Pioneer DDJ-T1, Руководство по обслуживанию

Страница: 28 / 135

2 8
DDJ-T1
1 2 3 4
A
B
C
D
E
F
1 2 3 4
[4] USB connection
[4-1] The unit cannot be recognized by the PC when connected to the PC via USB connection.
Check the following, with a Windows/MAC PC connected via the USB port of the unit, using the supplied USB cable:
1 Failure in startup
UCOM/USBB
Assy
Check the lighting statuses of the LEDs
during startup.
If no LED lights, see [1] Failure in Startup.
[1] Failure in
Startup
2
Defective
USB_UCOM UCOM/USBB
Assy
Check the communication waveforms of
the USB DP/D
N lines.
If the unit is connected to a PC via the USB cable,
communication will be performed through the USB
DP/D
N lines.
If communication cannot be performed, check the
USB cable, connectors, internal cables, resistors,
capacitors, and filters.
If nothing is wrong with them, check the items listed
in “Failure in the microcomputer system” and “USB
UCOM startup error.”
Failure in the
microcomputer
system
USB_UCOM
startup error
[5] AUDIO OUT
[5-1] No signal is output from the MASTER connectors
1 — MASTER1/2
Identify the connector(s) that do(es) not
output signals.
Check if no signal is output from both MASTER 1 and 2 or
either of them.
• If neither MASTER 1 nor 2 connector outputs, go to [2].
• If only the MASTER 1 connector does not output, go to [7].
• If only the MASTER 2 connector does not output, go to [8].
—
2 — UCOM Assy
Check the audio signal, using Pins 5 and 9
of the C
N 501 on the UCOM Assy.
If no audio signal is output, loose connection or
defective parts in the UCOM Assy may be suspected.
• If an audio signal is output, go to [7] or [8].
• If an audio signal is not output, go to [3].
10.4 UCOM
ASSY (3/6)
10.4 UCOM
ASSY (3/6)
10.4 UCOM
ASSY (3/6)
10.4 UCOM
ASSY (3/6)
10.4 UCOM
ASSY (3/6)
10.1 JACB ASSY
10.1 JACB ASSY
3 — UCOM Assy
Check that an audio signal is output from
DAC (IC506).
• If an audio signal is output, go to [5].
• If an audio signal is not output, go to [4].
4 UCOM Assy
Check the digital input signals to DAC (IC506).
• DAC_RST
• MCLK
• BCLK
• LRCK
• MASTER_DATA
If any of the signals is not input, check the soldering
status of DAC (IC506).
If the level of DAC_RST is L, check the connections
of the MAI
N _UCOM (IC701). If nothing is wrong with
the connec-tions, then the MAI N _UCOM (IC701)
itself may be defective.
If other signals are not input, check the connections
of the USB_UCOM (IC202). If nothing is wrong with
the connections, then the USB_UCOM (IC202) itself
may be defective.
5 UCOM Assy
Check that the MUTE signal level is L
(muting canceled).
If the MUTE signal level is L (muting canceled,)
check the connections between the DAC and C
N 501.
If nothing is wrong with the connections, soldering of
the OP amp (IC501) or the OP amp itself may be
defective.
If the MUTE signal level is H, go to [6].
6 UCOM Assy
Check that the A_MUTE signal level is L
(muting canceled).
If the A_MUTE signal level is L (muting canceled,)
check that the signal logics for Q583/Q505/Q506/
Q581/Q582 are the same as those described in the
schematic diagrams. If any of the signal logic is not
the same, repair the defective point.
If the A_MUTE signal level is not L (muting canceled),
the soldering status of the MAI
N _UCOM (IC701) or
the MAI N _UCOM itself may be defective.
7 JACB Assy
Identify the point where the audio signal is
interrupted on the line from C
N 4401 to the
jacks (JA4402/JA4404).
If the audio signal is interrupted at the periphery of
the OP amp (IC4403/IC4405), check the soldering
status of the OP amp. If it is properly soldered, then
the OP amp itself may be defective.
8 JACB Assy
Identify the point where the audio signal is
interrupted on the line from C
N 4401 to the
jacks (JA4403).
If the audio signal is interrupted at the periphery of
the OP amp (IC4404), check the soldering
status of the OP amp. If it is properly soldered, then
the OP amp itself may be defective.
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
Loose connection
/defective parts
Loose connection
/defective parts
Loose connection
/defective parts
Loose connection
/defective parts
Loose connection
/defective parts
10.17 WAVEFORMS
USB DP/DN (1),(2)
t
,
u
10.17 WAVEFORMS
DAC reset cancel
DAC I2S (1),(2)
10.17 WAVEFORMS
Output MUTE cancel
#
10.17 WAVEFORMS
Output MUTE cancel
"