Centronics 306 User manual

MODEL 306 PRINTER
MAY 1977
Centronics No. 37400040- Rev. I
CEnTRoniCS
data computer corp.
HUDSON, NEW HAMPSHIRE 03051
TELEPHONE [phone]

MODEL
306
PRINTER
REVISION I
MAY 1977
THE INFORMATION CONTAINED HEREIN IS
PROPRIETARY AND IS NOT TO BE RELEASED
OR REPRODUCED WITHOUT WRITTEN PER-
MISSION OF CENTRONICS data computer corp.
I:EnTROnll:S
data computer corp.
HUDSON, NEW HAMPSHIRE 03051
TELEPHONE [phone]

TABLE OF CONTENTS
SECTION
11.1
11.2
1.3
1'.4
1.5
2.1
2.2
4.1
4.2
4.3
4.4
4.5
4.6
4.7
General Description. . . .
Logic
Flow Diagram. . . .
Printer Operation
1.3.1 Character Printing
1.3.2
Paper Movement . .
1.3.3 Special Functions
Specifications Summary .
Physical Description
SECTION 1
INTRODUCTION
SECTION 2 AND 3
INSTALLATION AND OPERATION
Site Preparation .
Shipping Crate. .
Introduction . . .
Basic Timing . . .
Initializing the
Printer. .
4.3.1 Prime . . . .
4.3.2 Select/Deselect
SECTION 4
THEORY OF OPERATION
Data Input . . . . .
4.4.1 Data
Input Timing .
4.4.2 Busy
4.4.3 Decoders. . . .
Data Storage . . . . . .
4.5.1 Timing
of Up Counters and Ram Elements. .
Character Printing . . . . . . . . .
4.6.1 Initiating Printing . . . . . .
4.6.2 Character Registration and Timing .
4.6.3 Character Generator (ROM)
4.6.4 Print
Head Operation
4.6.5 Power Driver Circuit
Paper Movement . .
4.7.1 Line
Feed
4.7.2 Form Feed .
4.7.3 Vertical Tab
4.7.4 Vertical Format
Unit (Optional)
4.7.5
Bottom of Form Detection (Optional)
4.7.6 Line
Feed Solenoid Driver . . . . .
PAGE
1-1
1-2
1-3
1-3
1-4
1-5
1-5
· 1-7/1-8
2-1
2-2
. 4-1
4-1
4-1
4-3
.. 4-3
· .
4··4
4-5
4-5
4-7
.4-10
.4-10
.4-12
.4-14
.4-15
. 4-21
.4-22
.4-23
.4-24
· .4-24
.4-26
.4-27
.4-27
.4-28
.4-29

TABLE OF CONTENTS (CONT'D)
SECTION PAGE
4.8
4.9
4.10
5.1
5.2
6.1
6.2
6.3
6.4
Special Functions
4.8.1 Bell (Option)
4.8.2
Delete. . .
4.8.3
Paper Empty
4.8.4 Motor Control (Optional)
Power Supplies . . . . . . . .
4.9.1
+5V Regulator. . . . .
4.9.2 +12 V and -12 V Regulators.
4.9.3 +35 V Power Supply (Unregulated) .
LSI Elements Inputs/Outputs. . . . . .
SECTION 5
.4-30
.4-30
.4-30
· ...... 4-30
.4-30
.4-33
.4-33
. ......... 4-33
·
....... 4-33
..... 4-37
REMOVAL, REPLACEMENT AND ADJUSTMENT PROCEDURES*
Introduction . . . . . . .
Mechanical Assemblies
Carriage Mechanism.
Platen . . . . . .
Paper Pan
Driving Mechanism
Driving Mechanism
Idler Pulley Assembly
Reed Switch
Printer Base.
Frame. . .
.
5-1
. . . . . 5-1
. . . 5-1
5-4
. 5-5
. . . . . . 5-7
· . 5-9
. . . . . . . . . . .
.5-12
.5-14
· . . . . . .5-16
· . . .. .5-17
. . . . . . . . . . . . . .5-18
-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
5.2.14
5.2.15
5.2.16
5.2.17
5.2.18
5.2.19
5.2.20
5.2.21
Paper Feed .
Pin Feed Unit
Ribbon Feed
Cover . . .
Operator
Panel
. . . . . . .5-20
. . . . . . . . . . . . .5-23
Electrical Components
Electrical Components
Electrical Components
Print
Head and Associated Assemblies.
Motor Control Assembly Option. . .
Vertical Format
Unit (VFU) 63060125-500:~ Option.
Printer Drive Mechanism, Model 306 ..... .
SECTION 6
Electrical Adjustment . . . .
Series
300 Preventive Maintenance .
Recommended Tools .
Troubleshooting Guide . . .
SECTION 7
· . . . . . . .5-31
· .5-31
...... 5-32
· ....... 5-32
·
....... 5-33
· .5-33
· .5-37
. ... 5-38
.5-39
. . 6-1
. 6-1
.. 6-5
6-6
DRAWINGS
AND LISTS OF MATERIAILS, ELECTRICAL
ii

