Centronics 101A User manual

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MODEL101A PRINTER
MAY 1978
Centronics No. 37400020 Rev. K
I:EnTROnll:S
. data computer corp.
HUDSON, NEW HAMPSHIRE 03051
TELEPHONE (603) 88_3 -0111

MODEL 101A PRINTER
MAY 1978
REVJSION K
THE INFORMATION CONTAINEO HEREIN IS
PROPRIETARV AND IS NOT TO BE.RELEASED
OR REPRODUCED WITHOUT WRITTEN PER-
MiSSiON OF CENTRONICS data computer COJp.
I:EnTRDnl1:5
data computer corp.
HUDSON .. NEW HAMPSHIRE 03051
TELEPHONE [phone]

TABLE Of CONTENTS
Section
1.1
1.2
1.3
SECTION 1
INTRODUCTION
GENERAL DESCRIPTION (FIGURE 1-1).
lOGIC FLOW DIAGRAM (FIGURE 1-2) .
PRINTER OPERATION. . . . . . .
1.3.1 Character Printing (Figures 1-3, 1-4) .
1.3.2
Paper Movement (Figure 1-5). .
1.4
1.5
SPECIfICATIONS SUMMARY. .
PHYSICAL DESCRIPTION
SECTIONS 2 AND 3
INSTALLATION AND OPERATION
·2.1 SITE PREPARATION (FIGURE 2-1). .
2.2 SHIPPING CRATE. . . • . . .
2.3
PAPER GUIDE AND STACKER ASSEMBLY.
SECTION 4
THEORY OF OPERATION
4.1
INTRODUCTION (FIGURES 4-1 AND 4-2) · ·
4.2 BASIC TIMING (SEE FIGURE 4-3). ·
4.3
INITIALIZING THE PRINTER
· · ·
. ·
· · ·
· 1-2
· 1-2
1-3
· . 1-3
· 1-4
· 1-5
· . . 1-7
· 2 .. 1
· 2-2
• • 2 .. 3/2-4
· 4-1
· 4-3
· 4-3
4.3.1
Prime Circuit (Figure 4-4, Timing;
Figure 4-5,
Circuit). . . . . • . · · · · · ·
4-4
4.3.2 Select Circuit (Figure 4-6). · ·
4-6
4.4 LOADING DATA
. . . . · · · · · · · ·
4-9
4.4.1 .
General
(Figure 4-7/4-8). · · · · · ·
4-9
4.4.2
Data Strobe . . · · · · · · ·
4-9
4.4.3
Acknowledge (Figure 4-9). . · · · · ·
4-12
-i-
--REV. J

TABLE OF CONTENTS (cont'd)
Section
4.4.4
Busy Timing (Figure 4-10, Timing; Figure 4-11,
Circuit) • . . . . . . . . .. . 4-12
4.4.5 Clocking Input
Data into the Buffer (Figure
4-7, 4-12). . . . . . . . 4-14
4.4.6 Function
Decoder (Figure 4-12) . . 4-16
4.5
CHARACTER PRINTING (FIGURE 4-13) . ·
4-17
4.6
.
4.5.1 Initiating the'Printing Operation (Figure 4-14)"". 4-17
4.5.2 Print Head Motion (Figure 4~14; Schemattc -
Section 7). . . . . . . . . . . . . . 4-19
4.5.3 Character Registration
and Timing (Figure 4-15,
Timing; Figure 4-16, Circuit) .'. .' 4-19
4.5.4 Character Generator
(ROM -Figure.4-16) . 4-23
4.5.5 Print Head Operation (Figures 4-18, 4-19). . 4-24
4.5.6
Power Driver Circuits (Schematic, 'Section 7) .. 4-26
4.5.7 Terminating the Printing Operation. .
4-27
PAPER MOVEMENT
. · 4-28
4.6.1
tine Feed
(Figure 4-21, Circuit; Figure 4-22,
Timing) . · · . ·
~
· · · · ·
4-28
4.6.2
Form Feed
(Figure 4-2~r,
Circuit; Figure 4-24,
Timi ng) . · · . · . · · · · · . 4-30
4.6.3 Vertical
Tab (Figure 4-23, Circuit;
Figure 4-24;
Timi ng) . · · . . . .
.- . 4-32
4.6.4 Vertical
Format Unit
,;.'
4-33
. · . · · · · ·
4.6.5 Paper
Time Out Circuit. (Figure 4-21) '.
." · ',,4-34
4.6.6
Line Feed Solenoid Driver (Schematic -Section 7). 4-34
4.7
SPECIAL FUNCTIONS.
· 4-34
4.7.1 Bell (Figure
4-.25) .
4.7.2 Delete
.... ". .
4.7.3 Paper
Empty (Figure 4-26).
4.7.4
Motor Control (Optiopal). .
4.7.5 Fault Circuit (Figure 4-30) ·,
· 4-34
4-34
· 4-36
· 4-36
· 4-40
4.8
POWER SUPPLIES (FIGURE 4-31, SCHEMATICS -.SECTION. 7) . . 4-40
REV. J
4.8.1 +5V Regulator (Schematic #63011143) . . . .
4.8.2+12V and.-12V Regulptors (Schematic #63002308).
4.8.3 +35V Power Supply, Unregulated. . .
-ii-
· 4-43
· 4-44
· 4-44

