TCS Pune

Crystal and clock diagnosis

Guided diagnostic

Crystal and clock diagnosis

Check configuration, oscillation and timing accuracy.

Medium riskPIC, AVR, 8051, STM32 and external-crystal boards

Tools checklist

  • Digital multimeternUSB data cablenCurrent-limited bench supplynLogic analyser or oscilloscope when indicated

Symptom-to-checkpoint workflow

Start at checkpoint 1. Record the reading, then choose Pass or Fail to follow the correct branch.

Checkpoint 1 · Configuration

Method: Verify fuse/config bits and declared clock frequency

Expected: Selected source matches hardware

⚠ Wrong clock settings can affect programming and UART.

Record this diagnostic run

Log in to save measurements and submit this run to an instructor.

Bench safety

Disconnect power before wiring changes or continuity testing. Confirm polarity and voltage limits. Use a current-limited supply for suspected shorts.

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