Sony BRC-300, Руководство по обслуживанию

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