Pioneer CDJ-900 Service Manual page 28

1
A
[2-4] The DATA FL does not light.
No. Cause Diagnostics Point
Defective power
1 DFLB Assy
supply
2 Signal errors DFLB Assy
Defective parts
3
B
of FL
[2-5] The JOG FL does not light.
No. Cause Diagnostics Point
Breakage
1 JFLB Assy
of protectors
Defective power
2 JFLB Assy
supply
3 Signal errors JFLB Assy
C
4 Defective parts
of FL
[2-6] The LED does not light.
LED (LINK, USB, DISC, BROWS, TAG LIST, INFO and MENU)
No. Cause Diagnostics Point
1 Signal errors BFLB Assy
Defective parts
D
2 BFLB Assy
of LED
Defective parts
3 BFLB Assy
of transistor
LED (except for the USB STOP indicator) on KSWB Assy does not light.
No. Cause Diagnostics Point
Breakage
1 MAIN Assy
of protectors
2 -
E
3 Signal errors DFLB Assy
4 -
USB STOP indicator does not light.
This LED is controlled by the MAIN CPU (IC101).
No. Cause Diagnostics Point
Breakage
1 MAIN Assy
of protectors
Defective parts
2 BFLB Assy
of LED
F
Defective MAIN Assy/
connection/
3 DFLB Assy/
Signal errors
KSWB Assy
4 -
28
1
2
Item to be Checked
Check the power-supply voltages (V+3R3/
V+7R2/V+33) of the FL.
Check the waveforms and connection of the
FL communication line in the DFLB Assy.
• D_SCLK
• D_BK
• D_LAT
• D_DSO
If the symptom persists after the above
corrections,
Item to be Checked
Check if the protector (P9401) is broken.
Check the power-supply voltages (V+3R3/
VFDP2R9_F1/VFDP2R9_F2/V+27) of
the FL.
Check the connection of the FL communi-
cation line in the JFLB Assy.
• J_SCLK
• J_BK
• J_LAT
• J_DSO
If the symptom persists after the above
corrections,
Item to be Checked
Check that the control signal for the LED
in question is output from the GUI CPU
(IC4002).
Check that the forward voltage (2.2 - 2.7 V)
is present at both ends of the LED.
If the symptom persists after the above
corrections,
Item to be Checked
Check if the protector (P3) is broken.
The LEDs (except for the USB STOP indica-
tor) on the KSWB Assy are lit dynamically
in a matrix pattern.
-
Check if the unlit LED belongs to a certain
line/column group, referring to the circuit
diagrams.
Check that the control signal for the LED
in question is output from the PANEL CPU
(IC8005).
- If the symptom persists after the above corrections, The transistor is defective. Replace it.
Item to be Checked
Check if the protector (P3) is broken.
Check that the forward voltage (2.2 - 2.7 V)
is present at both ends of the LED.
Check the connection of the LED control
signal.
- If the symptom persists after the above corrections, The transistor is defective. Replace it.
2
3
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 DATA FL.
Corrective Action
If the protector is broken, replace the protector.
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 JOG FL.
Corrective Action
If no signal is output, the GUI CPU (IC4002) port
may be damaged. Replace it.
If soldering is improper, resolder it.
If the forward voltage is not present, then the LED
itself is defective. Replace it.
The transistor is defective. Replace it.
Corrective Action
If the protector is broken, replace the protector.
If it does not belong to a group, then that LED may
be defective. Replace it.
If it belongs to a group, then the LED-drive signal for
that group is defective.
Go to [2].
If no signal is output, the PANEL CPU (IC8005)
port may be damaged. Replace it.
If soldering is improper, resolder it.
Corrective Action
If the protector is broken, replace the protector.
If the forward voltage is not present, then the LED
itself is defective. Replace it.
If the signal is not output even if the connections are
properly made, the port on the MAIN CPU (IC101)
may be damaged. Replace it.
CDJ-900
3
4
Reference
4.3 POWER SUPPLY
BLOCK DIAGRAM
10.7 DFLB and
ENCB ASSYS
10.10
BFLB ASSY
—
Reference
—
4.3 POWER SUPPLY
BLOCK DIAGRAM
10.13
JFLB ASSY
10.10
BFLB ASSY
—
Reference
-
-
-
Reference
-
10.8
KSWB ASSY
(Schematic
diagram)
-
-
Reference
-
-
-
-
4