Tektronix 494AP service manual O o o o o a o o o o o o A a, Mafntenance- 494l4g4Ap ServtceVot.1

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Mafntenance- 494[l4g4Ap ServtceVot.1

SERvIcING
	TooLs
		FoRBoARD'Tffi3.i*,o"=
			MouNTEDcoMPoNENTs
HorAlr HepairTerminal		Model Type		Tektronix Part No.
	Nu-ConceptsSystemsHART2OOA			N/A
Tempilaq	Nu-Concepts
TempilaqThinner		Systems		N/A
	Nu-ConceptsSystemsTLTH
				N/A
FluxDispenser
	Nu-Concepts
Solderinglron		systemsFD2		N/A
	HexaconModelSMD1O
				003-1401-00
uordertngtronSMDTips
Semi-Chisel,1/16'	HexaconModet ZTAOX			003-1402{0
Conical,1132'
	HexaconModet ZTB}X
				003-1403-00
SharpContcat"
	HsxaconModet ZI&4X			@3-1404-00
Bevel,1/32"	HexaconModel ZZ$6X
				003-1405-00
Chisel,1/16'
	H€xaconModelZZTX			003-140&00
Bevel,l/16'	HexaconModetZT$BX
				003-1407-00
0.062"Stot"	HexaconModel5303
				003-1408-00
0.195"Slot
	HexaconModelS30g			003-1409-00
0.195"Slot
	HexaconModelS314			003-1410-00
0.195'Slot	HexaconModel3316			003-141-00
0.195"Stot
	HexaconModified3302			003-1412-00

titainbss Steel, Non-Magnetic Tweezers

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StraightTip

CurvedTip

Replacing Surface-Mounted Components

AHot Air Machine, such as Hart Model 200A manufacturedby Nu-ConceptComputerSystems lncor_ porated of Colmar, pennsylvania,is recommendedfor unsoldering and soldering surface-mounted com- ponents.

Table 6-5lists tools that are suitablefor servicing circuitboardswith surfac€-mouni€dcomponents.

. Do not apply too much heat, as th€ pad/s on which the device is soldered may be lifted fiom the circuit board.

1.Unsolderthe component.

2.Cleanthe boardwith isopropylalcohot.

3.Solder in the replacement. Surface-mountecl componentsare pretinned,and shoutdbe solderedonto the boardwith solderpasteratherthansolder.

Tektronix Part No. 003464-00

TektronixPart No. 003-046$.00

Tektronix Part No.251-051

4-00

lf you use a solderingiron, use one with a small tip. After applying th€ sotderpaste, touch the corner of the pad with the iron to fasten the component. Avoid touchingthe component with the hot soldering iron. Thermalshock causes hairlinecracks that are not visibleto the eye.

Transistor and Integrated Circuit Configurations

Lead identificationfor transistorsand integratedcir- cuits, is readily available from manufacture'sdata books. Integrat€dcircuit pin-outsfor Vcc and ground

are shownwith a box on the schematicdiagram.Refer to SolderingTechniquein CorrectiveMaintenancepart for unsolderingandsolderinginstructions.

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