Emerson 6420FE service manual Sub-Brightness Adjustment, Focus Adjustment, Purity Adjustment

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14. Sub-Brightness Adjustment

Purpose: To get proper brightness.

Symptom of Misadjustment: If Sub-Brightness is incorrect, proper brightness cannot be obtained by adjusting the Brightness Control.

 

Test Point

Adj. Point

Mode

 

Input

 

 

 

 

 

 

---

CH o / p

RF

 

IQW

buttons

 

 

 

 

 

 

 

 

 

 

 

 

 

Tape

M. EQ.

 

Spec.

 

 

 

 

 

 

---

Pattern

See below

Generator

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure

 

 

 

White

Black

 

 

This bar

 

just

 

visible

 

Fig. 4

Note: IQW Setup level --- 7.5 IRE

Use service remote control unit

1.Enter the Service mode. (See page 5-1) Then input IQW signal from RF Input.

2.Press "MENU" button on the service remote control unit and Select "BRT" mode. (Display changes "BRT," "CNT," "CLR," "S-CLR," "TNT," "V-TNT," "S- TNT," "SHARP," and "S-SRP," cyclically when "MENU" button is pressed). Press "CH o/p" buttons so that the bar is just visible (See above figure).

3.Turn the power off and on again. (Main power but- ton on the TV unit.)

15. Focus Adjustment

Purpose: Set the optimum Focus.

Symptom of Misadjustment: If Focus Adjustment is incorrect, blurred images are shown on the display.

Test Point

Adj. Point

Mode

Input

 

 

 

 

 

 

 

 

---

Focus Control

---

Mono-

scope

 

 

 

 

 

 

 

Tape

M. EQ.

Spec.

 

 

 

---

Pattern

See below

Generator

 

 

Note: Focus VR (FBT) - Main CBA,

FBT=Fly Back Transformer

1.Operate the unit more than 30 minutes.

2.Face the unit to the East and Degauss the CRT using Degaussing Coil.

3.Input the Monoscope Pattern.

4.Adjust the Focus Control on the FBT to obtain clear picture.

The following adjustments normally are not attempted in the field. Only when replacing the CRT then adjust as a preparation.

16. Purity Adjustment

Purpose: To obtain pure color.

Symptom of Misadjustment: If Color Purity Adjust- ment is incorrect, large areas of color may not be properly displayed.

Test Point

Adj. Point

Mode

 

Input

 

 

 

 

 

 

 

Deflection

 

 

Red

---

Yoke Purity

---

 

 

Color

 

Magnet

 

 

 

 

 

 

 

 

 

 

 

 

 

Tape

M. EQ.

 

Spec.

 

 

 

 

 

 

 

 

 

 

 

 

---

Pattern

See below.

Generator

 

 

 

 

 

 

 

 

 

 

 

 

Figure

 

 

 

 

GREEN

RED

BLUE

Fig. 5

1.Set the unit facing east.

2.Operate the unit for over 30 minutes before adjust- ing.

3.Fully degauss the unit using an external degauss- ing coil.

4.Loosen the screw on the Deflection Yoke Clamper and pull the Deflection Yoke back away from the screen. (See Fig. 6)

5.Loosen the Ring Lock and adjust the Purity Mag- nets so that a red field is obtained at the center of the screen. Tighten Ring Lock. (See Fig. 5,6)

6.Slowly push the Deflection Yoke toward bell of CRT and set it where a uniform red field is ob- tained.

7.Tighten the clamp screw on the Deflection Yoke.

5-6

L2401EA

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Contents 6420FE EWF2004 Important Safety Notice Table of ContentsSpecifications Description Condition Unit Nominal LimitDBµv DBµv AFT Pull In Range 10mV input MHz ±2.0 ±0.7Important Safety Precautions Safety Precautions for TV CircuitNot be Above 0.5 mA L6115IMPL6115IMP Precautions during Servicing Leakage Current Test Safety Check after ServicingClearance Distance How to Remove / Install Flat Pack-IC Standard Notes for ServicingCircuit Board Indications Pb Lead Free SolderWith Iron Wire MachineMasking Flat Pack-IC Tape Tweezers With Soldering IronPresolder InstallationPin 1 of the Flat Pack-IC Is indicated by a mark Instructions for Handling Semiconductors Ground for Human BodyGround for Workbench IncorrectCabinet Disassembly Instructions Disassembly FlowchartDisassembly Method Reference Notes in the TableCRT Rear CabinetRear Cabinet Main CBA TV Cable Wiring Diagram Electrical Adjustment Instructions How to set up the service mode+B Adjustment Service modeInitial Setting GeneralF0 Adjustment Black Stretch Control AdjustmentSD Check Mode Purity CheckPosition Adjustment Size Adjustment10. V. Position Adjustment Software ResetCut-off Adjustment White Balance AdjustmentMode Input Tape SpecPurity Adjustment Sub-Brightness AdjustmentFocus Adjustment Convergence Adjustment FiguresBlock SystemIF/Video Block Diagram L2401BLIFAudio L2401BLABlock Diagram CRT/H.VDiagram L2401BLPTolerance of Capacitors are noted with the following Schematic Diagrams / Cbas and Test PointsStandard Notes Wire Connectors How to read converged linesIs not consistent here Test Point InformationMain 1/4 Schematic Diagram L2401SCM1Main 2/4 Schematic Diagram L2401SCM2Main 3/4 Schematic Diagram L2401SCM3Main 4/4 & CRT Schematic Diagram Main 4/4 Ref No PositionMain CBA Top View BL2700F01012-1Main CBA Bottom View CRT CBA Top View Q1521 Q1521 Collector BaseQ1511 Q1511 Collector Base Q1531 BaseWaveforms WF4WF9 CollectorWiring Diagram L2401WIIC111 TV Micro Controller Pin Signal Name FunctionIC PIN Functions White Balance Adjustment JudgementAFT Voltage Input Degaussing Coil Control11-1 11-2 L2401CEX Exploded ViewsCabinet Packing X-2 X-3 Tape Packing Tape 11-3 L2401PEX20040405 12-1 L2401CA Mechanical Parts ListComparison Chart of Models and Marks Electrical Parts List 20040405 13-1 L2401EL20040405 13-2 L2401EL Electrolytic CAP .33∝F/50V M CE1JMASDLR33Connectors 20040405 13-3 L2401EL20040405 13-4 L2401EL ICS20040405 13-5 L2401EL Transistor 2SC2120-YTPE220040405 13-6 L2401EL Switches 20040405 13-7 L2401EL20040405 13-8 L2401EL RCA Jack 1P AV-8.4-9W6420FE/EWF2004 L2401UB/L2404UE

6420FE specifications

The Emerson 6420FE is a robust and versatile platform designed for a variety of industrial applications, particularly in process automation, manufacturing, and control systems. This model represents Emerson’s commitment to innovation and performance, catering to the evolving needs of industries that require reliable and accurate control solutions.

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In conclusion, the Emerson 6420FE is a powerful and reliable device that embodies Emerson’s commitment to innovation in process control and automation. With its advanced processing power, versatile connectivity options, robust safety features, user-friendly interface, and scalability, it stands out as an excellent choice for industries looking to enhance their operational efficiencies and ensure streamlined processes. As technology continues to evolve, the Emerson 6420FE remains a cornerstone in automation solutions, driving productivity and reliability in various industrial applications.