TABLE OF CONTENTS (cont'd)
Section
SECTION 5
REMOVAL, REPLACEM~NT AND ADJUSTMENT PROCEDURES
5.1 INTRODUCTION.
· 5-1
5.2 MECHANICAL ASSEMBLIES. . 5-1
5.2.1 Cover (Figure A). . . . . . . 5-1
5.2.2 Carriage Mechanism (Figure HA). . . . . . . 5-2
5.2.3 Driving
Mechanism (Figure 8-4 and Figure 8-5). . 5-6
5.2.4 Spring
Drum (Figure HC) . . 5-16
5.2.5 Damper (Figure HD) . . 5-17
5.2.6 Frame (Figure HE) . . . 5-18
5.2.7 Paper Feed Mechanism (Figure HF) . . 5-24
5.2.8 Pin Feed Unit (Figure 8-8) HG . . 5-26
5.2.9 Form Feed Mechanism (Figure HH). . 5-31
5.2.10 Ribbon Feed Mechanism (Figure HI) . . 5-35
5.2.11 Electrical Hardware (HJ) . . 5-44
5.2.12 Paper Stacker and Guide .. . 5-45
5:2.13 Print Head and Associated Assemblies. . 5-45
SECTION 6
MAINTENANCE
6.1 ELECTRICAL ADJUSTMENTS (MODEL 101/101A).
6.1.1 Video Amplifier Adjustment (Series 100)
6.2 MECHANICAL ADJUSTMENTS .
6.3
PREVENTIVE MAINTENANCE (P.M.) .
6.4
TROUBLESHOOTING GUIDE
6.5 RECOMMENDED TOOLS.
SECTION 7
ELECTRICAL DRAWINGS lAND LISTS OF MATERIALS
SECTION 8
DRAWINGS AND PARTS LISTS, MECHANICAL .
-iii-
· 6-1
· 6-1
· 6-2
· 6-2
· 6-4
· 6-6
·
7-1
· 8-1
REV. J

REV. J
Figure
1-1
1-2
1-3
1-4
1-5
1-6
1-7
1-8
1-9
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
4-20
4-21
LIST OF ILLUSTRATIONS
Model lOlA Printer (Front Cover Removed).
Basic Block Diagram.
Printing the Letter (H)
Print Head Components .
Paper
Movement Mechanism.
Left Front
View of lOlA Printer.
Right Front View of lOlA Printer .
Rear View of lOlA Printer.
Rear View (lOlA Electronics Cavity Removed).
Printer Dimensions .
Model lOlA Functional Block Diagram .
Functional
Flow Chart .
Basic
Timing Circuit .
Prime Timing .
Prime Circuit.
Select Circuit .
Input
Data Timing - No Busy Condition.
Data Input Circuit .
Acknowledge Circuit.
Input Data Causing Busy .
Busy Circuit.
Function Decoder.
Character Printing Block Diagram .
Forward and Reverse Clutch Drive Circuits
Character Timing.
Character Registration
and Timing Circuit .
Normal and Elongated Characters.
Solenoid Positions, 1 through 7.
Print Head Timing
Power Driver Waveform .
Line
Feed Circuit .
-iv-
Page
· 1-2
· 1-3
· 1-4
· 1-4
· 1-4
· 1-8
· 1-8
· 1-9/1-10
1-9/1-10
·
2-1
· 4-1
· 4-2
· 4-3
· 4-4
· 4-5
·
4-7
· 4-9
· 4-10
·
4-11
· 4-12
· 4-13
· 4-15
· 4-17
· 4-18
· 4-20
· 4-21
· 4-24
· 4-25
· 4-25
· 4-26
· 4-29