A
B
SECTION 8
MECHANICAL DRAWINGS AND PARTS LISTS
Logic Board Timing. . . . .
Parallel Interface Specifications .
APPENDICES
LIST OF ILLUSTRATIONS
· A-1
B-1
FIGURE
PAGE
1-1
1-2
1-3
1-4
1-5
2-1
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
4-16
4-17
4-18
4-19
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
Model
306 Printer (Top and VFU Covers Removed)
Basic Block Diagram
Pri nti ng the Letter (H)
Print Head Components
Paper Movement Mechanism
Printer Dimensions . . . .
Model 500 Block Diagram
USASCII Code . . . . .
Data
Input Timing ....
Ti mi ng when Stori ng Data .
Timing of RAM Addressing During Print Cycle
Forward Clutch Interconnection Diagram. . . . . . . . .
1-2
'-2
1-3
1-3
1-4
2-1
4-2
4-4
4-6
· 4-11
.4-13
.4-15
Block Diagram Character Registration and Timing .. ..... .
.4-16
.4-17
.4-20
.4-22
Character Timing. . . . . . . . . . .. . . . . . .
DCW Timing, Normal and Elongated Characters . . . . .
Print Head Timing . . . .
Single Line Feed Timing . . . . . .
Double Line Feed
Timing . . . . .
Form Feed and Vertical Tab Timing
Schematic -Vertical Format Unit .
Timing During Bottom of Form Function
Motor Control Timin~l. . . . . . . . . .
+5V Regulator Interconnection Diagram. .
+12V and -12V Regulator Interconnection Diagram
+35V Unregulated Supply Interconnection Diagram
Carriage Movement
Adjustments. . . . . . . .
Adjustment of Timing Belt . . . . . . . . . .
Adjustment of Timing Belt (View from back of Printer, Forward)
Main Motor Belt Adjustment . . . . . . . . . . . . . . .
Bushing End-Play
Adjustment for Forward Clutch Shaft, (Preload Clutch)
Location
of Drive Pulley Bracket . . . .
Torque Limiting Device (Brake) . . . . . . . . .
Reed Switch Assembly, Left . . . . . . . . . .
Left Reed Switch Static-Adjustment . . . . . . .
Two Adjustment, Paper Feed Mechanism
Adjustment for Paper Holder Gate . . . .
Removal
of Belt (32) Idler Slide (28), and Drive Pulley (26) . . . .
Locating
Idler Pulley Assembly . . . . . . . . . . .
iii
.4-25
.4-26
.4-26
... 4-28
.4-29
· .4-32
.4-34
· .4-35
.4-36
..... 5-4
· 5-8
.... 5-9
· 5-11
· 5-11
.5-12
.5-14
.5-15
· .5-16
.5-19
· .5-20
.5-22
. 5-25

