Sony BRC-300 Service Manual page 130

c-4. The power indicator lights, but the video output sync is abnormal.
Remove the noise from
the EXT SYNC IN
connector, or connect
nothing to it.
Then check again.
If normal, check the
input system again.
4-20
Internal sync
No
Is the EXT SYNC IN
connector normal ?
(No noise)
Yes
MC board failure
(IC3001, IC3002, IC3009,
or the peripheral circuit)
Replace the defective
parts or the MC board.
c-4
External sync
Check the sync setting
of this unit.
Is the input sync
signal according to the
system of this unit ?
(NTSC/PAL)
Input the sync signal
No
according to the
system of this unit
(NTSC/PAL).
Yes
BRC-300/300P
BRU-300/300P