
---
Video
-----
Tape
M. EQ.
Spec.
---
---
---
Test point
Adj. Point
Mode
Input
TP001
(AGC)
TP602
(GND)
CH.
o
/
p
buttons
---
Color Bar
67.25MHz
60dB
µ
V
Tape
M. EQ.
Spec.
---
Pattern Generator
DC Voltmeter
+2.8
±
0.3V DC
Test point
Adj. Point
Mode
Input
D302
CATHODE
CH
o
/
p
buttons
Video
---
Tape
M. EQ.
Spec.
---
Frequency Counter
15.734kHz
±
300Hz
