2. Troubleshooting flow chart for “No disc reading”is shown in the following figure 3.3.2.2: (the
symptom of no disc reading of this player is that the disc door opens automatically, before
troubleshooting, judge whether loader is good, if loader structure is good, check according to the
following flow chart)
No disc reading
Whether loader resets
Whether
pin 26 of D5954
has feed signal
input
Check MT1389 and filtering
capacitor
Check
whether voltage
of two ends o f electric
machine is equal
Check electric machine
Check D5954
Whether
there is focus acts
Whether
pin 1 of D5954
has focus signal
input
Check MT1389 and
filtering capacitor
Check
whether voltage
of pin 13, 14 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 and
filtering capacitor
Check
whether voltage
of pin 11, 12 of D5954
is normal
Check D5954
Check electric machine
Whether
laser head emits light
Check
whether APC
circuit supplies voltage
for laser head
Check
whether LDO_DV33
is normal
Check power supply circuit
Change loader
A1
A2
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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