BBK DV718SI - Page 47

6. Troubleshooting process for “Not read disc” is shown in the figure 3.2.2.6:
Not read disc
Check
whether loader has
reset when no
disc in
Whether
pin 26 of AM5888S
has feed signal
input
Check whether disc in/feed to
proper position detect circuit
and MT1389 are normal
N
N
Y
Y
Check
whether pin 17/18
voltage of AM5888S
is normal
Check AM5888S
N
Y
Check line and elements
between AM5888S and feed
electric machine
Observe
whether object lens
has up/down focus
action
N
Whether
pin 1 of AM5888S
has focus signal
input
N
Check Mt1389 and R204,
C213 are normal
Y
Check
whether pin 13, 14
voltage of AM5888S is
normal
Y
Check whether pin 1, 2 voltage
of XS301 is normal
N
Change AM5888S
Whether
main axis electric
machine rotates
N
Whether
pin 4 of AM5888S
has signal input
N
Check whetherMT1389 and
R201, C210 are normal
Y
Check
whether pin 11, 12
voltage of AM5888S is
normal
Y
Check electric machine
N
Check AM5888S
Y
Whether
laser head emits light
N
Check
whether APC
circuit supplies voltage
for laser head
N
Check whether MT1389 and
R201, C210 are normal
Y
Y
Check
whether LDO_DV33 is
normal
N
Change loader
Y
A1
Y
A2
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