Diagnosis Flowchart Of Failure Analysis; Whole Unit - Pioneer PDP-5020FD Service Manual

5

5.2 DIAGNOSIS FLOWCHART OF FAILURE ANALYSIS

[1] WHOLE UNIT

Flowchart of Failure Analysis for The Whole Unit
START
Problems concerning STB status
A power-down occurs.
No
A shutdown occurs.
No
Is the STB LED lit?
Yes
Problems concerning the power
Can the unit be turned on
(Relay ON)?
Yes
A power-down occurs.
No
A shutdown occurs.
No
Problems concerning lighting of the panel
(*1): As reset lighting of the 9th-generation panel is faint,
reduce the ambient lighting when checking the display.
Does the screen display reset
lighting? (*1)
Yes
Is the panel arbitrary turned on or
off repeatedly? Or do luminescent
spots appear on the screen?
No
A
5
6
Note: Check that the Main power SW is ON side.
Yes
See "5.3 DIAGNOSIS OF PD (POWER-DOWN)."
Yes
See "5.4 DIAGNOSIS OF SD (SHUTDOWN)."
Is STB 3.4 V power supplied?
No
(Check the power at the IF micro-
computer on the MAIN Assy.)
Yes
Are the voltages at AC_DET and
MSW_DET on the POWER
SUPPLY Unit high?
Yes
If AC_DET or MSW_DET is Low, LED goes off.
Failure analysis for the
MAIN Assy => MA1
Is the voltage at the RELAY port
No
of the connectors between the
DIGITAL Assy and POWER
SUPPLY Unit H (3.4 V)?
Yes
Failure analysis for the
POWER SUPPLY Unit => PS2
Yes
See "5.3 DIAGNOSIS OF PD (POWER-DOWN)."
Yes
See "5.4 DIAGNOSIS OF SD (SHUTDOWN)."
No
Is the drive off?
No
Failure analysis for the
drive system => DR1
Yes
Failure analysis for the
POWER SUPPLY Unit => PS3
Failure analysis for the
drive system => DR2
Yes
PDP-5020FD
6
7
When the panel drive-power is in OFF state, there will be no PD,
except PS_PD.
Check if the cable that connects
No
the POWER SUPPLY and MAIN
Assys is firmly connected.
The green/red LEDs on the DIGITAL Assy indicate ON/STB
of the panel and causes for a power-down or shutdown.
If neither the green nor red LED lights, it is likely that the
power to the STB system is not supplied. (failure, PASV-STB status)
No
Replace the POWER SUPPLY
Unit.
No
Failure analysis for the
MAIN Assy => MA2
In the power startup, the Main microcomputer
controls a relay port earlier than module
microcomputer.
When the panel drive-power is in OFF state, there will be no PD,
except PS_PD.
Yes
Turn the drive on.
In a case where luminescent spots appear
or the panel is repeatedly turned on or off.
In a case where luminescent spots appear.
7
8
NG
Failure analysis for the
POWER SUPPLY Unit => PS1
• Check the DRF SW.
• Before turning the drive off with the RS-232C
commands or using the remote control unit,
turn the unit off.
8
A
B
C
D
E
F
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