Centronics 101al Guide

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MODEL 101AL PRINTER

MAY

1H77

Cen1tronics No.

37400050

Rev. E

I:EnTROnll:S

data computer corp.

HUDSON,

NEW

HAMPSHIRE

03051

TELEPHONE

(603)

88_3

-0111

iJ§©IM1~U©&lb

[M{J&~

U:JJ&lb

MODEL 101AL PRINTER

MAY

1977

REVISION F

THE

INFORMATION

CONTAINED

HEREIN

IS

PROPRIETARY AND

IS

NOT TO

BE

RELEASED

OR

REPRODUCED

~ITHOUT

WRITTEN

PER-

MISSION OF CENTR!ONICS

data

computer

corp.

;

!I:EnTROnll:s

ft

:data computer corporation

Hudson,

New

Hampshire

03051

Telephone

(603)

883

-

0111

SECTION

1.1

1.2

1.3

1.4

2.1

2.2

2.3

4.1

4.2

4.3

4.4

4.5

4.6

4.7

4.8

4.9

4.10

5.1

5.2

6.1

6.2

6.3

6.4

6.5

TABLE OF CONTENTS

SECTION 1

INTRODUCTION

General

Description.

. . . . . .

Logic

Flow

Diagram (Figure 1-2)

Printer Operation

.....

.

Specifications . . . . . . . . .

SECTIONS 2

AND

3

INSTALLATION

AND

OPERATION

Site Preparation (Figure 2-1) . . . . . . . .

Shipping

Crate.

. . . . . . . . . . . . .

Paper Guide and Stacker Assembly (527001001)

SECTION 4

THEORY

OF

OPERATION

Introduction

Basic

Timing

Initializing the

Printer.

-.

Data

Input

. . . . . .

Shift

Register (Buffer) .

Character Printing

Paper

Movement.

. .

Special Functions

Power Supplies

Outputs From LSI

Chips.

SECTION 5

REMOVAL,

REPLACEMENT

AND

ADJUSTMENT

PROCEDURES

Introduction

. . . . . .

Mechanical Assemblies

5.2.1

5.2.2

5.2.3

5.2.4

5.2.5

5.2.6

5.2.7

5.2.8

5.2.9

5.2.10

5.2.11

5.2.12

5.2.13

Cover . . . . . .

Carriage Mechanism.

Driving Mechanism

Spring

Drum

Damper

.....

F

rallle.

. . . . .

Paper

Feed

Mechanism

Feed

Unit

. . . .

Form

Feed

Mechanism

Ribbon

Feed

Mechanism.

Electrical

Hardware.

. . .

Paper Stacker

And

Guide . . . . .

Print

Head and Associated Assemblies.

SECTION 6

MAINTENANCE

Electrical Adjustments

Mechanical Adjustments

Preventive Maintenance (P.M.)

Troubleshooting Guide . .

Recommended Tools . . . . .

-i-

PAGE

1-1

1-2

1-3

1-5

2-1

2-2

4-1

4-4

4-8

4-9

4-15

4-19

4-22

4-24

5-1

5-2

5-5

5-14

5-15

5-19

5-21

5-24

5-28

5-34

5-35

6-1

..

6-2

6-4

6-6

Rev. f

Rev.

F

SECTION

FIGURE

1-1

1-2

1-3

1-4

1-5

1-6

1-7

1-8

1-9

2-1

2-2

4-1

4-2

4-3

4-4

4-5

4-6

4-7

4-8

4-9

4-10

4-11

4-12

4-13

4-14

4-15

5-1

5-2

5-3

5-4

5-5

5-6

5-7

5-8

5-9

5-10

5-11

5-12

5-13

5-14

5-15

5-16

5-17

5-18

TABLE OF CONTEI\ITS

CONTINUED

SECTION 7

DRAWINGS

AND

LISTS OF MATEFHALS,

ELECTRICAL

SECTION 8

DRAWINGS

AND

LISTS OF

MATEHIALS,

MECHANICAL

LIST OF ILLUSTRATIONS

Model

101AL

Printer (Top Cover Removed)

101AL

Printer Logic

Flow

Diagram

Printing the Letter (H)

Print

Head

Components . .

Paper

Movement . . . . .

Left

Front

View

of

101

A L .

Right

Front

View

of

101AL

Rear

View

of

101

AL

. . . . . . . . . .

