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Atari Stacy Schematics and Drawing Package

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The Atari Stacy schematics and drawing package is a set of Atari Corporation engineering drawings for the Atari Stacy, which the drawings call the LST. The drawings are dated between December 1988 and February 1990. The hosted file has 49 PDF pages. Most of the large drawing sheets were scanned in two halves, so one sheet usually occupies two consecutive PDF pages. There is no text layer.

Contents

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PDF pages Drawing What it shows
1–2 C103641 Approved-vendor and package drawing for the 1M × 1 CMOS DRAM in a ZIP package
3–4 CA200470-XXX Rev B, Assy Drive LST Exploded drive mounting assemblies
5 CA200528-XXX Rev B, Assy Sub PCB LST-4, sheet 6 of 6 Sub-board assembly drawing
6–9 CA200528-XXX Rev B, sheets 5 to 2 of 6 Bill of material for the 4 MB sub board: 32 DRAMs at U5–U36, HD6301V1 keyboard processor at U1, TOS 1.4 EPROMs at U3 and U4 for each country version, C7 1000 µF 16 V, sockets and connectors
10–12 CA200478-XXX Rev B, Assy LED PCB LST, sheets 4 to 2 of 5 Bill of material for the lid board: LM386 audio amplifier, LM337LZ regulator, PC817 optocoupler, the three knobs (VR1 10 kΩ, VR2 3 kΩ with switch, VR3 500 Ω), LEDs, capacitors C1–C6
13–19 CA200464-XXX Rev A, Assy PCB LST, sheets 8 to 2 of 9 Bill of material for the main board: capacitors (sheet 2), resistors (3 and 4), diodes, crystals and the CPU and custom chips (5), logic, RP5C15 clock and Shadow LCD controller (6), connectors (7), sockets and the 3 V 560 mAh lithium clock battery at LB (8)
20–27 C103419 Rev 1, Schematic Diagram Stacy, sheets 1–4 Main-board schematic
28–31 C103639 Rev B, Schematic Diagram Sub PCB LST-4 Sub-board schematic
32–33 C101780-XXX Rev B, DC-DC Converter, sheet 7 of 7 Converter outline
34–35 C103421 Rev A, PCB LST, sheet 2 of 8 Main-board PCB drawing
36–37 C103640 Rev A, PCB Sub PCB LST-4, sheet 2 of 8 Sub-board PCB drawing
38–41 CA200532-XXX Rev D, Assy Main LST-4, sheets 7 and 8 of 8 Exploded views of the machine
42–43 C103509 Rev A, Schematic Diagram LED PCB Lid-board schematic
44–45 CA200478-XXX Rev B, sheet 5 of 5 Lid-board assembly drawing
46–47 C101780-XXX Rev B, DC-DC Converter, sheet 6 of 7 (28 February 1990) Converter schematic: DC input 11–18 V, C101 1000 µF 25 V, the output list with load ranges, and the 85 V, 590 Hz electroluminescent backlight output
48–49 CA200475-XXX Rev C, Assy LCD Panel LST, sheet 4 of 4 LCD panel assembly

The main-board bill of material lists nine electrolytic capacitors, all rated 16 V: C3 10 µF, C14 and C15 47 µF, C17 and C29 100 µF, C31 100 µF, C56 10 µF, C60 220 µF and C61 2200 µF. Its 41 0.1 µF ceramic decoupling capacitors are listed on the same sheet.

What it does not contain

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  • No service text: no theory of operation, test procedures, symptom charts or disassembly instructions.
  • Sheet 1 of each bill of material, and sheet 9 of the main-board list, are not in the scan.
  • Only the 4 MB (LST-4) sub board is covered. The sub boards of 1 MB and 2 MB machines are not.
  • The DC-DC converter appears as Atari drawing C101780 (schematic and outline) with no parts list, so its capacitors are known only from the values printed on the schematic.
  • Nothing on the mains adaptor.

What it settles

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  • The Stacy's clock cell is a 3 V 560 mAh lithium primary cell (C103655-001) at location LB, not a NiCd pack.
  • The backlight is electroluminescent, driven at 85 V, 590 Hz by the DC-DC converter.
  • The converter's specified input range is 11–18 V DC.
  • The custom chips on the main board are socketed (GLUE and MMU in 68-pin PLCC sockets, Shifter and DMA in 40-pin sockets, the Shadow LCD controller in an 84-pin PLCC socket); the DRAMs on the 4 MB sub board are not.

Pages that cite this document

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Download: Atari Stacy Schematics and Drawing Package.pdf (47 MB)

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