Sony RB1G Service Manual page 47

Troubleshooting
3-2-2. LED BLINKING 3x (Audio Error) – BA2 and BM board only (not applicable for this model)
#2
F4601,IC4601,etc
(B* Board)
High
Check 12.5V
enough
( at F4601) to GND
impedance
Low impedance
IC4601
burn or broken ?
Yes
Replace IC4601
Replace F4601
No
Check broken parts
around IC4601
#3
IC4601,etc
(B* Board)
Check the IC4601
Check the IC4601
Out pin 9, 16, 25, 32
No
pin 18 (at CL4606)
Switching 0V to 12V
around 300-400kHz
Yes
IC4601 or parts around IC4601 NG
Check the CN4601
No
DC level ~2V (at
JL4621~JL4624)
Yes
Check the IC4601
NG
I2S line pin 5, 6, 7, 8
(at CL4601~CL4604)
OK
IC4601 NG
W600A/ W603A/ W605A/ W607A/ W650A/ W651A/ W653A/
W654A/ W655A/ W656A/W657A/ W658A/ W670A/ W674A
No
is HIGH?
Yes
Solder NG
L4601-L4604
or
C4611-C4614
NG
IC9000 NG
Note:
(AYU2) – IC9000
(Brownie)- IC9001
RB1G CHASSIS
47