Rear

View

(101AL

Electronics Cavity Removed)

Printer Dimensions .

...

. . . .

Paper

Guide and Stacker Assembly

Model

101

AL Block Diagram

Prime

Timing

. . . . . . . .

Data I

nput

Timing

. . . . . .

Character

Timing.

. . . . . .

Normal

and

Elongated Characters

Print

Head

Timing . . . . . .

Power Driver Waveform . . . .

Line

Feed

Ttming . . . . . .

Form

Feed

and

Vertical Tab Timing . . . .

VFU

Tape Reader

Amplifier

(Located in

VFU)

Motor

Control Location . . . . . . . . .

Motor

Contro(

Board Interconnection Diagram

Motor

Control

Timing.

. . . . . . .

+5V

Regulator Interconnection Diagram.

-12V Regulator Interconnection Diagram . .

Model

101

Series Drive Train . . . . . . .

Main

Motor

Drive and Belt Arrangements . . . .

Determining Backlash Adjustments, Shaft

(HB-27).

. . .

Use

of

Feeler

Gauge

for

Backlash

Adjustment

(H

B-30,

22).

.

Bushing End-Play

Adjustment

for

Preload Clutch Shaft (HB-50)

Flexible

Timing

Fence Mounting, Series

101

. . . . . . . .

Fence

Adjustment

and

Optic

Housing.

. . . . . . . . . .

VArtical and Horizontal

Alignment

of

Single Channel f)ptics Housing

Location

of

Left

Reed

Switch.

. . . . . . . . .

Removal

of

Feed

Belt, Idler Slide and Drive Pulley . . . . . .

Adjustment

for

Paper Holder Gate . . . . . . . . .

..

. . .

Maintaining 5/8-in. (15.9mm) Nominal Print Margin . . . . . . . . .

Two

Adjustments, Gear With Stop

Cam

(HH-23) and Inside

Cam

(HH-14) .

Ribbon

Feed

Mechanism (Rear

of

Printer, Left Side)

Backlash Adjustment,

Bevel

Gear

(H

1-43,

59)

Driving Slide Shaft A -

Adjustment

.

Ribbon Reversing Rod

Adjustment.

Ribbon

Reverse

Timing

. . . . . . . .

ii

PAGE

1-2

1-3

1-4

1-6

1-7/1-8

2-1

2-2

4-2

4-3

4-5

4-11

4-12

4-13

4-14

4-16

4-17

4-18

4-20

4-21

4-23

5-5

5-7

5-11

5-12

5-13

5-16

5-17

5-18

5-H~

5-22

5-23

5-24

5-27

5-31

5-32

5-33

FIGURE

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

7-2'1

7-22

7-2:3

8-i

8-1

8-2

8-3

8-3A

8-4

8-5

8-6

8-7

8-'8

8-9

8-1

()

8-12

LIST

OF

ILLUSTRATIONS

CONTINUED

Schematic Diagram, Logic/Power

Supply

+5Volts

(Sheet 1)

Schematic Diagram, Logic/Power

Supply

+5

Volts

(Sheet 2)

Schematic Diagram, Logic/Power

Supply

+5Volts

(Sheet

3)

Schematic Diagram, Logic/Power

Supply

+5Volts

(Sheet

4)

Schematic Diagram, Power Driver Board (Sheet

1)

Schematic Diagram, Power Driver Board (Sheet 2)

Schematic Diagram,

Video

Amplifier

. . . . .

Schematic Diagram, Power Connections

101AL

.

Schematic Diagram,

Motor

Control.

. . . . . .

Multitap

Transformer

50/60

Hz..

. . . . . .

Wiring Diagram, Printer Mechanism. . . . . . . . . . .

Interconnection Diagram, Connector Board and Power

Supply

. .

101

AL

Connector

Configuration.

. . . . . . . . . . . . .

Component

Board Assembly, Logic/Power

Supply

Board

+5Volts

..

Component Board Assembly, Logic/Power

Supply

Board

+5Volts

Component Board Assembly, Power

Driver.

. . . . . .

Component Board Assembly,

Video

Amplifier

Component Board Assembly, Connector Card

Component Board Assembly,

Motor

Control

Electronic Cavity

Assembly.

. . .

Harness Assembly (W1)

-.

. . . .

I

nput

Cable

Assembly.

. . . . .

Power Cable Assembly (W3)

Mechanical Subassemblies, Series

101

Cover Assembly

-"

A . . . .

