Essilor Instruments APH 550

34
5-20 LED for lighting near point chart does not light up
Main causes when LED for lighting near point chart does not light up:
・Failure of LED board assy for lighting right/ left eyeball
・Failure of motor control board assy or control board assy
・Failure of peripheral harnesses of head unit
NO
The LED for lighting the
near chart does not light up.
YES
Replace the motor control board assy.
OK
NO
Replace the control board assy.
Does the LED for lighting
the near point chart light up?
Are the peripheral harnesses
of the head unit normal?
NO
Replace the peripheral
harnesses of the head unit.
Replace the LED board assy for lighting the
right (left) side near point chart.
Does the LED for lighting
the near point chart light up?
YES
NO
Does the LED for lighting
the near point chart light up?
YES
YES