3-12
ELECTRICAL TROUBLESHOOTING GUIDE
Function transformation
to OPT
Function transformation
to PORT Insert AUDIO line
Replace the JK502(OPT)
Check if IC400 pin13, 14
Is there a signal input?
Check if IC400 pin3, 4
voltage is ok(3.3 V, 5 V)?
Check if IC400 pin6~9
(MCLK, LRCK, DATA, BCK)
Replace the IC400
Check if CON502 is ok?
Replace the JK504
Check the POWER PART.
Check the OPT line,
Changing the OPT Equipment
Check if JK504 det.pin
voltage is ok(0 V)?
Does it output
audio?
Does it output
audio?
Check if JK502
voltage is ok(3.3 V)?
NO
NO
NO
NO
NO
NO
NO
Check the OPT
the input signal
Check if MCL3730
pin4 “H”
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
B
TEST END.
Summary of Contents for LAS350B
Page 9: ...2 2 ...
Page 11: ...A900 2 SUBWOOFER SECTION ...
Page 13: ...2 8 ...
Page 28: ...3 15 2 FLASH MEMORY FIG 2 VCC CS CLK DO 3 4 5 6 VCC CS CLK DO 5 6 4 3 ...
Page 30: ...3 17 4 USB FIG 4 1 USB_5V 11 FIG 4 2 USB D 12 FIG 4 3 USB D 13 11 EC405 100uF 16V C475 12 13 ...
Page 32: ...3 19 6 OPTICAL FIG 6 1 OPT_IN 17 FIG 6 2 OPT_DET 18 17 18 ...
Page 37: ...3 24 ...
Page 47: ...3 44 3 43 2 MAIN P C BOARD DIAGRAM TOP VIEW BOTTOM VIEW ...
Page 49: ...3 48 3 47 ...
