Pioneer KRP-500P - [2] POWER SUPPLY UNIT; Flowchart of Failure Analysis for The POWER SUPPLY Unit

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KRP-500P
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[2] POWER SUPPLY UNIT
Flowchart of Failure Analysis for The POWER SUPPLY Unit
Is the cable connected firmly to
the P7 connector?
Is the cable to the P7 connector
broken?
Check the voltage at the MAIN Assy and
POWER SUPPLY Unit.
Check the resistance between D025 cathode
and C101 (+), using a tester.
Properly connect the cable between
the P7 and M2 connectors.
No
Replace the defective cable (J109).
Ye s
Ye s
Is the fuse (F001) blown?
Replace the POWER SUPPLY
Unit.
Replace the POWER SUPPLY
Unit.
Replace the POWER SUPPLY
Unit.
Replace the POWER SUPPLY
Unit.
Ye s
No
Is one of the limiting resistor
(FR002) blown?
Ye s
No
The POWER SUPPLY Unit is
normal.
The POWER SUPPLY Unit is
normal.
STB 3.4 V power is not output.
No
Is the VADR voltage within the
specified values?
Is the VSUS voltage within the
specified range?
Is there a fluctuation in the
VADR voltage?
Is there a fluctuation in the
VSUS voltage?
The ripple must be within 5 V.
The ripple must be within 10 V.
The specified voltage values are between
72 and 78 V.
The specified voltage values are between
200 and 210 V (VSU: 125/35°C).
No
Ye s
Ye s
No
No
Ye s
Ye s
The cells of the panel do not
light normally.
No
The POWER SUPPLY Unit is
normal.
The power is not on, even though
the RELAY port is active.
Is the relay (RY002) on?
• Check the relay operation at the RY002.
(Voltage: 3.4 V)
• Check the relay sound (click).
No
Ye s
Is the PFC voltage normal?
• Check the voltage between the C017 (-) and
C017 (+).
• The voltage must be around 400 V.
(340V or less are defective.)
Caution: High voltage!
Replace the POWER SUPPLY
Unit.
Replace the POWER SUPPLY
Unit.
Replace the POWER SUPPLY
Unit.
Replace the POWER SUPPLY
Unit.
No
Ye s
Failure analysis for the
POWER SUPPLY Unit => PP1
Failure analysis for the
POWER SUPPLY Unit => PP2
Failure analysis for the
POWER SUPPLY Unit => PP3