Figure
4-22 .
4-23
4-24
4-25
4-26
4-27
4-28
4-29
4-30
4-31
5-1
5-2
5-3
LIST OF ILLUSTRATIONS (cont'd)
Line
Feed Timing.
Form Feed and Vertical Tab Circuit.
Form Feed and Vertical Tab Timing
Bell Circuit.
Paper Empty .
Motor Control Mounting.
Motor Control Board Interconnection Diagram.
Motor Control Timing
Fault Circuit.
Power Distribution Diagram .
Series
101 Drive Train.
Main Motor Drive and Drive Belt Arrangements
Determining Backlash Adjustments, Shaft (HB-27)
..
Page
4-30
4-31
4-32
4-35
4-37
4-38
4-38
4-40
4-41
4-42
5-6
5-8
5-14
5-4 Use of Feeler Gauge for Backlash Adjustment, (HB-30,22) 5-14
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
7-1
Bushing End-Play Adjustment for Preload Clutch Shaft
(HB-50) .
Flexible Timing Fence Mounting, Series 101 .
Fence Adjustment 'and Optic Housing.
Vertical
and Horizontal Alinement of Single Channel
Optics Housing
Location of Left Reed Switch (Top View) .
Removal of Belt (32) Idler Slide (28), and Drive
Pulley (26)
Adjustment for Paper Holder
Gate .
Maintaining 5/8-in. (15.9
mm) 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 (HI-43, 59) .
Driving Slide Shaft A - Adjustment.
Ribbon Reversing Rod Adjustment
Ribbon Reverse Timing .
Schematic
Diagram, Electronic' Card #1 (Sheet 1 of 2).
-v-
5-16
5-20
5-21
5-22
5-23
5-28
5-29
5-30
5-34-
5-40
5-41
5-41
5-42
5-43
7-1
REV. J

Figure
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
7-24
7-25
7-26
7-27
7-28
7-29
8-1
8-2
8-3
REV. J
LIST OF ILLUSTRATIONS (cont'd)
Schematic
Diagram, Electronic Card #1 (Sheet 2 of 3).
Schematic
Diagram, Electronic Card #1 (Sheet 3 of 3).
Schematic Diagram, Electronic Card #2 (Sheet 1 of 3).
Schematic
Diagram, Electronic Card #2 (Sheet 2 of 3).
Schematic
Diagram, Electronic Card #2 (Sheet 3 of 3).
Schematic Diagram, Power Driver Board (Sheet 1 of 2).
Schematic
Diagram, Power Driver Board (Sheet 2 of 2).
Schematic
Diagram, Video Amplifier.
Schematic
Diagram, +5V Volt Regulator.
Schematic
Diagram, !12 V~lt Regulator.
Multitap 50/60
Hz Transformer .
Wiring Diagram, Printer Mechanism .
Interconnection
Diagram, Connector Board.
Schematic Diagram, Motor Control (Optional).
Schematic
Diagram, LED Tape Reader (Optional) .
Component Board Assembly, Electronic Card ,#1
Component Board Assembly, Electronic Card #2 .
Component Board Assembly, Power Driver Board .
Component Board Assembly, Video Amplifier .
Component Board Assembly, +5 Volt Regulator.
Component Board Assembly, ~12V Regulator
Component Board Assembly, Connector Card
Component Board Assembly, Motor Control (Optional)
"
Harness Assembly, Motor Control.
Electronic
C~vity Assembly
WI Harness Assembly
W2 Cable Assembly, Computer Input
W3 Power Cable Assembly
Mechanical Subassemblies Series 101
Cover Assembly - A .
Carriage
Mechanism - HA
-vi-
Page
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
7-21
7-23
7-25
7-27
7-29
7-31
7-33
7-35
7-37
7-39
7-41
7-43
8-3
8-5
8-7