LIST OF ILLUSTRATIONS (CONT'D)
FIGURE PAGE
5-14
5-15
5-16
5-17
5-18
5-19
5-20
5-21
5-22
5-23
5-24
5-25
5-26
5-27
5-28
5-29
6-1
6-2
6-3
6-4
6-5
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
8-i
8-1
8-2
8-3
8-4
8-5
8-6
8-7
Locating Dimension for Ribbon Feed Rack . . . " . . . . . . . . . . . . 5-26
Rack and Pinion Adjustment, Ribbon Mechanism . ., . . . . . . . . . . . .5-26
Locating Dimension for Left Ribbon Holder Plate with Respect to Rear Guide Bar . 5-27
Locating Dimension for Right Ribbon Holder Plate with Respect to Rear Guide Bar. 5-28
Left Operator and Stopper Adjustment . . . . .
Ribbon Feed Plate and Guide Bar (Left Side). . . . . . . . . . .
Adjusting Nuts for Right Pawl Operator Movement . . . .
Right Pawl Operator Starting Position. . . . . . . .
Pawl, Ratchet and Cam Movement . . . . . . . .. . .
Spur on Left Releaser (A L-174) and Roller (A L-146) .
Establishing Timing Fence Location and Parallelism
Fence Adjustment and Optics Housing . . . . .
Vertical and Horizontal Alignment of Single Track Optics Housing
Motor Control Location and Installation. . . . . . . . . . .
Paper Tape Reader Adjustment . . . . . . . . . . . . .
Location of Subassemblies/Parts by Figure or Symbol Reference
Carriage Assembly and Timing Fence
Paper Feed Assembly . . "
Ribbon Feed Assembly . " . . .
Idler and Ribbon Feed Drive . . . . . . . .
Drive Assembly . . . . " . . . . . . . .
Schematic Diagram, Logic/Power Supply Board, 300/fiOO Series .
Schematic Diagram, Power Driver Board (Sheet 1 of 2t . . .
Schematic Diagram, Power Driver Board (Sheet 2 of 2t . . .
Schematic Diagram, Video Amplifier . . . . . . . .
Schematic Diagram, Interconnection Diagram, Connector Card
Schematic Diagram, Multitap 50/60 Hz Transformer . .
Wiring Diagram, Printer Mechanism. . . . . . . . . . .
Schematic Diagram, Elapsed Timing Indicator (Option) . . .
Logic/Power Supply Board Connections. . . . . . . . .
PC Board Assembly, Logic/Power Supply Board, 300/S00 Series (Sheet 1 of 2) .
PC Board Assembly, Logic/Power Supply Board, 300/S00 Series (Sheet 2 of 2) .
PC Board Assembly, Power Driver Board
PC Board Assembly, Video Amplifier . . . . . . . .
PC Board Assembly, Connector Card . . . . . . .
PC Board Assembly, Elapsed Time Indicator (Option)
Cable Assembly, Data Input . . . . . . .
Cable Assembly, Computer I nput Cable (W2)
Model 306 Subassemblies
Carriage - AA . . . . . . . .
Platen - AB . . . . . . . . .
Paper Pan - AC . . . . . . .
Driving Mechanism (Part 1 ) - AD
Driving Mechanism (Part 2) -AE .
Idler Pulley - AF
Reed Switch -AG . . . . . .
iv
.. 5-28
· .5-29
.5-29
· .5-30
.5-30
· .5-31
· .5-35
· .5-36
.5-36
· .5-37
.5-39
.5-40
6-3
6-4
6-4
· . 6-5
6-5
· 7-3/7-4
· 7-5
7-6
7-7
· . 7-8
· . 7-9
.7-10
· 7-11
.7-12
· 7-13
· .7-14
· 7-19
· 7-21
.7-23
.7-25
· .7-29
· 7-31
· 8-3
· 8-5
· 8-7
8-9
.8-11
· .8-13
.8-15
.8-17

