Circuit Protective Devices; Fuse; Thermistor - Sony HDCU2500 Maintenance Manual

1-13.

Circuit Protective Devices

1-13-1.

Fuse

WARNING
The fuse is critical parts to safe operation. Replace the components with Sony parts whose part number
appear in the manual published by Sony. If the components are replaced by any parts other than the specified
ones, this may cause a fire or electric shock.
CAUTION
If fuse is replaced while the main power is kept on, this may cause electric shock. Before replacing fuse, not
only turn off the POWER switch but also remove the power cable that is connected to the Optical/electrical
connector.
This unit is equipped with fuse. Any an excessive current flow due to abnormality inside the equipment, the fuse blow.
If a fuse blows, turn off the main power of the equipment once and inspect inside of the equipment and remove the cause
of excessive current. After that, replace the fuse.
Board name Ref. No.
PS-778D00 F101
1-13-2.

Thermistor

This unit is provided with a positive coefficient thermistor (for power supply) as a circuit protective device. If an over
current flows in a positive coefficient thermistor or it heats up to a certain degree with the increase of the ambient
temperature, its internal resistance increases sharply to limit the current flowing in the circuit. When a thermistor is
activated, turn off the power and check the circuit of the unit.
After the cause of the problem is removed and the device cools down, turn on the power again. The unit will work
normally.
It takes about one minute for the device to cool down after power-off.
Board Ref. No.
AT-167A THP1
THP2
THP3
THP4
THP101
AU-340 THP1
AVP-15 THP101
THP102
THP103
THP104
THP105
HDCU2500
Address Name
F2 (Side A) Fuse (6.3 A /250 V)
Address
H1 (Side A)
H1 (Side A)
C1 (Side A)
C1 (Side A)
C3 (Side A)
C2 (Side A)
H4 (Side A)
H4 (Side A)
H2 (Side A)
H2 (Side A)
H3 (Side A)
Part No,
1-523-140-11
Part No,
1-533-817-21
1-804-458-21
1-803-353-21
1-803-615-21
1-803-615-21
1-804-616-21
Continued
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