Itel UD002441-1 Guide

MAGNETIC TAPE
WORD PROCESSOR
UD002441-1
FIELD ENGINEERING DIVISION
SEPT., 1972

This information is current as of September 1972.
ITEL
CORPORATION
FIELD ENGINEERING DIVISION
Technical Support Operations
10435 North Tantau Avenue
Cupertino, California 95014
Tel: [phone] TWX 910-338-0280
Printed in U.S.A. September 1972 Copyright(£) 1972

Chapter
1
2
3
4
2441-1
CONTENTS
GENERAL INFORMATION.
1. 1 Introduction
1. 2 Manual Content
1. 2. 1 Chapter 1, General Information.
1. 2.2 Chapter 2, Installation.
1. 2. 3 Chapter 3, Operation .
1. 2. 4 Chapter 4, Theory of Operation.
1. 2. 5 Chapter 5, Maintenance
1. 2. 6 Chapter 6, Checks and Adjustments
1. 2.7 Chapter 7, Error Analysis
1. 2.8 Chapter 8, Replacement Procedures
1. 2.9 Chapter 9, Diagrams
1. 3 System Description
1. 3.1 Microprocessor
1.3~2 Keyboard .
1. 3. 3
1. 3.4
1.4
Printer.
Ma gnetic Tape Transports
Specifications.
INSTA LLA TION .
2. 1
Unpacking.
2.1. 1 Unpacking the Typewriter Unit
2.1.2 Unpacking the Console Unit .
2. 2
System Interconnections
2. 3 Preoperational Checkout .
2.3.1 Power Supply Voltage Checkout.
2.3.2 System Diagnostic Checkout .
OPERATION .
3.1 Keys, Controls, Indicators and Alarms .
3.
1. 1 Basic Operation Keys .
3.
1. 2 Mode Keys .
3.
1. 3 Action Keys
3. 1. 4 Encoded Function Keys.
3. 1. 5 Console Controls and Indicators.
3. 1. 6 Alarms.
3.2 Operating Instructions .
THEORY
OF OPERA TION .
4. 1
Functional Description .
4. 2 Microprocessor.
4.2.1, Read Only Memory (ROM) Program
4.2.2 ROM Address Register.
Page
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1-1
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i

