Minolta Di 620 Manual page 37

<Control>
The PC Drum Charge corona wires are automatically cleaned under the follow-
ing conditions. The cleaning function is, however, disabled if the "Charge Wire
Cleaning" function of "System Input" available from the Tech. Rep. mode has
been set to "Off".
(1) A period of 500 msec. has elapsed after Power Switch S1 has been turned ON.
(2) The number of copies made exceeds 10K after S1 has been turned ON and 10
minutes elapse after the last copy cycle has been completed.
(3) A PC Drum Charge Corona malfunction, which has been detected, is reset.
(4) A misfeed/malfunction, which has been detected, is reset with a sheet of paper
remaining at the area near the Image Transfer/Paper Separator Corona.
CONTROL SIGNAL
M7
CONTROL SIGNAL UNBLOCKED
PC16
FORWARD
PJ10A-6A
PJ9A-14A
M-18
BACKWARD
Pulse Output
BLOCKED
H L
1155T22MCA
WIRING DIAGRAM
B-4
WIRING DIAGRAM
G-4