21
1-6. Circuit Protection Parts
1-6-1. Fuses
Fuses are essential parts for safe operation. Be sure to use the parts specified in this manual. Replacing a fuse with an unspecified one
may cause fire or electric shock.
Replacing any fuse is replaced while power is supplied to the unit may cause electric shock. Before replacing any fuse, turn off the
POWER switch and also disconnect the battery pack and the cable from the DC IN connector.
This unit is equipped with fuses. The fuses blow if overcurrent flows in the unit due to an abnormality. In that case, turn off the
power of the unit, inspect inside of the unit, and then remove the cause of the overcurrent. After that, replace the defective parts.
Board Name
Ref. No.
Part No.
Part Name/Rating
CN-4066
F001
1-576-566-21
Fuse (SMD) 15 A/65 V
1-6-2. Circuit Protection Element
This unit is equipped with positive-characteristic thermistors (power thermistors) as circuit protection elements.
The positive-characteristic thermistor limits the electric current flowing through the circuit as the internal resistance increases when
an excessive current flows or when the ambient temperature increases. If the positive-characteristic thermistor works, turn off the
main power of the unit and inspect the internal circuit of the unit.
After the cause of the fault is eliminated and the positive-characteristic thermistor is cooled down, turn on the main power again. The
unit works normally. It takes about one minute to cool down the positive-characteristic thermistor after the main power is turned off.
Board Name
Ref. No.
Part No.
Hold Current
IF-1331
TH001
1-771-845-21
200 mA/20
˚C
SY-471
TH201
1-803-615-21
500 mA/25
˚C
TH202
1-805-726-11
0.20 A/25
˚C
WARNING
CAUTION
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