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Emerson 6420FE Electrical Adjustment Instructions, Test Equipment Required, +B Adjustment

Models: 6420FE

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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. NE122UD

6.DC power supply 13.2V/5A

How to make Service remote control unit:

1.Prepare normal remote control unit. (Part No. NE122UD --- [ 6420FE ])

(Part No. NE154UD, NE142UD, N0108UD, N0132UD, NE116UD, NE153UD, NE141UD, NE122UD, or NE121UD --- [ EWF2004 ])

Remove 3 Screws from the back lid. (Fig. 1-1)

2.Added J1 (Jumper Wire) to the remote control CBA. (Fig. 1-2)

SCREWS

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: 058-0.06)

4.Check the display on the lower left is "2641" and if it is not "2641," set it at "2641" 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	Adj. Point	Mode		Input


TP601(+B)	VR661	---		---
TP300(GND)	VR661	---		---
TP300(GND)

Tape	M. EQ.		Spec.

---	DC Voltmeter	+114±0.5V DC.

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 +114±0.5V DC.

REMOTE CONTROL UNIT				Fig. 1-1

J 1				Fig. 1-2

REMOTE CONTROL CBA

5-1

L2401EA

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Emerson 6420FE Electrical Adjustment Instructions, Test Equipment Required, How to set up the service mode, +B Adjustment

Contents

6420FE EWF2004 Table of Contents Important Safety NoticeDBµv AFT Pull In Range 10mV input MHz ±2.0 ±0.7 SpecificationsDescription Condition Unit Nominal Limit DBµvL6115IMP Important Safety PrecautionsSafety Precautions for TV Circuit Not be Above 0.5 mAL6115IMP Precautions during Servicing Safety Check after Servicing Clearance DistanceLeakage Current Test Pb Lead Free Solder How to Remove / Install Flat Pack-ICStandard Notes for Servicing Circuit Board IndicationsWith Soldering Iron With Iron WireMachine Masking Flat Pack-IC Tape TweezersInstallation Pin 1 of the Flat Pack-IC Is indicated by a markPresolder Incorrect Instructions for Handling SemiconductorsGround for Human Body Ground for WorkbenchReference Notes in the Table Cabinet Disassembly InstructionsDisassembly Flowchart Disassembly MethodRear Cabinet Rear Cabinet Main CBACRT TV Cable Wiring Diagram Service mode Electrical Adjustment InstructionsHow to set up the service mode +B AdjustmentGeneral Initial SettingPurity Check F0 AdjustmentBlack Stretch Control Adjustment SD Check ModeSoftware Reset Position AdjustmentSize Adjustment 10. V. Position AdjustmentTape Spec Cut-off AdjustmentWhite Balance Adjustment Mode InputSub-Brightness Adjustment Focus AdjustmentPurity Adjustment Figures Convergence AdjustmentSystem BlockL2401BLIF IF/Video Block DiagramL2401BLA AudioCRT/H.V Block DiagramL2401BLP DiagramSchematic Diagrams / Cbas and Test Points Standard NotesTolerance of Capacitors are noted with the following Test Point Information Wire ConnectorsHow to read converged lines Is not consistent hereL2401SCM1 Main 1/4 Schematic DiagramL2401SCM2 Main 2/4 Schematic DiagramL2401SCM3 Main 3/4 Schematic DiagramMain 4/4 Ref No Position Main 4/4 & CRT Schematic DiagramBL2700F01012-1 Main CBA Top ViewMain CBA Bottom View Q1531 Base CRT CBA Top ViewQ1521 Q1521 Collector Base Q1511 Q1511 Collector BaseWF4 WaveformsCollector WF9L2401WI Wiring DiagramPin Signal Name Function IC PIN FunctionsIC111 TV Micro Controller Degaussing Coil Control White Balance AdjustmentJudgement AFT Voltage InputExploded Views Cabinet11-1 11-2 L2401CEX X-2 X-3 Tape Packing Tape 11-3 L2401PEX PackingMechanical Parts List Comparison Chart of Models and Marks20040405 12-1 L2401CA 20040405 13-1 L2401EL Electrical Parts ListElectrolytic CAP .33∝F/50V M CE1JMASDLR33 20040405 13-2 L2401EL20040405 13-3 L2401EL ConnectorsICS 20040405 13-4 L2401ELTransistor 2SC2120-YTPE2 20040405 13-5 L2401EL20040405 13-6 L2401EL 20040405 13-7 L2401EL SwitchesRCA Jack 1P AV-8.4-9W 20040405 13-8 L2401EL6420FE/EWF2004 L2401UB/L2404UE