4-2
BRC-300/300P
BRU-300/300P
Is the AC adapter
connected, and is
AC power (
+
12 V)
supplied?
Does
+
3.3 V exist
in pin 4 of IC1501
on the SY board ?
Yes
Are the fuses F1501
to F1504 normal on the
SY board ?
One of the following is
defective.
.
DC IN jack
.
Harness between DC
board and SY board
.
DC board
Check above in order from
the top to identify the
defective part.
No
Yes
SY board failure
(IC1019 or the peripheral
circuit)
Replace the defective
parts or the SY board.
No
SY board failure
(IC1501 or the peripheral
circuit)
Replace the defective parts
or the SY board.
Yes
Connect the AC adapter,
and supply AC power.
Check whether
+
12 V is
output from the adapter’s
DC IN jack. Replace the
AC adapter if necessary.
Does
+
12 V exist in
pins 1 to 4 on the
SY board ?
Yes
No
No
Is the pin 107
level of IC1019
set to “H” on the
SY board ?
No
Yes
Replace the fuses F1501
to F1504 on the SY board,
and check the power
supply system.
SY board failure
(X1001 or the peripheral
circuit)
Replace the defective parts
or the SY board.
Is the 25 MHz
signal input to pins
96, 97 of IC1019
on the SY board ?
Yes
SY board failure
(IC1502 or the peripheral
circuit)
Replace the defective parts
or the SY board.
No
a-1
4-2. BRC-300/300P
4-2-1. Troubles during Power-on Process of the Unit
a-1.
The power indicator does not light and pan/tilt operations are disabled.
