IBM 727 Manual Of Instruction page 27

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• Systems
• 02E
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The tim e-delay point closes.
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05E
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75.10.02
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75.10.01
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When tape gets in either column (assume the left column), its flapper valve opens,
•
dropping R9.
up against its stop capstan, pinching the tape.
umn, dropping RIO. If tape were not pinched by dropping R9, the left column would
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take all the tape spilled from both reels.
05F
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•
05E
•
06G
•
06H
75.10.02
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06B
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05G
05E
-
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04D
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•
Sequence of
Operation
Manual start line R9BL, R10BL, R31-6
goes up.
Pick HD6, take- Time delay point
up mtr. start.
Start take-up mtr. HD6 pts.
1/2 power applied R4ALn/o, R12ALn/c,
to left stop clutch.
R7BL, time delay p t .,
R7AUn/o
The manual start line goes down (02E), pushing the left moving pulley
Drop R8, head R9BU, R10BU, head
cover not down. cover down m icro­
switch
Drop HD6, take- R8BU
up mtr. start.
Drop HD8; retract R8AUn/o
capstans.
Pick DP2, cap­ R8AUn/c
stan mtr.
Start capstan mtr. DP2 pts.
Drop capstan r e ­ HD8 pts.
tracting solenoid.
"Caps in" microswitch
Drop R7, caps,
in.
Drop DPI, re ­ R7AU
verse field.
Drop R4, clutch. R7AL
Conditions
Start to the moving coil
is incidental at this time.
With 1/2 power on both
stop clutches, the take-
up mtr. spills tape into
the columns.
The tape then goes into the other co l­
Head cover is down and
tape is in both columns.
Stop the take-up mtr.
Capstans start turning.
Capstans start to extend.
27
Remarks