Sony CAS-1, Service Manual

Page: 32 / 98

CAS-1
32
4. The protection feature is activated
5. USB memory and so on (USB-A) is not played back.
The protection feature is activated.
Yes
Test point (JL237) on the AMP board is
not “L”.
Yes
Yes
No
The foreign matter is mixed into the
main unit.
The protection feature display is not
appeared, when turning the power on
again without connecting the speaker,
after unplugging the AC adaptor and
discharging enough.
No
Remove the foreign matter from the
main unit, then turn the power on
again, and check whether the
protection feature display is not
appeared.
Yes
Yes
Yes
Replace the IC204 on the AMP
board and parts of area surrounding
circuit.
No
Yes
Yes
Yes
Replace the temperature sensor
(TH002) on the AMP board and
parts of area surrounding circuit.
No
Transistor (Q211) on the AMP board is
heating abnormally.
Replace the IC204 on the AMP
board and parts of area surrounding
circuit.
No
End
(There is a possibility that speaker
wire have been short-circuited)
Replace the transistor (Q211) on the
AMP board and parts of area
surrounding circuit of combination power.
The protection feature display is not
appeared, when turning the power on
after connecting the speaker again.
USB memory and so on (USB-A) is
not played back.
Yes
USB-A function LED is changed from the
flashing to the lighting when inserting the
USB memory and so on.
Yes
End (It is problem of USB memory
and so on)
It is played back when replacing the
USB memory and so on.
No
Yes
Yes
Replace the IC900 on the MAIN
board.
No
Yes
The voltage of the following is +5 V.
MAIN board: IC901 pin 2, 3
Yes
Replace the IC901 on the MAIN
board.
No
The voltage of the following is +5 V.
MAIN board: CN902 pin 4
Replace the complete NETWORK
board.
No No
The voltage of the following is +5 V.
AMP board: IC002 pin 8
Yes
Replace the parts of area
surrounding circuit of IC002 on the
AMP board.
Yes