C128 Crystal Power - How to test crystals in circuit.

About this video

Crystals can be tested in circuit with an oscilloscope, and this C128 repair traces a missing clock to a dead one. The maker says the go/no-go test is done with the machine powered off.

Good to know: Needs an oscilloscope. Part of the Troubleshooting Vintage Computers series.

Why watch it

A go/no-go check, pass or fail, came out of a C128 that died while the maker was working on it, and earlier episodes supply the techniques that narrowed the fault to a missing clock.