Pioneer CDJ-900 Service Manual page 35

5
No. Cause Diagnostics Point
Defective power
4 SRV Assy
supply
5 Defective parts -
In-focus not possible
No. Cause Diagnostics Point
1 Defective pickup SRV Assy
Defective power
2 SRV Assy
supply
3 Signal errors SRV Assy
Traverse
4 Signal errors
mechanism
5 Signal errors SRV Assy
6 Signal errors SRV Assy
7 Signal errors SRV Assy
8 Defective parts SRV Assy
No tracking close
No. Cause Diagnostics Point
Traverse
1 -
mechanism
2 Signal errors SRV Assy
3 Signal errors SRV Assy
4 Signal errors SRV Assy
5 Defective parts SRV Assy
5
6
Item to be Checked
Check the power voltages (V+5A, VREF1,
VREF2 and VHALF).
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+7R5, V+5D,
V+3D, V+3A, V+1R5 and VHALF).
Check that the MUTE1 signal becomes H
after loading is completed.
Check that the spindle motor is rotating at a
speed of 2,000 rpm. (A rotation speed of
2,000 rpm is required for focusing in.)
Check that 18 pulses are generated per
rotation in the SPDLFG signal.
Check the FE signal.
(Check that an S-shaped signal is output
when a waveform of the FEDRV
signal is rising after it drops down from
1.65 V.)
Check that the FEDRV signal fluctuates
with 1.65 V at the center.
If the symptom persists after the above
corrections,
Item to be Checked
Check that focusing is in. (If focusing is out,
tracking close is not possible.)
Check that the E and F signals fluctuate
with 2.2 V at the center.
Check that the TE signal fluctuates
with 1.65 V at the center.
Check that the TEDRV signal fluctuates
with 1.65 V at the center, and that a pulse-
like signal is output during tracking close.
If the symptom persists after the above
corrections,
CDJ-900
6
7
Corrective Action
If V+5A is not output, 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. Replace them.
Other voltages (VREF1, VREF2, and VHALF) are produced
at the FEP (IC7004). If these voltages are not output, check
the mounting status of the FEP. If it is properly mounted,
then the part may be defective. Replace it.
The DRIVER IC (IC7002) is defective. Replace it.
Corrective Action
Refer to the "5.3 Failure Judgment of the Pickup
Assy."
For any power-supply section that does not output the
voltage, check the mounting statuses of the regulator IC
and its peripheral parts. If they are properly mounted,
then the parts may be defective. Replace them.
DRIVER IC (IC7002) and SODC (IC7008) may
be improperly soldered or defective.
Resolder them, if necessary. If the symptom persists,
replace SODC (IC7008).
If it does not rotate, see [The spindle motor does
not rotate.] in this section.
If the signal is output, check the mounting status of the
FEP (IC7004) terminal. If it is properly mounted, then
the part may be defective. Replace it.
If the signal is not output, check the mounting status of
the SODC (IC7008) terminal. If it is properly mounted,
then the part may be defective. Replace it.
If the output waveform is proper, check the mounting
status of the SODC (IC7008) terminal. If it is properly
mounted, then go to [7].
If the output waveform is not proper, check the mounting
status of the FEP (IC7004) terminal. If it is properly
mounted, then the part may be defective. Replace it.
If the output waveform is proper, check the mounting
status of the DRIVER IC (IC7002) terminal.
If it is properly mounted, then the part may be defective.
Replace it.
If the output waveform is not proper, check the mounting
status of the SODC (IC7008) terminal. If it is properly
mounted, then the part may be defective. Replace it.
Replace the parts in the order of
(1) FEP (IC7004), (2) SODC (IC7008),
(3) DRIVER IC (IC7002), (4) SRV Assy,
then (5) traverse mechanism.
Corrective Action
See "In-focus not possible" above.
If no signal is output, check the mounting status of the
CN7001 connector. If soldering is improper, resolder it.
If the symptom persists after this correction, replace the
traverse mechanism.
If the output waveform is proper, check the mounting
status of the SODC (IC7008) terminal. If it is properly
mounted, then go to [4].
If the output waveform is not proper, check the mounting
status of the FEP (IC7004) terminal. If it is properly
mounted, then the part may be defective. Replace it.
If the output waveform is proper, check the mounting
status of the SODC (IC7008) terminal. If it is properly
mounted, then the part may be defective. Replace it.
If the output waveform is not proper, check the mounting
status of the DRIVER IC (IC7002) terminal. If it is properly
mounted, then the part may be defective. Replace it.
Replace the parts in the order of (1) FEP (IC7004),
(2) SODC (IC7008), (3) DRIVER IC (IC7002),
(4) SRV Assy, then (5) traverse mechanism.
7
8
A
Reference
4.3 POWER SUPPLY
BLOCK DIAGRAM
-
Reference
B
5.3 Failure Judgment
of the Pickup ASSY
4.3 POWER SUPPLY
BLOCK DIAGRAM
10.1 SRV
ASSY(1/2)
-
C
10.1 SRV
ASSY(1/2)
10.15
WAVEFORMS
d
10.1 SRV
ASSY(1/2)
10.15
WAVEFORMS
5
10.1 SRV
ASSY(1/2)
D
10.15
WAVEFORMS
6
-
Reference
-
10.1 SRV
ASSY(1/2)
E
10.15 WAVE-
e f
FORMS ,
10.1 SRV
ASSY(1/2)
10.15
WAVEFORMS
7
10.1 SRV
ASSY(1/2)
10.15
WAVEFORMS
b
F
-
35
8