Sony BRC-300 Service Manual page 137

No VBS or Y/C image is output.
When the BRC-300/P or
the BRU-300/P is
normal, replace this unit.
AN board failure
(Pattern disconnection
of the 27 MHz CLK
signal)
Replace this unit.
BRC-300/300P
BRU-300/300P
Is the clock
No
input to pin C25 of
CN7001 on the
AN board ?
Yes
Is the clock input
No
to pin 46 of IC7022
on the AN board ?
Yes
AN board failure
(IC7022 or the peripheral
circuit)
Replace the defective
parts or this unit.
4
No RGB/YCbCr image is output.
Check the symptom.
Is the clock
input to pins A25, D24
of CN7001 on the
AN board ?
Are signals output
from Pins 5, 6 of IC7005
and from pin 4 of IC7007
on the AN board ?
Are the 6.75 and
13.5 MHz clock input
to the necessary ICs
on the AN board ?
AN board failure
Check the ICs on the 6.75
and 13.5 MHz clock lines
to replace the defective
parts or this unit.
No
When the BRC-300/P
or the BRU-300/P is
normal, replace this unit.
Yes
AN board failure
No
(IC7005, IC7007, or the
peripheral circuit)
Replace the defective
parts or this unit.
Yes
AN board failure
No
(Pattern disconnection
of 6.75 or 13.5 MHz
clock)
Replace this unit.
Yes
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