Mitsubishi Electric MELDAS 600M Series Instruction Manual page 439

(2) Display area-related problems
The LCD screen is not output.
Power is not being supplied
to the backlight power
supply of the display area.
The connection from the
LCD display to the backlight
power supply is loose.
The LCD connector of the
HR121 Card and the LCD
connector of the HR273
Card are not connected
with an F090 cable.
The connection between
the HR273 Card and the
LCD display is loose.
The LCD display or the
backlight power supply and
HR121 Card are faulty.
The LCD screen is too dark or too light to see the characters.
The contrast voltage is not
adjusted correctly.
The LCD screen characters are light and difficult to read.
The LCD contrast has
deviated due to changes in
the ambient temperature.
The LCD screen is distorted, is out of synchronization, and characters are unreadable, etc.
The Card PC or HR121
Card is faulty.
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Cause
Cause
Cause
Cause
CAUTION
Do not apply voltages on the connector other than those indicated in this manual. Doing so
may lead to destruction or damage.
Incorrect connections may damage the devices, so connect the cables to the specified
connectors.
Do not connect or disconnect the connection cables between each unit while the power is ON.
Do not connect or disconnect any PCB while the power is ON.
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CHAPTER 3 MAINTENANCE
8. Fault Diagnosis and Action
Check whether the backlight power supply and the CF02 connector
of the control section power supply HR081 are connected with an
F082 cable.
Check whether the wiring from the LCD display is connected to the
backlight power supply.
Check whether the connection is with an F090 cable.
Check whether the wiring from the LCD display is connected to the
HR273 Card.
Check the cable connection. If it is normal, the individual modules
may be faulty.
Contact the nearest service center.
Turn the contrast voltage fine-adjustment (VR1) volume to the left
or right, to adjust the contrast of the HR273 Card mounted on the
back of the display. Then check that the screen is displayed
correctly.
Adjust the contrast on the display area CONTRAST
ADJUSTMENT screen.
Contact the nearest service center.
III – 53
Remedy
Remedy
Remedy
Remedy