Centronics 101AL User manual

TECHNICAL
MIZAINUZATL
MODEL 101AL PRINTER
CENTRONICS
ara OC eaie! OC
CENTRONAICS
data computer corp.
HUDSON, NEW HAMPSHIRE 03051
Centronics
No.
37400050
Rev.C
TELEPHONE
(603)
8383
ts
0111
APRIL 1975

CENTRONICS
centronics data computer corp.
hudson, n.h. 0305!
telephone (603) 883-Oill
eastern region: [phone] (mass.)
central region: [phone] (ohio)
western region: [phone] (calif.) ;
© Copyright Centronics Data Computer Corp.
centronics data computer (canada) Itd.
mississauga, ontario [phone] All rights reserved.
derteariiettn a aeaso melee Patents Pending in U.S.A. and Other Countries
brussels, belgium [phone] (Printed in U.S.A. 4/75)

‘TECHNICAL
MANUAL
MODEL 101AL PRINTER
APRIL 1975
THE INFORMATION CONTAINED HEREIN IS
PROPRIETARY AND IS NOT TO BE RELEASED
OR REPRODUCED WITHOUT WRITTEN PER—
MISSION OF CENTRONICS data computer corp.
CENTRONICS
data computer corp.
HUDSON,
NEW
HAMPSHIRE
03051
TELEPHONE
(603)
883
-
0111

TABLE OF CONTENTS
SECTION 1
INTRODUCTION
Section
1.1 GENERAL DESCRIPTION... ... 1... 1 1 we ee ee we tw et
1.2 LOGIC FLOW DIAGRAM ........... 2 ee ee eevee ee
1.3. PRINTER OPERATION. ....... ee ee ew we ee
1.3.1 Character Printing ........+4+464-0+6006-8 eee
1.3.2 Paper Movement ...... 2. 2. 2 6 ee ee ee ew ws
1.3.3 Special Functions. . .... 1... 2 ee eww ee wes
1.4 SYSTEM FEATURES... .. eee ee ee ee ee ee ne
1.4.1 Features, Standard & Optional Specification Summary. . ,
1.4.2
Specification
Summary
«+
+
+
+
+
eee
ee
ee
ee es
1.5 PHYSICAL DESCRIPTION - +++ +++ +e: ee,
SECTIONS 2 & 3
INSTALLATION AND OPERATION
SITE PREPARATION. . 2... 2 2 1 2 ee we ww we ee we
SHIPPING CRATE. . 2. 1. 1 1 6 ww we ww ew ee ww we te ew
PAPER GUIDE AND STACKER ASSEMBLY. ~~... 1 1 ee ee ee eee
SECTION 4
THEORY OF OPERATION
4,1 INTRODUCTION. . 2. 1. 2 1 1 2 www we ew we ww te ee ee
4.2 BASIC TIMING. . 2. 2. 1 1 ew we we ww we te ee we ee te
4.3. INITIALIZING THE PRINTER. . . 2. 1. 7 2 we ew ee we we wee
4.3.1 Prime. ..... 2... eee nee ee eke ke kas
4.3.2 Select .......2 06.2 6 «© © © © © © © ee we ee th ws
Rev. A

