1-7.
Circuit Protection Parts
1-7-1.
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.
Model name
Board name
Ref. No.
Address
Name
Part No.
XVS-9000
CN-4018
TH001
L-1
Thermistor
1-802-063-21
CN-4019
TH001
L-1
Thermistor
1-802-063-21
CN-4020
TH001
B-1
Thermistor
1-811-201-11
TH002
B-1
Thermistor
1-811-201-11
HN-442
TH001
P-1
Thermistor
1-802-063-21
XVS-8000/
XVS-7000/
XVS-6000
CN-3807
TH001
B-1
Thermistor
1-811-201-11
TH002
A-1
Thermistor
1-811-201-11
CN-3826
TH001
A-1
Thermistor
1-802-063-21
XKS-8440
VPR-129
TH3501
K-3
Thermistor
1-802-108-11
TH3502
J-1
Thermistor
1-802-108-11
TH3503
J-1
Thermistor
1-802-108-11
XKS-Q8111
NET-32
TH4301
N-7 (Side B)
Thermistor
1-804-616-11
TH4302
N-7 (Side B)
Thermistor
1-804-616-11
TH4303
N-7 (Side B)
Thermistor
1-804-616-11
TH4401
A-7 (Side B)
Thermistor
1-804-616-11
TH4402
A-7 (Side B)
Thermistor
1-804-616-11
TH4403
A-7 (Side B)
Thermistor
1-804-616-11
XKS-Q8166
NET-32A
TH4301
N-7 (Side B)
Thermistor
1-804-616-11
TH4302
N-7 (Side B)
Thermistor
1-804-616-11
TH4303
N-7 (Side B)
Thermistor
1-804-616-11
TH4401
A-7 (Side B)
Thermistor
1-804-616-11
TH4402
A-7 (Side B)
Thermistor
1-804-616-11
TH4403
A-7 (Side B)
Thermistor
1-804-616-11
XKS-S8110
CNI-43
TH001
B-1
Thermistor
1-811-201-11
TH002
B-1
Thermistor
1-811-201-11
XKS-S8165
CNO-43
TH001
B-1
Thermistor
1-811-201-11
TH002
B-1
Thermistor
1-811-201-11
1-7-2.
Replacing Fuses and IC Links
WARNING
The fuse and the IC link are essential parts for safe operation. Replace it with one whose part number is
listed in the manual. If the components are replaced with any parts other than the specified ones, this may
cause a fire or electric shock.
XVS-9000-C/XVS-8000-C/XVS-7000-C/XVS-6000-C
1-12