Electronic Repair & Maintenance — Course Brief (Bagz Institute Technology)

Overview

A practical, lab-driven program that trains you to diagnose, repair, and maintain electronic equipment: power supplies (SMPS), amplifiers, inverters/UPS, TVs/monitors, small appliances, and control boards. You’ll master safe work practices, schematic reading, component-level diagnostics, soldering/rework, power electronics basics, microcontroller-based boards, and a professional repair workflow from intake to quality assurance.

Who It’s For

Beginners, hobbyists moving into professional repair, ICT/electrical technicians, and entrepreneurs starting a micro-repair business.

Entry Requirements

• No prior repair experience required

• Comfort with basic arithmetic and using a PC

• Willingness to follow electrical safety and ESD procedures

• Recommended: Laptop with internet for datasheets/tools

Learning Outcomes — You will be able to:

• Read schematics & datasheets, identify components (R, C, L, diodes, BJTs, MOSFETs, regulators, ICs)

• Use a multimeter, bench power supply, and (shared) oscilloscope to trace faults

• Repair common failures in SMPS, audio stages, display drivers, and sensor/IO circuits

• Perform through-hole & SMD soldering, hot-air rework, connector & pad repair

• Diagnose and fix no-power, short-circuit, overheat, no-display, no-audio issues

• Apply ESD, isolation, and mains safety; discharge capacitors safely

• Document jobs, source parts, run QC tests, and hand over professionally

Tools & Lab Requirements

Essential:

• Multimeter (auto-range), precision screwdrivers, ESD strap/mat, tweezers, side cutters

• Temperature-controlled soldering iron, solder (lead-free or 60/40), flux, solder wick

• Isopropyl alcohol (≥99%), brushes, microfiber cloths, magnifier (10–20×)

• Bench power supply (0–30 V, 0–5 A) with current limiting
  Helpful:

• Hot-air rework station, oscilloscope (≥50 MHz), LCR meter, signal generator, thermal camera

• Replacement parts kit (resistors/caps, diodes, regulators, MOSFETs), connectors
  Software (examples): KiCad/EAGLE (schematics/PCB), Arduino IDE/PlatformIO (for MCU boards), USB-serial terminal, vendor datasheets & application notes.

Course Outline (8 Weeks · ~60–72 hours)

Week 1 — Safety, ESD & Foundations
Electric shock hazards, isolation transformers, capacitor discharge, ESD control.
Component ID (passive/active), board anatomy, reading part markings.
Lab: Safety drills, component ID & meter practice.

Week 2 — Instruments & Systematic Diagnostics
Multimeter modes, continuity/diode tests, current limiting with bench PSU.
Intro to oscilloscopes: probing, ground reference, basic waveforms.
Lab: Fault-finding on trainer boards; safe power-up with current limit.

Week 3 — Analog Fundamentals
Ohm’s law, dividers, filters, op-amps (buffers, gain, filters), audio stages.
Lab: Trace an analog signal path; repair a simple pre-amp/power-amp fault.

Week 4 — Digital & MCU Boards
Logic families, regulators (linear vs buck), clock/reset, common ICs.
Intro to microcontrollers, headers (UART/I²C/SPI), boot modes.
Lab: Diagnose a no-boot MCU board; read logs over UART; replace a regulator.

Week 5 — Power Electronics & SMPS
Mains input, rectification, PFC, primary/secondary, feedback/optocouplers.
Common failures: startup resistors, primary MOSFETs, snubbers, secondary shorts.
Lab: Isolated SMPS troubleshooting with lamp-limiter; replace primary parts safely.

Week 6 — Soldering, SMD & Rework
Through-hole vs SMD packages, thermal management, pad repair, connector swaps.
Lab: Hot-air profiles; replace an SMD IC; repair lifted pads and torn traces (jumper wires).

Week 7 — Case Studies: TV/Monitor, UPS/Inverter, Appliance Control Boards
Backlight/LED strips, inverter stages, gate drivers, relays, triacs, sensors.
Lab: Diagnose one full device (no-power/no-display), document, and quote.

Week 8 — Quality Control, Documentation & Business
QC test matrices, SOAK tests, warranty policy, job cards, BOM & sourcing, pricing.
Capstone Lab: End-to-end repair (intake → diagnose → fix → QC → report & handover).

Optional Pro Track (2 extra weeks)

• Microsoldering & SMD fine-pitch (QFN/QFP), jumper techniques, connector re-pads

• Advanced PSU/SMPS topics, thermal profiling, BGA overview (reballing theory)

• JTAG/SWD basics for firmware-tied faults; conformal coating & re-work best practices

Assessment & Certification

• Weekly Labs (40%) — practical checklists & sign-offs

• Diagnostics Challenge (20%) — timed fault-trace & quote

• Capstone Repair (30%) — complete job with QC report and client handover

• Professional Practice (10%) — safety, documentation, communication
  Certificate of Completion awarded upon passing and attendance.

Delivery & Schedule

In-person labs with instructor demos (hybrid theory available).
2–3 sessions/week, 3–4 hours/session. Class size: 10–16 for close supervision.

Support & Career Pathways

Bench access, vetted vendor/parts list, job card & QC templates, and a portfolio of completed repairs to support employment or a repair micro-business.