Carriage Mechanism. . . . .

Drive Mechanism -HB (Part 1)

Drive Mechanism -HB (Part 2)

Spring

Drum

-

He

Damper -HD

......

.

Frame -

HE

. . . . . . . .

Paper Feed Mechanism . . . . .

Feed

Mechanism

(Left

and Right) -

HG

.

Form Feed Mechanism - HH . . . . .

Ribbon

Feed

Mechanism -HI . . . . . .

Print

Head and Associated Assemblies

(B)

.

NOTE

Refer

to

the

Engineering Change

Notice

(ECN) sheets

shipped

with

the

printer

for

changes made

to

the

prin-

ter

which

have

not

yet

been incorporated

into

the

draw-

ings in

this

technical manual. Always keep these Engin-

eering Change

Notice

sheets

with

the

manual.

Revision

IIBvel

indications

at

the

lower

right-hand corner

of

a

page

reflect

at

what

revision

of

the

manual

that

page

was

updated.

-iii/iv-

PAGE

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

7-19

7-21

7-23

7-25

7-27

7-29

7-31

7-33

8-2A

8-3

8-5

8-7

8-9

8-11

8-13

8-15

8-17

8-19

8-21

8-23

8-26

Rev. F

SECTION 1

INTRODUCTION

This manual describes the Model

101

AL

printer,

manufactured

by

Centronics Data Computer

Corporation.

It

provides general

information,

detail~d

theory

of

operation and maintenance

information

enabling field service personnel

to

maintain the printer.

For

serial

input

or

other detailed interface

infor-

mation, a separate

document

for

each

interface

is

published

for

your

reference.

The manual

is

grouped

into

eight sections,

each

with

its specific purpose.

Section 1 -

INTRODUCTION,

introdwces the reader

to

the scope and

content

of

the

Section 2

Section 3

Section 4

Section 5

Section 7

Section 8

manual, and provides the reader

with

a general description

of

the printer.

-

INSTALLATION,

contains unpacking and installation instructions

for

the printer.

-

OPE

RATION,

describes the

function

of

all operator controls and indicators and

how

they

are

used.

-

THEORY

OF

OPERATION,

contains adetailed description

of

each

major opera-

tion

performed

by

the

printer

electronics, including

timing

diagrams and, where

applicablH simplified

circuit

diagrams, all keyed

to

the schematic drawings.

-

REMOVAL,

REPLACEMIENT

AND

ADJUSTMENT

PROCEDURES, includes

step-by-step removal and replacement procedures

for

all major assemblies and

sub-assemblies in the printer.

-

MAl

NTENANCE,

includes preventive and corrective maintenance procedures and

a maintenance schedule.

-

ELECTR~CAL

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.

-

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, 54-character set, and parallel interface specifications.

1.1

GENERAL DESCRIPTION

The

Model101AL

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

155 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

gen-

erates 5 lines

to

the inch vertically

with

10 characters per inch,

horizontally.

The

printer

does

not

require

spe

cial paper and

can

produce one original plus

four

copies.

The

printer

is

completely self-contained. A

singile

printed

circuit

board contains

both

the

control

logic

and power supplies, made possible

by

the

use

of

LSI (Large Scale Integration)

circuitry.

1-1

Rev.

E

Figure 1-1.

MODEL

101AL

PRINTER (TOP COVER REMOVED)

1.2 LOGIC FLOW

DIAGRAM

(Figure 1-2)

If

the

input

device transmits serial data (100-9600 Baud) then

an

optional RS232 interface

is

re-

quired

to

assemble the serial data, then transfer

it

in parallel

to

the

input

buffer

in the printer.

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

spaeing

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, character

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.

Rev. E

DATA

INPUT

-

TIMING

VFU

OPERATOR

TAPE

BUZZER

FENCE

READER

PANEL

• • t ,

CONTROL

HEAD

MOTlON_

CLUTCH/

CONTROL

-

1.

PRINT

COMMAND

(CR

OR

LAST

CHAR.)

PAPER

MOTION_

PAPER

2. PAPER

MOVEMENT

~

MOVEMENl"

(LF,

VT,

FF)

CONTROL

SOLENOID

3.

SPECIAL

FUNCTIONS

(BEL~DELET~EX~

TIMING

CHAR)

1

SHIFT

-'

CHJlIRACTER I

WRITE

_J

PRINT

1

-

REGISTER

-I

GENERATOR

J PULSES" I

HEAD

BUFFER

Figure 1-2.

