Sony BRC-300 Service Manual page 122

a-9. No operation is available with RS-232C/RS-422 interface.
Operations are disabled with RS-232C.
Properly connect the
cable between the device
and the unit.
4-12
system and baud rate
Check the symptom.
Do communication
No
signals exist in the
VISCA RS-232C
IN/OUT connector ?
Yes
One of the following is defective.
. FFC between SW board and
CC board
. IC601 to IC606, IC609, or the
peripheral circuit on the CC board
Check above in order from the
top to identify the defective part.
a-9
Are transmission
No
of the unit set
correctly ?
Yes
Operations are disabled with RS-422.
Do communication
signals exist in the
VISCA RS-422C
connector ?
One of the following is defective.
. FFC between SW board and CC
board
. IC601 to IC605, IC607 to IC609,
or the peripheral circuit on the
CC board
Check above in order from the top
to identify the defective part.
FFC: Flexible flat cable
Correctly set the
transmission system
(RS-232C/RS-422) and
baud rate (38400/9600),
and reboot the system.
No
Properly connect the
cable between the device
and the unit.
Yes
BRC-300/300P
BRU-300/300P