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ELECTRICAL ADJUSTMENT INSTRUCTIONS
General Note:
"CBA" is abbreviation for "Circuit Board
Assembly."
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 Win-
dow, Red Color, Dot Pattern, Gray Scale, Mono-
scope, Multi-Burst)
2. AC Milli Voltmeter (RMS)
3. DC Voltmeter
4. Oscilloscope: Dual-trace with 10:1 probe,
V-Range: 0.001~50V/Div,
F-Range: DC~AC-60MHz
5. Frequency Counter
6. Plastic Tip Driver
How to make service remote control
unit:
1. Prepare remote control unit. (Part No. NE200UD or
NE207UD) Remove 4 screws from the back lid.
(Fig. 1-1)
SCREW
Remote control unit (Bottom)
2. Remote control unit: Part No. NE200UD or
NE207UD
Cut off pin 10 of the remote control microprocessor
and short circuit pins 10 and 17 of the microproces-
sor with a jumper wire.
How to Set up the Service mode:
Service Mode:
1. Use the service remote control unit.
2. Turn the power on.
3. Press "DISC MENU" button on the service remote
control unit.
1. DC 114V (+B) Adjustment
Purpose: To obtain correct operation.
Symptom of Misadjustment: The picture is dark and
unit does not operate correctly.
Test point
J2023 (+B)
TP1303 (GND)
Tape
---
Note:
J2023 (+B), TP1303 (GND), VR1601 --- Main CBA
1. Connect the unit to AC Power Outlet.
2. Connect DC Volt Meter to J2023 (+B) and TP1303
(GND).
3. Adjust VR1601 so that the voltage of J2023 (+B)
becomes +114±0.5V DC.
2. Black Stretch Control Adjustment
Purpose: To show the fine black color.
Symptom of Misadjustment: Black color will not
appear correctly.
Note: Use service remote control unit.
1. Enter the Service mode. (See page 1-7-1)
Fig. 1-1
2. Press "6" button on the service remote control unit.
"B-S" is indicated.
3. Press "CH o / p" buttons on the service remote con-
trol unit so that display will change "OFF," "0," "1," "2"
and "3." Then choose "B-S OFF."
4. Press "6" button on the service remote control unit.
"BS-2" is indicated.
5. Press "CH o / p" buttons on the service remote
control unit so that display will change "0" and "1."
Then choose "BS-2 0."
6. Turn the power off and on again, using the main
power button on the TV unit.
1-7-1
Adj. Point
Mode
VR1601
---
M. EQ.
Spec.
DC Voltmeter
+114±0.5V DC
Plastic Tip Driver
Input
-----
TD808EA
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