Canon NP-70 Service Manual page 75

NP -70
3-35
3.3-7
SECOND FEED INTERVAL
"The period of time during which capacitor C16 discharges (8.0 seconds at the end of a copy-
ing operation" is designated the Second Feed Interval. This period is provided, for the con-
venience of the operator, so that the copier is capable of resuming operations for a short du-
ration after the completion of the copy cycle started previously (see flowchart STEP 14CH )
to STEP 20CH OR STEP I SCF to STEPI7CF ).
Should the COPY button be depressed after the start of the second feed interval (see flowchart
STEP 14CH , or STEP 15CF ), a "Copying Cycle" will begin at the next MS lA pulse. This
is because the copier is returned to a condition similar to that existing between flowchart
STEP 2C
operation.
and ;that is, capacitor C16 is charged and the K7 delay hold is in
3.3-8 NEUTRAL TIME
As the copier completes its operations prior to returning to the STANDBY condition, a period
occurs when the copier is physically and electrically prepared for the cessation of operation.
This period of "copier preparation for STANDBY between the complete discharging of capaci-
tor C16 and the stopping of the drum" is designated Neutral Time.
Due to slight differences in operation timing, the duration of neutral time will vary according
to the type of operation previously performed. This timing is as follows:
1) When the initial starting operations are performed, and the COPY button is not pressed, the
time will be the last 4.0 seconds. This period is shown in the~START~flowchart as
STEP 7S (time - 25.0 seconds through 29.0 seconds).
STEP SS to
2)
When "half-size" copying operations are performed, the time will be the last 3.7 seconds. This
period is shown in the ~COPY~ flowchart as STEP 20CH to STEP 22CH (time - 16.5 seconds
through 20.2 seconds).
3)
When "full-size" copying operations are performed, the time will be the last 4.7 seconds. This
period is shown in the COPY ~ flowchart as
through 24.2 seconds).
3.3-9 STANDBY
STEP 17CF to STEP 19CF (time -19.5 seconds
After completing all operation steps in eigher the START) or the ~COPY~flowcharts, the
copier goes to an inactive state known as STANDBY. In this state, all circuits are set for
resuming copying operations upon command (i. e., depressing the COPY button). The only
active components within the copier during standby are the following.
1)
The heater and its control circuit operate to maintain fixing temperatures for the next ope-
ration.
STEP 4C
© CANON INC. Second Printing-June, 1974