Pioneer CDJ-850 Service Manual page 29

5
[8] SERVICE MODE
[8-1] 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
TM Assy-S
Any foreign
3
(Traverse mecha)
matter attached
Improper
TM Assy-S
4
assembly (Traverse mecha)
Improper
5 Slotin Mecha
assembly
Any foreign
TM Assy-S
6
matter attached
(Traverse mecha)
Any foreign
7 Slotin Mecha
matter attached
8 Signal errors MAIN Assy
TM Assy-S
9 Defective pickup
(Traverse mecha)
[8-2] The drive does not work during Test Operation mode.
The LD does not emit light.
No. Cause Diagnostics Point
—
1 Defective pickup
The spindle motor does not rotate.
No. Cause Diagnostics Point
1 Signal errors MAIN Assy
2 Signal errors MAIN Assy
3 Power failure MAIN Assy
4 Defective parts —
In-focus not possible
No. Cause Diagnostics Point
1 Defective pickup MAIN Assy
2 Power failure MAIN Assy
5
6
Item to be Checked
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.
Check if any foreign matter, such as
shavings, dirt, or dust, is attached to the
lens of the Pickup Assy.
Check that the TM Assy-S (traverse mecha)
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 clamper.
Check that the waveforms of the RFO and
AGCRF signals form clear eye patterns.
If the symptom persists after the above
corrections,
Item to be Checked
Check the LD current and measure the
resistance value of the actuator.
Item to be Checked
Check that the DRVMUTE1 and 2 signal
becomes H after loading is completed.
Check a SPIN signal.
In the normal, 1.65 V at the center.
The voltage in the start-up acceleration is
around 3 V.
Check the power voltages.
(V+7R6_M, V+5R6_M, VREF1R65,
V+3R3_S)
If the symptom persists after the above
corrections,
Item to be Checked
Check the LD current and measure the
resistance value of the actuator.
Check the power voltages.
(V+7R6_M, V+5R6_M, VREF1R65,
V+3R3_S)
CDJ-850
6
7
Corrective Action
If it is clearly dirty, replace it with a disc of good
condition.
If the error rate measured in a different area is OK,
the disc is defective. Replace the disc 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.
Corrective Action
See "5.3 Diagnosis of the Pickup Assy" for details.
Corrective Action
If the signal is not normal, check the mounting
statuses of the DRIVER IC (IC204) and MAIN CPU
(IC103) terminals. If they are properly mounted, then
the IC103 may be defective.
If the signal is not normal, check the mounting
statuses of the DRIVER IC (IC204) and Servo CPU
(IC201) terminals. If they are properly mounted, then
the IC204 and IC201 may be defective.
Check the mounting statuses of the regulator IC of
the power-supply section that produces that voltage
and its peripheral parts. If they are properly mounted,
then the parts may be defective.
VREF1R65 is produced at the Servo IC (IC201).
If this voltage is not output, check the mounting
status of the IC201. If it is properly mounted, then the
part may be defective.
DRIVER IC(IC204) may be defective.
Corrective Action
Refer to the "5.3 Diagnosis of the Pickup Assy."
Check the mounting statuses of the regulator IC of
the power-supply section that produces that voltage
and its peripheral parts. If they are properly mounted,
then the parts may be defective.
VREF1R65 is produced at the Servo IC (IC201).
If this voltage is not output, check the mounting
status of the IC201. If it is properly mounted, then the
part may be defective.
7
8
A
Reference
—
—
—
B
—
—
—
—
10.14
WAVEFORMS
13 14
C
5.3 Diagnosis of
the Pickup Assy
Reference
5.3 Diagnosis of
the Pickup Assy
Reference
D
10.15 EACH
SIGNAL LEVEL
S
10.15 EACH
SIGNAL LEVEL
T
4.3 POWER SUPPLY
BLOCK DIAGRAM
E
—
Reference
5.3 Diagnosis of
the Pickup Assy
4.3 POWER SUPPLY
BLOCK DIAGRAM
F
29
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