LIST OF ILLUSTRATIONS (CONT'D)
FIGURE
8-8
8-9
8-'10
8-11
8-12
8-13
8-14
8-15
8-16
8-17
8-18
8-119
8-20
Base - AH
FrCllme - AI
Paper Feed -AJ
Pin Feed Assembly and Paper Drive
Shaft
Ribbon Feed - AL (Part 1 of 2)
Ribbon Feed - AL (Part 2 of 2)
Cover - AM ....... .
Operator Panel - AN . . . .
Multitap Transformer and Electrical Components (Part 1 of 3) - AO
Electrical Components (Part 2 of 3) -AP
Electrical Components (Part 3
of 3) - AQ
Print Head and Associated Assemblies.
Vertical
Format Unit (Option) . . . .
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 level indications
at the lower right-hand corner
of a page reflect at what revision of the manual that
page was updated.
v/vi
PAGE
.8-19
.8-21
.8-23
.8-25
.8-2"1
.8-28
.8-31
.8-33
.8-35
.8-37
.8-39
.8-41
.8-43

SECTION 1
INTRODUCTION
This manual describes the Model 306 printer, manufactured by Centronics Data Computer Corp-
oration. It provides general information, detailed theory of operation and maintenance information
enabling field service personnel to service the printer. For serial input or other detailed interface
information, a separate document for each interface is published for your reference.
The manual
is subdivided into eight sections, each with its specific purpose.
SECTION 1
SECTION 2
SECT10N 3
SECTION 4
SECTION 5
SECTION 6
SECTION 7
SECTION a
APPENDIX
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 instructions for the
printer.
OPE RATION, describes the use of alt operator controls and indicators.
THEORY OF OPERATION, contains a detailed description of each major
operation performed by the printer electronics, including flow charts,
timing diagrams and circuit diagrams.
REMOVAL, REPLACEMENT AND ADJUSTMENT PROCEDURES, includes
step-by-step removal and replacement procedures for all major assembl ies and
sub-assemblies in the printer.
MAl NTENANCE, includes electrical adjustments, preventive maintenance proc-
edures, and a troubleshooting guide.
ELECTRICAL DRAWINGS AND LIST OF MATERIALS, contains a complete
set of schematic, wiring and component board layout diagrams and their assoc-
iated list of materials for the electrical portion of the printer.
MECHANICAL DRAWINGS AND PARTS LISTS, includes all printer assembly
drawings and
their associated part lists for the mechanical portion of the printer.
(A) Logic Board
Timing
(B) Parallel Interface Timing
1.1 GENERAL DESCRIPTION (Figure 1-1)
The Model 306 printer is a medium speed impact printer which uses a standard 5 x 7 or optional
9 x 7
dot matrix for character generation.
The
unit prints at a rate of 120 characters per second, which is approximately one full aO-chara-
cter line per second (including carriage return time). Paper
is sprocket-fed, and paper widths from 4
inches to 9% inches (10.2 cm -24.1 ~m) can be accommodated. The printer can produce one original and four
copies. Standard print format consists of 10 characters per inch .horizontally and 6 lines per inch vertically.
1-1
Rev. H

Figure 1-1. MODEL 306 PRINTER (TOP AND VFU COVERS REMOVED)
1.2 LOGIC FLOW
DIAGRAM (Figure 1-2)
The standard
printer contains an 80-character buffer. For serial data inputs, optional serial
interfaces allow,data to be received at rates from 100 to 9600 baud: Several other optional inter-
faces are available as required by the user.
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 energiz1e the print head solenoids causing
the
print wires to form the character on the paper.
TIMING
FENCE
CONTROL
AUDI J
ALARM
(OPTIONAL)
HEAD MOTION
CONTROL
CLUTCH
DATA_,--~
INPUT
1. PRINT COMMAND
(CR OR LAST CHAR.)
2. PAPER MOVEMENT
(LF, VT, FF)
PAPER MOTION
PAPER
MOVEMENT
SOLENOID
Rev. H
3. SPECIAL FUNCTIONS
(BELL, DELETE, EXP.
CHAR)
MEMORY
CONTROL
TIMING
WRITE
PULSES
Figure 1-2. BASIC BLOCK DIAGRAM
1-2
PRINT
HEAD