101AL

PRINTER LOGIC FLOW

DIAGRAM

1-2

1.3

PRINTER OPERATION

Basically, all

printer

functions

can

be

grouped

into

one

of

the

following

three categories:

1)

character

printing,

2)

paper moveme.nt, and 3)

other

auxiliary

functions such

as

printer

select/de-

select, delete, etc.

1.3.1

CHARACTER

PRINTING

A small aluminum carriage supports

the

print

head assembly. During

printing

operation, the car-

riage 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

flush

with

the surface

of

the jewel. Each solenoid

can

fire independently up

to

five times

for

anyone

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.

PRINT

HEAD

JEWEL

Figure 1-3.

PRINTING

THE

LETTER

(H)

PRINT

WIRES

A

Figure 1-4.

PRINT

HEAD

COMPONENTS

The

print

head (Figure 1-4) consists

of

the jewal, casting and

seven

solenoids

with

attached

print

wires.

The

seven

print

solenoids and

their

attached

print

wires

are

arranged 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

out-

put

or

the head reaches the 132-column

limit

right li'mit switch.

At

this

time,

the

print

head returns

to

the

left

margin and

an

automatic line feed

is

performed. As

as

an

option,

the automatic line feed can

be

disabled.

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: line feed, vertical tab and

form

feed.

1-3 nev.

l:

Rev. E

FORM

FEED

(RELEASE)

CLUTCH

Figure

1-.5.

PAPER

MOVEMENT

10183

A small independent

motor

not

shown in Figure 1-5, provides the

power

necessary

to

move

the

sprocket-feed tractors

which

control

paper movement.

To

move the paper, the

printer

electronics activates

a line feed solenoid which activates a

clutch

that

mechanicallv 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

by

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

channels; one

used

for

Top

of

Forms and the

other

for

Vertical Tab. The movement

of

the paper tape

is

caused

by

direct

mechanical lin-

kage

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

in

the rear

of

the

printer.

The

printer

also stops

printing

and lights

the

PAPE R

EMPTY

light

on the

control

panel.

1.3.3

SPECIAL

FUNCTION

In

addition

to

the

printable

characters shown in

Appendix

B,

the

printer

can recognize

the

following

special functions:

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

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.

Select (Octal 021) -

Allows

printer

to

receive data,

same

as

activating

SE

LECT

switch.

De-Select (Octal 023) -I

nhibits

printer

from

receiving data,

same

as

deactivating

SE

LECT

switch.

1-4

1.4 SPECIFICATIONS

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:

E!ectrical Requirements:

Temperature -Operation:

-Storage:

Humidity

-Operating:

-Storage:

Standard Features:

Optional Features:

1.5

PHYSICAL

DESCRIPTION

Impact, character-by-character, one line at a time.

:165 characters per second

:55

±.

5 lines per minute (132 character line)

i200 lines per minute (20-30 characters)

'100

to

9600

baud

(with

Serial

option)

,See

Timing

Diagram -Appendix B

;Parallel (Serial

option

available)

:9

x 7

dot

matrix,

1O-point

type

equivalent

:USASCII -64 characters printed, lower

case

characters

irecognized 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

14-7/8"

width.

Standard sprocketed paper

Original and up

to

four

carbon copies

11

%" high,

20

" deep, 27%" wide

118 pounds

115

VAC

±.

10%

60Hz

or

115/230

VAC

±.

10%

50 Hz.

40"

to

100° F

-40"

to

1

60"

F

5%

to

90% (no condensation)

0%

to

95%

Vertical Format Control

Audio

Alarm

Elongated Boldface Characters

Paper Runaway

Inhibit

$eparate Prime Line and Fault Line

to

Output

Connector

'Remote Select/De-Select

Automatic

Line

Feed

Disabled.

Character

sets

of

64,96,

or

128 characters

Popular parallel and serial interfaces

Automatic

motor

control

Selectable single character elongation

f=lapsed

time

indicator

The

printer

is

approximately

11

%" high,

20"

deep, 27-%" wide and weighs approximately 118 pounds.

Figures 1-6 through 1-9

are

photographic views

of

the

printer

taken

with

the covers removed. Each major

printer

assembly

is

located on these figures and ideritified in the table below the photo.

