The Laser Does Not Light Up; Out Of Focus; Hf Is Abnormal; Track Search Is Impossible - Denon D-A03 Service Manual

The laser does not light up

Is 1.5V applied to the LDO terminal of pin 7 of IC146 ?
Yes
Is +1.8V applied to the collector of TR101 ?
Yes
Is +1.8V applied to pin 10 of CX151 ?
Yes
The optical pickup is defective if CX151 is normal.

Out of focus

Does the pickup lens go up and down when removing the
disc ?
Yes
Is the waveform inputted at pin 15 on IC146 when loading a
disc ? <Refer to the waveform diagrams on page 31.>
Yes
IC146 is defective.

HF is abnormal

Is the output (tracking error signal) found at pin 4 and 5 on
IC145 in the CD test mode 3 ?
Normal
Is tracking input found at pin 11 of IC146 ?
<Refer to the waveform diagrams on page 31.>
Yes
Is the tracking output found at pin 34 in IC149 in the CD test
mode 4 ?
Yes
Is there the output between pin 5 and 6 on IC145 ?
Yes
Check the portion between IC145 and CX151 and connection of the optical pickup wires. If OK, the optical pickup is defective.

Track search is impossible

Does the sled motor run by pressing the
the test mode ?
Yes
Is the waveform outputted to pin 11 and 17 on IC146 when a
track is jumped ?
<Refer to the waveform diagrams on page 31.>
Yes
Is the waveform output found at pin 34 and 40 on IC149 when
a track is jumped ?
<Refer to the waveform diagrams on page 32.>
Yes
Is the slide output found at pin 25 and 26 on IC145, and the
tracking output at pin 5 and 6 ?
Yes
Check the portion between IC145 and CX151 and connection of the optical pickup wires. If OK, the optical pickup is defective.
Check the portion between IC145 and CX062, sires and periphery of the sled spin motor. If OK, the motor is defective.
No
IC146 is defective
No
Is +3.3V applied to C109 of R108 ?
Check the +3.3V stabilization circuit of IC145 and L103.
No
The PWB pattern has been cut between TR101 and pin 10
of CX151.
No
Refer to "The triangular wave for focus servo does not
appear".
No
Check the optical pickup wires. If OK, the optical pickup is
defective.
Abnormal
Check between IC145 and CX151. If OK, the optical pickup
is defective.
No
Check the parts around IC146. If OK, IC146 is defective.
No
Check the parts around IC149. If OK, IC149 is defective.
No
Check the parts around IC145. If OK, IC145 is defective.
No
/ button in Refer to "The sled motor does not run".
No
IC146 is defective.
No
IC149 is defective.
No
If the parts around IC145 are normal, IC145 is defective.
No
R108 is defective.
Yes
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