Electrical Adjustment Instructions - Emerson EWT19S2 Service Manual

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 make Service remote control unit:
1. Prepare normal remote control unit. (Part No. N0121UD
or N0134UD) Remove 3 Screws from the back lid.
(Fig. 1-1)
2. Add J1 (Jumper Wire) to the remote control CBA.
(Fig. 1-2)
SCREWS
REMOTE CONTROL UNIT
REMOTE CONTROL CBA
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: 200-0.07 or 054-0.13)
4. Then CPU version is 054-0.13: Check the display
on the lower left is "00" and if it is not "00," set it at
"00" according to "3-1 FRENCH, ACCESS CODE,
VIDEO TONE."
When CPU version is 200-0.07: Confirm that the
character of U ( U.S.A. model ) is indicated on the
bottom left of the CRT. If the character of C ( CAN-
ADA model ) is indicated, perform "3-1 Setting for
FRENCH Data Values."
1. DC 114V Adjustment
Purpose: To obtain correct operation.
Symptom of Misadjustment: The picture is dark and
the unit does not operate correctly.
Test Point
TP601
TP300
(GND)
Tape
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.
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 5-1)
2. Press "6" button on the Service remote control
unit. "B-S" is indicated.
Fig. 1-1
3. Press "CH o / p" buttons on the Service remote
control 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. "B-S*2" is indicated.
5. Press "CH o / p" buttons on the Service remote
Fig. 1-2
control unit so that display will change " 0," "1." "2"
and "3." Then choose "B-S*2 0."
6. Turn the power off and on again, using the main
power button on the TV unit.
5-1
Adj. Point
VR661
M. EQ.
--- DC Voltmeter
Mode Input
--- ---
Spec.
+114±0.5V DC.
L6118EA