1-5

F~ev.

E

1.

Print

Head Assembly

2. Carriage

3.

Form

Feed Mechanism

1.

Operator

Control

Panel

Rev.

E

2.

Form

Feed

Motor

3.

Video

Amplifier

and

Cable

Assembly

4.

Light

Source

4.

VFU

Tape Reader 7. Spring

Drum

10.

Timing

Fence

5. Pin Feed Mechanism 8. Platen

Knob

11.

Main

Drive

Belt

6.

Ribbon

Feed Mechanism

9.

Damper

Figure

'1-6.

LEFT

FRONT VIEW

OF

101AL

5.

Optical

Pick-Up

9.

Penetration

Control

Knob

6.

Optic

Bundle

10.

Forward

Clutch

7.

Ribbon

Cable

11.

Maiin

Pulley

and

Drive

Belt

8. Power

Driver

Board 12. Re"erse

Clutch

Figure 1-7.

RIGHT

FRONT VI

EW

OF

101AL

1-6

13.

Cooling

Fan

14.

Ribbon

Feed

Mechanism

15.

Line

Feed

1.

Connector

Card

2.

Connector

J4

3.

Connector

J6

4.

Connector

J3

5. Connectlor J2

1. Main

Motor

2.

Motor

Starting

Capacitor

3.

AC

Power

Connector

6.

J1

7.

FuseF5

8.

AC

Power

Input

9.

+30V

Power

Supply

10.

Fuse

F4

Figure 1-8. REAR

VIEW

OF

101AL

4.

Electronics

Connector

5. Power

Transformer

6.

Power

Distribution

11.

.

Logic/Power

Supply

Board

12.

Speaker

13.

Electronics

Cavity

14.

Input

Connector

7.

8.

Ribbon

Reversing Rod

Ribbon

Drive

Rod

Figure 1-9. REAR

VIEW

(101AL

ELECTRONICS

CAVITY

REMOVED)

1-7/1-8

Rev.

E

SECTIONS 2

AND

3

INSTALLATION

AND

OPERATION

A separate operators manual (No. 37400001): contains most

of

the installation, set-up and

operating procedures

for

the Series 100 printers. This operators manual should

be

referred

to

during

normal

printer

installation and operation.

Included on the

following

pages

is

additional ,information

not

contained in the operators manual.

2.1 SITE

PREPARATION

(Figure 2-1)

A line drawing

of

the

printer

dimensions

is

shown in Figure 2-1. As shown in this drawing, the

width

of

the installation site must take

into

account the side covers in

an

opened position.

;?~~~f~~

111111111111

@

~

~~====20="(=50=,8=cm=)==~~~L---

27,7"(70,~cm)

-----1

Figure 2-1.

PRINTER

DIMENSIONS

Enviromental and electrical requirements at the installation site are

as

follows:

Temperature:

Humidity:

Electrical:

2.2 SHIPPING

CRATE

40°

to

100° F (Operating)

-40°

to

1600

F (Storage)

5%

to

90% (no condensation) -Operating

0%

to

95% -Storage

115

VAC

±.10%, 60Hz, 3 amps

115/230

VAC

±.1

0%,

50Hz, 1.6 amps

The

printer

is

shipped in a crate

approximately.20

inches high, 27 inches deep and 32 inches wide. The

crate

is

made

of

weatherized, triple-,walled cardboard. When

properly

strapped, the packing crate and

printer

is

capable

of

fork

lift

operation

with

a seven-high stacking capability.

Shipped

with

the

printer

are the

following

items:

(1)

If

a special interface

is

used, the interface card

is

included

with

the

printer.

For

certain interfaces

such

as

the RS232, a special cable

is

also shipped. Cabling requirements

for

the standard parallel

interface

are

defined in

Appendix

B.

2

..

1

Rev.

E

(2) A standard vertical

format

paper tape providing six line feeds (one inch)

for

each

vertical

tab and

66

line feeds

(11

inches)

for

each

form

feed code. This tape

is

a part

of

the

ver-

tical

format

unit.

Refer

to

the Operators Manual

for

duplicating the

exixting

tape,

or

if

a

different

format

is

desired,

for

generating a new tape.

(3) Documentation -

All

documentation describing

that

particular

printer

is

included in a plastic

under the printer. This documentation includes a teehnical manual

for

the

printer

and any

optional interface, and a notice

of

all approved changes incorporated in the

printer

but

not

documented in the manual.