Paper movement is initiated by a line feed, vertical tab and form feed function. In the standard
306 printer, vertical form movement is software controlled by means of line count pulses, rather than
Ihardware -controlled. However,
an qption Vertical Format Unit (VFU) is available for hardware-
controlled vertical
formatting, identical to the Series 100 printers.
In addition, the
printer recognizes the following special control codes: bell, delete and elongated
character,
as described in Section 1.3.3.
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 bell, delete, etc.
1.3.1 CHARACTER PRINTING (Figures 1-3, 1-4)
A small aluminum carriage supports the print head assembly. During printing operation, the
carriage travels along the
print line from left to right. Printing is accomplished by selectively firing
the print wires 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 that they are flush with the surface of the jewel. Each solenoid can fire independently up to five times.
for anyone character. Figure 1-3 shows an example of the dot matrix forming the letter H. All
character formation in the 5 x 7 and 9 x 7 standard ASCII character set are shown in the Series 300
Operator Manual.
PRINT
HEAD
JEWEL
Figure 1-3. PRINTING THE LETTER (H)
1-3
PRINT WIRES
A~
A
Figure 1-4. PRINT HEAD COMPONENTS
Rev. H

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 inside the print
head but aligned vertically at the nose (Ref. Fig. 1-3, 1-4). The frEle 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 pass
through the correct hole in the print jewel.
Printing action
is initiated when the input buffer has been filled or a carriage return (CR) code
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 aD-column limit switch. At this time, the print head returns
to the left margin and an automatic line feed is performed. As an option, the automatic line feed
can be disabled.
1.3.2. PAPER
MOVEMENT (Figure 1-5)
Paper can be moved manually by rotating the platen knob or automatically by any of three paper
movement commands: Line feed, vertical tab and form feed.
PIN FEED
BELT UNIT
iLiNE FEED
iSOLENOID
, ..... ---"r-APER FEED KNOB
Figure 1-5. PAPER MOVEMENT MECHANISM
Power to drive the pin feed belt units controlling paper movement, is transmitted from the main
motor through an O-ring belt to the form feed mechanism, where it is then transferred via the paper drive
shaft
to drive pulley for pin feed belt units. The form feed mechanism consists of a form feed or release
clutch, a line feed solenoid with slide unit, and a gear train mechanically linking the main motor to the
paper feed tractors.
To initiate a single line feed, the line feed solenoid is momentarily energized. Upon completion
of the line feed command, a delay interval is generated, allowing the clutch pawl and clutch mechanism
to return home before another line feed is allowed.
Rev. H 1-4

/
Vertical forms movement is accomplished by applying a DC level to the paper feed solenoid.
In
the standard 306 printer, this paper movement continues until it is either terminated by the rec-
eption of a delete code (octal 177) or an INPUT PRIME signal at the interface connector, or a paper
time-out condition. However, if the optional Vertical Format Unit (VFU) is used, the paper movement
is terminated when a hole is detected in the appropriate channel of the vertical format paper tape.
As paper moves in
the printer, each line advance causes a line count switch located in the form feed
mechanism
to open and close. -rhe two wires from this switch go to the interface connector via the
logic card. As a result, a line count level from the input device is switched on and off by the printer
for each line advance. If the 306 contains no optional VFU, the user's software can control vertical
formatting by counting these line count pulses and terminating the paper movement operation when
appropriate.
When
the printer runs out of paper, a sensing switch activates a two-second audible tone in a speaker
(option) located at the rear. The printer also stops printing and lights the PAPER EMPTY light on the
control panel.
1.3.3
SPECIAL FUNCTIONS
In addition to the printable characters and the carriage return, line feed, form feed, and
verticall
tab codes previously described, the printer also recognizes the following special control
codes.
DE)lete (Octal 177) -Primes the printer electronics and clears the buffer.
Bell (Octal 007) - With Bell option only -Generates a two-second audible tone in the speaker
at the front of the printer.
Select (Octal 021) - Allows printer to receive data, same as activating SE LECT switch.
De-Select (Octal 023) - Inhibits printer from receiving data, same as deactivating SE LECT switch.
Elongated Boldface Characters (Octal 016) -Prints elongated characters on a line-by-line basis
(character-by-character
controlled by bit 8, optional).
1.4 SPECIFICATIONS SUMMARY
Data Format
Input Code
Data Rate
Buffer
I nput Gating
Data
Input
1-5
7-bit parallel interface
8
bits (optional)
64-character ASCII
Up to 75,000 characters/second
One-line character
buffer
Data Strobe is normally gated with
Acknowledgeof previous character.
Non-gated strobe available
as an option.
Rev. H

