Roland VersaUV LEJ-640 Service Notes page 140

Disconnect the connector of the CN1001 on the AC Junction
7
Board and CN2 on the SW supply (5V), and connect them
with the special tool cable.
Special tool cable
1000007423 CABLE-ASSY,JIGU POWER LEC-540
Turn on the main power SW.
8
Put the black probe into CN51-GND pin (1~4 pin:black) and
9
the red probe into Vout pin (5~8 pin:orange).
Use the Digital Multi-Meter that can measure the di-
rect voltage.
Rotate the volume clockwise using the screwdriver to adjust
10
the output voltage value to +41V+0.1.
When the output voltage exceeds the +41.4V, 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.
CN2
SW Power Supply (5V)
< Rear side >
Main Power
GND pin (1~4pin:black)
Volume
3-66
Special Tool Cable
CN1001
AC Junction Board
Probe
Vout pin (5~8pin:orange)