Figure
8-4
8-5
8-6
8-7
8-8
8-9
8-10
8-11
8-12
8-13
8-14
LIST OF ILLUSTRATIONS {cont'd}
Page
Drive Mechanism - HB (Part 1), Series 101. . . 8-9
Drive Mechanism (Preload Clutches)(Part 2), Series 101 . 8-11
Spring Drum - HC 8-13
Damper - HD.
Frame - HE .
Paper Feed Mechanism ..
Pin Feed Mechanism (Left and Right) - HG .
Form Feed Mechanism - HH
Ribbon Feed Mechanism - HI.
Electrical Hardware - HJ
Print Head and Associated Assemblies
Note
Refer to the Engineering Change Notice
(ECN) sheets shipped with the printer
for changes made to the printer which
have not yet been incorporated into the
drawings in this technical manual. Al-
ways keep these Engineering Change
Notice sheets with the manual.
-vii-
· . 8-15
· . 8-17
· . 8-19
· . 8-21
8-23
· . 8-25
· . 8-27
· .
8-28
REV. J

SECTION 1
INTRODUCTION
This manual describes-the Model lOlA printer, manufactured by
Centronics Data Computer Corporation. It provides general information,
detailed theory qf operation and maintenance information enabling field
service personnel to service the printer. For serial input or other de-
tailed interface infonmation, 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
INTRODUCTION, introduces the reader to the scope
and content of the manual, and provides the reader
with a general description of the
printer.
Section 2 INSTALLATION, contains unpacking and installation
instructions for the printer.
Section 3 OPERATION, describes the use of all operator con-
trols and indicators.
Section 4 THEORY OF OPERATION, contains a detailed descrip-
tion of
each major operation performed by the
printer electronics, including flow charts, timing
diagrams
and circuit diagrams.
Section 5
REMOVAL, REPLACEMENT AND ADJUSTMENT PROCEDURES,
includes step-by-step removal and replacement pro-
cedures for
all major assemblies and sub-assemblies
in the
printer.
Section 6 MAINTENANCE, includes electrical adjustments, pre-
ventive maintenance procedures, and a trouble-
shooting guide.
Section 7
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.
Section 8 MECHANICAL DRAWINGS AND PARTS LISTS, includes all
printer assembly drawings and their associated parts
lists for the mechanical portion of the printer.
Appendices - (A) Signal Glossary
(8) Parallel Interface Specifications
1-1
REV. J

1.1 GENERAL DESCRIPTION (FIGURE 1-1)
The Model lOlA printer is a medium speed impact printer which
uses a 9 x 7 dot matrix for character generation.
Figure 1-1.
MODEL lOlA PRINTER (FRONT COVER REMOVED)
The unit prints at a rate of 165 characters per second, which is
approximately one full 132-character line per second (including carriage
return time).
Paper is sprocket-fed, and paper widths from 4 inches to
14-7/8 inches
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.
1.2 LOGIC FLOW DIAGRAM (FIGURE 1-2)
The standard printer contains a 132-character buffer. For serial
data inputs, optional serial interfaces allow data to be rece~ved at rates
from 100 to 9600 baud. Several other optional interfaces are available as
I requ i red by the user'.
REV. J
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.
1-2

HEAD MOTION
CLUTCH
CONTROL CONTROL
1.
PRINT COMMAND
DATA
(CR OR LAST CHAR.)
PAPER
INPUT
2.
PAPER MOVEMENT
PAPER MOTION
(LF, VT, FF)
CONTROL
MOVEMENT
3.
SPECIAL FUNCTIONS
SOLENOID
(BELL, DELETE, EXP.
TIMING
CHAR)
MEMORY
WRITE
PRINT
PULSES
HEAD
Figure 1-2 BASIC BLOCK DIAGRAM
Paper movement is initiated by a line feed, vertical tab and form
feed function. Vertical forms movement is hardware-controlled by a vertical
format unit (VFU) which controls vertical spacing by monitoring two
channels in a punched paper tape.
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 im-
pulses 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 fives times for anyone character. Figure 1-3 shows an example of the
dot matrix forming the letter H. Character formations for the standard 64
ASCII set are shown in the Series 100 Operators Manual. Other available char-
acter sets are shown in Printer Character Sets brochure (No. C332-20).
1-3
REV. J

PRINT
HEAD
JEWEL
A
JEWEL
PRINT WIRES
A~
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 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 132-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 auto-
matically
by any of three paper movement commands: line feed, vertical tab
and form feed.
PAPER
ADVANCE
/
,--
FORM FEED
HOLE
Figure 1-5. PAPER MOVEMENT MECHANISM
REV~ J 1-4

