5-1
L6406EA
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. N0158UD or
NE127UD
6. DC power supply 13.2V/5A
7. Color Analyzer
How to make service remote control
unit:
1. Prepare normal remote control unit. (Part No.
N0158UD or NE127UD) Remove 3 Screws from
the back lid. (Fig. 1-1)
2. Add J1 (Jumper Wire) to the remote control CBA.
(Fig. 1-2)
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: 050-0.11)
4. When CPU version is 050-0.11: Check the display
on the lower left is "04" and if it is not "04," set it at
"04" according to "3-1 7F, FRENCH, ACCESS
CODE, STEREO, VIDEO TONE, FM-MODE, V-
OUT."
1. DC 114V 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
+114±0.5V DC.
SCREW
REMOTE CONTROL UNIT
Fig. 1-1
J 1
Fig. 1-2
REMOTE CONTROL CBA
Test Point
Adj. Point
Mode
Input
TP601
TP300 (GND)
VR661
---
---
Tape
M. EQ.
Spec.
---
DC Voltmeter
+114±0.5V DC.
