Troubleshooting - Pioneer XDJ-RX Service Manual

5

5.2 TROUBLESHOOTING

Before starting troubleshooting, check that all cable connectors are properly engaged.
Before replacing a microcomputer, check also the items shown below.
In a case where a failure of EUP UCOM
(IC3601) is suspected
Failure in startup and in the communication system
Failure in the power system
In the following diagnostic procedure, because power will be forcibly supplied even if any power circuit is abnormal,
circuit that uses the power supply may fail if power supply
diagnostic procedure so that the unit will not remain forcibly powered.
Before starting checking the power system, be sure
to check if each power IC is short-circuited with
GND, referring to "10.45 VOLTAGES."
No short-circuit
Disconnect the AC power cord from the
product then reconnect it after a while.
Confirmation of
SW power
Is the voltage of V+12STB
(SW power output) 12 V?
Yes
Confirmation of
the protectors
Is the voltage at both
ends of P101 12 V?
Yes
Is the voltage at Pin 6
(V+12E) of IC3603 12 V?
Yes
Is the voltage of V+3R3E
(IC3603 output) 3.3 V?
Yes
Set the POWER switch to ON and check
the MASTER REC LED.
Confirmation of
power-failure detection
Check the MASTER REC LED.
Flashing in red
Disconnect the AC power cord from the product then remove R325
(0 Ω) from the MAIN Assy. Reconnect the AC power cord then set
the POWER switch to ON to monitor each power IC.
IMPORTANT: Because the voltage monitoring circuit is disabled,
disconnect the AC power cord within several seconds.
If the MASTER REC LED is flashing in red or the voltage of F-DET is 0 V, it is recommended that the following circuits be checked first:
• Peripheral circuits of IC401 (V+15A/V-15A generation circuits)
• Q401, Q402, D401, D402
5
6
Check the voltage, oscillation waveforms of the X'tal, and canceling of
reset, referring to "1
Startup" in "10.46 WAVEFORMS."
• MIXB Assy: IC3602, IC3603, X3601
continues. Be sure to disconnect the AC power cord some seconds after it is connected during the
As abnormality of the POWER SUPPLY Assy or the associated cables
No
is suspected, check the following power source and cables:
• POWER SUPPLY Assy
• Cables and connectors connected with the POWER SUPPLY Assy
Check conduction of P101. If current is not conducted, replace the
No
protector.
• MAIN Assy: P101
Failure in the connection between the MAIN Assy and MIXB Assy, or
No
IC3603 or its peripheral circuit is suspected.
Check the cables, connectors, and parts on the path between
V+12EUP of the MAIN Assy and V+12E of the MIXB Assy.
Failure in IC3603 or the parts connected with it is suspected.
No
Check the parts connected with V+3R3EUP in the MAIN Assy and
V+3R3E in the MIXB Assy.
Lit or unlit
(NOT flashing in red)
Check the voltage of F-DET.
Check the voltage at each block.
Check the circuits or power ICs that use the
power supply with abnormal voltage.
6
7
From plugging in of the power cord to EUP
A type of abnormality that cannot be detected by
3.3 V
the voltage monitoring circuit is suspected.
Check if the voltage value is within the normal
range, referring to "10.45 VOLTAGES."
0 V
XDJ-RX
7
8
the defective point may produce heat and the
Reattach R325 (0 Ω) to the MAIN Assy.
(For enabling the voltage-monitoring function)
Check that the product operates properly.
8
A
B
C
D
E
F
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