Hitachi C 12LDH Technical Data And Service Manual page 52

Item
Phenomenon
Saw blade does not
4
rotate when switch is
triggered.
Saw blade runs too
5
slow (not within
3,600 --- 4,400 min
6 Laser marker does not
light.
Laser light is poor or
7
strong.
Cause
a The power cord is not
connected to power
supply.
b The carbon brush
wear exceeds
allowable limit (5 mm).
c Contact failure of the
micro switch
a Power supply voltage
is lower than rated
-1
).
voltage.
a Improper wiring
b Switch (B) failure
c Switch (A) failure
(Only Model C 12LDH)
d Switching power
supply failure
e Laser module ass'y
failure
a Switching power
supply failure
b Laser module ass'y
failure
Factory
standard
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Inspection, repair or
adjustment
• Check power supply voltage.
• Connect the power cord to
power supply.
• Check the Carbon Brushes
(1 Pair) [237] for wear.
• Replace the Carbon Brushes
(1 Pair) [237].
• Check the Switch (3P Faston
Type) [226] for conductivity.
• Replace the Switch (3P Faston
Type) [226].
• Check power supply voltage.
• Check if extension cord is
appropriate.
• Check the wiring.
• Check Switch (B) (1P Type)
[217] for conductivity.
• Replace Switch (B) (1P Type)
[217].
• Check Switch (A) (1P Type)
[216] for conductivity.
• Replace Switch (A) (1P Type)
[216].
• Check the Switching Power
Supply [220] for conductivity,
input and output referring to
"11-4. Wiring Diagram".
• Replace the Switching Power
Supply [220].
• Replace Laser Module (A) [14].
• Same as item 6-(d).
• Same as item 6-(e).