Pioneer CDJ-900 Service Manual page 33

5
No. Cause Diagnostics Point
4 Signal errors SRV Assy
5 Signal errors SRV Assy
6 CD drive
No loading (There is an abnormal noise.)
No. Cause Diagnostics Point
Improper
1 CD drive
assembling
2 Signal errors SRV Assy
[8-2] The stepper does not work.
No. Cause Diagnostics Point
Defective power
1 SRV Assy
supply
2 Signal errors SRV Assy
3 Signal errors SRV Assy
4 Signal errors SRV Assy
5 Defective parts CD drive Assy
[8-3] No CD playback
No. Cause Diagnostics Point
Any foreign
1 CD drive Assy
matter attached
2 Defective pickup SRV Assy
3 - Service mode
[9] EUP Mode
[9-1] Mode shift error in Standby mode
Shifting to EUP mode is not possible.
No. Cause Diagnostics Point
Defective
1 DFLB Assy
PANEL CPU
Disconnection,
breakage, or
2 SRV Assy
loose connection
of cables
Defective SW SW power
3
power supply supply
5
6
Item to be Checked
Check the waveforms of the MUTE1 and
MUTE2 signals. (During loading, the MUTE1
signal is L and the MUTE2 signal is H.)
Check the LOAD signal.
If the symptom persists after the above
corrections,
Item to be Checked
Check if the loading arm has shifted on the
SWs on the SMLB Assy.
Open the bottom plate of the DRIVE UNIT
then check the waveforms on the LPS1 and
LPS2 signal lines.
Item to be Checked
Check the power voltages (V+7R5,
V+5D, V+3D, V+3A, V+1R5 and VHALF).
Check the INSIDE signal. (The INSIDE SW
becomes L when the INSIDE SW is set to
ON.)
Check that the MUTE1 signal becomes H
after loading is completed.
Check that a sine-wave signal is input to
Pins 29 and 30 of DRIVER IC (IC7002).
If the symptom persists after the above
corrections,
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
Check that the signal from Pin 28 of the
PANEL CPU (IC8005) changes from H to
L during mode shift.
Check that the signal from EUP_CONT
(Pin 3 of the CN7301) changes from L to
H during mode shift.
If the symptom persists after the above
corrections,
CDJ-900
6
7
Corrective Action
If the signal waveform is not proper, check the mounting
statuses of the DRIVER IC (IC7002) and SODC
(IC7008) terminals. If they are properly mounted, then
the SODC (IC7008) may be defective. Replace it.
DRIVER IC (IC7002) and SODC (IC7008) may
be improperly soldered or defective.
Resolder them, if necessary. If the symptom persists,
replace SODC (IC7008).
Replace the SRV Assy.
Corrective Action
If the loading arm has shifted on the loading detection
SWs (S8901/S8902), correct the position of the
loading arm. If the soldered SWs are lifted off the
board, resolder them.
The loading detection SWs (S8901 and S8902) 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.
DRIVER IC (IC7002) and SODC (IC7008) may
be improperly soldered or defective.
Resolder them, if necessary. If the symptom persists,
replace SODC (IC7008).
DRIVER IC (IC7002) and SODC (IC7008) may
be improperly soldered or defective.
Resolder them, if necessary. If the symptom persists,
replace SODC (IC7008).
Replace the parts in the order of (1) DRIVER IC
(IC7002), (2) SRV Assy, then (3) traverse mechanism.
Corrective Action
Remove any dirt or dust from the lens.
Refer to the "5.3 Failure Judgment 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 "[10] SERVICE MODE" in this section.
Corrective Action
The PANEL CPU (IC8005) may be defective. Check
the soldering of the PANEL CPU and its periphery.
If the soldering is OK, then replace it.
The signal line cable may be defective.
If it is loosely connected, securely connect it.
If it is broken, replace it.
The SW power-supply is defective. Replace it.
7
8
A
Reference
10.1 SRV
ASSY(1/2)
10.1 SRV ASSY
(1/2)
10.15 WAVE-
4
FORMS
-
B
Reference
-
10.1 SRV ASSY
(1/2)
10.15 WAVE-
2 3
FORMS ,
Reference
C
4.3 POWER SUPPLY
BLOCK DIAGRAM
10.1 SRV
ASSY(1/2)
10.1 SRV
ASSY(1/2)
10.1 SRV ASSY
(1/2)
10.15 WAVE-
9 a
FORMS ,
D
-
Reference
-
5.3 Failure Judgment
of the Pickup Assy
6. Service mode
E
Reference
Refe to "Signal
logic during
EUP mode."
F
-
33
8