IBM 727, Руководство по инструкции

Страница: 87 / 163

R8, Head cover not
down (09. 05)
8AU (09.06) N/C
N/O
8BU (09.05)
8BL (09.02)
R9, 10, Tape out of
columns (09. 05)
9, 10AU (09.05)
9, 10AL (09.04)
9, 10BU (09.05)
N/C
N/O
9, 10BL (09.02)
R l l , 22, Unload (09.05)
11AU (09. 05)
U A L (09. 04)
11BU (09.06)
11BL (09.06)
22-1 (09.01)
22-2 (09.01)
22-3 (09.02)
22-4 (09.02) N/C
22-5 (09.02)
Pick R8 when the head cover is not all the way down. Hold
it until the head cover is all the way down and tape is in both
columns.
This runs the capstan motor only when using the capstans
or when moving the capstans in or out.
This allows the capstans to extend (drop HD8) during load
rewind when the head cover is all the way down and tape is
in both columns.
When lowering tape into the columns during load-rewind,
stop the take-up motor when the holding conditions on R8
are satisfied.
This allows R34-1 to have complete control of the manual
start line when the head cover gets down and tape gets in
both columns.
R9 is controlled by the left column microswitch; R10, by
the right. When vacuum is up, these relays are picked only
when tape is out of their respective columns.
These insure that tape is out of both columns before: (a)stop­
ping the vacuum motor when unloading (LP R26), (b) starting
the rewind motor for high-speed rewind (DP3, R12).
They drop the run relays if tape should break during any opera­
tion where tape is being moved by the drive capstans.
These prevent braking the left reel while slowing down from
a high speed rewind.
These hold R8 until tape gets in both columns.
These drop the manual stop line when tape gets into either
column. This occu rs during load rewind when tape is being
low ered. It insures that tape will get into both columns.
This is picked when R21, unload is up.
When the head cover is up and tape is out of both colum ns,
one of two possible conditions exists: (a) unload is completed,
(b) it is ready to start high speed m otor, if R l l is picked,
the unload button has been pressed, so example (a) applies.
While unloading, keep the run relays up until the operation
is completed.
Pick R13. (See R13.)
Retract the capstans when an unload operation has been
started.
Place all three photo lights in series with R14 while un­
loaded. Thus in order to start a load rewind operation from
an unloaded status, all three photo lights must be conducting,
i. e . , R14 must be picked.
This is protection in case the read-w rite status trigger
filament should burn out. While unloaded, and while unload­
ing, the write heads and erase heads cannot conduct.
Put the moving coil in a start status when unloaded for ease
in changing re e ls.
Drop R33 and R34 to stop tape in case the unload button is
pressed while the machine is rewinding at low speed.
Drop the load point relay.
87