Roland VersaUV LEJ-640 Service Notes page 287

Select [I/S MENU] > [I/S CONTROL] > [HEAD UP/
13
DOWN] > [MIDDLE], and press the [ENTER] key to set
the head height to [MIDDLE].
Turn off the sub power SW and main power SW.
14
Check the clearance between Media Thickness checking
15
Sensor and Bed is from 1.8mm to 2.1mm by using the
Thickness Gauge as shown in the below.
Confi rm that the 1.8mm gauge go through the
sensor.
SERVICE MENU
I/S MENU
I/S MENU
I/S CONTROL
I/S CONTROL
HEAD UP/DOWN
HEAD UP/DOWN
MIDDLE
Sub Power SW
Confi rm that the 2.1mm gauge hit the sensor.
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< Rear side >
Main Power SW
From 1.8mm to 2.1mm