random checking

checking step by step

trial and error checking

logical checking

signal generator

signal tracer

signal injector

any one of the above stated equipments

Open speaker coupling capacitor

Open output transistor

Open emitter bypass capacitor

All the above stated defects

a.c. signals only

d.c. signals only

both a.c. and d.c. signals

pulse signals only

voltage follower amplifier

impedance matching amplifier

inverting amplifier with more than one input

none of the above stated