Please

keep this documentation

with

the

printer

at all times

so

that

accurate

information

will

be

available

for

troubleshooting purposes.

(4) Pin

Feed

Knobs -These knobs

are

contained in a small plastic

bag

stapled

to

the guide bar

for

the pin feed

unit.

(5)

Print

Sample - A sample

printout

from

that

particular

printer

is

included in the upper paper

pan.

(6) Unpacking/Repacking and Set-up Instruction Sheet.

Shipped in a separate container

is

the paper guide and stacker assembly. Installation instructions

for

this assembly

are

included

with

the assembly and also in St3ction 2.3.

2.3 PAPER GUIDE

AND

STACKER ASSEMBLY (5270010101)

ASSEMBLY

INSTRUCTIONS

Attach

paper guide and stacker assembly (one piece)

to

the back,

top

of

printer

by

first

removing

two

screws

from

the

left

and

right

side, and install using a

flat

bladed screwdriver. Make sure rounded

pa-

per guides rest on

top

of

printer

in

front

of

paper feed opening.

ATTACHING

SCREWS

STACKER

GUIDE!

TRAY

PRINTER

STAND

OPERATION

,,}'RINTER

STAND

TABLE

TOP

OPERATION

Figure 2-2. PAPER

GUIDE

AND

STACKER

ASSEMBLY

2-2

SECTION

4

THEORY

OF

OPERATION

4.1

INTFtODUCTION

This section on

the

theory

of

operation

contains a detailed description

of

each

major

function

performed

by

the

Model 101 A L

printer

electronics. Figure

4-1

shows a basic

functional

diagram

of

the

printer

electronics.

Throughout

this

section, reference

is

made

to

the

schematic diagrams contained in Section

7.

The section

is

organized

as

follows:

Paragraph 4.2 Basic

Timing

4.3 I

nitializing

the

Printer

(Prime, Select)

4.4 Data

Input

(Data, Strobe, Busy, Acknowledge)

4.5

Shift

Register

(Buffer)

4.6 Character

Printing

4.7 Paper Movement

(Line

Feed, Vertical Tab,

Form

Feed)

4.8 Special

Functions

(Bell, Paper

Empty,

Delete,

Motor

Control)

4.9 Power Supplies

4.10

Outputs

from

LSI chips

4.2

BASIC

TIMING

The basic

timing

clock

for

the

printer

electronics

is

derived

from

signal OSC. This OSC signal

is

generated on LSI chip

ME9

25. The frequency

of

OSC, determined

by

the

RC

circuit

(R41-C9)

on pin 26

of

this

chip,

ranges

from

100

to

200

KHz.

This OSC

clock

is

then used

by

both

LSI chips

(ME5

and ME9)

for

internal

timing,

and

is

in-

verted

by

ME4-6

to

generate OSCXT. Signal

OSCXT

goes

to

the

printer

interface

connector

and

if

an

optional

interface

is

used,

it

also

goes

to

this

optional

interface board (e.g., RS232 Serial Inter-

face).

4.3

INITIALIZING

THE

PRINTER

Before the

printer

can accept

input

data,

it

must

first

be

PR

I

ME'd

and

SE

LECT'ed.

The

prime

operation initializes

the

printer

logic

to

a ready state. The select operation

after

causing a

prime

con-

dition,

(which

can

be

disabled

by

jumper

(E14-E15~,

resets

the

busy line

to

the

interface

connector

and makes

the

printer

ready

to

receive data.

4.3.1

PRIME

The

PR

IME signal, generated on LSI

chip

ME9-37,

is

generated

by

any

of

the

following

con-

ditions.

A. Power

Turn-On

-When

the

printer

is

turned

on, capacitor C17

is

initially

discharged causing

a

low

100-500

msec PWRPRM signal

into

ME9-32. This generates a high

PRIME

signal

at

ME9-

37. As C17 charges

to

+5V,

PWRPRM

goes

high

terminating

the

power

prime

operation.

4-1

Rev. E

INTERFACE

CONNECTOR

r--------------------------.

I LOGIC/POWER SUPPLY BOARD I

, PRINT WIRE ,

I

PARALLEL

DATA

INPUT

I (DSl -

DS8)

I

:>

SHIFT

REGISTER

TB1-T88

~

CHARACTER

GENERATORS

V CONTROL

CGl-7

,

~

V

~

TO PRINT

HEAD

r-vSOLENOIDS

8 x 133

j

~.

