Roland VersaCamm VS-640 Service Notes page 90

Turn on the Main Power SW, and then turn on the Sub Power
21
SW while pressing the left, right and down keys to enter the
Service Mode.
Perform [FUNCTION]>[CLEANING]>[POWERFUL CL.] once.
22
P e r f o r m [ S E RV I C E M O D E ] > [ S U B M E N U ] > [ C H O C K
23
CL]>[START]. Open and close the Chock Valve by following
the message.
ON
SERVICE MENU
SUB MENU
SUB MENU
CHOCK CL
CHOCK CL
START
3-17
+
FUNCTION
CLEANING
[ ]
CLEANING
POWERFUL CL.
ENTER
[ ]
[ ]
ENTER