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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. N0138UD or N0139UD
6. DC power supply 13.2V/5A
How to make Service remote control unit:
1. Prepare normal remote control unit. (Part No.
N0138UD or N0139UD) Remove 3 Screws from
the back lid. (Fig. 1-1)
2. Added 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: 057-0.02)
4. Check the display on the lower left is "2801" and if
it is not "2801," set it at "2801" according to "2. Ini-
tial Setting."
1. +B Adjustment
Purpose: To obtain correct operation.
Symptom of Misadjustment: The picture is dark and
the unit does not operate correctly.
Test Point
TP601(+B)
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
+112±0.5V DC.
Fig. 1-1
Fig. 1-2
5-1
Adj. Point
Mode
VR661
---
M. EQ.
Spec.
DC Voltmeter
+112±0.5V DC.
Input
---
L6509EA
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