Tektronix 494AP service manual O o o, CONTENTSGonr

49441494APServtceVot. i

	TABLE
			OF CONTENTS(Gonr.)
					page					Page
	PERFORMANCE
Section 4							15.AdjustBandLevelingfor
		CHECK(Conr.)
	24.CheckLO Emission			.....4-29			WaveguideBands				5	-25
			point	.......	4-29		16.PhasELockCalibration				5	-2S
	25.Check1 dB Compression						OPTIONINSTRUMENTSONLY				5	-29
	26.CheckExternalReference
	InputPower			....4		-31	17. AdjustOption07 VR BandLeveling				5-29
							18.AdjustOption42 Module
	27.CheckTriggeringOperation										5	-29
	andSensitivity			.....4		-31
	28. CheckExternal						Section 6 MAINTENANCE
	SweepOperation		...............		4	-92
	29.CheckVERTOUTPUT				4	-34	TNTRODUCTTON
			Signat								6	-1
	30. CheckHORTZOUTPUT						Removingthe
	SignafLevel			....4-94			lnstrumentfromits Cabinet				6	-1
	oPTloN TNSTRUMENTS
	31. CheckOption07		.......................		4	34	static-sensitivecomponents				6-1
							PREVENTIVEMAINTENANCE				6.2
	CalibratorOutput		...............		4	-94	ElapsedTimeMeter				6-2
	32. CheckOption07						Cleaning	-			6-2
	FrequencyResponse		.........		4	-95
							Lubrication				6-2
	33. CheckOption4i Frequency						FixturesandTools
	Span/DivAccuracy		............		4	-gz	for Maintenance		,.........6-2
	34. CheckOption42						Visuallnspection				6	-2
	110MHzOUTLevel		..........		4	-gB
							TransistorandIntegrated
	35.GheckOptiopn42110MHztF						CircuitChecks	..........			6	-2
	OutputBandwidth,CenterFrequency,						PerformanceChecks
	BandpassRipple,and Symmetry						andRecalibration				6	-3
	About110MHz		..................			4-gg	SavingStoredDatain
	GPIBVERIFICATTON		..........		4	-39	Battery-BackupMemory				6	-3
		PROGRAM
							TROUBLESHOONNG	........			6.3
Section5	ADJUSTMENT						TroubleshootingAids				6	-9
							Diagrams				6	-3
	Introduction			.... 5-1			CircuitBoard
	EquipmentRequired		..........		5	-1	lllustrationsandComponent
	ADJUSTMENTPROCEDURE				5	-2	LocatorCharts		.....6-4
	PREPARATON						Diagnostics	..........			6-4
				.....5-2
		.............					GeneralTroubleshooting
	1. AdjustLow Voltagepower Suppty...				5-3
	2. AdjustZ-Axis and						Techniques				6	-4
	HighVoltageCircuits		.........		5	-5	SemiconductorChecks				6-4
	3. AdjustDeflectionAmptifier						DiodeChecks				6-4
	GainandFrequencyResponse				5	-6	DiagnosticFirmware				6,...-5
	4. Adjust	DigitalStorage					TroubleshootingSteps				6-5
				....	5-g
	5. AdjustSweepTiming		Calibration				DTAGNOSTTCS				6-5
				....5-g
	6. AdjustFrequency						TROUBLESHOOTINGUSING
		GontrolSystem					THEERRORMESSAGEDISPLAY....				6.5
	andDot MarkerPosition			.... S-g
	7. AdjustLogAmplifier				5	-11	Introduction					6-5
	8. AdjustResolutionBandwidth						Combinationof ErrorMessages				6-6
	andShapeFactor		..............		5	-14	ProcedureFormat		.... 6-6
	9. Presetthe VariableResolution						TRACEMODES				6	-14
	GainandBandLeveling.....,						AlternateFrequencyDisplay				6-14
	10.AdjustCalibrator				5	-19	AuxiliarySynthesizerControl				6	-14
			........		5-20
		OutputLevet					CorrectionDisable/Enable			- 6-14
	11.AdjustlF Gain		..............		S-20
	12.AdjustB-SAVEA						coRRECTtVEMATNTENANCE				6	-15
	RefergnceLevel			.......5-21			HandlingStaticSensitive					65-1
	13.AdjustPreselector		................		S-21		Components
		Driver					ObtainingReplacementParts				6	-15
	14.AdjustBandLevelingfor
	CoaxialBands		...................		5-24		PartsRepairand Return				6-15
							Program

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