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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 completed.
Also, do not attempt these adjustments unless
the proper equipment is available.
Test Equipment Required
1. DC Voltmeter
2. NTSC Pattern Generator (Color Bar W/White
Window, Red Color, Dot Pattern, Gray Scale,
Monoscope, Multi-Burst)
3. Remote control unit: Part No. NE240UD
4. Color Analyzer
How to make Service remote
control unit:
1. Prepare normal remote control unit (Part No.
NE240UD). Remove 3 screws from the back lid
(Fig. 1-1).
Screws
Remote control unit (bottom)
2. Cut off pin 10 of the remote control
microprocessor and short circuit pins 10 and 17 of
the microprocessor 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. (Use main power on the TV
unit.)
3. Press [DISC MENU] button on the service remote
control unit. Version of micro computer will be
displayed on the LCD or display. (Ex: A94FP-0.13)
1. Initial Setting
General: Enter the Service mode. (See page 6-1.)
Set the each initial data as shown on table 1 below.
Table 1: Initial Data
Item
BRT
CNT
CLR-R
CLR-B
TNT
V-TNT
SHR
Fig. 1-1
S-BRT
S-CNT
S-CLR-R
S-CLR-B
S-TNT
S-SHR
C-BRT
C-CNT
C-CLR-R
C-CLR-B
C-TNT
C-SHR
6-1
Button
[Use the attached
remote control unit.
Value
(not service remote
control unit)]
[MENU] → [1]
[MENU] → [2]
[MENU] → [3]
L2550EA
Data
128
124
64
64
128
128
112
128
128
64
64
128
112
128
128
74
74
128
112
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