Pioneer MEP-7000 Service Manual page 79

5
[8] Auto Device Diagnosis/Status LED
Whether each device of this product has been properly started or not can be checked either with the results displayed on
the LCD display with auto device diagnosis in Service mode or the status LEDs mounted on each main board of the
control and drive units. If the result of the auto device diagnosis or the status LED shows that some device is judged as
NG, check the list below.
See *6 below for the auto device diagnosis screen.
CONTROL UNT
No. Points to be checked
If the NORTH CPU, FLASH IC, or SDRAM is judged as NG
1
2
3
4
NORTH CPU
/FLASH IC
/SDRAM
5
6
If the USB controller is judged as NG
1
2
USB
CONTROLLER
3
4
5
6
Waveform Items for check
Check the voltage (V+BF1R2D)
101
of the NORTH CPU (IC601).
Check that RST# is H.
101
Check that the clock waveform
(24.576 MHz) signal is input to
110 the NORTH CPU (IC601).
Check if the clock signal (100
MHz) is output from the NORTH
101
-
CPU (IC601). Also check if this
clock signal is input to the
SDRAM (IC610).
Check if the waveforms for the
data bus and address bus
fluctuate between H and L.
-
If the problem is not resolved
- even after the above-mentioned
measures are taken.
Check the voltage (V+BF3R3D)
-
of the USB controller (IC706).
Check that the USB_CS# signal
-
is input to the USB controller
(IC706).
Check that the clock signal
(6 MHz) is input to the USB
-
controller (IC706).
If the problem is not resolved
-
even after the above-mentioned
measures are taken.
6
7
If power is not supplied, check the connection
of the power line.
If it is not, the RESET IC (IC600) may be defec-
tive or improperly soldered. If the problem is not
resolved after it is resoldered, replace the IC.
If the clock signal is not input, the crystal
oscillator (X600) 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 from the NORTH
CPU but not input to the SDRAM, check if
connection is properly made. Correct any poor
connection you find.
If the clock signal is not output, go to [5].
If the waveforms do not fluctuate, communica-
tions among the flash memory (IC609), SDRAM
(IC610), and the NORTH CPU (IC601) may not
be established. Check the mounting status of
the pins of ICs which are linked through the bus.
• NORTH CPU(IC601)
• FLASH MEMORY(IC609)
• SDRAM(IC610)
• USB CONTROLLER(IC706)
• CPLD(IC1700)
Replace the MAIN Assy.
If power is not supplied, check the connection
of the power line.
Check if the USB_CS# signal input to the USB
controller (IC706) fluctuates between H and L.
Resolder the IC if there is any poor connection.
If the clock signal is not input, the crystal
oscillator (X701) and its peripheral chips may
be defective or improperly mounted. Resolder
them. If the problem is not resolved, replace
them.
Replace the USB controller (IC706).
*6
MEP-7000
7
8
Causes and measures
8
A
B
C
D
E
F
79