TABLE OF CONTENTS (cont'd)
Section Page
4.4 DATA INPUT. ........... ee ee ew we ee ew 4-6
4.4.1 Data Input Timing. ........2.2.2.2.208080c86-.8 4~6
4.4.2 Busy... 2. 2. 2. ew ew ew we ww te ww he we 4-9
4.4.3. Function Decoder .........6-6246464654c84e88 4-10
4.5 SHIFT REGISTER (BUFFER). ..... be ww ee tw tw we 4-12
4.6 CHARACTER PRINTING. ....... 22. 2 0 ee ee we ee 4-14
4.6.1 Initializing the Printing Operation. ....... 4-14
4.6.2 Character Registration and Timing. ........ 4-15
4.6.3 Character Generator (ROM). .........2... 4-18
4.6.4 Print Head Operation. .......24646404688-8 4-20
4.6.5 Power Driver Circuits. . ...... 26 2 ee eee 4-21
4.7 PAPER MOVEMENT... 2. 2. 2 2 ee ew ee ew we ee we we ee 4-24
4.7.1
Line Feed... ... 1. 2 1 ew we ew tw ww 4-25
4.7.2 Form Feed. ...... 2. 1 eo ee ew ew ew ew ew ww 4-26
4.7.3 Vertical Tab. .........0242484 00 ee ee 4-27
4.7.4 Wertical Format Unit. .......2.0.60464208-8 4-28
4.7.5 Line Feed Solenoid Driver. .........e6.6-. 4-29
4.8 SPECIAL FUNCTIONS. ... . 2... 1 ee ww ew ew et te 4-30
4.8.1 Bell (Optional). ........ 06.6.6 2 ee eee 4-30
4.8.2 Delete... .. 1. 1 ew ew we ew ew we tt te 4-30
4.8.3. Paper Empty. ........ 505656 0 «© we ee eee 4-3]
4.8.4 Motor Control (Optional) ..........0.e-. 4-31
4.9 POWER SUPPLIES ........ 2. © © © we ee we ew ws 4-34
4.9.1 +5V Regulator. .......4.2.2.66.26c86858484 0848 4-36
4.9.2 +12V and -12V Regulators ..........e8e8- 4-37
4.9.3. +35V Power Supply, Unregulated ........... 4-37
4.10 OUTPUTS FROM LSI CHIPS .......... 0404248488088 4-38
4.10.1 Outputs from LSI Chip ME5......2.2.2.2.4.2... 4-38
4.10.2 LSI Chip ME9...........0 2628 2 we eee 4-4)
i1 Rev. A

Section
o.1
9.2
6.1
6.2
6.3
TABLE OF CONTENTS (cont'd)
SECTION 5
REMOVAL,
REPLACEMENT
AND
ADJUSTMENT
PROCEDURES
INTRODUCTION.
MECHANICAL ASSEMBLIES.
AnaInrianinnn
ooo
ot
ND RO AD PO
AO
NAD
NO
NAD [PO
lo NO
lO
PO
WO
CONN
OP
WNMrF
Cover (A) . .
Carriage Mechanism (HA)
Driving Mechanism (HB).
Spring Drum (HC).
Damper (HD)
Frame (HE) . . tk
Paper Feed Mechanism (HF).
Pin Feed Unit (HF). . .
Form Feed Mechanism (HH) .
Ribbon Feed Mechanism (HI)
Electrical Hardware (HJ) .
Paper Stacker and Guide ...
Printer Head and Associated Assemb1 ies
SECTION 6
MAINTENANCE
ADJUSTMENTS . ;
PREVENTIVE MAINTENANCE
TROUBLESHOOTING GUIDE
SECTION 7
DRAWINGS AND PARTS LISTS, ELECTRICAL
SECTION 8
DRAWINGS AND PARTS LISTS, MECHANICAL
APPENDIX A
~1O1AL
SIGNAL
GLOSSARY,
SOURCE
AND
DESTINATION
LISTING
APPENDIX B
STANDARD 9 x 7 64-CHARACTER SET
APPENDIX C
PARALLEL
INTERFACE
SPECIFICATIONS
oO
eo QO
ep)
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O1
II
-—
eed
i
Pm BP
B
WN
AOPO
PO FF
FN
WD
PO
Mmmm
PhocOo
mRO
wo
CO
6-1
6-3
Rev.

