Pioneer CDJ-800MK2 Service Manual page 96

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Display (2/2)
Sites Waveforms
No indication only on the JOG-FL display
A If the power supply is normal, this symptom can be caused only by a failure in the JOG-FL (V601) or the communication between
the JOG-FL and the DISPLAY MPU (IC501).
ACIN Assy
JFLB Assy
DFLB Assy
SECB Assy
TRNS Assy
B
JFLB Assy
JFLB Assy
JFLB Assy JFLB Assy
to
60 63
C
No indication on either the DATA-FL nor JOG-FL displays
This symptom occurs when the Vload voltage, to be supplied to both the DATA-FL (V501) and JOG-FL (V601), is not supplied.
JFLB Assy
DFLB Assy
SECB Assy
Part of the FL display does not light, frequently flickers, or is dark.
DFLB Assy
D
JFLB Assy
JFLB Assy
DFLB Assy
SECB Assy
TRNS Assy
Black dots or stains appear on some parts of the FL display afer Display Check mode of Service mode is entered.
E
F
96
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Points to be checked
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 the rear panel). (for RLF model)
c Check the Vload voltage (VLD, VLDD, VLDJ).
If the voltage measured at the periphery of the
power terminal of the JOG-FL (V601) is 27.8 V
DC or more, it is OK.
v Check the FLAC voltage (FLAC3, FLAC4). If
the voltage measured at the both ends of the
JOG-FL (V601) lead is 2.6 V AC or more, it is
OK.
b Check the waveform at Pin 23 of JOG-FL
(V601), to confirm that 5 V power is supplied to the
built-in driver.
n Check the points designated in the waveform
photo to confirm that the procedures of the
communication between the DISPLAY MPU
(IC501) and the JOG-FL (V601) are normal.
z Check if the Vload voltage (VLD, VLDD,
VLDJ) is supplied.
x Check if the Vload power circuit is reset
canceled. Check if the voltage at Pin 9 of CN56
becomes high after the power is turned on.
z Visually check if the symptom occurs
constantly in the same area.
x If the symptom does not occur in the same
area, check the waveform of the Vload voltage,
FLAC voltage and 5 V power, to confirm that the
supply is stable.
(See Steps c, b, and n in "No indication only
on the DATA (or JOG)-FL display.")
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Causes & Measures to be taken
If the LEDs and DATA-FL (V501) do not light, nor
does the JOG-FL (V601) display, the DISPLAY
MPU that controls those will not function
properly. See "Lighting of the LEDs and
indications and the FL display on the control
panel do not function."
Set the switch to the position that corresponds to
the commercial power source.
If the voltage is 0 V, the ICPs (IC25, IC58, IC59,
and IC603) 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 JOG-FL terminal or loose
connection of the terminals on the
communication line between the DISPLAY MPU
and the JOG-FL is suspected. Soldering touchup
is needed. If the symptom is not ameliorated
after soldering touchup, replace the JOG-FL.
If the voltage is 0 V, the ICPs on the line are
fried. Replace the ICPs.
Resetting of this circuit is performed by the Reset
circuit (IC502) mounted on the DLFB Assy.
Resetting is done simultaneously with the
DISPLAY MPU (IC501). As only the FL display
has a problem, Pin 9 of CN501 on the DFLB
Assy is in failure.
If the symptom occurs constantly in the same
area, the FL display is defective.
If the supply is unstable, soldering touchup is
needed. If the symptom persists, replace the
part.
Impurities in the FL tube are the cause.
For amelioration, replace the DATA-FL or JOG-
FL.
CDJ-800MK2
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Remarks
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