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727
IBM 727 Manuals
Manuals and User Guides for IBM 727. We have
1
IBM 727 manual available for free PDF download: Manual Of Instruction
IBM 727 Manual Of Instruction (163 pages)
Magnetic tape unit and tester, electronic data-processing machines
Brand:
IBM
| Category:
Test Equipment
| Size: 26.92 MB
Table of Contents
Table of Contents
3
Introduction
7
Machine Specifications
8
Tape Drive
8
Tape
8
Humidity Considerations
8
Capacity and Speed
9
Principles of Storing Information
10
Magnetic Theory
10
NRZI System
10
Physical Description
12
Tape Motion
12
Moving Coil Assembly
12
Split Idlers- Tape Alignment
13
Head Assembly
13
Reel Drive Clutches
15
4. 6 Vacuum Columns and Vacuum-Operated Switches
16
Motor Drive
17
Time Delay
17
Capstan Retracting Mechanism
17
Head-Raising Mechanism
18
Reel Door Interlock
18
File Protection
19
Power Considerations
19
Machine Reel Sensing Arm
19
Panel Buttons and Lights
20
(Figure 5)
20
Tape Handling
21
Load-Rewind Operation
23
Initial Conditions
23
Motion Control
30
Moving Coil Circuit
30
Forward-Reverse Control
30
Unload Operation
31
High-Speed Rewind
33
Miscellaneous
36
Charts
36
Select and Ready 75. 01
36
Read-Write Status
36
Tape Indicator
37
Tape Break Indication 75.03
37
Starting from Load Point 75. 04
37
Start, Stop, and Reverse Control
37
Read Pre-Amplifier
38
Writing on Tape (Only One Bit Position Considered)
38
Write Echo
39
Writing a Check Character (LRCC)
39
Erasing
39
Rewind 75.08
39
File Protection
40
Forward and Reverse Switch
40
Machine Ready 75. 09. 03
40
Reset 75.09.04
40
Reel Arm Latch
40
Resume of Lines Entering and Leaving Tape Units
41
Sources of Trouble
43
Signal Drop out
43
Noise Pulses
43
Skew
43
Service Aids
46
Fuse Replacement
46
Erase Head Polarity and Stopping Distance
46
Moving Coil Circuitry
47
Checking for Reversal Failures
47
Removal, Assembly and Adjustment Procedures
48
Removal of Head Assembly (P/N 333072)
48
Adjustment of Head Assembly (Figure 18)
48
Headwear
50
Removal and Adjustment of Tape Cleaner
50
Drive Clutch Assembly
51
Vacuum Unit
52
Drive Capstan Mechanism
54
Moving Coil Unit
55
Miscellaneous Adjustments
59
Lubrication Specifications
62
Unit
63
Preventive Maintenance
63
Type 727 Relay Wiring Diagram
65
Tape Drive Tester
79
General
79
Purpose of Switches and Hubs
79
Oper at Ions
81
Test Procedures
83
Purpose of Relays
85
Tape Drive Cem Listing
91
Introduction
117
Mechanical Principles
117
Electronic Circuits
118
Relay Circuits
119
Tape Motion under Calculator Control
120
High-Speed Rewind
121
Unload
121
Purpose of Relay Points
122
Adjustments
128
Capstan in and Capstan out Sensing Switches
128
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