5-1
L6250EA
ELECTRICAL ADJUSTMENT INSTRUCTIONS
General Note:
"CBA" is abbreviation for "Circuit Board Assem-
bly".
NOTE:
Electrical adjustments are required after replacing
circuit components and certain mechanical parts.
It is important to perform these adjustments only
after all repairs and replacements have been com-
pleted.
Also, do not attempt these adjustments unless the
proper equipment is available.
Test Equipment Required
1. NTSC Pattern Generator (Color Bar W/White
Window, Red Color, Dot Pattern, Gray Scale,
Monoscope, Multi-Burst)
2. DC Voltmeter
3. Oscilloscope: Dual-trace with 10:1 probe,
V-Range:0.001~50V/Div,
F-Range: DC~AC-60MHz
4. Plastic Tip Driver
5. Remote control unit: Part No. N0121UD or N0134UD
6. DC power supply 13.2V/5A
How to set up the service mode:
Service mode:
1.
Use the service remote control unit.
2.
Turn the power on. (Use main power on the TV
unit.)
3. Press " SLEEP " button on the service remote con-
trol unit. Version of micro computer will display on
the CRT. (Ex: 5Z38-919)
4.
Check the display on the lower left is "AE" and if it
is not "AE", set it at "AE" according to "3-1 LAN-
GUAGE, STEREO TYPE, ACCESS CODE, STA-
BLE SOUND, COMB FILTER, COMPONENT, AV
MEMORY".
1. +B Adjustment
Purpose:
To obtain correct operation.
Symptom of Misadjustment:
The picture is dark and
the unit does not operate correctly.
Note:
TP601, TP300(GND), VR661 --- Main CBA
1. Connect DC Volt Meter to TP601 and TP300(GND).
2. Adjust VR661 so that the voltage of TP601 becomes
+138±0.5V DC.
2-1. Setting for 7F, CHROMA, LAN-
GUAGE, STEREO TYPE, AC-
CESS CODE, STABLE SOUND,
COMB FILTER, COMPONENT
and AV MEMORY data Values
General
1. Enter the Service mode. (See page 5-1)
2. Press " VOL
p
" button on the Service remote con-
trol unit. Display changes " C/D ", " 7F ", " CHROMA
", " LANGUAGE ", " STEREO TYPE ", " ACCESS
CODE ", " STABLE SOUND ", " COMB FILTER ", "
COMPONENT " and " AV MEMORY " cyclically
when " VOL
p
" button is pressed.
7F
Press " CH
o
/
p
" buttons on the Service remote
control unit. Then choose " FF ".
CHROMA
Press " CH
o
/
p
" buttons on the Service remote
control unit. Then choose " AUTO ".
LANGUAGE
Press " CH
o
/
p
" buttons on the Service remote
control unit. Then choose " SPA ".
STEREO TYPE
Press " CH
o
/
p
" buttons on the Service remote
control unit. Then choose " MTS ".
ACCESS CODE
Press " CH
o
/
p
" buttons on the Service remote
control unit. Then choose " ON ".
STABLE SOUND
Press " CH
o
/
p
" buttons on the Service remote
control unit. Then choose " OFF ".
COMB FILTER
Press " CH
o
/
p
" buttons on the Service remote
control unit. Then choose " ON ".
COMPONENT
Press " CH
o
/
p
" buttons on the Service remote
control unit. Then choose " OFF ".
AV MEMORY
Press " CH
o
/
p
" buttons on the Service remote
control unit. Then choose " ON ".
Note:
C/D
data values do not need to be adjusted at
this moment.
Test Point
Adj. Point
Mode
Input
TP601(+B)
TP300(GND)
VR661
---
---
Tape
M. EQ.
Spec.
---
DC Voltmeter
+138±0.5V DC.
