OK, you need to set your multimeter to the continuity test mode, assuming that it has one. This is generally indicated by the following symbol (or very similar) on the meter:
When two test points have circuit continuity in this test mode, the meter should produce an audible tone.
If your meter doesn't have a continuity mode, set it to the lowest range of the resistance mode, usually 200 ohms. In this case, continuity will be indicated by a very low resistance reading, usually no more than a few ohms and often a few tenths of an ohm.
What we want to do here is to make sure that the three legs of your Q1 transistor are connected to the adjacent points of the circuit where they should be. The easiest way to do this is on the back (solder) side of the PCB. Following the marked up photo below, check for continuity between the pairs of points that I've connected with a colored line. It doesn't matter which probe goes to which test point. The collector and base should connect with components close to them, as indicated with the fuchsia lines. The emitter connects to ground, so that should show continuity to eyelet 2 at the bottom of the PCB, shown with the yellow line. Throughout this testing, leave power
disconnected from the circuit. Complete these checks and report your results here.
Attachment:
CF_Q1_cont_check.jpg [ 115.81 KiB | Viewed 2860 times ]
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