Pioneer KRP-500P Service Manual page 49

5
Failure analysis for the
drive system => DR2
Abnormality across the whole
screen such as luminescent spots.
Is the adjustment value of each
voltage within the appropriate range?
* Using ADJ1 on the Panel Factory menu or the QAJ
command, check if the adjustment value is within the
range described in the table below.
Yes
Another Assy may
be in failure.
D
5
6
No
Because it is difficult to identify which drive is in failure, follow the flowchart below to check each Assy.
Y DRIVE Assy / SCAN Assy
Y DRIVE Assy
Are all the connectors properly
connected?
Yes
Is the VH set voltage (140 V)
correctly set?
Yes
Is the output value of each voltage
from the Y DRIVE Assy appropriate?
Yes
• Compare the measurement value at the last output stage of each
voltage against the value calculated using the measurement value
of the DAC output voltage. (See the table below.)
• There may be a case where the setting of a Adjustable resistor on
the Assy is out of range.
Is the waveform normal when the
voltage is applied to the panel?
(See the oscilloscope photos.)
No
Is the input signal normal?
(See the oscilloscope photos.)
Yes
Is the waveform of the control
signal from the SCAN Assy normal?
(See the oscilloscope photos.)
Yes
Replace the SCAN IC.
KRP-500P
6
7
To "8.4. Adjustment when the Service
Panel Assy is Replaced"
When go forward to the section "8.4 Adjustment when the service panel Assy
is replaced" from this step, please be careful to the following items.
• Do not clear hour meter and pulse meter.
(for readjustment in the panel non-replacement)
• Input a setting value of label mention example as preparations.
(because a product panel does not have a label)
X DRIVE Assy
B
No
Reconnect the connectors.
No
Set the VH voltage correctly.
No
No
Replace the FFC cables.
NG
Replace the DIGITAL Assy.
No
Replace the Y DRIVE Assy.
7
8
ADDRESS Assy
C
8
A
B
C
D
E
F
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