150 T / 150 W
Ultima modifica/ Last Modify: 18/03/2008 Rev0 pagina 14 di 17
EXPLANATION
Input bridge rectifier .
To check the Input bridge rectifier , carry out the following
measurements with a diode tester:
Should there be a short circuit on one of these measurements,
the input bridge rectifier must be replaced.
To check the inverter, carry out the following measurements
with a diode tester:
Should there be a short-circuit on one of these measurements
or an “OL” instead of a numeric value, the power board must
be replaced.
The varistor is a blue disc near the ground wire of the power
board. This device is for protecting the board from input
overvoltage. When there is overvoltage it “explodes” causing a
short circuit most of the times. If the extent of the short circuit
is very high they become an open circuit.
Faston
Probe
Faston
Probe
Measure
F+
red
D
black
“OL”
F
red
D
black
>.450
F+
black
D
red
“OL”
F-
black
D
red
>.450
P
IC
T
U
R
E
3
F+
D
F-
D
G D S
G
D
S
G
D
G
D
S
P
IC
T
U
R
E
4
Red Probe
Black Probe
Measure
S
G
0.28
G
S
0.6
P
IC
T
U
R
E
5
Varistor
