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SD-AT100H
The [No Disc] indication. (In case focus servo does not function.)
Is the focus control signal output to the pin 14 of
IC3701?
Is the focus control signal from the pin 158 of
IC3701 input into the pin 23 of IC3801 ?
Is the focus control drive voltage output from the
pins 17 and 18 of IC3801 ?
Focus control drive voltage applied to 47, 49 pin
of CS3301 (focus actuator terminal) ?
Check the connection of optical pickup cable.
If it is normal, replace the optical pickup
mechanism Unit.
The DVD disc is not recognized.
(When the laser beam does not go on)
Is the drive signal (FLGA) of Q3301 (HF- MOD SW)
being output to the pin 37 of IC3701?
Is the drive signal (LDO2) of Q3302 (LD POWER
CTL) being output to the pin 4 of IC3301 ?
Is the voltage of 3.3 V being applied to the emitter
of Q3301? And, is the voltage of 3.4 V being
applied to the emitter of Q3302 ?
Is the voltage of 3.1V and 2.3V being applied to
the pins 34 and 43 of CS3301, respectively?
Check the connection of optical pickup cable.
If it is normal, replace the optical pickup
mechanism Unit.
The CD disc is not recognized.
(When the laser beam does not go on)
Is the voltage of 3.4V being applied to the emitter
of Q3303 ?
Is the voltage of 2.3V being applied to the pin 29
of CS3301 ?
Check the connection of optical pickup cable.
If it is normal, replace the optical pickup
mechanism Unit.
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Check the IC3701 DAC power source periphery
circuit. If it is normal, replace IC3701.
No
Check the focus control signal (FOD) line between
the IC3801 and IC3701.
Check M_5 V line.
No
Is 8V voltage applied to the pins 8 of IC3801?
No
Check the line between the IC3701 and the focus
actuator terminal.
No
Check the line from the pin 37 of IC3701, to the
base of Q3301.
No
Check the line between the pin 45 of IC3301 and
the base of Q3302.
No
Check the D_3.1 V line and A_5 V line.
No
Check the Q3301 and line between Q3302 and
CS3301.
No
Check the A_5 V line.
No
Check the line between Q3303 and CS3301.
– 100 –
No
Yes
Replace IC3801.
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