JVC AV-20NMG3/-A, AV-20N3/D Replacement of Chip Component, Soldering Iron, Replacement Steps

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AV-20N3

AV-20NMG3

AV-20NMG3B

REPLACEMENT OF CHIP COMPONENT

!CAUTIONS

1.Avoid heating for more than 3 seconds.

2.Do not rub the electrodes and the resist parts of the pattern.

3.When removing a chip part, melt the solder adequately.

4.Do not reuse a chip part after removing it.

!SOLDERING IRON

1.Use a high insulation soldering iron with a thin pointed end of it.

2.A 30w soldering iron is recommended for easily removing parts.

!REPLACEMENT STEPS

1.How to remove Chip parts $ Resistors, capacitors, etc

(1)As shown in the figure, push the part with tweezers and alternately melt the solder at each end.

(2) Shift with tweezers and remove the chip part.

2. How to install Chip parts

$Resistors, capacitors, etc

(1)Apply solder to the pattern as indicated in the figure.

(2)Grasp the chip part with tweezers and place it on the solder. Then heat and melt the solder at both ends of the chip part.

$Transistors, diodes, variable resistors, etc

(1)Apply extra solder to each lead.

SOLD E R

SOLD E R

(2)As shown in the figure, push the part with tweezers and alternately melt the solder at each lead. Shift and remove the chip part.

Note : After removing the part, remove remaining solder from the pattern.

$Transistors, diodes, variable resistors, etc

(1)Apply solder to the pattern as indicated in the figure.

(2)Grasp the chip part with tweezers and place it on the solder.

(3)First solder lead A as indicated in the figure.

A

B

C

(4) Then solder leads B and C.

A

B

C

No.52025

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Contents Contents AV-20NMG3 SpecificationsEnts AV-20N3Safety Precautions VIDEO/CHROMA Decorder SCL 1/SDA1 FeaturesMemory SCL 2/SDA2 Micro ComputerFront Panel Rear Terminal FunctionsRemote Control Unit Part Name Main Difference ListModel Name Disassembly Procedure Specific Service InstructionsSpeaker System CONSTANT-Ⅱ KEY Assignment of Remote Control UnitService Menu System CONSTANT-ⅠSetting item Setting value Setting of System Constant SETSetting item Setting contents User Setting ValuesInitial Setting Value of Service Menu Sound System Do Not Adjust Setting item PresetPAL Secam Procedures Replacement of IC301 if V/C DecoderLocations of Front Panel Buttons and LAM PS Measuring Instrument and Fixtures Service AdjustmentsBefore Starting Service Adjustment Adjustment ItemsKEY Assignment of Remote Control Unit Service Menu Basic Operation of Service MenuShould be OFF Method of settingC, 3.DEF and 4.VSM Preset Setup TourService Menu Flow Chart Upperfocus Adjustment LocationsSolder Side TOPIf Circuit Adjustment AdjustmentsB1 Power Supply Focus AdjustmentAGC Take Over Other Delay PointPoint AGCVideo / Chroma Circuit Adjustment SUB Method of adjustment without measuring instrumentSUB Bright Ad justment RemoteColour Ⅱ CRT TintSocket BL ACK BL AdjustAd justment part Description Remote Secam Control unitPosition Deflection Circuit AdjustmentTOP VSM Preset SettingVER. Scurve ScurvePurity Adjustment Purity / Convergence Adjustment# P/C Magnets Dynamic Convergence Adjustment Static Convergence AdjustmentReplacement Steps Replacement of Chip ComponentSoldering Iron AV-20N3 AV-20NMG3 AV-20NMG3B