IBM 1627 Manual page 26

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I
••
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"
~
Coil 1
n
From System
I
Drum Up
f\
t
•
I
LD 2 On
"
I
LD IOn
LD 2 On
r-;
(Ground)
50
psec Drum
"r! LD 3 On
Down Command
Drum Down
I
L/
~
Coil 2
On n
LD2
50
tJsec
Drum
I I
{Transistors
Up Command
"r-l
Drum Up
~
Off
n
1
LD IOn
-
LD 2 On
50 tJsec Corriage
LD 3 On
Left Command
.. r!
Carriage left
~ I I
~
,
Coil 3
I
r'\On
I I
LD3
(Transistors
I
Drum Up
~~
Off
50 tJsec Carriage
,III
Ri ght Command
Carriage Right (
LD IOn
)
J,
LD 3 On
LD I On
LD 2 On
-9
v -24 v
~
Figure 3-3. Drum Stepping Logic
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