Brbk-303 - Sony BRC-300 Service Manual

4-6-3. BRBK-303

g-1. Image is not displayed.
BRBK-303 connection
failure
Connect this unit to
BRC-300/P securely.
The BRC-300/P keeps the STANDBY status.
(The STANDBY lamp keeps lighting.)
MX board failure
(L9006 to L9008, or the
peripheral circuit)
Replace the defective
parts or this unit.
One of the following is
defective.
. Laser unit
SAS-101A
. CN9001 on the MX
board
Replace the SAS-101A
or this unit.
4-32
g-1
Does the unit
correctly function when
another BRBK-303 is
connected to the slot
on the main unit ?
Yes
Does the unit
correctly function when
connected to a normal
BRC-300/P ?
Yes
Does the STANDBY
lamp on the BRC-300/P
POWER switch on the
BRU-300/P is OFF ?
Turn on the POWER
switch of the BRU-300/P,
Does +3.3 V exist in
No pins C4, D4, E4 of
CN9001 and in pins 15,
16 of CN9002 on
the MX board ?
Yes
Are the pin A6 level
of CN9001 on the
No
MX board and the
R004 level on the
EX board set to "L" ?
Yes
Replace this unit when
the BRC-300/P or the
BRU-300/P is normal.
No
No
No
light up while the
Yes
Are the D3-pin level
of CN9001 on the MX
board and the R048
level on the EX board
set to "L" ?
The message "communication error" appears on the
monitor, and the BRC-300/P returns to the STANDBY
status (the STANDBY lamp lights.).
and check the
symptom.
Go to 6
(Next page)
BRC-300/P failure
Go to a-11.
BRU-300/P failure
Go to c-6.
MX board failure
No
(R9001, CN9001, or the
peripheral circuit)
Replace the defective
part or this unit.
Yes
R032
R004
SD-50 BOARD (SIDE A)
R048
BRC-300/300P
BRU-300/300P