Atari 1027 Service Manual
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Atari 1027 Service Manual

Atari 1027 Service Manual

Printer field
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Atari 1027 Printer
5-i
Field Service Manual

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Summary of Contents for Atari 1027

  • Page 1 Atari 1027 Printer Field Service Manual...
  • Page 2 ATARI 1027 PRINTER FIELD SERVICE MANUAL Atari 1027 Printer Field Service Manual...
  • Page 3 Atari believes that the information described in this manual is accurate and reliable, and much care has been taken in its preparation. However, no responsibility, financial or otherwise, shall be accepted for any consequences arising out of the use of this material. Information contained herein is subject to change.

  • Page 4: Table Of Contents

    Power-on Reset Circuit 1-10 Oscillator Circuit 1-10 TESTING Equipment Required Diagnostic Procedure Setting up the 1027 for testing and using CPS Diagnostic Diskette with the file T1027.BAS Test for Character Skew DISASSEMBLY/ASSEMBLY SYMPTOM CHECKLIST DRAWINGS AND PARTS LIST SERVICE BULLETINS...
  • Page 5 LIST OF ILLUSTRATIONS Figure Title Page 1027 Printer Block Diagram 1027 Printer Controls/Indicators 1027 Printer Back View 1027 Printer Final Assembly 1027 Printer Mechanical Assembly Power Supply Circuit All Function Test Printout Standard Character Set International Character Set Standard Character Set With Underline...

  • Page 6: Introduction

    1027 Printer. This Field Service Manual is organized in six sections: • THEORY OF OPERATION - Overview of how the 1027 Printer works and what its basic assemblies look like. • TESTING - Review of tests available for diagnosing 1027 Printer problems.
  • Page 7 Atari 1027 Printer Field Service Manual...

  • Page 8: Theory Of Operation

    All firmware is resident in the printer and executed by an onboard microprocessor which controls the functions of the printer. Figure 1-1 on next page show a block diagram of the functional flow of the 1027. Atari 1027 Printer Field Service Manual...

  • Page 9: Printer Block Diagram

    Sensor Circuit Position Sensor Wheel Home Wheel Home Position Position Sensor Sensor Circuit Wheel Timing Wheel Timing Signal Circuit Zero Timing Zero Timing Signal Circuit Voltage Regulator Adaptor Figure 1-1. 1027 Printer Block Diagram Atari 1027 Printer Field Service Manual...

  • Page 10: User Interface

    USER INTERFACE Figure 1-2 shows the location of the Controls/Indicators. Figure 1-2. 1027 Printer Controls/Indicators The Controls/Indicators and their functions are: Access Door - Allows access to the plastic gears for lubrication. Paper Lock/Release Lever - When this lever is moved back (direction of arrow) the paper chute opens to allow insertion of paper.

  • Page 11: Mechanical

    Figure 1-3. 1027 Printer Back View Mechanical This section describes the mechanical characteristics of the 1027 Printer. For an overall understanding of the 1027 printer. operation, read both this section and the Electronic Section which follows the mechanical. Use Figure 1-4 and Figure 1-5 as reference for the following discussion.

  • Page 12: Printer Final Assembly

    Figure 1-4. 1027 Printer Final Assembly Atari 1027 Printer Field Service Manual...

  • Page 13: Printer Mechanical Assembly

    Figure 1-5. 1027 Printer Mechanical Assembly Atari 1027 Printer Field Service Manual...

  • Page 14: Type Selection

    Type Wheel Home Position Sensing The home position of the type wheel is detected by the photosensor (sensor (A) unit)* through the sensor plate assembly mounted on the type wheel. *Sensor (A) contains more than one photosensor. Atari 1027 Printer Field Service Manual...

  • Page 15: Hammer Home Position Sensing

    When this lever is moved forward, the friction roller presses against the platen and paper is fed. ELECTRONIC The 1027 Printer electronics consists of 10 elements which are discussed in the following paragraphs: • the Power Supply Circuit • the Microprocessor 8049 (MPU) •...

  • Page 16: Microprocessor 8049 (Mpu)

    Clock pulses to the motor are approximately 5 msec. Hammer Select Solenoid Drive Circuit Solenoid B, the hammer select solenoid, is controlled by a single pulse input of approximately 10 msec from P21 (pin 22) of the MPU. Atari 1027 Printer Field Service Manual...

  • Page 17: Character Select Solenoid Drive Circuit

    After approximately 100msec. the RST terminal goes High. Oscillator Circuit The MPU uses an external quartz oscillator which determines the operation frequency. The oscillation frequency is 6 MHz ± 0.3%. Atari 1027 Printer 4-10 Field Service Manual...

