C O N T E N T S
727 MAGNETIC TAPE UNIT AND TESTER, MODELS I AND II
Page
Page
1.0 INTRODUCTION
7
11.0 MISCELLANEOUS
36
11.1 Charts
36
2 .0 MACHINE SPECIFICATIONS
8
11.2 Select and Ready 75. 01
36
2 .1 Tape Drive
8
11.3 Read-Write Status 75.02
36
2.2 Tape
8
11.4 Tape Indicator 75.03
37
2.3 Humidity Considerations
8
11. 5 Tape Break Indication
2 .4 Capacity and Speed
9
75.03
37
11.6 Starting from Load Point
3 .0 PRINCIPLES OF STORING
75.04
37
INFORMATION
10
11.7 Start, Stop, and Reverse
3 .1 Magnetic Theory
10
Control 75. 05. 01
37
3.2 NRZI System
10
11.8 Read Pre-A m plifier 75.06
11. 9 Writing on Tape (Only One
38
4.0 PHYSICAL DESCRIPTION
12
Bit Position Considered)
38
4 .1 Tape Motion
12
11.10 Write Echo
39
4. 2 Moving Coil Assembly
12
11.11 Writing a Check Character
4 .3 Split Idlers— Tape Align
(LRCC)
39
ment
13
11.12 Erasing
39
4 .4 Head Assembly
13
11.13 Rewind 75. 08
39
4. 5 Reel Drive Clutches
15
11.14 File Protection
40
4. 6 Vacuum Columns and Vacuum
11.15 Forward and Reverse
Operated Switches
16
Switch
40
4. 7 Motor Drive
17
11.16 Machine Ready 75.09.03
40
4. 8 Time Delay
17
11.17 Reset 75.09.04
40
4. 9 Capstan Retracting Mecha
11.18 Reel Arm Latch
40
nism
17
4.10 Head-Raising Mechanism
18
12.0 RESUME OF LINES ENTERING
4.11 Reel Door Interlock
18
AND LEAVING TAPE UNITS 41
4.12 File Protection
19
4.13 Power Considerations
19
13. 0 SOURCES OF TROUBLE
43
4.14 Machine Reel Sensing Arm
19
13.1 Signal Drop Out
43
13.2 Noise Pulses
43
5.0 PANEL BUTTONS AND LIGHTS
13.3 Skew
43
(FIGURE 5)
20
14. 0 SERVICE AIDS
46
6.0 TAPE HANDLING
21
14.1 Fuse Replacement
14.2 Erase Head Polarity and
46
7.0 LOAD-REWIND OPERATION
23
Stopping Distance
46
7.1 Initial Conditions
23
14.3 Moving Coil Circuitry
14.4 Checking for Reversal
47
8.0 MOTION CONTROL
30
Failures
47
801 Moving Coil Circuit
30
8.2 Forw ard-Reverse Control
30
15.0 REMOVAL, ASSEMBLY
AND ADJUSTMENT
9.0 UNLOAD OPERATION
31
PROCEDURES
48
15.1 Removal of Head Assembly
10.0 HIGH-SPEED REWIND
33
(P/N 333072)
48
Summary of Contents for 727
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Page 67: ...co Q...
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Page 69: ...To Fuse 13 48V...
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Page 73: ...o IC To Fuse 13 48V...
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Page 93: ...039 0035 FIGURE 1 BIT PO SITIO N S O N TAPE CURRENT GENERATOR FIGURE 3c...
Page 95: ...w PATH OF TAPE THROUGH MACHINE FIGURE 6...
Page 97: ...SPLIT IDLER ASSEMBLY FIGURE 8...
Page 98: ......
Page 99: ...CLUTCH HOUSING POWDERED IRON AND GRAPHITE MIXTURE FIGURE 10 MAGNETIC CLUTCH...
Page 100: ...PUSH ROD DIAPHRAGM VACUUM COLUMN SWITCHES FIGURE II...
Page 101: ...BACKWARD MOTOR CAPSTAN MOTOR FORWARD MOTOR...
Page 102: ...LATCH FIGURE f3...
Page 103: ...140 140...
Page 107: ...FIGURE 18 HEAD ASSEMBLY A DJUSTM ENTS...
Page 108: ...TAPE C LEA N ER FIG URE 19...
Page 109: ...VACUUM COLUMN ADJUSTMENT FIG U RE 22...
Page 110: ...DRIVE MOTOR PULLEY CAPSTAN DRIVE BELT TENSION FIGURE 23 REAR VIEW S...
Page 113: ...CONTROL UNIT TAPE DRIVE TESTER FIGURE 28 TAPE DRIVE TESTER CO NN EC TIO N S...
Page 116: ...FIGURE 32 HIGH SPEED REWIND...
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