CLKTB2,

SRCL,

PRIME

iii

~

.oJ

u

PAPER

MOVEMENT

-

I

INPUT PRIME,

DATA

STROBE LSI CHIP

NO.1

_ CONTROL..

I

I ACKNOWLEDGE. BUSY I

(DATA

DECODE) -

r-

I !

I I

I :

I

L

__

_

BUZZER

-r-

VFU

TAPE

VTH.

FFH

READER

c

Z

en

<t

a:

en

0

w

~

1:

<t

u u

~

0

en

~

OPERATOR

PANEL

(ROM's)

•

o:r

9

0

3:

u

c

C!:I

~.

Z

:E

;:

~

u

C

LSI

CHIP

NO.2

(PRINT CONTROLl

PMSOL

FWD CLUTCH CIP

REV CLUTCH CIR

-

--

-

DRIVER

CIRCUITS

~

TO

LINE

FEED

SOLENOID

~TOFORWARD

CLUTCH

-

i1

-

"'----_

..

,

TO REV CLUTCH

STROBE

DLYSTB STROBE ...-......._

VIDEO

AMP

ONE-SHOTS

___________

...1

RTPSW.

EOPSW

LIMIT

SWITCHES

Figure 4-1.

MODEL

101AL

BLOCK

DIAGRAM

B.

PrinterSelection-lfthe

Delete

Inhibit

option

(DELlNH)

is

not

used

(i.e.,

jumper

E13to

E14

is

connected), then a

low

SLCT

input

to

ME9-40 and a high

DELINH

to

ME9-39

gen-

erates a 100-400

usec

PRIME pulse at ME9-37.

C.

End

of

a Printed Line -

At

the end

of

a line

of

print,

CI

PX

at

ME9-30

goes

high,

turning

off

the

forward

clutch

and generating a 100-400

usec

PRIME pulse

at

LSI chip ME9-37.

D. Delete Code -Receiving a delete code (octal 177)* on

input

data lines

551-DS7

generates a

low

DCPRM

output

at

LSI chip ME5-8. Signal DCPRM then generates a 100-400

usec

PRIME

pulse

out

of

LSI chip ME9-37.

E.

Input

Prime -Reception

of

a

low

INPUT

PR

IME level

at

the interface

connector

generates a

high IP signal

into

LSI

chip

ME5-36. This produces a

low

DCPRM

output

at

LSI

chip

ME5-8

(same

as

the delete code),

which

in

turn

generates a 100-400

usec

PR

IME pulse

out

of

LSI

chip ME9-37.

In all

of

the

above

cases,

the high

PR

IME signal

out

of

LSI chip ME9-37 resets the

printer

logic

including the

shift

register and places a

dummy

character in the

first

character

position

in

the

register.

A diagram

of

the

prime

timing

is

shown in Figure 4-2.

PRIME_--..F

...

---..-----

100-400

us

..

,

!-I-----

I

SRCL

___

....r ;

L_

LOAD

DUMMY

CHARACTER

*'

I

-

8usec

I

CLKTB2

I

20-30

us

..

~

Figure 4-2. PRIME

TIMING

The high

PR

IME signal

into

pin 3

of

the

two

shift

register elements (ME18 and ME19) disables

all

inputs

to

these elements and

internally

resets all

stages

of

the

shift

register. When

PR

IME

goes

low,

recirculate signal

SRCL

from

LSI chip ME9-38 remains high and a single

CLKTB2

pulse

is

generated at

ME9-36. The high

SRCL

(and

low

PRIME) connect

shift

register

outputs

TB1-TB7

back

to

inputs

DS1-

DS7, and enables a high

(+5V)

input

to

stage

8.

Note

that

since

the

shift

register

uses

inverted signals

for

both

inputs

and

outputs

(e.g.,

DS

1 and

TB

1), a high

input

to

stage

8 represents a ZE

RO

into

that

stage.

The single

CLKTB2

pulse then clocks a

dummy

character

into

the register (i.e., ON

ES

into

stages

1-7 and a

ZERO

into

stage 8).

*Throughout

this section,

input

codes are defined

only

by

their

first

seven

bits. However,

bit

8

into

the

function

decoder contained in LSI chip 5

must

be

a ON

E.

4-3

Centronics 101AL Guide

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