Chapter
5
6
ii
CONTENTS (CONT)
4.2.3 Return Address Register .
4.2.4 General Purpose (GP) and Main (M) Registers
4.2.5 Arithmetic Logic Unit (ALU) .
4. 3 Buffer I/O and Buffer Control
4.4
4.5
4.6
4.7
4.8
4.9
4.10
4.11
4.12
4.13
Tape Control
Write Encode .
Read Decode .
Tape Read/Write and Tape Read Only.
Motor Control.
Keyboard Interface .
Printer Interface.
Miscellaneous, Clock and IC .
Display Panel .
DC
Power Supplies
MAINTENANCE .
5. 1
Safety Precautions
5.2 Maintenance Philosophy
5.2.1 Objectives.
5.2.2 Basic Considerations
5. 3 Tools and Servicing Aids
5.3.1 Tools
5. 3.2 Test Equipment .
5.4 Power Supply Voltage
5.4.1 Voltage Levels
5.4.2 Logic Levels .
5.4.3 Use of Probes
CHECKS AND ADJUSTMENTS
6.1
General.
6.2 PDA Installation
6.3
ROM Test
·
6.4 Branch Test
.
6.5 Branch on Data Test
6.6
PDA Test
·
6. 7
G-Registers Test
6.8
H-Registers Test
6.9
ALU Test
·
6.10
Buffers Test
.
6.11
Data Bus Out (Lamp) Test.
6.12
Data Bus In (Thumbwheel) Test •
6.13
Keyboard Strobe Test
6. 14 Printer Test .
6.
15 Transport Tests . . .
6. 15.1 Run Forward Normal Test
Page
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5-1
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5-6
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5-7
6-1
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Chapter
7
8
6.15.2
6.15.3
6.15.4
6.15.5
6.15.6
CONTENTS (CONT)
Run Reverse Normal Test
Run Forward Fast Test
Run Reverse Fast Test .
Speed Tests .
Normal Write Forward Test
ERROR ANALYSIS .
7.1 General.
7.2 Recommended Troubleshooting Sequence.
REPLACEMENT PROCEDURES
8.1 General.
8. 2 Printer Removal and Installation
8.3 Keyboard Removal and Installation.
8.4 Transport Removal and Installation
8.4. 1 Head Assembly Removal and Installation.
8.4.2 Motor Removal and Installation.
Page
6-20
6-21
6-22
6-23
6-26
7-1
7-1
7-1
8-1
8-1
8-1
8-1
8-2
8-4
8-6
8.4.3
8.4.4
8.4.5
Lock Solenoid Removal and Installation 8-6
BOT/EOT Sensor Assembly Removal and Installation. 8-7
Cassette In Place Switch and File Protect Switch Removal
and Installation 8-8
9 DIAGRAMS
9. 1
General.
9.2 System Wire List
ILLUSTRATIONS
Figure
1-1 Magnetic Tape Word Processor.
1-2 Simplified System Block Diagram
2-1 Typewriter Unit Packaging
2-2 Console Unit Packaging
2-3 Typewriter Cover Removal
2-4 System Interconnections
2-5 Power Supply Interconnect Panel
3-1 Basic Operation Keys
3-2 Mode Keys.
3-3 Action Keys
3-4 Encoded Function Keys.
3-5 Console Controls and Indicators.
4-1 Console, Right-Hand Interior View.
4-2 Detailed System Block Diagram.
4-3 K-Page Memory Structure
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9-1
9-1
9-24
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iii

Figure
4-4
4-5
4-6
4-7
4-8
4-9
5-1
6-1
Table
ILLUSTRATIONS (CONT)
Major-Page Memory Structure
12-Bit Address Word Format
ROM Address Register
Bi-Phase Serial Data
Motor Control Block Diagram
System Clock Timing
,
PDA Controls and Indicators,
PDA Installation
Schematics:
Printer Interface (socket 1)
Keyboard Interface (socket 3),
Miscellaneous, Clock, and IC (socket 4)
ROM Program (sockets 5, 6, 7, and 8)
ROM Address Register (socket 9) ,
Return Address Register (socket 10) ,
Main and General Purpose Register (socket 11),
Arithmetic Logic Unit (socket 12) ,
Buffer I/O (Read Only & Read/Write) (sockets 13 and 15) .
Buffer Control (Read Only & Read/Write) (sockets 14 and 16)
Tape Control (Read/Write & Read Only) (sockets 17 and 20)
Read Decode (Read/Write & Read Only) (sockets 18 and 21).
Write Encode (Read/Write) (socket 19)
Motor Control (sockets R/WJ1 and ROJl).
Cassette Heat Sink ,
Tape Read/Write, Tape Read Only (sockets R/WJ2 and ROJ2)
Display Panel
DC Power Supply
Keyboard Logic .
PDA ROM and Controls
PDA Switch and Indicator.
TABLES
1-1 Dual Station MTWP Specifications .
2-1 Power Supply Voltages.
3-1 Encoded Function Codes
3-2 Encoded Function Keys.
iv
Page
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4-7
4-10
4-11
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5-4
6-1
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9-21/9-22
9-23
Page
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2441-1

