Pioneer MEP-7000 Service Manual page 69

5
The LED for the USB STOP key does not light.
1 SMAIN ASSY
2 Cable
3
FSWB ASSY
[5-5] If fader start does not function normally
No. Points to be checked
1
Cable
2 SMAIN ASSY
3 SMAIN ASSY
[5-6] USB communication not possible (USB device not recognized, or DJ software inoperable)
No. Points to be checked
Communication via any USB port not possible
1
-
2
SMAIN ASSY
3 SMAIN ASSY
5
6
Check if a signal is input to Pin 9
or 10 of CN350 on the SMAIN
-
Assy.
Check if the FFC that connect the
EJTB and FSWB Assys are
-
securely connected and if there is
breakage in the cables.
Check the voltage at the two
electrodes of the LED.
-
Waveform Items for check
Check if the FFC that connect the
SMAIN and SJACK Assys are
-
securely connected and if there is
breakage in the FFC.
Check the waveform of the
control signal from CN301 on the
26~29
SMAIN Assy.
Check if a signal is input to
EXP.IN1 (IC354).
-
Waveform Items for check
Check the status of the AUDIO
DSP (IC501) and USB controller
(IC402) with the auto device
-
diagnosis or the status LEDs.
Check that the clock signal (6
MHz) is input to the USB
controller (IC402).
38
Check that the HUB_24M clock
signal is output.
37
6
7
If there is an no signal, check the mounting
status of AUDIO DSP (IC501). If it is properly
mounted, the port connector may be defective;
replace it.
If signal is input, go to [2].
If a connection is loose, firmly connect the
cables.
If there is breakage, replace the Cables.
If the voltage in the normal direction is in the
range of 2.2-2.7 V, the LED is defective;
replace it. If the voltage is outside the above
range, the transistor is defective; replace it.
If a connection is loose, firmly connect the
cables.
If there is breakage, replace the Cables.
If no signal is output, poor connection on the
SJACK Assy is suspected. Check the connec-
tions on the SJACK Assy, and resolder, if
necessary.
If a signal is output, go to [3].
If a signal is input, check the mounting status
of the EXP.IN1 (IC354). If it is properly
mounted, then the port connector may be
defective; replace it.
If no signal is input, the mounting status of
parts on the communication line or peripheral
parts may be in problem. Resolder the parts.
If configuration of the AUDIO DSP (IC501) is
not completed, the USB controller (IC706) has
not started. If they are judged as NG, see "[8]
Auto device diagnosis/Status LEDs" in this
section.
If the clock signal is input, the USB controller
(IC402) is defective; replace it.
If the clock signal is not input, the crystal
oscillator (X400) and its peripheral chips may
be defective or improperly mounted. Resolder
them. If the problem is not resolved, replace
them.
If the clock signal is output, check the mount-
ing status of IC401. If it is properly mounted, it
is defective; replace it.
If the clock signal is not output, the crystal
oscillator (X400) and its peripheral chips may
be defective or improperly mounted. Resolder
them. If the problem is not resolved, replace
them.
MEP-7000
7
8
Causes and measures
Causes and measures
8
A
B
C
D
E
F
69