Not read disc
Whether
pick-up resets
Whether
pin 26 of D5954
has feed signal input
Check MT1389 and
filtering capacitor
Check
whether voltage
on two ends of electric
machine is equal
Check electric machine
Check D5954
Whether
there is focus
action
Whether
pin 1 of D5954
has focus signal
input
Check MT1389 pin
filtering capacitor
Check
whether pin 13, 14
voltage of D5954 is
normal
Check
whether pin 11, 12
voltage of D5954 is
normal
Check the line from
pin 1, 2 of XS301 to coil
Check D5954
Whether
main axis electric
machine rotates
Whether
pin 5 of D5954 has
signal input
Check MT1389 pin filtering
capacitor
Whether D5954
Check electric machine
Whether
pick-up emits light
Check
whether APC
circuit supplies voltage
for pick-up
Check
whether LDO_DV33
is normal
Check power supply circuit
2. Troubleshooting process for “Not read disc” is shown in the figure 3.3.2.2:
Trouble description: switch machine in DVD state, load disc and machine displays that there is no
disc or cannot read disc for a long time.
Change loader
B1
B2
Y
N
N
N
Y
Y
Y
N
N
N
Y
Y
Y
Y
N
N
N
Y
Y
Y
Y
N
N
N
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