TABLES (CONT)
Table
4-1 Card Cage PWA's
4-2 Other Console PWA's
6-1 PDA Routine Addresses
6-2 Error Addresses
6-3 ROM Tests.
6-4 Branch Tests .
6-5 Branch on Data Test "Error Addresses" .
6-6 ALU Test "Error Addresses"
6-7 Buffers Test "Error Addresses"
6-8 Data Bus Out (Lamp) Test Sequence
6-9 Transport Tests Error Analysis
6-10 Speed Conversions .
6-11 Normal Write Forward "Error Addresses"
7-1 PWA's Affected According to Priority.
7 -2 Troubleshooting Chart .
8-1 Transport Power Connections
8-2 Head Assembly Connections .
8-3 BOT/EaT Sensor Assembly Connections.
9-1 Diagrams.
2441-1
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v

/

1.1 INTRODUCTION
CHAPTER 1
GENERAL INFORMATION
This manual provides installation, operation, and service instructions for both the
single and dual station Magnetic Tape Word Processor (MTWP), shown in Figure 1-1.
Both systems combine the functions of a Microprocesflor, an electronic keyboard and
printer, and one (single station) or two (dual station) magnetic tape transports to
form an automatic writing system. The Microprocessor and magnetic tape trans-
ports are contained in a compact console. The keyboard and printer are housed in an
attractive case suitable for secretarial use.
Typewriter
Console
Figure 1-1. Magnetic Tape Word Processor
1.2 MANUAL CONTENT
This Magnetic Tape Word Processor Operation, Service, and Diagrams Manual is div-
ided into nine chapters. The following paragraphs briefly describe the contents of each
chapter.
1.2.1 Chapter 1, General Information
This chapter provides introductory material, a description of manual contents, an equip-
ment description, and the specifications for the system.
2441-1
1-1
\

1.2.2 Chapter 2, Installation
Chapter 2 discusses unpacking, inspection, and the interconnections required when
installing a system. A preoperation checks and adjustments procedure is also pro-
vided in this chapter to verify that the system is operating properly.
1.2.3 Chapter 3, Operation
Chapter 3 identifies and describes the function of each key on the keyboard, control
and indicator on the console, and system alarm.
1.2.4 Chapter 4, Theory of Operation
The theory of operation is provided in this chapter. Block diagrams, simplified drawings,
and timing diagrams are used, where necessary, to support the text.
1.2.5 Chapter 5, Maintenance
Chapter 5 outlines safety precautions, presents maintenance philosophy, and lists
required special tools and test equipment.
1.2.6 Chapter 6, Checks and Adjustments
Electrical and mechanical checks and adjustments are contained in Chapter 6.
1.2.7 Chapter 7, Error Analysis
This chapter contains information designed to assist in troubleshooting.
1.2.8 Chapter 8, Replacement Procedures
Chapter 8 presents removal and installation procedures.
1.2.9 Chapter 9, Diagrams
This chapter contains the schematic diagrams for the system as well as those for the
Programmed Diagnostic Aid (PDA). The system wire list is also included.
1.3 SYSTEM DESCRIPTION
The ITEL single or dual station Magnetic Tape Word Processor, (MTWP) is an elec-
tronic system for automatic writing. The functions of both are identical; therefore,
only the dual station system will be discussed. The dual station does, however, extend
the capabilities of the single station system. The major components of the system are:
• A Microprocessor.
• A full duplex electronic keyboard.
1-2 2441-1