LIST OF ILLUSTRATIONS
Figure Page
1-1 Model 101AL Printer (Top Cover Removed) ........ 1-2
1-2 101AL Printer Logic Flow Diagram. ........... 1-3
1-3 Printing the Letter (H) .........4...28 8888 1-4
1-4 Print Head Components ........4...2.0880868 1-4
1-5 Paper Movement. . . 2. 2. 2 6 ee ee ee ew ew ew ew we 1-5
1-6 Left Front View of 1OIAL........2.2.2.2.2.22.2.4.2. 1-8
1-7 Right Front View of 1O1AL.......2.2.2....28-8 1-8
1-8
Rear View of 1OIAL. ....... 2... ee ee eee 1-9/1-10
1-9 Rear View (101AL Electronics Cavity Removed). .... . 1-9/1-10
2-1 Printer Dimensions. . . 1... 2. 6 ee ww te ee ee 2-1
4-1 Model 1lOIAL- Block Diagram. .........2.2.+4+6-6 4-2
4-2 Prime Timing. . 2... 2 ee ew ew ew ww we ew we we et 4.4
4-3 Input Data Timing - No Busy CondItion......... 4.7
4-4 Input Data Timing - Causing Busy Condition. ...... 4-8
4-5 Character Timing. . ..... 6. © ee we we we we ee 4-16
4-6 Normal and Elongated Characters .........e66-. 4-19
4-7 Print Head Timing . ........ 6.06606 6 «© ee ee 4-2]
4-8 Power Driver Waveform. ........464.4.448888 4-22
4-9 Line Feed Timing ....... 2.6 © © © © we we ee 4-27
4-10 Form Feed and Vertical Tab Timing. .......... 4-28
4-11 VFU Tape Reader Amplifier (located in VFU)....... 4-29
4-12 Location of Motor Control] Circuit. .......4... 4-31A
4-13 Motor Control Assembly Interconnection Diagram. .... 4-31B
4-14 Motor Control Timing. ....... 2... © «© ee we ew 4-33
4-15 Multitap 50/60 Hz Transformer ..........2446-. 4-35
4-16 +5 Volt Regulator Interconnection Diagram ....... 4-36
4.17 12V Regulators Interconnection Diagram ........ 4-38
5-1 Model 101 Series Drive Train .......4.-+ see. 5-8
5-2 Main Motor Drive and Belt Arrangements ........ 5-13
5-3A Bushing End Play Adjustment for Preload Clutch Shaft
(HB-50) a a 5-21
5-3 Flexible Timing Fence Mounting, Series 101. ...... 5-29
iV Rev.

oc
ty yf
meer
Figure
5-4
5-4A
9-5
9-6
5-/
5-9
5-10
5-11
7-1
7-2
7-3
7-4
7-5
7-6
7-7
7-8
7-9
7-10
7-11
7-12
7-13
7-14
7-15
7-16
7-17
7-18
7-19
7-20
7-21
7-22
7-23
LIST
OF
ILLUSTRATIONS
(cont'd)
Pade
Location
of
Left
Reed
Switch
(Top
View),
.......
.
.
5-24
Two
Adjustments,
Gear
with
Stop
Cam
(HH-23)
and
Inside
Cam
(HH-14)
2
ow
ke
ee
5-31
Ribbon
Feed
Mechanism
(Rear
of
Printer,
Left
Side)
.
.
.
.
5-36
Backlash
Adjustment,
Bevel
Gear
(HI-43,
59)
......-
5-37
Driving
Slide
Shaft
A
-
Adjustment...
...
+.
-
»
2»
9738
Ribbon
Reversing
Rod
Adjustment
.-
+--+
see
ete
5-39
Ribbon
Reverse
Timing
.
.
,.,.....2
ee
ee
eee
5-40
Fibre
Optics
Head,
Adjustment
from
Optic
Fence
-
+--+
+e.
5-45
Fibre
Optics
Head
Alignment
and
Flexible
Timing
Fence
,
.
5-45
Schematic Diagram, Logic/P.S. Board +5V (Sheet 1 of 4) . . 7-3
Schematic Diagram, Logic/P.S. Board +5V (Sheet 2 of 4) . 7-4
Schematic Diagram, Logic/P.S. Board +5V (Sheet 3 of 4) . 7-5
Schematic Diagram, Logic/P.S. Board +5V (Sheet 4 of 4) .. 7-6
Schematic Diagram, Power Driver Board (Sheet 1 of 2) . 7-7
Schematic Diagram, Power Driver Board (Sheet 2 of 2)... 7-8
Schematic Diagram, Video Amplifier ............ 7-9
Schematic Diagram, Power Connections 1OIAL........ 7-10
Schematic Diagram, Motor Control .........4.4.. 7-11
Multitap Transformer 50/60 Hz .......46424808-4 7-12
Wiring Diagram, Printer Mechanism ........-2.2.6-4 7-13
Interconnection Diagram, Connector Board and Power Supply. 7-14
101AL Connector Configuration .........60 6488-8 7-15
Component Board Assembly, Logic/P.S. Board +5V — |
(Sheet 1 of 3) 2... ww ee ee ee ee ke ee we 7-17
Component Board Assembly, Logic/P.S. Board +5V
(Sheet 3 of 3) 7 ww wk ee ee ee ee ee ee 7-18
Component Board Assembly, Power Driver .......... 7-23
Component Board Assembly, Video Amplifier. ........ 7-25
Component Board Assembly, Connector Board. ........ 7-27
Component Board Assembly, Motor Control ......... 7-29
Electronics Cavity Assembly ........6 64.4068 7-31
Harness Assembly (W1) ... 2... ee eee ee eee 7-33
- Input Cable Assembly .. 0... eee ee ee ee 7-35
Power Cable Assembly (W3). .... 2.0... 0 ee ee ee 7-37
-\- Rev. B

