Sony BDP-BX1 Service Manual page 106

FL/FR F low (2/3)
FLD does n ot l ight
IIs there ofabout 3,3V PS701 ?
voltage
at
Yes
Is there voltage of about -22V at JL701 ?
Yes
Is there voltage of 3,3V at pin 43 of IC702?
Yes
Is pin 5 of IC702 oscillating?
Yes
Is there input of pulse to pins 7, 8 and 9 of
C702?
Yes
Check connection of FLD and IC100.
Replace IC100 if OK.
If no effect, replace the FL board,
t-N-Q-- ITo
F LD Switch Check
Surrounding
Check the circuits surrounging the FLD DC-
DC CONVERTER,
f NG, then rep ace FL board.
--9-_ Check the 3,3V line of FR board.
_Q.___lReplace IC702. If no effect, replace FL
Iboard.
.9.___.lReplace FFC between FR and IFD. If no
leffect, then qoto IFD Board Flow
]
]
]
1
FLD Switch Surrounding Check
ls the potential of pin 3 of Q704 5.8V?
Yes
Is the potential of the base of Q704 around
5V?
S Yes
Replace Q704
-_-9_ Check the 5.8V line of FR board.
No
£--_. Is the collector voltage of Q703 about 0V?
,Yes
Replace Q704
]
--_--£_ Is the voltage of the base of Q703 at 3,3V?
Yes
J [Replace Q703
._ls pin 7 of CN701 at 3,3V?
Yes
J [Replace FR board
1
1
,-?
X
t_
0