• An electronic printer.
• Two magnetic tape transports.
Figure 1-2 provides a simplified block diagram of the system.
TYPEWRITER CONSOLE
1-------1 ~----------l
~~ II '
, , I
.. alT DATA FLOW
TYPOWRITER INTERFACE k::j
MICROPROCESSOR
Ii'
, , I
- __ ~ L________ j
r-----
MAGNETIC TAPE
TRANSPORTS
----: i---
I.
, I
! i BUFFERS
DUAC ... "ON ovm. ! i
___ ~ L __ _
LSlNGLE STATlDN SYSTEM
-----
16BtT INSTRU~TlON WORD BUS
---l
i
I
i
-~
Figure 1-2. Simplified System Block Diagram
1.3.1 Microprocessor
The
Microprocessor has the capability of storing 4096 sixteen-bit instruction words.
These sixteen-bit instruction words are used to control the operation of the system.
It also has an eight-bit parallel data bus (DB.0 through DB7). Any information which
is processed is processed on this data bus. The data bus links the Microprocessor,
keyboard, I?rinter, and both magnetic tape transports together into one unit. Infor-
mation is gated on and off the data bus by the instruction words stored in the Read Only
Memory portion of the Microprocessor.
1.3.2 Keyboard
The keyboard used in this system is a full duplex electronic keyboard. Through the use
of this type of keyboard, signals are routed through the Microprocessor to the printer,
rather than directly to the printer. All system functions are controlled by the operator
from the keyboard. A standard 44-key typewriter array inputs information into the
system during normal typing operations. Certain keys are lighted, when depressed,
to indicate the present operation. These lighted keys also monitor the Microprocessor
2441-1
1-3

and flash to display input, output, and system error conditions. The function of each
key on the keyboard and each alarm is discussed in detail in Chapter 3 of this manual.
1.3.3 Printer
The printer, used as the output device for the system, is of a serial type (prints a single
character at a time). It operates at speeds up to 30 characters per second on general
text such as letters, specifications, contracts, etc. The 15-inch long platen indexes at
six lines per inch (single space) or three lines per inch (double space).
There are three basic printer motions; carrier, print wheel (character), and paper
feed. Each motion is controlled by the system through the printer interface. These
controls are sent down the eleven data lines. The data lines transmit either the 7-bit
ASCII code for the next character to be printed, an ii-bit word which specifies the
direction and number of printing spaces to be moved by the carrier (in multiples of
1/60 of an inch), or an ll-bit word which specifies the direction and number of vertical
line spaces (indexes) that the paper is to be moved by the paper feed (in multiples of
1/48 of an inch).
Character sets are provided in the form of an 88-character print wheel. These print
wheels are easily interchanged by the operator.
Two types of ribbon cartridges are available and these too are easily interchangeable
by the operator. The styles available include single reusable fabric and a single-use
carbon.
1.3.4 Magnetic Tape Transports
The dual station system has two circulating-type, live-memory, MOS buffers which
store a single line of typewritten information. This information, in the form of an
8-bit word on the data bus, comes from either the keyboard or magnetic tape storage
enroute to the printer. A single line of typewritten information can contain up to 256
of
these 8-bit characters. Information from the keyboard is stored, a line at a time,
in the buffer and then outputed, a line at a time, onto the read/write (R/W) magnetic
tape.
The magnetic tape transports are capable of unidirectionally reading and writing at
20 inches per second and bidirectionally searching at 70 inches per second. Naturally,
the read only magnetic tape transport (dual station system only) is only capable of uni-
directionally reading at 20 inches per second and bidirectionally searching at 70 inches
per second. The functions of each magnetic tape transport, like any other functions of
the system, are controlled by the operator from the keyboard.
1-4
2441-1

1.4 SPECIFICATIONS
The specifications for the dual station Magnetic Tape Word Processor (MTWP) are
listed in Table 1-1.
Table 1.1. Dual Station MTWP Specifications
CHARACTERISTICS
MICROPROCESSOR:
Type of storage
Storage capacity
Instruction cycle time
Memory access time
KEYBOARD:
Typewriter array
Lighted Function keys
Non-Lighted Function keys
Repeat keys
Maximum input rate
PRINTER:
2441-1
Number of characters
Print speed
Print line length
Line spacing
Print quality
Paper feed
SPECIFICA TIONS
Read Only Memory (ROM)
65,536 (4096 16-bit instruction
words)
2 J.1.s
1 J.1.s maximum
44 keys
12
4
Hyphen, backspace, forward
index, reverse index, X, car-
rier return, space bar and
period.
500 characters per second
88
>30 characters per second
(on general text)
132 characters at 10 per inch
(10-pitch) or 158 characters at
12 per inch (12-pitch)
6 per inch (single spaced) or 3
per inch (double spaced)
Standard typewriter
15-inch platen fed
1-5