Figure
8-4
8-1
8-2
8-3
8-3A
g-4
8-5
8-6
8-7
8-8
8-9
8-10
8-12
LIST OF ILLUSTRATIONS (cont'd)
Mechanical Sub Assemblies
Cover Assembly -
Carriage Mechanism .
Drive Mechanism .
Drive Mechanism (Preload Clutches).
Spring Drum
Damper
Frame
Paper
Feed Mechanism . ee
Pin Feed Mechanism (Left and Right)
Form Feed Mechanism.
Ribbon Feed Mechanism .
Print Head and Associated Assemblies .
-Vi-
Page
8-2A
8-3
8-5
8-9
8-11
8-13
8-15
8-17
8-19
8-21
8-23
8-26
Rev.

SECTION 1
INTRODUCTION
This manual describes the Model 1O1AL printer, manufactured by
Centronics Data Computer Corporation. It provides general information,
detailed theory of operation and maintenance information enabling field
service personnel to maintain the printer. For serial input or other
detailed interface information, a separate document for each interface
is published for your reference.
purpose.
Section 1
Section 2
Section 3
Section 4
- Section 5
Section 6
Section 7
The manual is grouped into eight sections, each with its specific
INTRODUCTION, introduces the reader to the scope and
content of the manual, and provides the reader with a
general description of the printer.
INSTALLATION, contains unpacking and installation in-
structions for the printer.
OPERATION, describes the function of all operator con-
trols and indicators and how they are used.
THEORY OF OPERATION, contains a detailed description of
each major operation performed by the printer electronics,
including timing diagrams and, where applicable simplified
circuit diagrams, all keyed to the schematic drawings.
REMOVAL, REPLACEMENT AND ADJUSTMENT PROCEDURES, includes
step-by-step removal and replacement procedures for all
major assemblies and sub-assemblies in the printer.
MAINTENANCE, includes preventive and corrective maintenance
procedures and a maintenance schedule.
ELECTRICAL DRAWINGS AND LIST OF MATERIALS, contains a
complete set of schematic, wiring and component board
layout diagrams and their associated list of materials
for the electrical portion of the printer.
1-1 Rev. A

