Troubleshooting - Pioneer CDJ-900 Service Manual

1

5.2 TROUBLESHOOTING

A
In this section, causes of failure, diagnostics points, and corrective measures can be searched for according to symptoms.
Before disassembling this unit, it is recommended to infer a failure point by performing a auto device check/alarm port and
referring to the error code.
Note: Alarm port is the Test port on the MAIN Assy.
(Location is referred to the Schematic diagram and PCB Connection diagram.)
For the relationship of each power-supply and signal system, see "4.3 POWER SUPPLY BLOCK DIAGRAM."
If software of the product is updated before performing diagnostics, check that software updating has been performed properly
before proceeding to diagnostics.
If software updating has not been performed properly, update the software, following the instructions in [7] Firmware update of
"6.3 DETAILS ON SERVICE MODE."
B
Contents
[0] Prior Confirmation
[1] Failure in Startup
[2] Display (DATA FL/BROWS FL/JOG FL/LED)
[3] Operations (SW/Volume/JOG)
[4] USB (Type A/Type B)
[5] LAN
[6] AUDIO OUT
[7] CONTROL
[8] DRIVE Assy
[9] EUP Mode
[10] SERVICE MODE
C
[11] Error Codes
The waveform numbers described in this section correspond to the "10.15 WAVEFORMS."
[0] Prior Confirmation
[0-1] Checking in Service Mode
No. Cause Diagnostics Point
1 —
D [0-2] Checking Cables
No. Cause Diagnostics Point
Disconnection,
breakage, or
1 Cables
loose connection
of cables
[1] Failure in Startup
[1-1] No power
E
Even after the unit is turned on, no indication is displayed nor can loading by the DRIVE Assy be performed.
No. Cause Diagnostics Point
Defective power
1 SRV Assy
supply
Defective power
2 SRV Assy
supply/Protector
breakage
3 Signal errors SRV Assy
F
26
1
2
Item to be Checked
Check the failure points in auto device
check / alarm port.
Item to be Checked
Check that all the cables are securely
connected.
Check that there is no breakage in the
cables.
Item to be Checked
Check V+12.
Check V+12EUP. Check also if the protector
(P7302) is broken.
Check the EUP_CONT signal.
CDJ-900
2
3
Corrective Action
See the section describing locations of defects in
this manual.
Corrective Action
Securely connect the cables. If a cable is broken,
replace it.
Corrective Action
If V+12 is not checked, go to step 2.
If V+12 is checked, go to step 3.
If the protector is broken, replace the protector.
If the V+12EUP voltage is not output, the SW
power-supply IC may be defective. Replace it.
If the signal is "L," check the output from the SW
power-supply IC. If V+12 is not output, the SW power-
supply IC may be defective. Replace it.
If the signal is "H," check if the signal logics are the
same as those for normal status shown in the table in
the rightmost column. If either of the signal logics is
not the same, check the mounting status of the
IC8001 or IC8008 on the DFLB Assy, which corres-
ponds to the wrong signal logic. If it is correctly
mounted, then it may be defective. Replace it.
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4
Reference
6.SERVICE
MODE
Reference
4.1 OVERALL
CONNECTION
DIAGRAM
Reference
4.3 POWER SUPPLY
BLOCK DIAGRAM
4.3 POWER SUPPLY
BLOCK DIAGRAM
Refe to "Signal
logic during
EUP mode."
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