Basic Guides to Troubleshoot your Circuit Mohamad Taib

Basic Guides to Troubleshoot your Circuit Mohamad Taib bin Miskon

Contents • • Tools Knowledge/skills Diagnose, repair/replace, verify Common errors/mistakes

Basic tools • • Multimeter (analog/digital) Test pen Solder, Soldering iron, sucker etc Helping hand

Knowledge- measurement • Measuring voltage n current • Measuring signal using Oscilloscope

Knowledge- circuit operation • Understanding your circuit – timer 555

Knowledge- circuit operation • Understanding your circuit – relay

Knowledge- circuit operation • Understanding your circuit – ADC

Knowledge- circuit operation • Understanding your circuit – PIC

Knowledge- circuit operation • Understanding your circuit – Regulator

Knowledge- circuit operation • Understanding your circuit – I/O

Knowing your system • What is your system? Block diagram? flow? • What is your i/o? signal? • Your program? (if any) • Your load?

Troubleshooting • Diagnose – what is the problem? • Symptoms? Hardware? Software/firmware? • output? input? Continuity test? • Power source?

Troubleshooting • • Hardware troubleshooting: Voltage check Continuity check Signal check

Troubleshooting • Hardware troubleshooting: Examples

Troubleshooting • • Software troubleshooting: Blink test Program check Software setting etc.

Troubleshooting • Repair – replace the faulty component • Determining eq components? • Reading datasheet

Troubleshooting • Verify • Does your circuit operate/responds accordingly?

Common mistakes • • • PCB trace not connected improper grounding VDD, VSS on PIC circuit Sensor-to-switch replacement Power source- over/under voltage

Common mistakes • • • Improper load selection Improper circuit combination Wrong polarity IC not programmed Wrong compiler

Tq for listening, ANY QUESTION? ?