Sony UBP-X800 Service Manual page 51

6-2. Power (System) Flow
AC IN
Check the output voltages from the power
supply block.
CN401 pin 1: +12V (UNSW12V)
CN401 pin 4: +12V (FE_UNSW12V)
Yes
Check the fuses
Have any of the below fuses blown?
MB board: PS401, PS402
No
Check the following power control
signals while the power is ON
PCONT1# : MB board R513
PCONT2# : MB board R560
PCONT3# : MB board R564
PCONT5# : MB board R575
Is PCONT1# /2# /3# /5# : 3.3V?
Yes
Check Voltage lines that are not output
are shorted to GND
Yes
Replace MB Board
Check that the harness has been inserted
No
properly. If there is no problem, replace the
power supply block.
Blown fuse s ->
Yes
Replace the MB board
No
Failure of Reset IC. Replace MB Board.
Failure of power supply IC ->
No
Replace the MB board .
6-2