Pioneer CDJ-900 Service Manual page 38

1
A
E-7024: MAIN CPU ERROR
• C/FLASH IC (IC114) does not work properly.
No. Cause Diagnostics Point
1 - MAIN Assy
Defective power
2 MAIN Assy
supply
B
Clock signal
3 MAIN Assy
error
4 Signal errors MAIN Assy
Defective power
5 MAIN Assy
supply
C
6 Clock signal MAIN Assy
error
7 Defective parts MAIN Assy
E-7201: TOC READ ERROR
• TOC data cannot be read from a disc.
No. Cause Diagnostics Point
Traverse
1 -
D
mechanism
E-8709: COMMUNICATION ERROR
• Communication between the PANEL CPU (IC8005), GUI CPU (IC4002) and MAIN CPU (IC101) is not possible.
No. Cause Diagnostics Point
MAIN Assy
1 -
/DFLB Assy
E
F
38
1
2
Item to be Checked
First, whether the cause is attributable to the
MAIN CPU (IC101) or to the SDRAM (IC108
/109) must be distinguished at the status
check (alarm) port.
Check the power voltage (V+1R2) of MAIN
CPU (IC101).
Check the waveform of system clock
(26.965 MHz) is input to MAIN CPU
(IC101).
Check that the signals of the CPU_RST
line is H.
Check the power voltage (V+3R3_CPU)
of SDRAM (IC108 and IC109).
Check that the CPU_CLKOUT signal (108
MHz) is output from the MAIN CPU (IC101)
and then input to the SDRAM (IC108/109).
Check the mounting status of the
SDRAM(IC108/109).
Item to be Checked
Measure the error rate in Player Operation
mode of Service mode in order to distinguish
whether the cause is attributable to the disc
or to the player. For measurement, play back
the reading point at which reading resulted in
an error, by listening to the sound.
Item to be Checked
Check the connections of communication
line between the MAIN CPU (IC101) and
PANEL CPU (IC8005) and GUI CPU
(IC4002).
CDJ-900
2
3
Corrective Action
If the MAIN CPU (IC101) is in failure, go to [2].
If the SDRAM (IC108/109) is in failure, go to [4].
If power is not supplied, check the connections of
the power line.
If V+3R3E is supplied, go to [2].
If V+3R3E is not supplied, go to [3].
If it is not, the crystal oscillator (X105) and their peripheral
chips may be defective or their mounting statuses may be
improper. Resolder the parts. If the symptom persists after
this correction, replace the parts.
If it is not "H," check the mounting status of the pull-up
resistor (R159). If it is properly mounted, then the mounting
status of the RESET IC (IC102) may be improper. Resolder
it. If the symptom persists after this correction, replace it.
If power is not supplied, check the connections of
the power line.
Check that the CPU_CLKOUT signal is input to the
SDRAM (IC108/109).
If it is input, check the mounting statuses of the
SDRAM (IC108/109). If they are properly mounted,
then the parts may be defective. Replace them.
If the signal is not input, check the connections for
the CPU_CLKOUT signal.
If it is properly mounted, then replace the MAIN
CPU (IC101).
Corrective Action
See [10] SERVICE MODE for details.
Corrective Action
If connection is improper, resolder it.
3
4
Reference
6. SERVICE
MODE
[6] Output of the
alarm port
4.3 POWER SUPPLY
BLOCK DIAGRAM
10.3 MAIN
ASSY(1/3)
10.15 WAVE-
C
FORMS
10.3 MAIN
ASSY(1/3)
-
10.3 MAIN
ASSY(1/3)
10.3 MAIN
ASSY(1/3)
Reference
"[10]SERVICE
MODE" of this
section
Reference
4.2 SIGNAL
BLOCK DIAGRAM
4