Tektronix 494AP service manual 367-028s,00, TroubleshootingAids, Maintenance- 494A1494ApServiceVol

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Maintenance- 494A1494ApServiceVol. 1

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Table 6-2

SERVICE KITS AND TOOLS

Nomenclature

ServiceKit consistingof: 'lFront panelextender

1 Powermoduleextender

IAccessoriesInterface extender

1 Ribboncabte

3Coaxialcables,Sealectromale-to-S€atectrotemate

1 VR modulehandle

1Circuitboardextenderassemblykit consiiiingof: I Left €xtender board

2 Rightexlenderboards

1 Right GPIB extender board

1 Frameeldrusionfor circuitboardextender

6 Screws,panheadwith flat and tockwasheii screwdriver,flat,with 1/4 to 3lg-inchbit

Screwdriver, posidrive@ 440-2

Tekfonix Part No.

006-3286-01

067-0973-00

067-0971-00

067-0972-00

175-2901-00

17$2902-00

367-028s,00

672-0865-01

670-5562-00

670-5s63-00

670-8493-00

426-1527-A0

211-0116-00

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Wrench,5/16-inchopen-end

Hexdrivewrenches,glg2, SI€/',ZlGzt-inch

TorqueWrenchKit

Performance Checks and Recalibration

The instrument performance should be checked after each 2000 hours of operationor every 12 months if the instrumentis used intermittentlyto insure max_ imum performanceand assist in lociting defects that may not be apparentduring regularoperation. Instruc_ tions for conductinga performancecheck are provided by the Performance Check section of the service instructions.

003-1324-00

Saving Stored Data in Battery-Backup Memory

lf backup-battery power to the memory is inter- rupted,suchas when changingthe battery,data stored in battery-backedup memorywill be lost. This datacan

be down-loadedonto tape usingthe programprovided at the end of this section.

Macros cannot be down-loadedonto tape. How- ever,thesemacroscan be readilyreconstructedif they had beensavedon a tape or disc.

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TROUBLESHOOTING

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The spectrum analyzyercontains firmware that will troubleshoot the frequency control system and the power supply. Troublsshootingprocedurefor this sys_ t€m andthe powersupptyis providedln the Diagnostics part of this section. Also includedwith this part is a descriptionof the trace modesand their actions. After th€ def€ctiveassemblyor componenthas be€n tocated, refer to the ReplacingAssembliesand Sub_assemblies pert of this section tor removaland repfacementinstruc_ tions.

TroubleshootingAids

Diagrams - Functional block and circuit diagrams. on foldout pages in the Diagrams section, eontain significantwaveforms, voltages, and togic data informa- tion. Conditions for getting the data are provided on the diagram or adjacent to it. Refer to the Replaceable Electrical Parts list section for a description of all assemblies and components. Diagrams are arranged in signal flow sequence and by sections, such as RF sec- tion, lF section, frequency control section, etc., with an accompanying functional block diagram.

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6-3