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306
Technical manual
Centronics 306 Technical Manual
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Technical manual
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
Section Page
Model 306 Printer (Top and VFU Covers Removed)
Printing the Letter (H)
Paper Movement Mechanism
Right Front View of
Rear View of
Printer Dimensions
Initializing the Printer
Character Printing
Prime Timing
Input Data Timing - no Busy Condition
Input Data Timing - Causing Busy Condition
4.6.2 Character Registration and Timing
Initiating the Printer Operation
4.6.4 Print Head Operation
4.6.5 Power Driver Circuits
Character Generator (ROM)
Forward Clutch Interconnection Diagram
Character Timing
4.6.4 Print Head Operation
Power Driver Circuits
Print Head Timing
Paper Movement
4.7.1 Line Feed
Line Feed Timing
4.7.3 Vertical Tab
Vertical Format Unit (Optional)
Line Feed Solenoid Driver
Special Functions
Bell (Optional)
Motor Control (Optional)
Motor Control Timing
4.9 Power Supplies
And -12V Regulators
Power Supply (Unregulated)
Outputs from Lsi Chips (Me25 and Me16)
4.10.1 Lsi Chip Me25
4.10.2 Lsi Chip Me16
Introduction
Mechanical Assemblies
Carriage Mechanism
Carriage Movement Adjustments
PLATEN {Figure AB
PAPER PAN (Figure AC)
Driving Mechanism
Adjustment of Timing Belt (AD-15) (View from Back of Printer, Forward)
Forward Clutch Adjustment (Air-Gap)
Bushing End-Play Adjustment for (Forward Clutch Shaft Air-Gap and Preload Clutch)
Idler Pulley Assembly (Figure AF)
Adjustments
Reed Switch (AG)
Reed Switch Assembly, Left (AG)
Left Reed Switch (AG-1) Static-Adjustment
PRINTER BASE {Figure AH
Frame (Figure AI)
Paper Feed (Figure AJ)
Pin Feed Unit (Figure AK)
Frame - AI
Ribbon Feed (Figure AL)
Locating Idler Pulley Assembly
Locating Dimension for Ribbon Feed Rack
Rack and Pinion Adjustment, Ribbon Mechanism
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
Cover (Figure AM)
Operator Panel (Figure AN)
Electrical Components (Figure AO)
Electrical Components (Figure AP)
Electrical Components (Figure AQ)
Print Head and Associated Assemblies
Fibre Optics Head, Adjustment from Optic Fence
Fibre Optics Head Alinement and Flexible Timing Fence
Motor Control Location and Installation
Vertical Format Unit (VFU) - Option
Removal/Replacement of Drive Shaft 63060142-5001 and Couplings 63060144-2002 for VFU Assembly
Printer Drive Mechanism, Model
Paper Tape Reader Adjustment
Printer Drive Mechanism, Model
Section Maintenance
Preventive Maintenance
Troubleshooting Guide
Schematic Diagram, Logic/P.s. Board (+5V) (Sheet 2 of 4)
Schematic Diagram, Logic/P.s. Board (+5V) (Sheet 4 of 4)
Schematic Diagram, Power Driver Board (Sheet 1 of 2)
Schematic Diagram, Power Driver Board (Sheet 2 of 2)
Schematic Diagram, Video Amplifier
Interconnection Diagram, Connector Card
Wiring Diagram, Printer Mechanism
Schematic Diagram, Elapsed Time Indicator (Option)
PC Board Ass'y, Logic/Power Supply Board (Sheet 1 of 2)
PC Board Ass'y, Logic/Power Supply Board (Sheet 2 of 2)
PC Board Ass'y, Video Amplifier and Cable Ass'y
PC Board Ass'y, Connector Card
PC Board Ass'y, Elapsed Time Indicator (Option)
Cable Ass'y, Computer Input
Cable Ass'y, Data Input
Platen - AB
Driving Mechanism
Pin Feed - AK
Cover - am
Carriage - AA
Paper Pan - AC
Driving Mechanism
Idler Pulley - AF
Reed Switch - AG
Base - AH
Paper Feed - AJ
Ribbon Feed - al
Operator Panel - an
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
Tape Reader Assembly 68060125-5003 (Option)
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MODEL
MARCH 1976
Centronics
No.
37400040
-
Rev F
306
·
PRINTER
l:EnTRDnll:S
data computer corp.
HUDSON, NEW
HAMPSHIRE,
03051
TELEPHONE (603) 883 - 0·111
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