Circuit Protective Devices; Fuse; Circuit Protection Element - Sony HDCU3500 Service Manual

1-9.

Circuit Protective Devices

1-9-1.

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 and Triax 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-939 F101
ENC-185 F010
MDC-23 F100
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 name Ref. No.
PS-939 TH101
TH102
RE-345 TH103
TH3001
SY-467 TH300
TX-167B TH201
TH202
TH203
TH204
ENC-185 TH401
TH402
HDCU3500/HDCU5500
Address Name
Side A Fuse (10 A/250 V)
Side B Fuse (8 A/125 V)
Side A Fuse (4 A/125 V)
Name
POWER THERMISTOR
(10D2-18LCS)
POWER THERMISTOR
(10D2-18LCS)
THERMISTOR (POSITIVE)
(PTFM04BC222Q***S)
THERMISTOR (POSITIVE)
(PTFM04BC222Q***S)
THERMISTOR (POSITIVE)
THERMISTOR (POSITIVE)
THERMISTOR (POSITIVE)
THERMISTOR (POSITIVE)
THERMISTOR (POSITIVE)
THERMISTOR (POSITIVE)
THERMISTOR (POSITIVE)
Part No,
1-576-395-51
!
1-576-328-21
!
1-576-270-21
!
Part No.
1-811-559-31
!
1-811-559-31
!
1-811-824-11
!
1-811-824-11
!
1-803-615-21
!
1-805-762-11
!
1-805-762-11
!
1-805-762-11
!
1-805-762-11
!
1-805-719-12
!
1-805-719-12
!
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