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CIS Rework, Repair & Modification Flashcards

6 cards from real CIS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. According to IPC-7711, what must be done before performing any rework on a Class 3 assembly?

    Answer: Written procedures and engineering authorization must be in place

    For Class 3 assemblies, IPC-7711 requires that rework be performed only with documented procedures and engineering authorization to maintain traceability and reliability.

  2. What is a 'jumper wire' modification in PCB repair, and what IPC standard governs it?

    Answer: A conductor added to a PCB to correct a wiring error or replace a damaged trace, governed by IPC-7711/7721

    A jumper wire is an added conductor used to replace a damaged trace or correct a wiring error; IPC-7711/7721 provides specific requirements for acceptable jumper wire installation.

  3. What is the minimum recommended tip temperature for soldering standard Sn63/Pb37 solder in rework operations?

    Answer: 315–370°C (600–700°F) at the tip with appropriate dwell time

    Soldering iron tip temperatures of approximately 315–370°C (600–700°F) are standard for Sn63/Pb37 rework, providing adequate heat transfer while minimizing thermal damage risk.

  4. When reworking lead-free assemblies, why must technicians be careful about introducing tin-lead solder?

    Answer: Mixing tin-lead into lead-free solder creates a low-melting-point bismuth-tin eutectic that severely weakens joints

    Mixing tin-lead solder into lead-free joints can create low-melting bismuth-tin phases (if Bi is present) or create non-uniform alloy compositions that significantly reduce joint reliability and melting temperature.

  5. What is 'pad conditioning' during SMT rework?

    Answer: Cleaning, re-tinning, or reshaping the solder pad to its proper form before installing a replacement component

    Pad conditioning involves cleaning residual solder from the pad, re-tinning with fresh solder if needed, and verifying the pad shape and condition before installing a replacement component.

  6. According to IPC-7711, rework documentation should include which of the following?

    Answer: Component reference designator, defect description, procedure used, materials used, and operator identification

    IPC-7711 rework documentation must include the reference designator, defect description, rework procedure number, materials used, and operator identification to maintain full traceability.