Diagnosis Of V+34D - Pioneer DJM-900NXS Service Manual

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5.6 DIAGNOSIS OF V+34D

A
The driver power output for the FL (V+34D) is controlled with a transistor switch.
Diagnostic procedures when only V+34D is not output
1 Check V+34D_1 at the prior stage of the transistor (Q1409).
2 If no signal is detected at V+34D_1, the mounting status of the peripheral parts of the 34V DC/DC converter (IC1401)
may be improper or IC1401 itself may be defective.
3 If a signal is detected at V+34D_1, check the input signals to IC1403.
If PowerReset is L, check the connection up to SW power (DWR1492).
If FL_Vcont is L, the mounting status of the MAIN_CPU (IC2011) may be improper or IC2011 itself may be defective.
4 If both PowerReset and FL_Vcont are H:
If the output signal from IC1403 is L, the mounting status of IC1403 may be improper or IC1403 itself may be defective.
5 If the output signal from IC1403 is H, the mounting status of the peripheral parts of Q1408 or Q1409 may be improper or
B
Q1408/Q1409 may be defective.
G
MAIN ASSY
C
D
E
F
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