4-33
BRC-300/300P
BRU-300/300P
MX board failure
(IC9010, C9064 to C9067,
L9009, L9010, or the
peripheral circuit)
Replace the defective part
or this unit.
6
Does
+
3.3 V exist in
L9003 and
+
2.5 V exist
in L9004 on the
MX board ?
Is the 54 MHz
clock output from
pin 41 of IC9010
on the MX board ?
No
MX board failure
(IC9003, IC9004, Q9001 to
Q9004, or the peripheral
circuit)
Replace the defective part
or this unit.
No
Yes
One of the following is
defective.
.
IC9002, C9017, R9010,
R9011, R9053, or the
peripheral circuit on the
MX board
.
CN9001 on the MX board
Replace the defective part
or this unit.
Are the 27 MHz
clock output from
pin 9 of IC9002 on
the MX board and
from R032 on the
EX board ?
No
Yes
Yes
Is the 54 MHz
clock input to pin 2
of IC9001 and to pin 8
of IC9010 on the
MX board ?
No
Yes
One of the following is
defective.
.
IC9001, R9052, or the
peripheral circuit on the
MX board
.
CN9001 on the MX board
Replace the defective part
or this unit.
Is the pin 20 level of
IC9010 set to “H”
on the MX board ?
Yes
No
Is the signal input
to pin 9 of IC9009,
and are the pins 2, 3
levels set to “H” on
the MX board ?
Yes
No
One of the following is
defective.
.
IC9009 or the peripheral
circuit on the MX board
.
CN9001 on the MX board
Replace the defective part
or this unit.
MX board failure
(IC9010 or the peripheral
circuit)
Replace the defective part or
this unit.
One of the following is
defective.
.
IC9009 and IC9010 on the
MX board
.
Pattern disconnection
between pin 13 of IC9009
and pin 20 of IC9010 on
theMX board.
Replace the defective part
or this unit.