Section 8 - MECHANICAL DRAWINGS AND PARTS LISTS, includes all printer
assembly drawings and their associated parts lists for
the mechanical portion of the printer.
At the end of the manual are several appendices which include a
glossary of signal mnemonics, a standard 9 x 7 64-character set, and
parallel interface specifications.
1.1 GENERAL DESCRIPTION
The Model 101AL printer (Figure 1-1) is a medium speed impact printer
which uses a 9 x 7 dot matrix for character generation. The unit prints at
a rate of 165 characters per second with an average speed of 132 characters
per second (including the return time for the printing head). The printer
is capable of printing 132 columns, with paper width varying from 4 inches
to 14-7/8 inches. The unit uses sprocket-fed paper and generates 6 lines
to the inch with 10 characters per inch, horizontally. The printer does
not require special paper and can produce an original plus four copies.
The printer is completely self-contained. A single printed circuit
board contains both the control logic and power supplies, made possible by
the use of LSI (Large Scale Integration) zircuitry.
Figure 1-1. MODEL 101AL PRINTER (TOP COVER REMOVED)
1.2 LOGIC FLOW DIAGRAM (Figure 1-2)
The 132-character input buffer can receive parallel data at a rate
of up to 75,000 characters per second. If the input device transmits serial
data (100-9600 Baud), then an optional RS232 interface is required to assemble
the serial data, then transfer it in parallel to the input buffer in the
printer.
1-2 Rev. A

Paper movement is initiated by a line feed, vertical tab and form
feed function. The Vertical Format Unit (VFU) tape reader provides vertical
tab and top of form spacing control by means of a perforated paper tape. In
addition, the printer recognizes the following special control codes: bell,
delete, select, de-select and elongated character, as described in Section 1.3.3.
Once a line of printable characters is stored in the buffer, head
motion is initiated by activating the forward clutch, causing the print head
to move from left to right across the paper. With the head in motion, data
is transmitted from the buffer to the character generator. From there, char-
acter write pulses are sent to the driver circuits, which energize the print
head solenoids causing the print wires to form the characters on the paper.
PARALLEL INPUT (TIMING)
Rate = 75,000 Characters Per Second
Mark = Binary 1 = +2.4 to 5.5 Volts
Space = Binary 0 = 0 to + 0.4 Volt
1
Data on oe ew x.
0.5 [1S
(min) Pt 0.5 1 S (min)
Data Strob Ly
0.5 2S (min) =» ke
500 11S (max) 2.5 HS (min) BUZZER
+ 7 > 5.0 LS (max) SPECIAL FUNCTIONS
Acknowledge 7
2.5 [LS (min)
10 [LS (max) BELL
DELETE
—Oy LINE FEED Ley PAPER
CARRIAGE RETURN MOVEMENT
| v | VERTICAL TAB
INPUT EXPANDED CHARACTERS
BUFFER SELECT VFU TAPE
DE-SELECT —_— READER
RS 232
INTERFACE:
(OPTIONAL)
CHARACTER [gy DRIVER
a fi
STORAGE SHIFT GENERATOR CIRCUITS
REGISTER
RS 232 SERIAL INPUT (TIMING)
Baud Rate = 100 — 9600 .
Start Pulse = One Bit Time Le HEAD MO‘ ION FORWARD PRINTING
Stop Pulse = min, of One Bit Time CONTROL CLUTCH HEAD
Mark = Binary 1 = -3 to -27 Volts
Space = Binary 0 = +3 to +27 Volts
"sen Bit | Stop Bit
8 Bits a
5
+V —T7-T "TO ToT rer a w=Space
| terest bb | |
-V L Jobb it_i_li. Mark
MSB \ LSB
iH
Parity Bit
Figure 1-2. 1O1AL PRINTER LOGIC FLOW DIAGRAM
1.3. PRINTER OPERATION
- Basically, all printer functions can be grouped into one of the following
three categories: 1) character printing, 2) paper movement, and 3) other
auxiliary functions such as printer select/deselect, delete, etc.
1-3 Rev. A

