a. PCB Assembly.\ \ First Inspect PCB for hairline shorts and cuts and also traces of unwanted copper in the edges and repair them. Also Check if all Drill holes & Slots are proper size and PCB is Fitting in its Place properly, This is because Drilling and Filing should not be done after assembly as it causes serious reliability problems.  \[teaserbreak\]Second populate all the resistors, Jumpers, Diodes and Ceramic Capacitors these are tough components. Then Insert all Transistors, LEDs, Displays, Electrolytic Capacitors and IC s (Bases), Here care should be taken not to overheat any component as it may damage them. Lastly Solder Connectors, Relays, Coils and Transformers which may require a high wattage Iron, and Mechanical Reinforcements.\ \ b. Precautions during Production. - Observe Polarity for Diodes, El-caps, Connectors, etc. - Make sure of Pin 1 for IC s, Regulators, Transistors and Mosfets before insertion. - Avoid bases for ICs in production as these fail on use. - Make use of Electrostatic protection for CMOS devices. - When Cutting Leads use protective Goggles and do it in a separate place as the cut leads fly all over the place. - Use Iso Propyl Alcohol (IPA) as de-greasing agent on PCB. - Water & Detergent wash is very good but only if coils, Transformers, Relays are hermetically sealed- Impregnated. Use a Lacquer-Varnish or RTV rubber coat on both sides of PCB including on the components to prevent corrosion and also it helps maintain accuracy-precision.\ \ Lead is a kind of poison, use gloves or wash hands with soap after work is over. Flux, IPA, Thinner Fumes can cause respiratory health problems. Work in a ventilated area use Exhaust Fans and Open Windows. Dispose of Metal, Plastic and Chemical waste separately and well packed as these can contaminate the environment and also cause Injury.\ \ _Published online around - Nov 1999_