IBM 727 Manual Of Instruction page 26

Systems Sequence of
Operation
75.10.02
Time delay mtr.
starts.
05E Pick DPI, take
up mtr. reverse.
06G Pick HD8, retract
capstans.
06B Energize capstan
retracting solenoid.
06B Energize magnet
latch.
Oil Pick R35, R36,
rewind status.
Oil Hold R35, R36.
02E Drop the manual
start line.
The above operations all take place within a fraction of a second after the load-
rewind button is pressed.
When sufficient vacuum is obtained, the no-vacuum switch and the flapper valve
switches transfer causing the following action:
04B Pick R l, R18,
run.
05G Pick R9, RIO,
tape out of
columns.
06H Pick HD1, phase
1 and HD2, phase
.
2
04D Pick R4, clutch.
75.10.01 1/2 power applied
to right stop clutch.
Conditions
HD7 pt.
R6BLn/o
R6AUn/o
HD8 pt.
R6AL
R31-4n/o
R 3 5 -ln /o
R6BUn/c
No vacuum switch
Flapper valve m icro­
switches
RIAL
R1BL, R7AL, R 21-2n/c
and R2 hold circuit.
R4BLn/o
26
Remarks
Prepare to run take-up
mtr. in reverse.
Prepart to extend cap­
stans.
Hold until load point is
reached.
Reel drive motors start.