1.3.1 CHARACTER PRINTING
A small aluminum carriage supports the print head assembly. During
printing operation, the carriage travels along the print line from left to
right at a constant rate of approximately 16.25 inches per second, and returns
in approximately 240 milliseconds.
Printing is accomplished by selectively firing the print wires. These
wires graphically construct the characters out of dots, as the print head moves
from left to right across the print line.
Printing impulses energize the print solenoids and drive the print
wires against the ribbon, paper and platen to form the characters in a dot
matrix pattern. When the solenoids are de-energized, the wires are withdrawn
so they are flusn with the surface of the jewel. Each solenoid can fire in-
dependently up to five times for any one character. Figure 1-3 is an example
of the dot matrix forming the letter H. All character formations in the
standard 9 x 7 dot matrix are shown in Appendix B. |
SOLENOIDS
NOW
—
nN
DNM
CASTING
Figure 1-3. PRINTING THE LETTER (H) Figure 1-4, PRINT HEAD COMPONENTS
The print head (Figure 1-4) consists of the jewel, casting and seven
solenoids with attached print wires. The seven print solenoids and their
attached print wires are arranged radially around the print head. The free
ends of the print wires pass through a wire guide at the front of the print
head, which properly spaces the wires so that the correct wires passes through
the correct hole in the print jewel.
Printing action is initiated when the input buffer has been filled or
a carriage return (CR) character has been received. The print head then sweeps
across the page until a CR command is decoded at the buffer output or the head
reaches the 132-column limit (right) switch. At this time, the print head re-
turns to the left margin and an automatic line feed is performed. As an option,
the automatic line feed can be disabled.
Rev. C 1-4

1.3.2 PAPER MOVEMENT
Paper can be moved manually by rotating the platen knob (shown in
Figure 1-5) or automatically by any of three paper movement commands: Tine
feed, vertical tab and form feed.
PAPER
ADVANCE
FORM FEED
(RELEASE)
CLUTCH
FORM FEED
HOLE
Figure 1-5. PAPER MOVEMENT
A small independent motor not shown in Figure 1-5, provides the power
necessary to move the sprocket-feed tracotrs which control paper movement.
To move the paper, the printer electronics activates a line feed solenoid
which activates a clutch that mechanically links the motor to the sprocket-feed
tractors.
To initiate a single line feed, the line feed solenoid is energized
for 15 milliseconds to initiate paper motion. Upon completion of the line feed
command, a 60 millisecond delayed line feed is generated. This allows the
clutch pawl and clutch mechanism to return home before another line feed is
allowed.
Vertical forms movement is accomplished hy applying a DC level to the
paper feed solenoid until a hole is detected in the Vertical Format Unit (VFU).
The tape consists of two tracks; one used for Top of Forms and the other for
Vertical Tab. The movement of the paper tape is caused by direct mechanical .
linkage to the gear train which drives the paper feed tractors.
When the printer runs out of paper, a sensing switch activates a
two-second audible tone in a speaker located at the rear. The printer also
Stops printing and lights the PAPER EMPTY light on the control panel.
1-5 Rev. C

Rev.
1.3.3 SPECIAL FUNCTION
In addition to the printable characters shown in Appendix B, the
printer can recognize the following special functions:
1.4
Carriage Return (Octal 015) - Initiates the printing of a line.
Form Feed (Octal 014) - Moves the paper until the top of the form
hole in Tape Reader Channel 7 is reached.
Vertical Tab (Octal 013) - Moves the paper until the next hole in
Tape Reader Channel 5 is reached.
Line Feed (Octal 012) - Advances the paper one line.
Delete (Octal 177) - Primes the printer electronics to an idle state
and deletes any characters stored in the printer.
Bell (Octal 007) - Generates a two-second audible tone in the speaker
at the rear of the printer. 7
Select (Octal 021) - Allows printer to receive data, same as activating
SELECT switch.
De-Select (Octal 023) - Inhibits printer from receiving data, same as
deactivating SELECT switch.
SYSTEM FEATURES
1.4.1 FEATURES
Standard features optional features
e Vertical format control e Character sets of 64, 96 or 128 characters
e Audio alarm e Popular parallel! and serial interfaces
e Form feed control (via paper tape loop) e Automatic motor control
e Elongated boldface characters (line-by-line) e Selectable single character elongation
e Parallel data input e Elapsed time indicator
e 4 inches/second slew rate
e Prints original plus four copies
e Fixed vertical/horizontal registration
e Paper runaway inhibit
e Separate prime line and fault line to output
connector
Provision for additional character set
Remote select/deselect
Available with 50 or 60 Hertz, 115 or
230 Volts AC
Automatic line feed disabled
9x 7or5x/7 dot matrix
1-6

