Pioneer CDJ-900 Service Manual page 32
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Also See for CDJ-900:
- Operating instructions manual (198 pages) ,
- Manual de instrucciones (32 pages) ,
- Connection manual (10 pages)
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1
A
[6] AUDIO OUT
[6-1] No sound
The analog audio signal is not output.
No.
Cause
Diagnostics Point
Defective power
MAIN Assy
1
supply
/JACB Assy
MAIN Assy
Loose
2
connections
/JACB Assy
B
3
Signal errors
MAIN Assy
4
C
The digital audio signal is not output.
No.
Cause
Diagnostics Point
Loose
1
JACB Assy
connections
2
Signal errors
MAIN Assy
3
MAIN Assy
D
[7] CONTROL
[7-1] Improper fader operation after fader start
No.
Cause
Diagnostics Point
1
Signal errors
JACB Assy
2
Signal errors
MAIN Assy
E
[8] DRIVE ASSY
[8-1] Improper operation of the loading mechanism
No.
Cause
Diagnostics Point
Improper
1
Cables
soldering
Defective power
2
SRV Assy
supply
F
3
Signal errors
SRV Assy
32
1
2
Item to be Checked
Check the voltages for audio (V+10A/V-10A/
REF2R5).
Check also if the protector (P2) is broken.
Check the connection of the audio signal
lines (ROUT/LOUT).
Check the voltages for DAC (IC3003)
(V+5A/V+5D).
Check also if the protector (P3) is broken.
Check the input signal of the DAC(IC3003).
• DSP_SPICLK
• DSP_DATA
• DSP_SPISIMO
• DSP_SPICS
• DSP_MCLK
• DSP_LRCK2
• DSP_BCLK2
Item to be Checked
Check the digital audio signal (SPDIF)
and its connection.
Check the digital audio signal
(SPDIF_OUT).
If the symptom persists after the above
corrections,
Item to be Checked
Check the waveforms of the control signals
(CONT1/CONT2) from the CN8801 on the
JACB Assy.
Check the waveforms of the control signals
(CONT00/CONT01/CONT02) from the
MAIN Assy.
Item to be Checked
Check that the wires between the loading
motor and the SLMB Assy are securely
soldered. Check also the wires are not broken.
Check the power voltages. (V+7R5, V+5D,
V+3D, V+3A, V+1R5 and VHALF)
Check the waveforms of the LPS1 and LPS2
signal lines. (The LPS1 and LPS2 signals
becomes L when the SW is set to ON.)
CDJ-900
2
3
Corrective Action
If the protector is broken, replace the protector.
• If V+10A is not output, check the mounting statuses
of Q1302 and Q1304. If there is any problem, correct it.
• If V-10A is not output, check the mounting statuses of
Q1303 and Q1305. If there is any problem, correct it.
• If VREF2R5 is not output, go to [3].
If connection is improper, resolder it.
If the protector is broken, replace the protector.
If V+5A is not supplied, see "4.3 POWER SUPPLY
BLOCK DIAGRAM", then check the mounting
statuses of peripheral parts. If there is any problem,
correct it. If the mounting is OK, the parts be defective.
Replace it.
If input of any of the signals cannot be confirmed, check
the connections. If soldering is improper, resolder it.
If soldering is properly made, then the DSP (IC501)
may be defective. Replace it.
Corrective Action
If connection is improper, resolder it. If the SPDIF
signal cannot be recognized, go to Step [3].
If the SPDIF_OUT signal can be recognized, then the
transistor (Q506) may be defective. Check the connection.
If no problem is found, replace the transistor. If the SPDIF_
OUT signal cannot be recognized, check the connection.
If soldering is improper, resolder it.
Replace the DSP (IC501).
Corrective Action
If the signal cannot be recognized, the JACB Assy
may be defective. Check the soldering at the JACB
Assy then resolder it, if necessary.
If the signal can be recognized, go to Step [2].
If the input signal can be recognized, then the MAIN
CPU (IC101) may be defective. Replace it. If the input
signal cannot be recognized, the communication line
or the peripheral devices may be loosely connected.
Resolder the terminals.
Corrective Action
If soldering is improper, resolder it.
If the wires are broken, replace them.
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.
If the signal waveform is not proper, the loading
detection SWs (S8901/S8902) may be improperly
soldered or defective. If soldering is improper,
resolder them. If the symptom persists, replace the
defective parts.
3
4
Reference
-
-
-
10.4 MAIN
ASSY(2/3)
Reference
-
10.4 MAIN
ASSY(2/3)
-
Reference
10.15
WAVEFORMS
L
M
,
-
Reference
-
4.3 POWER SUPPLY
BLOCK DIAGRAM
10.1 SRV ASSY
(1/2)
10.15 WAVE-
2
3
FORMS
,
4
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