Table 1-1. Dual Station MTWP Specifications (continued)
1-6
.. CHARACTERISTICS
Copy capacity
Ribbon type
Print element
MAGNETIC TAPE TRANSPORTS:
Read/Write speed
Search speed
Start time
Stop time
Start distance
Stop distance
MAGNETIC CASSETTE:
Type
Tape
Capacity
Storage capacity
Maximum search or rewind
time
ENVIRONMENTAL:
Temperature range
Humidity range
POWER:
Primary power requirement
DC supply voltages (developed
by internal supplies)
SPECIFICA TIONS
Original plus· five carbons
Cartridge loaded (reusable
fabric or single-use carbon)
Interchangeable print wheel
20 ips (average)
70 ips (average)
50 ± 10 ms @ 20 ips
50 ± 10 ms @ 20 ips
0.5 ± O. I-inch @ 20 ips
O. 5 ± O. I-inch @ 20 ips
Modified Philips
Computer grade
300,150 and 75 feet
50K, 25K, and 12K char-
acters
51, 26 and 13 seconds
8% min. to 80% max. (max-
imum wet bulb temp. 80°F)
115 VAC ± 10%@ 15 A
+24V ± 2. 6V
+15V ±
O. 75V
+5.12V ± O. 05V
-5V ± O. 25V
-9V ± O. 45V
-15V ± O. 75V
2441-1

Table 1-1. Dual Station MTWP Specifications (continued)
CHARACTERISTICS
SPECIFICA TIONS
PHYSICAL:
Console service openings Both side panels
Typewriter service openings
Removable cover and access
panel
Console dimensions
Height
30.5 inches
Width 12 inches
Depth
22 inches
Weight < 140 lbs.
Mounting
Leveler feet
Typewriter dimensions
Height
8.45 inches
Width
22.5 inches
Depth
19.63 inches
Weight <50 lbs.
Connecting cables
2; AC power and typewriter
to console
2441-1
1-7

CHAPTER 2
INSTALLATION
2.1 UNPACKING
The Magnetic Tape Word Processor is inspected for mechanical and electrical operation
prior to shipment. Individual units that comprise part of the system (the typewriter and
console) are separately packaged into two containers. Perform the following unpacking
procedures to attain optimum system performance. Before removing units from their
containers, examine each for broken bands, crushed walls, or other signs of damage.
If damage is evident, contact the transportation company involved before removing the
units from their packaging. Original packaging material should be retained to facilitate
any return shipment.
2.1.1 Unpacking the Typewriter Unit
Use the following procedure to remove the typewriter unit from its container. See
Figure 2-1.
1. Position the packaged typewriter unit on the floor near the desk or typing
stand where it is to be used.
2. Remove the tape securing the top flaps of the outer container.
3. Remove the tape securing the top flaps of the inner container.
4. Remove the plastic sheet from typewriter unit.
5. Remove the typewriter from the inner container and set it into position
on desk or typing stand.
6. Visually examine the surfaces of the typewriter unit to ensure that no
physical damage has resulted.
7. Retain all packaging materials for possible future use.
2.1.2 Unpacking the Console Unit
Use the following procedure to remove the console unit from its container. See Figure 2-2.
2441-1
1. Using a hand truck, transport the console unit to a location near a desk
or typing stand where it will be used.
2. Remove the two bands wrapped around the container.
3. Lift the container up and away from the console unit.
4. Break down one of the end flaps on the telescoping tray into which the
console unit is set.
5. Slide the console unit from the telescoping tray and set it in its operating
pOSition.
2-1

2-2
PLASTIC SH£E:T
/
Figure 2-1. Typewriter Unit Packaging
BANDS
CONTAINER
TELESCOPING
TRAY
Figure 2-2. Console Unit Packaging
2441-1