Pioneer CDJ-850 Service Manual page 27
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Also See for CDJ-850:
- Operating instructions manual (88 pages) ,
- Manuel du propriétaire (32 pages) ,
- Quick start manual (3 pages)
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5
[4] USB (USB-Type A), PC (USB-Type B)
[4-1] USB (USB-Type A)
Check the following, with a USB device connected to the USB-Type A connector.
No.
Cause
Diagnostics Point
USBA Assy
Loose
1
CMPX Assy
connections
MAIN Assy
USB VBUS is
USBA Assy
2
defective.
CMPX Assy
3
Defective part
CMPX Assy
[4-2] PC (USB-Type B) does not work
Check the following, with a USB device connected to the USB-Type B connector.
No.
Cause
Diagnostics Point
Loose
1
—
connections
—
2
Defective part
[5] AUDIO OUT
The analog audio signal is not output.
No.
Cause
Diagnostics Point
MAIN Assy
Loose
1
connections
CMPX Assy
MAIN Assy
MUTE signal
2
DFLB Assy
error
CMPX Assy
3
Power failure
MAIN Assy
Signal error
4
MAIN Assy
Defective part
[6] CONTROL
Improper fader operation after fader start.
No.
Cause
Diagnostics Point
MAIN Assy
Loose
1
connections
CMPX Assy
Signal error
2
MAIN Assy
Defective part
5
6
Item to be Checked
Check the connections of the USBA_D_P/N
communication line, USB_VBUSON and
USB_CODETFLG signal lines.
Check the voltage level of V+5_USB
(JA2201-pin 1 and IC2002-pin 3) of USB
power supply.
Check the signal level of USB_CODETFLG
(IC2003-pin 5) and USB_VBUSON(IC504-
pin 4).
Item to be Checked
Check the connections of the USBB_D_P/N
communication line and VBUS_B signal line.
If the symptom persists after the above
corrections,
Item to be Checked
Check the connection of the audio signal
lines (ROUT/LOUT).
Check the AMUTE signal.
"L" (release mute) at normal playback.
Check the MAIN_XMUTE signal.
"H" (release mute) at normal playback.
Check the voltages for audio (V+10_A,
V-AUDIO(V-10_A), V+5_A, V+3R3_A,
V+1R25).
Check also if the protector (P2003) is
broken.
Check the AUDIO DSP (IC301) and AUDIO
DAC (IC302).
Item to be Checked
Check the connection of the control signal
lines (CONT1/CONT2).
Check the waveform of the control signal
lines (CONT1/CONT2).
CDJ-850
6
7
Corrective Action
If connection is improper, resolder it.
If the voltage of IC2002-pin 3 is abnormal, IC2002
may be defective.
If the voltage of JA2201-pin 1 is abnormal, go to [3].
• If the USB_VBUSON(IC504-pin 4) is not "H", MAIN
CPU(IC103) may be defective.
• If the USB_VBUSON(IC504-pin 4) and USB_
CODETFLG(IC2003-pin 5) are "H", IC2003 may be
defective.
• If the USB_VBUSON(IC504-pin 4) is "H" and USB_
CODETFLG(IC2003-pin 5) is "L", USB power
supply may be short-circuited in the ground or
IC2003 may be defective.
Corrective Action
If connection is improper, resolder it.
The MAIN CPU (IC103) may be defective.
Corrective Action
If connection is improper, resolder it.
If the signal is abnormal, loose connection and mute
circuit may be defective.
• If the V+10_A voltage level is abnormal, Q2028
and its peripheral parts may be defective.
• If the V-AUDIO(V-10_A) voltage level is abnormal,
Q2031 and its peripheral parts may be defective.
• If the V-5_A voltage level is abnormal, IC406
and its peripheral parts may be defective.
• If the V+3R3_A voltage level is abnormal, IC402
and its peripheral parts may be defective.
• If the V+1R25 voltage level is abnormal, IC403
and its peripheral parts may be defective.
AUDIO DSP (IC301), AUDIO DAC (IC302) and its
peripheral parts may be defective.
Corrective Action
If connection is improper, resolder it.
If the input signal cannot be recognized at input pin
of MAIN CPU (IC101), the signal line or the
peripheral devices may be defective.
If the input signal can be recognized, the MAIN
CPU (IC103) may be defective.
7
8
A
Reference
—
10.13 VOLTAGES
7
B
10.15 EACH
SIGNAL LEVEL
L
K
Reference
10.15 EACH
C
SIGNAL LEVEL
[10] Basic operation
check of CPU/DSP
Reference
—
D
10.15 EACH
SIGNAL LEVEL
H
I
10.13 VOLTAGES
5
6 16 11 12
[10] Basic operation
E
check of CPU/DSP
Reference
—
10.14
F
WAVEFORMS
27
8
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