Thermal Dynamics C-20A Cutskill Service Manual page 26

6. Reverse the meter leads across the diode for reverse bias testing (refer to following figure). A properly functioning
diode will block in the reverse bias direction and depending on the meter function will indicate an open or "OL".
7 Using the Figures for each test, check each diode in the module. Each diode must be checked in forward bias (plus
to negative) and reverse bias (negative to plus) direction.
TROUBLE SHOOTING
Reverse Bias
Diode Not Conducting
Cathode
Anode
Testing Diode Reverse Bias
6-6
Art # A-00306
OL
VR COM A
_
+
Manual 0-4697