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.NTSC Pattern Generator (Color Bar W/White Window, Red Color, Dot Pattern, Gray Scale, Monoscope,
2.AC Milli Voltmeter (RMS)
3.Alignment Tape (FL8A, FL8N), Blank Tape
4.DC Voltmeter
5.Oscilloscope:
6.Frequency Counter
7.Plastic Tip Driver
8.Color Analyzer
How to make service remote control unit:
1.Prepare normal remote control unit (Part No. NE204UD or NE209UD). Remove 4 screws from the back lid (Fig. 1).
Screws
Remote control unit (bottom) | Fig. 1 |
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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 enter 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.To enter the TV mode, press [CH. o / p] buttons on the TV unit.
4.Press [DISC MENU] button on the service remote control unit. Version of micro computer will display on the CRT. (Ex:
X-Ray Protection Test
1.Short both ends of R2592 (on Sub CBA).
2.Confirm that the main power turns off.
3.If the main power does not turn off, then replace the following parts (D2591, Q2591, R2592, R2593, R2594 and IC1201).
4.Perform steps 1 to 3 again.
1. DC 120V (+B) Adjustment
Purpose: To obtain correct operation.
Symptom of Misadjustment: The picture is dark and unit does not operate correctly.
Test Point | Adj. Point | Mode | Input | |
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TP2501(+B) | VR1601 | |||
TP2504(GND) | ||||
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Tape | M. EQ. |
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DC Voltmeter | +120±1.0 V DC | |||
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Note: TP2501(+B), TP2504(GND)
1.Connect the unit to AC Power Outlet.
2.Connect DC Volt Meter to TP2501(+B) and TP2504(GND).
3.Adjust VR1601 so that the voltage of TP2501(+B) becomes +120±1.0 V DC.
T2202EA |
