Whether you are using cassette or diskette, a malfunction is more likely to be caused by the software than any other reason. This chapter even gives you information on how diskettes and cassettes are made. The electronics of a computer rarely break down. More prone to failure are the mechanical parts - and particularly the disk drives or cassette drives. Chapter 4 goes through the drives for the particular computer, including how to diagnose a problem, how to fix most problems, how to disassemble the drive and even how to install a replacement.
RAM chips are particularly prone to getting zapped by power fluctuations.
Many other chips are equally prone to damage. Chapter 5 discusses circuit board problems, again with diagnosis, testing, replacement, and so forth. To provide this is the power supply. Complete diagnostics are given in this chapter, along with how to replace a malfunctioning unit. The same chapter covers the keyboard, the printer, and the monitor.