Rev. H
Printing
Printing Method
Dot Matrix
Elongated Characters
Character Density
Print Format
Print Rate
Number of Copies
Character Sets
Paper Advance
Slew Rate
Vertical
Format
Vertical Format Control
Paper Entry
Paper Ti meout
Paper Feed
Auto Line Feed
Impact, character-by-character
5 x 7 (std.), 9 x 7 (opt.)
By line, via octal
016
By character, via bit 8 (opt.)
10 characters/inch (horizontal)
80-characters/line (max.)
120 characters per second
Prints original and up
to four carbon
copies.
Standard 64-character
ASCII, lower case
prints as upper case. Optional sets up
to 128 characters, available.
4 inches/second
6 lines/inch
2-Channel paper tape (opti'on)
Bottom and Rear Paper Feed
'IO-second Paper Runaway Inhibit
Sprocket Feed, adjustable to 9% inch (24cm) paper.
Automatic line feed on carriage return
Disabled
by option.
Control s/Indicators
Switches
Indicators
Manual Controls
Auto Motor Control (Opt.)
Audio Alarm (Opt.)
ON/OFF, SELECT, FORMS OVERRIDE
TOP OF FORM (OPT.) MANUAL LF (OPT.)
SINGLE!DOUBLE LF (OPT.)
ON/OFF, SELECT, PAPER OUT
Forms, Thickness, Paper Aldvance Knob
Drive motor automatically turns off and
on
as required by the incoming data.
Momentarily sounds a buzzer in response
to a Bell code or paper Hmpty condition.
Physical/Environmental/Electrical
Height
Depth
Width
Weight
T em peratu re
Input Voltage
12-% inches (32.4 cm)
18-% inches (47.6 cm)
23-% inches (59 cm)
66 pounds (30 kg.)
40
0
to 100
0 F (40
to 37.5° C) (Operating)
-400
to 1600 F (-400 to 71°C) (Storage)
115
VAC ±10%, 60 Hz (Std.)
230 VAC ± 10%,50 Hz (Opt.)
1-6

