Circuit Protection Parts; Fuses; Circuit Protection Element - Sony HDC4300 Service Manual

1-9.

Circuit Protection Parts

1-9-1.

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 Ref. No.
Name
PS-836 F101
F102
F3001
1-9-2.

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 Ref. No.
Name
CN-3427 THP1
THP2
MB-1278 THP1
THP3
THP4
THP5
PS-836 THP101
RE-291 THP601
THP602
THP603
MEM-147 THP001
THP002
THP003
HDC4300
Address Part No.
E1 (Side A)
1-523-190-11
E3 (Side A)
1-523-190-11
D3 (Side A)
1-576-566-21
Address Part No.
B2 (Side A)
1-802-108-11
B1 (Side A)
1-811-201-11
A2 (Side A)
1-811-201-11
A1 (Side A)
1-811-201-11
B2 (Side A)
1-811-201-11
D2 (Side A)
1-803-615-21
C1 (Side A)
1-802-108-11
B3 (Side B)
1-803-615-21
A1 (Side B)
1-803-353-21
B1 (Side B)
1-803-615-21
1-803-615-21
1-803-615-21
1-803-615-21
Ref. No. Address Part No. Part
Name/Rating
Fuse (SMD) 6.3 A/250 V
Fuse (SMD) 6.3 A/250 V
Fuse (SMD) 15 A/65 V
Hold Current
1.50 A/20 ℃
2.60 A/20 ℃
2.60 A/20 ℃
2.60 A/20 ℃
2.60 A/20 ℃
0.50 A/20 ℃
1.50 A/20 ℃
0.50 A/20 ℃
0.14 A/20 ℃
0.50 A/20 ℃
0.5 A/20 ℃
0.5 A/20 ℃
0.5 A/20 ℃
Continued
1-20