4-7
BRC-300/300P
BRU-300/300P
Is
+
12 V output from
pins 6, 7 of Q1503 on
the SY board ?
Are RX and TX
signals received/sent
normally by R1174 and
R1175 respectively on
the SY board ?
No
Yes
SY board failure
(IC1019 or the peripheral
circuit)
Replace the defective
parts or the SY board.
Yes
No
SY board failure
(Q1502, Q1503 or the peripheral
circuit)
Replace the defective parts or the
SY board.
One of the following is defective.
.
R1174, R1175, or the peripheral
circuit
.
FFC between CN1801 (SY board)
and CN802 (CC board)
.
FFC between CN801 (CC board)
and CN2003 (IF-944 board)
Check above in order from the top
to identify the defective part.
FFC: Flexible flat cable
a-5
4-2-2. Image System Troubles
a-5.
Image remains “blueback” at the end of PAN/TILT operations.