HP 7901A Operating And Service Manual page 91

Table of Contents

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Maintenance
--------
NOTES
1.
GATES U310B AND U310D CAN BE STRAPPED FOR
VELOCITY DECODE
VELOCITY CURVE GENERATOR
8,12,16,24 OR 32 SECTOR OPERATION. GATES ARE
ILLUSTRATED STRAPPED FOR 24 SECTOR PULSE OPE RATION.
~RENT
ADDRESS
REGISTER
U22
.3... .......
~
....... .
I
9 J!..!lC 8
10
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SUBl
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SUB 2
5 UI3B 6
RIl
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R2
CRI
316K
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UI2C 8
10
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CR2
180K
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17
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16
16
SUB32
SUB 64
SUB 128
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d . . . . . . .
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. . . . . . . . . . . , , " . . . . , . . . . . .
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13 U11D 11
+5V
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R23
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1000
CR10
100
R14
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14.7K
R24
17.8K
R25
38.3K
A26
51.1K
R27
:i1.1K
R28
5L1K
CR11
CR12
eR13
CR14
RI5
121
-12V
R16
17B
R17
196
RIB
133
R19
215
SECTOR SE LEeT OPTIONS
JUMPER CONNECTIONS
TO:
SECTOR
U310B
U310D
4
4T04
4 TO 13
VC TO 5
VC TO 12
8
BT05
B TO 13
VCT04
VC TO 12
12
8T05
8 TO 12
4T04
4 TO 13
16
16TO 4
16TO 13
VCT05
VC TO 12
20
16TO 4
16 TO 13
4 TO 5
4 TO 12
24
AS SHOWN
....................................................................................................
~
2 U11A
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DESTINATION
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_______ --.J
GTO 12
Figure 5-35. Sector Cylinder PC Assembly All,
Schematic Diagram
5-49

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