Roland VersaUV LEJ-640 Service Notes page 146

Rotate the volume clockwise using the screwdriver to adjust
10
the output voltage value to +27V+0.1.
When the output voltage exceeds the +27.6V, SW
Power Supply does not output the voltage by the
protection circuit on it.
In this case, SW Power Supply will output the volt-
age by rotating the volume counterclockwise.
When the protection circuit works, SW Power Sup-
ply may not output for a few minutes. Measure the
voltage some time later again.
Turn off the main power SW.
11
Connect the connector of CN204 on the DC Junction Board.
12
Turn on the main power SW.
13
Volume
< Rear side >
Main Power
DC Junction Board
< Rear side >
Main Power
3-72
CN204