1-15. Circuit Protection Parts
1-15-1. Fuses
WARNING
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.
CAUTION
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.
Address
Part No.
Part Name/Rating
PS-879
F101
E2 (Side A)
1-523-181-11
Fuse (SMD) 3.15 A/600 V
F102
E3 (Side A)
1-523-181-11
Fuse (SMD) 3.15 A/600 V
F3001
D3 (Side A)
1-576-566-21
Fuse (SMD) 15 A/65 V
R153
D1 (Side A)
1-246-193-11
Square type fuse resistor 10 Ω, 0.063
W
R244
D2 (Side A)
1-246-193-11
Square type fuse resistor 10 Ω, 0.063
W
R245
D2 (Side A)
1-246-193-11
Square type fuse resistor 10 Ω, 0.063
W
R246
D2 (Side A)
1-246-193-11
Square type fuse resistor 10 Ω, 0.063
W
R247
D2 (Side A)
1-246-193-11
Square type fuse resistor 10 Ω, 0.063
W
1-15-2. 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.
Address
Part No.
Hold Current
CN-3643
THP1
— (Side A)
1-802-108-11
1.50 A/20 °C
THP2
— (Side A)
1-802-108-11
1.50 A/20 °C
MB-1207
THP1
— (Side A)
1-802-108-11
1.50 A/20 °C
THP2
— (Side A)
1-802-108-11
1.50 A/20 °C
THP3
— (Side A)
1-802-108-11
1.50 A/20 °C
THP4
— (Side A)
1-802-108-11
1.50 A/20 °C
Continued
HSC300RF/HSC100RF/HSC300R/HSC100R
1-37
