Pioneer CDJ-900 Service Manual page 27

5
No. Cause Diagnostics Point
Defective power
supply/Protector
4 SRV Assy
breakage
[1-2] Startup stops with the "Pioneer" logo displayed on the screen. (See *1.)
If startup stops in such a status, the upstream and downstream communications between the MAIN CPU and PANEL CPU/GUI CPU
could not be established.
No. Cause Diagnostics Point
Version upgrade
1 —
failed.
—
2 MAIN Assy
[2] Display (DATA FL/BROWS FL/JOG FL/LED)
The DATA FL, BROWS FL and the LEDs (LINK, USB, DISC, BROWS, TAG LIST, INFO, MENU) are controlled by
the GUI CPU (IC4002).
The JOG FL and the other LEDs are controlled by the PANEL CPU (IC8005).
[2-1] Any of the DATA, BROWS, and JOG FLs are not lit.
All types of driver power to be supplied are produced at the JFLB Assy.
No. Cause Diagnostics Point
JFLB Assy/
Breakage
1
SRV Assy
of protectors
[2-2] Neither the DATA nor BROWS FL is lit.
Driver power to be supplied to the DATA and BROWS FLs is produced at the JFLB Assy.
No. Cause Diagnostics Point
Defective power
1 JFLB Assy
supply
[2-3] The BROWS FL does not light.
No. Cause Diagnostics Point
Defective power
1 BFLB Assy
supply
2 Signal errors BFLB Assy
Defective parts
3
of FL
5
6
Item to be Checked
Check V+7R2, V+5, V+3R3 and check
whether protector (P7302) does not break.
V+7R2 => P7310
V+3R3 => P7307
Refer to 4.3 POWER SUPPLY BLOCK
DIAGRAM.
Item to be Checked
Version upgrade of the software for the
DRIVE unit may have failed.
Check a failure point at the status check
(alarm) port of the MAIN Assy.
Item to be Checked
Check V+12 and check whether protectors
do not break.
JFLB Assy => P9402/P9405
SRV Assy => P7310
Item to be Checked
Check supply voltages (V+33/V+54) of
the FL.
Item to be Checked
Check the power-supply voltages
(V+3R3/V+7R2/V+54) of the FL.
Check the output signal and connection of
communication line of BROWS FL in the
BFLB Assy.
• B_SCLK
• B_BK
• B_LAT
• B_DSO
If the symptom persists after the above
corrections,
CDJ-900
6
7
Corrective Action
If the protector is broken, replace the protector.
Check the mounting statuses of the regulator IC and
its peripheral parts for each power supply.
If they are properly mounted, then the parts may be
defective. Replace them.
Reference: Signal logic during EUP mode
Normal mode EUP mode
EUP_CONT
PANEL CPU(IC8005) pin28
CPU_EUP_CONT
X : Not Concerned
Corrective Action
If upgrading failed, startup stops with the "Pioneer"
logo displayed on the screen, and the LED for the
USB STOP key flashes repeatedly.
See "6. SERVICE MODE."
If there is a point that has been judged as in failure,
see "6. SERVICE MODE" in this section.
Corrective Action
If the protector is broken, replace the protector.
Corrective Action
If the presence of power is confirmed, check the
connections to these FLs.
If the presence of power is not confirmed, check the
mounting statuses of the power circuit (IC9401) and
its peripheral parts. If there is any problem, correct it.
Corrective Action
If the presence of power is not confirmed, check the mounting
statuses of the regulator IC and its peripheral parts for each
power supply. If they are properly mounted, then the parts may
be defective. Replace them.
If no signal is output, the GUI CPU (IC4002) port
may be damaged. Replace it.
If soldering is improper, resolder it.
Replace the BROWS FL.
7
8
A
Reference
4.3 POWER SUPPLY
BLOCK DIAGRAM
L H or open
H L
B
X L
Reference
6.SERVICE
MODE
6.SERVICE
MODE
C
Reference
D
4.3 POWER SUPPLY
BLOCK DIAGRAM
Reference
4.3 POWER SUPPLY
BLOCK DIAGRAM
E
Reference
4.3 POWER SUPPLY
BLOCK DIAGRAM
10.10
BFLB ASSY
F
—
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