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NEC AS120-1 User Manual

NEC AS120-1
31 pages
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COLOR MONITOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS NO. : CA-134
FACTORY MODEL: AS120J
MODEL: AS120-1, AS120-BK-1
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NEC AS120-1 Specifications

General IconGeneral
BrandNEC
ModelAS120-1
CategoryMonitor
LanguageEnglish

Summary

SAFETY PRECAUTIONS

Safety Warnings and Hazards

Critical component warnings, safety checks, fire/shock risks, and X-radiation prevention.

TIMING CHART

WIRING DIAGRAM

BLOCK DIAGRAM

DESCRIPTION OF BLOCK DIAGRAM

Power, Signal, and Control Circuits

Explains SMPS, Micom, Sync Processor, and Deflection Output circuits.

High Voltage and Video Circuits

Details High Voltage, Linearity, OSD, and Video Amplifier circuits.

ADJUSTMENT PROCEDURES

Voltage and Raster Adjustments

Procedures for setting B+ voltage, high voltage, and horizontal raster center.

White Balance, Luminance, and Focus

Calibration of color balance, luminance, and focus for optimal picture quality.

TROUBLESHOOTING GUIDE

Power and Display Issues

Troubleshooting steps for no power, no character, and no raster conditions.

Deflection and DPM Problems

Diagnosing vertical deflection failures and DPMS mode issues.

Degaussing and Other Faults

Steps for addressing degaussing failures and other common troubleshooting scenarios.

OPERATING INSTRUCTIONS

Front Panel Controls

Explanation of the power button, indicator light, and OSD adjustment buttons.

EXPLODED VIEW

REPLACEMENT PARTS LIST

Main Board Capacitors

List of capacitors on the main board with specifications.

Diodes

Replacement diodes with part numbers and specifications.

Integrated Circuits (ICs)

List of integrated circuits with part numbers and functions.

Resistors

List of resistors with values and specifications.

PIN CONFIGURATION

M24C08 EEPROM Pinout

Pin configuration and functions for the M24C08 serial EEPROM.

M62501P/FP IC Pinout

Pin configuration and terminal functions for the M62501P/FP IC.

TDA4867J IC Details

TDA4867J Pin Configuration

Pinout and functional description of the TDA4867J IC.

TDA4867J Block Diagram

Functional block diagram illustrating the TDA4867J IC's operation.

TDA4841PS IC Details

TDA4841PS Pin Configuration

Pinout and functional description of the TDA4841PS IC.

TDA4841PS Block Diagram

Functional block diagram illustrating the TDA4841PS IC's operation.

SCHEMATIC DIAGRAM

PRINTED CIRCUIT BOARD LAYOUTS

Control Board Views

Component and solder side views of the control board.

Main Board Views

Component and solder side views of the main board.

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