Mitsubishi Q172CPU User Manual page 183

6 INSPECTION AND MAINTENANCE
(b) Flowchart for when "MODE" LED is turned off.
The following shows the flowchart when the "MODE" LED is turned off at
the power supply ON.
"MODE" LED is turned off
Is the power
supply for all the power
supplies modules turned on?
Is the wiring of the power supply
module correct?
YES
Is the LED of
power supply
module turned on?
YES
Is the
connecting direction of
extension cable correctly?
(Isn't IN- IN or OUT-OUT
connection?)
YES
Is the
CPU module of the No.1
and corresponding CPU module
RESET/L.CLR switch in the
neutral position?
Neutral position
H/W error
Confirm the operation in the order
starting from the minimum system.
Explain the error symptom and get
advice from our sales representative
for the modules with failure.
Check the wiring and turn on the
NO
all power supplies.
NO
Is "MODE" LED
turned on?
Replace the power supply module,
NO
and check that the LED is ON.
Is "MODE" LED
NO
turned on?
NO
Connect the extension cable correctly.
NO
Is "MODE" LED
turned on?
"RESET" position
Set the RESET/ L.CLR switch in the
neutral position.
NO
Is "MODE" LED
turned on?
(Note) : Lit (green) : Normal
Lit (orange) : Installation mode mode written in ROM
6 - 16
YES
YES
YES
YES
Completion