Atari SM124 Documentation
Atari documentation for the Atari SM124 monochrome monitor: the service manuals for the two GoldStar chassis, MT-9 and MT-21, and the 1985 owner's manual. Atari's May 1986 summary specification for its ST monitors, which has an SM124 column, is described on Atari SC1224 Documentation.
SM124 Service Manual, chassis MT-9
[edit | edit source]Atari's SM124 High-Resolution Monochrome Monitor Service Manual for chassis MT-9, part number 483-303A, printed in Korea and undated. The hosted scan has 30 pages, and its PDF page numbers match the printed page numbers.[1]
Contents
[edit | edit source]| Page | Contents |
|---|---|
| 1 | Cover and contents |
| 2 | Safety precautions: maximum high voltage 12 kV +1 −2 kV, discharge method, safety inspection and leakage checks |
| 3 | Specifications; adjustment and maintenance (circuit protection, centring, focus, brightness, vertical and horizontal size and linearity) |
| 4 | Geometry measurements (pincushion, trapezium, parallelogram, yoke tilt) |
| 5 to 7 | Theory of operation: video amplifier (Fig. 3), vertical deflection with the TDA1170D block diagram (Fig. 4), horizontal deflection (Fig. 5), power supply |
| 8 | Block diagram |
| 9 | Timing chart |
| 10 | Transistor and IC basing |
| 11 and 12 | Voltage charts: transistors, then the TDA1170D and AN5265 pin voltages |
| 13 to 15 | Board layouts: main board component and solder sides, power supply board |
| 16 to 19 | Troubleshooting charts: main, power, video, sound |
| 20 to 25 | Circuit waveforms: video, vertical and horizontal deflection |
| 26 to 28 | Replacement parts list |
| 29 | Exploded view and mechanical parts |
| 30 | Schematic diagram, P/N 484-476A |
What this manual does not contain
[edit | edit source]- A procedure for opening the case.
- Any coverage of the MT-21 chassis.
- Agreement on every designator: the adjustment text names VR301 as the sub-brightness control, where the board legend and the video chart give VR702, and Q303 is a KTC2229 in the voltage chart and a KTC2249 in the parts list.[1]
An older scan of the same manual on the Internet Archive (item SM124_Service_Manual_MT-9) has ten pages replaced by "missing page" placeholders; the hosted copy is a later, complete scan. Four pages of this manual (the exploded view, the schematic, the geometry page and the specification page) are also bound into the SC1224 CA-3 scan, File:Atari SC1224 Service Manual (CA-3 chassis).pdf, at PDF pages 2 to 5.[2]
Pages that cite this document
[edit | edit source]- Atari SM124: specifications and hardware
- Atari SM124 General Maintenance: safety, fuses, adjustments and the safety inspection
- Atari SM124 Troubleshooting Guide: the charts and the voltage chart
- Atari SM124 Capacitor Replacement Guide: the MT-9 capacitor list
Download: Atari SM124 Service Manual (MT-9 chassis).pdf
SM124 Service Manual, chassis MT-21
[edit | edit source]Atari's service manual for the SM124 on chassis MT-21, part number 483-351A, printed in Korea and undated. The scan has 27 pages and carries the stamp of Schaltungsdienst Lange, a Berlin schematic service, on the cover. PDF pages 1 to 22 are the manual itself, with printed page numbers matching the PDF; pages 23 to 27 are separate sheets.[3]
Contents
[edit | edit source]| Page | Contents |
|---|---|
| 1 | Cover and contents |
| 2 | Safety precautions and safety inspection |
| 3 | Specifications; adjustment and maintenance, including the B+ adjustment VR901 (27 V) |
| 4 | Geometry measurements |
| 5 to 8 | Theory of operation: video amplifier, vertical deflection (TDA1170D), horizontal deflection (AN5790N, Fig. 5), power supply with the TDA4601 block diagram, pin functions and Fig. 7, Power Circuit |
| 9 to 11 | Block diagram, timing chart, transistor and IC basing |
| 12 and 13 | Voltage charts |
| 14 and 15 | Main board layout, component and solder sides |
| 16 to 19 | Troubleshooting charts: main, power, video, sound |
| 20 to 22 | Replacement parts list |
| 23 | "Revised video circuit SM124 monitor", with an annotated photograph of the board |
| 24 to 27 | MT-21 schematic diagrams and the exploded view |
What this manual does not contain
[edit | edit source]- Clean values throughout. The scan is a photocopy, and some parts list entries disagree with the power circuit drawing (C909) or with the part number they carry (C305). See Atari SM124 Capacitor Replacement Guide.[3]
- Any coverage of the MT-9.
Pages that cite this document
[edit | edit source]- Atari SM124: hardware
- Atari SM124 General Maintenance: fuse, adjustments
- Atari SM124 Troubleshooting Guide: the charts and the voltage chart
- Atari SM124 Capacitor Replacement Guide: the MT-21 capacitor list and power circuit
Download: Atari SM124 Service Manual (MT-21 chassis).pdf
SM124 owner's manual
[edit | edit source]Atari's SM124 High-Resolution Monochrome Monitor Owner's Manual, copyright 1985, printed in Korea, 10 scanned pages. It covers unpacking, connecting the monitor to an ST, the on/volume, contrast and brightness controls, a short troubleshooting table, care and safety, customer support and specifications (220 V 50 Hz, 50 W, 17 lb).[4]
Download: Atari SM124 Owner's Manual (1985).pdf
Other documents not hosted here
[edit | edit source]The Atari Document Archive (dev-docs.org) lists the same three documents, and the Internet Archive holds a 13-page "Atari SM124 Schematic (1986)" set and a redrawn MT-21 schematic by Remon Pel.[5][6]
References
[edit | edit source]- ↑ 1.0 1.1 Atari, SM124 High-Resolution Monochrome Monitor Service Manual, chassis MT-9, P/N 483-303A. File:Atari SM124 Service Manual (MT-9 chassis).pdf; source Internet Archive item sm-124-service-manual-mt-9.
- ↑ Atari SC1224 Documentation, CA-3 service manual page map.
- ↑ 3.0 3.1 Atari, SM124 High-Resolution Monochrome Monitor Service Manual, chassis MT-21, P/N 483-351A. File:Atari SM124 Service Manual (MT-21 chassis).pdf; source Internet Archive item SM124_Service_Manual_MT-21.
- ↑ Atari Corp., SM124 High-Resolution Monochrome Monitor Owner's Manual, 1985. File:Atari SM124 Owner's Manual (1985).pdf; source Internet Archive item Atari_SM124_Owners_Manual_1985.
- ↑ "Atari SM124 Schematic (1986)(Atari)", Internet Archive item Atari_SM124_Schematic_1986_Atari, https://archive.org/details/Atari_SM124_Schematic_1986_Atari.
- ↑ "Atari SM 124 Schematic 1986 Atari (MT-21)", a reworked schematic of the MT-21 board, Internet Archive item atari-sm-124-schematic-1986-atari, https://archive.org/details/atari-sm-124-schematic-1986-atari.