1.4.2 SPECIFICATIONS SUMMARY
Printing Method
Printing Rate — Characters
— Full Lines
— Short Lines
Transmission Rate — Serial
— Parallel
Data Input
‘Character Structure
Code
Indicator-Switch Controls
Indicator
Manual Controls
Character Buffer
Format
Paper Feed
Paper
Number of Copies
Dimensions
Weight
Electrical Requirements
Temperature — Operating
— Storage
Humidity — Operating
| — Storage
1.5 PHYSICAL DESCRIPTION
photo.
Impact, character-by-character, one line at
a time
165 characters per second
60 lines per minute (132 character line)
200 lines per minute (20-30 characters)
100 to 9600 baud (with Serial option)
Up to 75,000 characters per second
Parallel (Serial option available)
9 x 7 dot matrix, 10-point type
equivalent
USASCII — 64 characters printed,
lower case Characters recognized
and printed as upper case
equivalent |
ON/OFF, SELECT, TOP OF FORM,
FORMS OVERRIDE, LINE FEED
PAPER OUT |
Form Thickness, Paper Advance Knob
132 characters (1 line)
132 characters maximum per line, 6 lines
per inch
Sprocket feed, adjustable from 4” to 147/s”
width
Standard sprocketed paper
Original and up to four carbon copies
11'/2" high, 20” deep, 2773/4" wide
118 pounds
115 VAC £10%, 60 Hz or
115/230 VAC +£10%, 50 Hz
40° to 100° F
—40° to 160° F
5°/o to 90°/o (no condensation)
0°/o to 95°%/o
The printer is approximately 113;" high, 20" deep, 27-3/4" wide and
weighs approximately 118 pounds.
views of the printer taken with the covers removed. Each major printer
assembly is located on these figures and identified in the table below the
Figures 1-6 through 1-9 are photographic
Rev. C

1. Print Head Assembly 4. VFU Tape Reader 7. Spring Drum 10. Timing Fence
2. Carriage 5. Pin Feed Mechanism 8. Platen Knob 11. Main Drive Belt
3. Form Feed Mechanism 6. Ribbon Feed Mechanism 9. ° Damper
Figure 1-6. LEFT FRONT VIEW OF 101AL
1.
Operator
Control
Panel
5.
Optical
Pick-Up
9.
Penetration
Control
Knob
13.
Cooling
Fan
2.
Form
Feed
Motor
6.
Optic
Bundle
10.
Forward
Clutch
14.
Ribbon
Feed
3.
Video
Amplifier
and
Cable
Assembly
7.
Ribbon
Cable
11.
Main
Pulley
and
Drive
Belt
Mechanism
4.
Light
Source
8.
Power
Driver
Board
12.
Reverse
Clutch
15.
Line
Feed
Figure 1-7. RIGHT FRONT VIEW OF 101AL
Rev. C 1-8

1. Connector Card 6. Jil 11. Logic/Power Supply Board
2. J4 7. Fuse F5 12. Speaker
3. J6 8. AC Power Input 13. Electronics Cavity
4. J3 9. +30V Power Supply 14. Input Connector
5. J2 10. Fuse F4
Figure 1-8. REAR VIEW OF 101AL
1. Main Motor 4. Electronics Connector 7. Ribbon Reversing Rod
2. Motor Starting Capacitor 5. Power Transformer 8. Ribbon Drive Rod
3. AC Power Connector 6. Power Distribution
Fiero
te,
NL a ,
Figure 1-9. REAR VIEW (101AL ELECTRONICS CAVITY REMOVED
-1-9/1-10- Rev. C