Pioneer CDJ-350 Service Manual page 25

5
No loading (There is an abnormal noise.)
No. Cause Diagnostics Point
Improper SLOTIN
1
assembling MECHA Assy
2 Signal errors MAIN Assy
[6-2] The stepper does not work.
No. Cause Diagnostics Point
1 Power failure MAIN Assy
2 Signal errors MAIN Assy
[6-3] No CD playback
No. Cause Diagnostics Point
Any foreign
1 CD drive Assy
matter attached
2 Defective pickup MAIN Assy
3 — Service mode
[7] SERVICE MODE
[7-1] The measured error rate is outside the specified range in Player Operation mode.
No. Cause Diagnostics Point
Scratches or
1 DISC
dirt on the disc
Scratches or
2 DISC
dirt on the disc
Any foreign Traverse
3
matter attached mechanism
Improper Traverse
4
assembly mechanism
Improper Traverse
5
assembly mechanism
Any foreign Traverse
6
matter attached mechanism
Any foreign Traverse
7
matter attached mechanism
8 Signal errors MAIN Assy
Traverse
9 Defective pickup
mechanism
5
6
Item to be Checked
Check if the SW lever has shifted on the
SWs on the SMLB Assy.
Check the waveforms on the LPS1 and
LPS2 signal lines.
Item to be Checked
Check the power voltages.
(V+7R6M, V+5R6M, VREF1R65, V+3R3B,
V+3R3, V+1R2A)
Check the INSIDE signal. (The INSIDE SW
becomes "L" when the INSIDE SW is set to
ON.)
Item to be Checked
Check if the objective lens is dirty.
Check the LD current value.
Measure the actuator resistance value.
If the symptom persists after the above
corrections, check operations of the CD
drive in Service mode.
Item to be Checked
First, whether the cause is attributable to the
disc or to the player must be distinguished.
Check if the recording surface of the disc is
dirty.
Measure the error rate, using the same disc
that produced the bad error rate but using
the addresses in a different area. If the error
rate measured in a different area is OK, the
CD is defective.
Check if any foreign matter, such as
shavings, dirt, or dust, is attached to the
lens of the Pickup Assy.
Check that the traverse mechanism has
been securely installed.
Check that the loading mechanism Assy
has been securely installed.
Check for any foreign matter on the spindle
table.
Check if any foreign matter is attached to
the magnet portion of the Pickup Assy.
Check that the waveforms of the RFO and
AGCRF signals form clear eye patterns.
If the symptom persists after the above
corrections,
CDJ-350
6
7
Corrective Action
If the SW lever has shifted on the loading detection
SWs (S751/S752), correct the position of the SW
lever. If the soldered SWs are lifted off the board,
resolder them.
If the signal waveform is not proper, the loading
detection SWs (S751 and S752) may be improperly
soldered or defective. Resolder them, if necessary.
If the symptom persists, replace them.
Corrective Action
Check the connection of the parts at the periphery of
the regulator IC that does not output the voltage.
If the symptom persists after a corrective action, the
power supply block is defective. Replace it.
If the signal is not proper, check the connections.
If connections are properly made, replace the
traverse mechanism.
Corrective Action
Remove any dirt or dust from the lens.
Refer to the "5.3 Diagnosis of the Pickup Assy."
Check operations of the CD drive, referring to the
procedures described in "6. SERVICE MODE."
If the CD drive functions improperly,
see "[7] SERVICE MODE" in this section.
Corrective Action
If it is clearly dirty, replace it with a CD of good
condition.
If the error rate measured in a different area is OK,
the CD is defective. Replace the CD with one in good
condition.
If no error rate measured in various areas throughout
the entire surface of the CD is OK, go to [3].
Clean the lens.
If it has not, reinstall it properly.
If it has not, reinstall it properly.
Remove any foreign matter.
Remove any foreign matter.
If their waveforms are not of the same quality, check
the mounting status of the Servo IC (IC201).
If it is correctly mounted, then it may be defective.
Replace it.
See "5.3 Diagnosisi of the Pickup Assy" for details.
7
8
A
Reference
—
—
B
Reference
4.3 POWER SUPPLY
BLOCK DIAGRAM
—
Reference
—
C
5.3 Diagnosis of
the Pickup Assy
6. Service mode
Reference
D
—
—
—
—
—
E
—
—
10.11
WAVEFORMS
d e
MAIN ,
5.3 Diagnosis of
the Pickup Assy
F
25
8