  • Page 18: Testing

    DO NOT USE LABELS OR ANY ADHESIVE - BACKED MATERIAL. NEVER PRINT WITHOUT PAPER IN THE PRINTER. The following pages explain how to set up the 1027 for testing and contain procedures and sample printouts for each test. Setting up the 1027 for testing and using CPS Diagnostic Diskette with the file T1027.BAS.
  • Page 19 Q) STOP TEST AND RETURN TO MENU PLEASE SELECT AN OPTION Select 1) for the printout illustrated in Figure 2-1. This test runs continuously until Q is pressed to stop the test and return to the menu. Atari 1027 Printer Field Service Manual...

  • Page 20: All Function Test Printout

    1027 PRINTER FUNCTION TEST, PASS # 1 STANDARD CHAR SET !”#$%&’()*+-0123456789:;,=.?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_'abcdefghijklmno pqrstuvwxyz INTERNATIONAL CHAR SET áùÑÉçôí₤ïüäÖúÜâûîéèñêåàÅ↑↓←→ ! ”#$%&’()*+-0123456789:;,=.?@ABCDEFGHIJKLMNOPQR STUVWXYZ[\]^_'abcdefghijklmnopqrstuvwxyzÄ STANDARD CHAR SET WITH UNDER-LINE !”#$%&’()*+-0123456789:;,=.?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_'abcdefghijklmno pqrstuvwxyz DIRECTION PRINT CHECK 00000000011111111112222222222333333333344444444445555555555666666666677777777778 12345678901234567890123456789012345678901234567890123456789012345678901234567890 END OF TEST Figure 2-1. All Function Test Printout Select 2) to print the standard character set.

  • Page 21: Standard Character Set With Underline

    This allows for the scoping . of the wheel select pulse motor. Press Q to stop this test and return to the menu. Atari 1027 Printer 2-4 Field Service Manual Select 8) to continuously print any selected character for as many lines as desired.

  • Page 22: Test For Character Skew

    If the letters are still not correctly aligned, swap the mechanism. Include the test printout with the returned mechanism. Figure 2-6 shows a printout of this test which indicates that the mechanism needs to be swapped. Atari 1027 Printer Field Service Manual...

  • Page 23: Character Skew Printout

    Figure 2-6. Character Skew Printout. (with vertical lines drawn) Atari 1027 Printer Field Service Manual...

  • Page 24: Disassembly/Assembly

    Equipment Required: • A precision screwdriver set Preventive Maintenance Each Atari 1027 Printer which is disassembled must have the following Preventive Maintenance performed: • Carefully clean any dust or dirt from inside the unit - use a dry, soft cloth.
  • Page 25 Insert and tighten the four screws holding the lower case • in place. Insert and tighten the three screws holding the bezel to • the lower case. Insert and tighten the screw located between the • Input/Output (I/O) ports. Replace the cover. • Atari 1027 Printer Field Service Manual...

  • Page 26: Symptom Checklist

    If none, troubleshoot and repair. Solenoid lead wire is Repair if possible. Is cut. there current to the Solenoid (See Pg 4-3)? If yes, replace printer mechanism. If none, troubleshoot and repair. Atari 1027 Printer Field Service Manual...
  • Page 27 Lever. MISPRINTING The preceding character The electrolytic Solder the lead wire. on the same character capacitor lead wire of ring is printed. the DC motor is disconnected from the motor terminal. Atari 1027 Printer Field Service Manual...

  • Page 28: Diagnostic Table

    ZT (Zero Timing Sensor) Connector 2 Pin 2 Use Options #1, #2 and #3 HHP (Hammer Home Position) Use Option #6 Connector 2 Pin 9 WHP (Wheel Home Position Use Option #6 Connector 2 Pin 6 Atari 1027 Printer Field Service Manual...

  • Page 29: Drawings And Parts List

    DRAWINGS AND PARTS LIST Attached to the front cover are representative silkscreens and schematics for the 1027 Printer. Remove them and place them in this section. Minor variations in design may be encountered depending on the production date of the unit, but these schematics provide all details required for an in-depth understanding of all 1027 Printer units.

  • Page 30: Printer Schematic

    Figure 5-1. 1027 Printer Schematic Atari 1027 Printer Field Service Manual...

  • Page 31: Printer Silkscreen

    Figure 5-2. Printer Silkscreen Atari 1027 Printer Field Service Manual...

  • Page 32: Printer Final Assembly

    Figure 5-3 1027 Printer Final Assembly Atari 1027 Printer Field Service Manual...
  • Page 33 This page intentionally left blank. Atari 1027 Printer Field Service Manual...

  • Page 34: Printer Mechanical Assembly

    Figure 5-4. 1027 Printer Mechanical Assembly This page intentionally left blank. Atari 1027 Printer Field Service Manual...

  • Page 35: Service Bulletins

    The following are brief descriptions of each classification: FIELD CHANGE ORDER A Field Change Order describes mandatory hardware or software changes to ATARI products and instructs how to implement these changes. The changes must be performed on all units serviced or repaired.

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