JVC AV-20NMG3/-A, AV-20N3/D, AV-20NMG3B service manual Delay Point, Agc, AGC Take Over Other

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AV-20N3

AV-20NMG3

AV-20NMG3B

Item		Measuring		Test point		Ad justment part			Description
Item		instrument		Test point		Ad justment part			Description
		instrument

Ad justment		Signal			DELAY POINT			1. Input a black and white signal (colour off).
of DELAY		generator			(AGC TAKE-OVER)			2. Enter the SERVICE MENU.
of DELAY					(AGC TAKE-OVER)			2. Enter the SERVICE MENU.
POINT		Remote						3.	Select 1. IF from the SERVICE MENU.
(AGC)		control unit						4.	Select 2. DELAY POINT by pressing the 2 key on the remote
									control unit.
								5.	Set the setting values of the setting items as shown bellow
									table.
								6.	Then adjust the MENU - or + key until video noise disappears.
								7.	Turn to other channels and make sure that there are no
									irregularities.
		DELAY POINT		UHF
		AGC TAKE-OVER **
		- / + : OPERATE		DISP : EXIT

	Setting Item		Variable range		Initial setting value


				MATSUSHITA	MURATA	ALPS
	DELAY POINT	NT SC 3.58		(QAU0287-001)	(QAU0185-004)	(QAU0282-001)
	DELAY POINT		0～127	45	45	45
	(AGC TAKE OVER)	OTHER	0～127	45	45	45

				35	45	35

No. 52025

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Contents Contents Ents SpecificationsAV-20N3 AV-20NMG3Safety Precautions Memory SCL 2/SDA2 FeaturesMicro Computer VIDEO/CHROMA Decorder SCL 1/SDA1Front Panel Rear Terminal FunctionsRemote Control Unit Main Difference List Part NameModel Name Disassembly Procedure Specific Service InstructionsSpeaker Service Menu KEY Assignment of Remote Control UnitSystem CONSTANT-Ⅰ System CONSTANT-ⅡSetting item Setting contents Setting of System Constant SETUser Setting Values Setting item Setting valueInitial Setting Value of Service Menu Preset Sound System Do Not Adjust Setting itemPAL Secam Replacement of IC301 if V/C Decoder ProceduresLocations of Front Panel Buttons and LAM PS Before Starting Service Adjustment Service AdjustmentsAdjustment Items Measuring Instrument and FixturesKEY Assignment of Remote Control Unit Service Menu Basic Operation of Service MenuC, 3.DEF and 4.VSM Preset Method of settingSetup Tour Should be OFFService Menu Flow Chart Solder Side Adjustment LocationsTOP UpperfocusB1 Power Supply AdjustmentsFocus Adjustment If Circuit AdjustmentPoint Delay PointAGC AGC Take Over OtherVideo / Chroma Circuit Adjustment SUB Bright Method of adjustment without measuring instrumentAd justment Remote SUBColour Ⅱ Tint CRTSocket Ad justment part Description Remote BL AdjustSecam Control unit BL ACKPosition Deflection Circuit AdjustmentVER. Scurve VSM Preset SettingScurve TOPPurity / Convergence Adjustment Purity Adjustment# P/C Magnets Dynamic Convergence Adjustment Static Convergence AdjustmentReplacement of Chip Component Replacement StepsSoldering Iron AV-20N3 AV-20NMG3 AV-20NMG3B