JRC JCY-1900 Instruction Manual page 130

Chapter 6 Maintenance and Inspection
Trouble symptom
The LCD screen became dark.
94
Cause
The OPU's screen brightness
is becoming low.
The life of OPU's LCD is
approaching.
Actions to take
Adjust the screen brightness
by the rotary knob.
Check the OPU's operating
time. See "4.6.4 Checking the
replacement parts".
If the OPU's operating time is
over 50,000 hours, it is
necessary to replace the OPU.
Contact your sales
representative, our sales
department, nearest branch
office or sales office.