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-
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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