Other Options
Auto Carriage Return on Line Feed, Vertical Tab and Form Feed
Bottom of Form
I
nhibit Delete Code
Serial Communications Interface
Popular Parallel Computer Interfaces
Ribbons
The
printer uses a 1-inch nylon ribbon mounted on 3-inch diameter spools. The following
four colors are available:
Black -Part No. 63002293-5001
Red -Part No. 63002293-5002
Green- Part No. 63002293-5003
Blue -Part No.
63002293-5004
Centronics nylon ribbons are designed specifically for use in Centronics matrix printers.
The fabric design and
proprietary ink formulation ensures optimum print quality, as well as
long print head and ribbon life.
Note: Centronics
reserves the right to void the warranty with
regard to any parts damaged through the use of non-
qualified ribbons.
Paper
The
printer used continuous form paper with standard feed holes on each edge. Paper widths
from 4 to 9% inches (10.2 cm -24.1 cm) can be accommodated by the printer. Using multiple-part
form, one original and up to 4 copies can be printed, all very legible. Paper weight specifications are
as follows:
Single-Part Forms:
Multiple-Part Forms:
Carbon Paper:
1.5
PHYSICAL DESCRIPTION
15t0121b.
Original -12 to 15 lb.
Copies - 9
to 12 lb., last copy 15 lb.
(Maximum
of five parts)
7% lb. with medium hardness
The
printer is approximately 12-%"(32.4 cm) high by 18-%"(47.6 cm) deep by 23y;'(59 cm) wide, and
weighs
approximately 66 pounds (30 kg.). The complete printer is assembled on a base made of cast alum-
inum. Enclosin~ the printer are three removable plastic covers: the main cover, top cover and VFU covet.
The top cover can be opened to give access to the print head by tilting the cover back and lifting it complete-
ly off the printer. The VFU cover can also be tilted back or removed for access to the optional Vertical
Format Unit, if it is used.
Figures 1-6
to 1-9 are different photographic views of the printer taken with the covers removed. All
major assemblies are identified, in addition to a few other important components, the locations of which
should be noted.
1-7 Rev.
i-i

1. Print Head Assembly 5. Damper Piston
10. Pin Feed Mechanisms
2. Video Ampl. and Cable Ass'y
6. Operator Panel
11. Paper Feed Shaft
3. Carriage
4. Ribbon Cable
1.
Main Drive Motor
2. Drive Mechanism
3. Forward Clutch
4. Reed Switch (EOP)
7. Damper Cylinder
12. Platen
8. Left Ribbon Feed
13. Platen Knob
9. Vertical Format Unit Option
14. Right Ribbon Feed
Figure 1-6. LEFT FRONT VIEW OF 306
5. Main Drive Belt
G. Timing Fence
7. Carriage
Return Spring
8. Power Driver Board
9. Optical Block
10. Penetration Control Knob
11. Form Feed Mechanism
12. Solenoid Finger Board
Figure 1-7. RIGHT FRONT VIEW OF 306
1-8
REV. H

1. Logic/Power Supply Board
2. Logic/P.5. Fuses
3. AC and 35 V I nput Connector (J 1)
4. DC Output Connector (J2)
7. AC Power Input
8. Input Cable (W2)
9. Motor Control Option
10. Line Feed Solenoid
5. Input Connector
11. Line Count Switch
6. In-Line Fuse
Figure '-8. REAR VIEW OF 306
1. 35V Power Supply
5. Paper Out Switch
2. Power Transformer 6. Main Printer Harness
3. DC Output Connector (J2)
4. AC and 35 V I nput Connector (J 1) 7.
Motor Starting Capacitor
Figure '-9. REAR VIEW OF 306 (LOGIC/P.S. BOARD REMOVED)
REV. H 1-9/1-10

SECTIONS 2 AND 3
INSTALLATION AND OPERATION
A separate Series 300 Operators Manual contains most of the installation, set-up and operating
procedures
for the Model 306 printer. Reference should be made to this Operators Manual during
normal printer installation and operation.
Included on
the following pages is additional information not contained in the Operators Manual.
~~.1 SITE PREPARATION (Figure 2-1)
A line drawing of the printer dimensions is shown in Figure 2-1.
1
12.82"
MAIt_-----rl
I
23.17" MAX.
WEIGHT: 66 POUNDS'
Figure 2-1. PRINTER DIMENSIONS
Environmental and electrical requirements at the installation site are as follows:
T em peratu re :
Humidity (%RH):
Electrical:
40
0
to 1000F (40 to 37.5
0) (operating)
-40 0
to 160
0 F (-400
to 71
0C) (storage)
5% to 90% (no condensation) -operating
0% to 95% -storage
115 VAC ±
10%,60 Hz
230 VAC ± 10%,50 Hz
2-1
Rev. H