LONCIN LC3000i - Outer Case Assembly

SECTION 4. DISASSEMBLY AND SERVICE
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
conducti
ve
Not
conductiv
e
Conducti
ve
Blue
Not
conductiv
e
Not
conducti
ve
conductiv
e
Red
Conductiv
e
Conducti
ve
Conducti
ve
Black
Not
conductiv
e
Not
conducti
ve
Not
conducti
ve
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
Blue
Black
Red
Blue
Blue
Black
Rectifier bridge
Multimeter
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