Technical data

65
servations Conclusions Ob
DC
Figure T-10
Turned switch ON – no light Definitely a problem in this circuit!
Measured 12 volts between terminal blocks
TB1-1 and TB2-1
Power supply is functioning properly.
Measured no voltage across the light bulb
(between TB2-2 and TB2-3)
Light bulb is not open, just not receiving any
power.
Measured no voltage across closed switch
(between TB1-1 and TB1-3)
Switch is good.
Measured no voltage between terminals
TB1-3 and TB2-3
Wire between TB1-3 and TB2-3 is good
Measured 12 volts between terminals
TB2-1 and TB2-2
Bad connection between those two
terminals. Possibly an open wire or dirty
connection between wire and terminal block.
Replaced wire between TB2-1 and TB2-2.
Light bulb now works!
Problem Solved!
Figure T-11