Pioneer DDJ-T1, Руководство по обслуживанию

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24
DDJ-T1
1 2 3 4
A
B
C
D
E
F
1 2 3 4
[1-2] Failure in the microcomputer system
4-1 Power failure
1
UCOM Assy
FAULT_DET
Check if the voltage monitoring circuit was
activated:
Turn the unit O
N then check the voltages
shown below.
V +5_D:
FAULT_DET, R147 (0
Ω
) :
Turn the unit O N then check the voltages shown below.
V +5_D: 2 V or less (abnormal voltage), 4.5 V or higher
(normal voltage)
FAULT_DET, R147(0
Ω
): 0 V (abnormal voltage detection),
3.3 V (normal voltage)
In a case of abnormal voltage detection, see [4–2] Power
failure
2
.
In a case of normal voltage, poor control over the
microcomputer system may be suspected.
4.3 POWER
SUPPLY BLOCK
DIAGRAM
5.3 VOLTAGE
MONITORING
4.3 POWER
SUPPLY BLOCK
5.3 VOLTAGE
MONITORING
4.1 OVERALL
CONNECTION
DIAGRAM
4.3 POWER
SUPPLY BLOCK
4.1 OVERALL
CONNECTION
DIAGRAM
4.3 POWER
SUPPLY BLOCK
5.3 VOLTAGE
MONITORING
4-2
Power failure
2
Identification of
defective Assy
UCOM Assy
FAULT_DET
CDJB
CDCB
DJMB
JACB
HPJK
MICB
Identify the Assy on which a voltage error
was generated.
Remove all cables other than the cable for
C
N 1004 (USBB to UCOM) from the UCOM
Assy.
Turn the unit O N then check the V +5_D
voltage.
V +5_D:
FAULT_DET, R147 (0
Ω
):
Remove all cables other than the cable for C N 1004 (USBB
to UCOM) from the UCOM Assy.
Turn the unit O
N then check the V +5_D voltage.
V +5_D: 4.5 V or higher (normal)
FAULT_DET, R147(0
Ω
): 3.3 V normal, no detection of a
voltage error)
In a case of normal voltage, see [4–3] Abnormal voltage
detection
3
.
In a case of abnormal voltage detection, see [4-4] Power
failure, UCOM Assy.
4-3
Power failure
3
Identification of
defective Assy
UCOM Assy
FAULT_DET
CDJB
CDCB
DJMB
JACB
HPJK
MICB
With all cables other than the cable for
C
N 1004 (USBB to UCOM) disconnected
from the UCOM_ASSY, identify the defective
Assy by connecting each connector on the
UCOM Assy one by one for voltage checks.
Identify the defective ASSY, by connecting each connector
on the UCOM Assy, as shown below, one by one for
voltage checks:
CDJ1B: C
N 905, C N 906
CDJ2B: C N 903, C N 904
CDCB: C N 901, C N 902
DJMB: C N 1001, 1002
JACB: C N 302, C N 501
HPJK: C N 301
MICB: C N 303
Repair the defective part of the defective Assy.
If further identification of defective Assys is required, see
the notes in “5.3
V oltage Monitoring” before proceeding to
further diagnostics.
4-4
Power failure
4
UCOM Assy
Identification of
defective Assy
UCOM Assy
FAULT_DET
Deactivate the voltage monitoring circuit
then check the section with improper
voltage.
The voltage monitoring circuit can be deactivated by
removing R147 (0
Ω
) on the FAULT_DET.
See the notes in “5.3 V oltage Monitoring” before
proceeding to further diagnostics.
To identify the section with improper voltage, check
the voltage at each point on the UCOM Assy.
1
Power failure in
the MAI
N _UCOM
UCOM Assy
Check if a voltage error was detected.
Check the power terminal of the
MAI
N _UCOM (IC701).
If the detected voltage error is confirmed, check conduction
between the power supply and G
N D.
Check the power line and the parts, such as coils (beads),
resistors, and capacitors.
If no problem was found with the parts, power line, and
conduction between the power supply and G
N D, the
MAI N _UCOM (IC701) may be defective.
Abnormal
Voltage Detection
2
MAI N _UCOM
Reset circuit
error
UCOM Assy
Check the Reset terminal (Pin 17) of the
MAI
N _UCOM (IC701). (High/Low)
In normal operation, the voltage of the Reset terminal
(Pin 17) is high.
If the voltage of the Reset terminal is low, check the power
line, resistors, capacitors, and the Reset IC (IC106).
If the voltage level remains low after the Reset IC (IC106)
is replaced, the MAI
N _UCOM (IC701) may be defective.
3
MAI N _UCOM
X'tal error
UCOM Assy
Check the oscillation waveforms of the
X'tal (X701).
Check the waveforms of the X'tal (X701).
If an error is found, check the power line, resistors, and
capacitors.
If the waveform remains abnormal after the X'tal (X701) is
replaced, the MAI
N _UCOM (IC701) may be defective.
4
MAI N _UCOM
startup error
UCOM Assy
After startup, check the lighting statuses of
the LEDs.
(For example, although some of the LEDs
light properly, the unit is not started up
properly.) Refer to “[4] Error Indications” in the 6. Service Mode.
If there is no corresponding error indication, reload the
program via USB.
If the normal status is not recovered after all above steps
are performed, the MAI
N _UCOM (IC701) may be
defective.
6. Service Mode
[4]
Error Indications
No. Cause/Symptom Point to be checked
Item to be checked How to distinguish a defective point and/or corrective action Reference
No. Cause/Symptom Point to be checked Item to be checked How to distinguish a defective point and/or corrective action Reference
10.17 WAVEFORMS
Abnormal voltage
detection
k
,
p
10.17 WAVEFORMS
Abnormal voltage
detection
k
,
p
10.17 WAVEFORMS
MAIN UCOM
start up
10.17 WAVEFORMS
MAIN UCOM
start up
i
10.17 WAVEFORMS
MAIN UCOM
start up
j