1.4 SPECIFICATIONS SUMMARY
Data Format
Input Code
Data Rate
Buffer
Input Gating
Printing
Method
Dot Matrix
Elongated Characters
Character Density
Print Format
Print Rate
Number of Copies
Character Set
Slew Rate
Vertical
Format
Vertical Format Control
Paper Entry
Paper
Timeout
Paper Feed
Auto Line Feed
Bottom of Form (Opt.)
Data Input
Printing
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
acknowledge of previous character.
Non-gated strobe available as an
option.
Impact, character-by-character
9 x 7
(std.), 5 x 7 (opt.)
By line, via octal 016
By character, via bit 8 (opt.)
10 characters/inch (horizontal)
132 characters/line (max.)
165 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.
Paper Advance
1-5
4 inches/second
6
lines/inch (Std.)
8 or 10 lines/inch (Opt.)
2-channel
VFU paper tape
Rear Paper Feed
Paper Runaway Inhibit
Sprocket feed, adjustable to 14-7/8
inch paper
Automatic
line feed on carriage return.
Disabled by option.
Controlled
by VFU tape, causes paper
to advance to top of form.
REV. J

Switches
Indicators
Manual Controls
Controls/Indicators.
ON/OFF, SELECT, FORMS OVERRIDE,
TOP OF FORM, MANUAL LF
ON/OFF, SELECT, PAPER OUT
Auto Motor Control (Opt.)
Forms Thickness, Paper Advance Knob
Drive motor automatically turns off
Audio Alarm
Height
Depth
Wide
Weight
Temperature
Input Voltage
and on as required by the incoming data.
Momentarily
sounds a buzzer in response
to a Bell
code or paper empty condition.
Physical/Environmental/Electrical
11~ inches
20 inches
27-3/4 inches
118 pounds
40~ to 100~F (operating)
-40 to
160 F (storage)
115 VAC!10%, 60 Hz (Std.)
230 VAC±10%, 50 Hz (Opt.)
Other Options
Serial
Communications Interface
Popular Parallel
Computer Interfaces
Ribbons
The printer uses a I-inch nylon ribbon mounted on 3-inch diameter
spools.
The following four colors are available:
REV. J
Black -Part No. 63002293-5001
Red -Part No. 63002293-5002
Green -Part No. 63002293-5003
Blue -Part No. 63002293-5004
1-6

Ribbons (cont'd)
Note
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.
Centronics reserves the right to void the
warranty with regard to any parts damaged
through the use of non-qualified ribbons.
Paper
The printer uses continuous form paper with standard feed holes on
each edge. Paper widths from 4 to 14-7/8 inches 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: 15 to·12 lb
Multiple-Part Forms: Original - 12 to 15 lb
Copies -9 to 12 lb, last copy 15 lb
(Maximum of five parts)
Carbon Paper: 7~ lb with medium hardness
1.5
PHYSICAL DESCRIPTION
The printer is approximately 11~" high by 20" deep by 27-3/4/1
wide, and weighs approximately 118 pounds.
Figures 1-6 to 1-9 show various photographic views of the
printer taken with the covers removed. All major assemblies and components
are identified in the table below the photo.
1-7
REV. J

1. Print Head Assembly
2. Carriage .
3. Form Feed Mechanism
4. VFU Tape Reader
5. Pin Feed Mechanism
6. Ribbon Feed Mechanism
7. Spring Drum
8. Platen Knob
9. Damper
10. Timing Fence
11. Main Drive Belt
Figure 1-6. LEFT FRONT VIEW OF 101A PRINTER
1. Operator Control Panel
2. Form Feed Motor
5. Ribbon Cable
6. Power Driver Board 9. Main Pulley &
Drive Belt
10. Reverse Clutch
3. Video Amplifier & Cable Ass'y
4. Optic Block
7. Penetration Control Knob
8. Forward Clutch
11. Cooling Ran
12.
Ribbon Feed Mechanism
13. Line Feed Switch
Figure 1-7. RIGHT FRONT VIEW OF 101A PRINTER
REV. J .
1-8

3
I,'.
/;
. ,
i. '~~I
1. Electronics Cavity
2. Electronic Card 1
3. Electronic Card 2
4. +5VDC Power Supply
5. +12VDC Power Supply
6. +30 Volt Power Supply
7. Input Connector
8. Speaker
9. AC Power Input
10. Fuses
11. In-Line Fuse
Figure 1-8. REAR VIEW OF 101A PRINTER
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
Figure 1-9. REAR VIEW (101A ELECTRONICS CAVITY REMOVED)
1-9/1-10
REV. J