IBM 727 Manual Of Instruction page 126

R27, GO status
(76.09.02)
27-1 (76.09.03)
DPI, Take-up motor
reverse (76. 09. 08)
DPI A & B
(76.10.02)
DC fuse bail switches
(76.09.01)
Door interlock switch
(76.09.01)
Bellows switch
(76.09.01)
Right and left capstan-
in switches (76. 09.02)
Time delay switch
(76.09.02)
C .E . switch
(76.09.02)
Left and right capstan
out switches (76.09.04)
Flapper switches right
and left (76.09.06)
Unload switch
(76.09.06)
Load-rewind switch
(76.09.06)
Arm switch (76.09.08)
Head-down switch
(76.09.08)
Reset switch (76. 09.08) Push button switch which drops R13 when depressed.
Picks at any time tape is to be fed by the drive capstans.
Brings up "manual sta rt."
Picks during load-rewind and high-speed rewind operations.
Switches two phases to the take-up motor allowing it to run
in reverse.
Points are normally as shown on 76. 09. 01. When the fuse
bail is moved by a fuse plunger, the points transfer.
The points are shown with the door open. When the door is
closed, the points transfer to supply +48 to R l, HD1, HD2,
and HD3.
Points close when vacuum is up.
The shown points are normally open contacts of m icro­
switches. When the capstans are in, the contacts are closed.
Points open five seconds after the timer motor starts.
Manually operated single-pole, three-position switch. When
the switch is set to forward go, R27 is picked.
set to backward go, R27 and the manual reverse line comes
up.
The shown points are normally closed points of m icro­
switches. When the capstans are out, the points are open.
The flapper switches are m ercury switches.
is up and tape is out of the columns, the shown points are
closed.
Manually operated push button.
latch pick R15.
Manually operated push button. Applies +48 volts to the
manual load-rewind line which ANDT s with read status
(76.08) causing R21 to pick.
Operates from the arm, sensing the amount of tape on the
right-hand reel. Points close when 1/2 inch of tape is on
the reel.
Points shown are normally closed microswitch points.
Open when the head is down.
126
When it is
When vacuum
Furnishes a circuit to