JVC AV-20N3/D, AV-20NMG3/-A, AV-20NMG3B Replacement of IC301 if V/C Decoder, Procedures

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AV-20N3

AV-20NMG3

AV-20NMG3B

REPLACEMENT OF IC301 (IF V/C DECODER)

"For the IC301(IF V/C DECODER) of this model, all data are written in the micro-computer. So, write the data in the micro- computer in accordance with the following procedures before starting adjustment.

PROCEDURES

(1)Turn the POWER OFF.

(2)Replace the IC301 with a new one.

(3)While pressing MENU button and VOL+ button ON the FRONT CABINET simultaneously, turn the POW ER ON. When the POWER is turned ON, the data is written in the micro-computer immediately.

LOCATIONS OF FRONT PANEL BUTTONS AND LAM PS


	1		MENU buttons

	2		CHANNEL －･ /＋/ buttons･ buttons
			(MENU －･ /＋/ buttons)･ buttons)

	3		VOLUME －/＋ buttons
	3		(MENU －/＋ buttons)
			(MENU －/＋ buttons)

	4		AI ECO sensor

	5		REMOTE CONTROL sensor

	6		ON TIMER lamp

	7		POWER lamp

	8		MAIN POW ER button

No. 52025

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Contents Contents AV-20N3 SpecificationsEnts AV-20NMG3Safety Precautions Micro Computer FeaturesMemory SCL 2/SDA2 VIDEO/CHROMA Decorder SCL 1/SDA1Functions Front Panel Rear TerminalRemote Control Unit Model Name Main Difference ListPart Name Specific Service Instructions Disassembly ProcedureSpeaker System CONSTANT-Ⅰ KEY Assignment of Remote Control UnitService Menu System CONSTANT-ⅡUser Setting Values Setting of System Constant SETSetting item Setting contents Setting item Setting valueInitial Setting Value of Service Menu PAL Secam PresetSound System Do Not Adjust Setting item Locations of Front Panel Buttons and LAM PS Replacement of IC301 if V/C DecoderProcedures Adjustment Items Service AdjustmentsBefore Starting Service Adjustment Measuring Instrument and FixturesBasic Operation of Service Menu KEY Assignment of Remote Control Unit Service MenuSetup Tour Method of settingC, 3.DEF and 4.VSM Preset Should be OFFService Menu Flow Chart TOP Adjustment LocationsSolder Side UpperfocusFocus Adjustment AdjustmentsB1 Power Supply If Circuit AdjustmentAGC Delay PointPoint AGC Take Over OtherVideo / Chroma Circuit Adjustment Ad justment Remote Method of adjustment without measuring instrumentSUB Bright SUBColour Ⅱ Socket TintCRT Secam Control unit BL AdjustAd justment part Description Remote BL ACKDeflection Circuit Adjustment PositionScurve VSM Preset SettingVER. Scurve TOP# P/C Magnets Purity / Convergence AdjustmentPurity Adjustment Static Convergence Adjustment Dynamic Convergence AdjustmentSoldering Iron Replacement of Chip ComponentReplacement Steps AV-20N3 AV-20NMG3 AV-20NMG3B