Atari 825 Documentation
The Atari 825 documentation hosted here is Atari's field service manual for the Atari 825 printer and the operator's manual supplied with it.
825 Printer Field Service Manual
[edit | edit source]The 825 Printer Field Service Manual is an Atari service manual marked "Region distribution only". No part number or date is printed in the scan. It covers the Atari 825, which is the Centronics 737, and the updated replacement model, the Centronics 739. The introduction lists the differences between the two logic boards: the 739 board has international character set ROMs and a DIP switch to select them, and inputs for a front panel power LED and a roll paper out switch that are not fitted. With a 737 8049 processor fitted, a 739 board works as a 737. The hosted copy is the Internet Archive's 60-page text-layer PDF.[1]
Contents
[edit | edit source]| Section | Title | Printed pages |
|---|---|---|
| Introduction: 737 and 739 boards | PDF p. 2 | |
| 1 | Description: character sets, paper, controls, power supply outputs | 1 to 3 |
| 2 | Theory of operation: block diagram, data input and print cycles, carriage, line feed and ribbon motor circuits, power supply, flyback protection | 4 to 15 |
| 3 | Maintenance and troubleshooting: cleaning and lubrication, detailed troubleshooting chart (table 3-1) | 16 to 20 |
| 4 | Adjustments: head gap, rotor and Hall effect sensor clearance, print speed | 21 to 24 |
| 5 | Removal and replacement: mechanism, logic board, carriage parts, covers, fuse F1, auto line feed resistor | 25 to 42 |
| 6 | Schematics (figures 6-1 to 6-3c), logic board silkscreen, interconnection diagram (figure 6-5) | 43 to 50 |
| 7 | Recommended spare parts list (table 7-1) and replacement part sources | 51 |
| 8 | Signal waveforms (figure 8-1) | 52 to 53 |
| 9 | Glossary | 54 |
| Field discrepancy notice form | PDF p. 60 |
What this manual does not contain
[edit | edit source]- A component-level parts list. Table 7-1 lists subassemblies, a few chips, the fuses and cables.
- Legible component values. The schematic and silkscreen pages are poor copies, and capacitor values cannot be read from them.
- Voltage tolerances for the supply rails.
- The T825 test program that the waveform section and the speed adjustment refer to, or the self-test set-up it cites from "paragraph 5.5" of the operator's manual.
The speed adjustment in section 4.5 names potentiometer R25 and a column interrupt period of 1.0 to 1.1 ms; figure 8-1 names R59 and 2.0 to 2.1 ms. The main filter capacitor is C3 in the theory section, while the board drawing in figure 4-3 shows a large can marked C14.
Pages that cite this manual
[edit | edit source]- Atari 825: description, hardware, power supply, flyback board, fuse
- Atari 825 Maintenance Guide: cleaning, adjustments, disassembly, fuse
- Atari 825 Troubleshooting: power supply, flyback board, troubleshooting chart, waveforms, spare parts
Download: Atari 825 Printer Field Service Manual.pdf
80-Column Printer Operator's Manual
[edit | edit source]The 80-Column Printer Operator's Manual for the Atari 825 is Atari part number C015506, copyright 1980, with the code TP 114-C 12-80 on its title page. The Internet Archive item describes it as revision 2. The hosted copy is the 58-page text-layer PDF, which also contains a Centronics manual addendum, publication 37407857 Rev. A of 25 August 1980, on the adjustable pin-feed drive roller, and the unpacking and repacking sheet.[2]
Contents
[edit | edit source]| Section | Printed pages |
|---|---|
| 1 Introduction: printer interface, printer features, compatible Atari systems | 1 to 4 |
| 2 Setting up: installation, loading paper | 5 to 12 |
| 3 Operation: start-up, principles of operation, control switches, paper handling, printing, control codes, right margin justification | 13 to 28 |
| 4 Owner maintenance: changing the ribbon, cleaning, inspection and lubrication, replacing the fuse, disabling auto line feed | 29 to 33 |
| 5 Troubleshooting (table 7) | 35 |
| 6 Specifications | 37 to 38 |
| 7 Order numbers | 39 |
| Appendix: printer and screen character output (table A-1), printer interface pin assignments (table A-2) | A-1 to A-6 |
What this manual does not contain
[edit | edit source]- Any adjustment or repair procedure beyond the fuse and the auto line feed resistor.
- A self-test procedure.
Pages that cite this manual
[edit | edit source]- Atari 825: specifications, interface, fuse
- Atari 825 Maintenance Guide: cleaning and lubrication table, ribbon, covers, fuse, auto line feed
- Atari 825 Troubleshooting: owner checks, installation
Download: Atari 825 80-Column Printer Operator's Manual C015506.pdf
References
[edit | edit source]- ↑ Internet Archive item atari-825-printer-field-service-manual, "Atari 825 Printer Field Service Manual". The uploader notes that the drawings and schematics in the scanned original are poor and hard to read.
- ↑ Internet Archive item Atari825PrinterOperatorsManual, "Atari 825 Printer Operator's Manual", C015506 Revision 2.