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1-9. Circuit Protection Parts
1-9-1. 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.
1-9-2. 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.
The unit is equipped with fuses. The fuses blow if overcurrent flows in the unit due to an abnormality. In
that case, turn off the main power of the unit once, 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.
Hold Current
CR-1006
TH6500
1-805-725-11
13.2 V/0.5 A
DD-1020
TH2001
1-805-868-11
24 V/0.75 A
VC-1046
TH0820
1-805-868-11
24 V/0.75 A
Board Name
Ref. No.
Part No.
Rating
CHG-1003
F1001
1-523-519-11
32 V/2.5 A
CR-1006
F6500
1-576-286-31
24 V/1.4 A
DC-1023
F101
1-576-751-11
32 V/5 A
HN-1054
F0401
1-523-133-31
50 V/1.4 A
LC-1052
F1200
1-523-378-11
32 V/2.5 A
PD-1066
F2201
1-576-596-41
36 V/1.0 A
VC-1046
F0050
1-576-751-11
32 V/5 A
F9801
1-576-751-11
32 V/5 A
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