Pioneer CDJ-800MK2 Service Manual page 95

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Freeze (2/2)
Sites Waveforms
≈ Check the waveform at the CPU16M Test Land,
MAIN Assy MAIN Assy
71 referring to the waveform photo, to confirm that the
crystal oscillation circuit is operating normally.
ç Check the waveform at the designated point on the
MAIN Assy MAIN Assy
PRGM line, to confirm that the MPU (IC301) resets
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the FPGA (IC302) properly.
√ Check the waveform at the point designated on the
MAIN Assy MAIN Assy
23 to 30 waveform photo, to confirm that the configuration
procedures between the MPU (IC301) and FPGA
(IC302) are properly performed.
Display (1/2)
Sites Waveforms
Lighting of the LEDs and indications and the FL display on the control panel do not function.
If the power supply is normal, this symptom is caused by a defective DISPLAY MPU (IC501,) which controls the display on the control panel,
including the FL indication and lighting of the LEDs. (If the DISPLAY MPU is normal, the indications of internal data on the DISPLAY MPU,
such as POWERON and E-8709, will be displayed on the DATA-FL display.)
To confirm that the core block of the MAIN Assy is normal, play back a CD without using the control panel and check the audio output.
z Check the power to be supplied to the control
DFLB Assy
SECB Assy panel, paying attention to the following points: (1) Is
REGB Assy the ICP damaged?, and (2) Are cables firmly
connected?
x If power is not supplied to any power system,
TRNS Assy
ACIN Assy check the primary source. Inappropriate commercial
power input or blown primary fuse (FU8001) or glass
fuse (T21) are possible.
c Check the waveform of the XRST line, referring to
DFLB Assy DFLB Assy
the waveform photo, to confirm that the Reset IC
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(IC502) resets the DISPLAY MPU (IC501) properly.
The Reset IC is normal if resetting is canceled about
70 msec after the power is turned on.
v Check the waveform at Pin 12 of IC501, referring
DFLB Assy DFLB Assy
to the waveform photo, to confirm that the crystal
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oscillation circuit is operating normally.
No indication only on the DATA-FL display
If the power supply is normal, this symptom can be caused only by a failure in the DATA-FL (V501) or the communication between the
DATA-FL and DISPLAY MPU (IC501).
z Enter Display Check mode of Service mode and
check if other keys on the control panel function and if
the LEDs light.
x Check the setting of the voltage selector switch (on
ACIN Assy
the rear panel). (for RLF model)
c Check the Vload voltage (VLD, VLDD). If the
DFLB Assy
SECB Assy voltage measured at the periphery of the power
TRNS Assy terminal of the DATA-FL (V501) is 29.3 V DC or
more, it is OK.
v Check the FLAC voltage (FLAC1, FLAC2). If the
DFLB Assy DFLB Assy
74 voltage measured at the both ends of the DATA-FL
(V501) lead is 4 V AC or more, it is OK.
b Check the waveform at Pin 46 of DATA-FL (V501),
DFLB Assy
to confirm that 5 V power is supplied to the built-in
driver.
n Check the points designated in the waveform
DFLB Assy DFLB Assy
to photo to confirm that the procedures of the
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communication between the DISPLAY MPU (IC501)
and the DATA-FL (V501) are normal.
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Points to be checked
Points to be checked
CDJ-800MK2
6
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Causes & Measures to be taken
An unstable waveform or extremely low level
suggests chip fracture or partial damage of the crystal
oscillator (X301). Replace the chip or X301.
An unstable waveform suggests loose connection of
the output terminal of the MPU (IC301) or chip
fracture on the PRGM line.
Even if the waveform at the designated point is
An unstable waveform suggests loose connection of
the output terminal or chip fracture.
Even if the waveform at the designated point is
normal, there may be poor contact of connectors in
downstream lines. Resolder the output connectors,
Causes & Measures to be taken
Replace the ICP or check the cable connections.
Replace the fuses.
Abnormal delay time or an unstable waveform
suggests fracture of the C507 chip. Replace the
C507. If the symptom is not ameliorated, replace the
IC502.
An unstable waveform or extremely low level
suggests chip fracture or partial damage of the crystal
oscillator (X501). Replace the chip or X501.
If the LEDs and JOG-FL (V601) do not light, nor does
the DATA-FL (V501) display, the DISPLAY MPU that
controls those will not function properly. See "Lighting
Set the switch to the position that corresponds to the
commercial power source.
If the voltage is 0 V, the ICPs (IC25, IC58, and IC59)
are fried. Replace the ICPs.
If the AC current waveform does not appear, check
the connection between the Assys.
If the 5 V power is not supplied, soldering touchup is
needed.
A solder fracture of the DATA-FL terminal or loose
connection of the terminals on the communication line
between the DISPLAY MPU and the DATA-FL is
suspected. Soldering touchup is needed. If the
symptom is not ameliorated after soldering touchup,
replace the DATA-FL.
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