BBK DK1410SI - Page 61

Change loader
and check whether it is
normal
OK
Check
whether power
supply of pin 8 and 7 of
U302 (D5954)
is 5V
Check
whether pin 4
of U302 (D5954) is
1.4V
Check power supply circuit
Check
whether power
supply and clock (27MHZ)
of MT1389 are
normal
1. Check power supply circuit if
power supply is abnormal
2. Check clock circuit whether
clock is abnormal
Check
whether power
supply and clock of MT1389
are normal (refer to trouble
shooting process
of MT1389)
Change MT1389
Whether
laser head and
feed are normal (whether laser
head moves forward and
backward after power
on)
Use
digital oscillograph
to test whether the end close
to MT1389 of R202
has waveform
Check
whether C211 has
electric leakage or
short circuit
Change MT1389
Whether
laser head
focus is normal (objective
lens will move upward
and downward
after power
on)
Use
oscillograph to
test whether the end
close to MT1389 of R204
has waveform
Check
whether C213
has electric leakage or
short circuit to
ground
Check
whether feed
signal path between
MT1389 and D5954
is normal
Change
Change the corresponding element
Change
Check
whether the
focus signal path between
MT1389 and U301
(D5954) is
normal
Whether it
normal after changing
U301 (D5954)
OK
Change
U301 (D5954)
and check whether It
is normal
OK
Change the corresponding
element
Change MT1389
Check other circuit
Whether
laser head has laser
emission
Check
whether laser
power control circuit is
normal
Change the corresponding element
Whether main
axis has rotation
Check
whether the
end close to MT1389 of
MD has trace signal and
check
waveform
Check
whether trace
signal path between MT1389
and U301 is
normal
Change
U301 (D5954)
and check whether it
is normal
1.change MT1389
2. Check other peripherical circuit
Check
whether C213
has electric leakage or
short circuit
1. Change MT1389
2. Check other circuit
Change
Change the corresponding element
Change MT1389
N
Y
N
Y
Y
Y
Y
N
N
Y
N
N
N
Y
Y
Y
Y
N
Y
Y
Y
Y
Y
Y
N
N
N
N
Y
N
N
Y
Y
Y
NN
N
N
N
Y
N
Note
Note
Note
Check
whether the
end close to MT1389
of R201 has
pulse
Check
whether C210
has short circuit or
electric leakage
Change
Check
whether main
axis braking circuit is
normal
Check
whether main
axis control circuit between
MT1389 and U301
is normal
Change
U301 (D5954)
and check whether it is
normal
OK
1. Change MT1389
2. Check other circuit
Y
Y
Y
N
Y
N
Y
N
N
Note
1. Change MT1389
2. Check other circuit
N
20. Troubleshooting process for no disc reading is shown as the following figure 3.3.2.21:
Note , , and are tested when no disc in, disc in and laser head performs default focus and feed acts.
No disc reading
Check whether the place of
XS301, XS303, XS302 is well
inserted or oxidated
Change MT1389
OK
Figure 3.3.2.21 Troubleshooting flow chart for no disc reading
Change MT1389
- 57 -