Diagnosis Information; The Flow Of Diagnosis - Pioneer PDP-427CMX Service Manual

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3. DIAGNOSIS INFORMATION

3.1 THE FLOW OF DIAGNOSIS

1. Abnormality in power supply
A
No power
Turn the power off at the Main
Power Switch then back on.
Is the POWER/STANDBY
indicator lit?
YES
B
See "Other causes for
shutdown" of "Failure
Diagnosis by LEDs."
C
D
E
F
20
1
2
Note: When an abnormality is detected and indicated by LEDs' flashing or
lighting, all power-supply lines, except for the 7-V DC (M+7 V) and 5-V
DC (M+5 V) lines, will be automatically shut off after about 10 seconds.
When you are going to check the power-supply lines other than the 7-V
DC (M+7 V) and 5-V DC (M+5 V) lines, place a tester to a measurement
point beforehand then check the line.
NO
When POWER/SATNDBY indicator turns on red, perform the power-on
operation with the remote control unit or the RS232C command.
NO
Is AC power supplied to the
AC connector (power cord)?
YES
NO
Is 6.8 V DC output from Pin 1
of the PM connector?
YES
Failure in the LED PWB (failure in D2402 or
CN2401) or in the COMM SLOT IF (failure in
the line for CN2301 or CN2303) or in the MAIN
PWB (failure in the line for CN9010).
PDP-427CMX
2
3
The POWER switch or power cord is defective.
A
3
4
4