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Section 4 is intended as a guide to fault diagnosis and repair. It is written for repair staff who are familiar with standard fault-finding procedures and who have the requisite test equipment available. The table below lists the minimum required test equipment and materials.
| Equipment | Specification / Manufacturer |
|---|---|
| Frequency Meter | General Purpose |
| Oscilloscope | Rise time 100 nanosec |
| Digital Multimeter | General purpose |
| Known good LED display unit | Cambridge Computer |
| Known good keyboard unit | Cambridge Computer |
| Mains Adaptor | Cambridge Computer |
| Superglue | Open market |
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