LONCIN LC3500i - Page 52

Chapter IV Disassembly & Repair
- 47 -
Rectifier bridge
The internal circuit of rectifier bridge is shown as
above. Detect the switching of each terminal of rectifier
bridge with multimeter.
When the switching of rectifier bridge is shown as
below, the rectifier bridge is under the normal status:
Digital
Multimeter
Test with Red Needle
Blue
Blue
Red
Black
Test
with
Black
Needle
Blue
Not
conductiv
e
Not
conductive
Conductiv
e
Blue
Not
conductive
Not
conductiv
e
conductive
Red
Conductive
Conducti
ve
Conductiv
e
Black
Not
conductive
Not
conductiv
e
Not
conductiv
e
Tip 1: “Switching” means the conductivity feature of
diode and differs from short circuit. When the
check of each section fails, replace with a new
rectifier bridge.
Blue
Red
Black
Black
Red
Blue
Blue
Black
Rectifier bridge
Multimeter