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Panasonic FS-A1ST Technical Guide

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The Panasonic FS-A1ST Technical Guide is Matsushita Electric Industrial's service document for the Panasonic FS-A1ST, issued in February 1991 and written in Japanese.[1] The hosted copy is the MSX Archive scan made by HansO (Hans Otten) in 2001 from an original supplied by Bas Kornalijnslijper. The guide has 46 pages; the archive's scan has a 47th page, a handwritten covering letter, which is not part of the guide and has been left out. The guide number on the cover is partly cut off in the scan.[2]

Contents

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Page numbers are the printed numbers, which match the PDF pages.

Contents (from page 2)
Pages Contents
1 Cover: features and specification
2 Contents
3, 4 Names of parts; keyboard
5 In-service notes: the built-in software switch, the backup cells, setting the date and time
6 to 8 Word processor
9 Memory and slot map; I/O map
10, 11 Disassembly
12 to 14 Pass/fail checks: supply voltages, clock waveforms, video and audio signals, with BASIC test programs
15, 16 Block diagram
17, 18 Main board, component side
19 to 21 Circuit diagram, main board system section
22 Circuit diagram, main board power section, LED board and switch board
23, 24 Main board, solder side
25 LED board and switch board layouts; keyboard flex pattern
26 Key matrix
27 to 36 IC block diagrams and pin functions
37 to 40 Electrical parts list
41, 42 Construction drawings
43 to 45 Mechanical parts list
46 Packing

[3]

What it settles

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  • The supply design and the expected supply voltages: the circuit diagram on page 22 and the pass/fail figures on page 12, used in the Panasonic FS-A1ST Troubleshooting Guide.[4][5]
  • The order of dismantling and the connectors to unplug (pages 10 and 11).[6]
  • The positions and Panasonic part numbers of all 46 aluminium electrolytics on the main board (pages 39 and 40), tabulated in the Panasonic FS-A1ST Capacitor Replacement Guide.[7]
  • The original values of the audio parts that the FRS modification changes.[8]
  • That the backup cells were not fitted at the factory (page 5).[9]

What it does not contain

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  • No section on the drive's own circuit or parts; the contents list stops at the main board, LED board, switch board and keyboard.[3]
  • No fault-finding chart beyond the pass/fail checks on pages 12 to 14.
  • The parts list gives part numbers and descriptions but not values; the electrolytics' values have to be decoded from the Panasonic part numbers or read from the circuit diagrams.[7]

Pages that cite this document

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References

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  1. ↑ Matsushita Electric Industrial Co., Technical Guide: Personal Computer FS-A1ST, February 1991, cover (printed page 1): features and specification. Features: R800 16-bit CPU, with a Z80-compatible CPU for existing software; word processor with voice guidance; 256 KB main RAM and 128 KB video RAM; MSX-DOS2 as standard; PCM recording and playback. Specification: AC 100 V ±10 %, 50/60 Hz; DC 3 V from two AA dry cells for backup; 21 W; CPU R800 with a Z80A-compatible CPU; ROM 1.5 MB (MSX Kanji BASIC version 4.0 80 KB, MSX Disk BASIC 64 KB, MSX-MUSIC BASIC 16 KB, 16-dot font ROM 256 KB, MSX-JE dictionary ROM 512 KB, word processor ROM 608 KB); RAM 400 KB (main 256 KB, video 128 KB, SRAM 16 KB for backup); display controller V9958; system controller T9769 (MSX-Engine: PSG, RTC, keyboard, printer and general-purpose ports); FM sound YM2413; 92-key keyboard; 3.5-inch double-sided double-density drive, 1 MB unformatted, 720 KB formatted; two cartridge slots, printer port, two general-purpose ports, S-video, composite video, audio, RGB and RF outputs; 425 × 292 × 89 mm; 3.4 kg; standard price ¥87,800 excluding tax. Hosted as File:Panasonic FS-A1ST Technical Guide.pdf.
  2. ↑ File:Panasonic FS-A1ST Technical Guide.pdf, file description: source https://www.msxarchive.nl/pub/msx/docs/service_manuals/panasonicturborstsm.pdf, retrieved 21 October 2026; another copy is at https://archive.org/details/PanasonicFSA1STTechnicalGuide.
  3. ↑ 3.0 3.1 Technical Guide: FS-A1ST, printed page 2, contents. Hosted as File:Panasonic FS-A1ST Technical Guide.pdf.
  4. ↑ Technical Guide: FS-A1ST, printed page 22: circuit diagram of the main board power section, LED board and switch board. AC 100 V through the double-pole power switch to the transformer. The secondary reaches the board at CN1: pin 1 is the centre tap (0 V), pins 2 and 3 the two ends, all through choke block L5. D2 and D3 charge C50 (25 V, 12000 µF), which feeds both the DC/DC converter and the +12 V regulator. DC/DC converter IC14 (MC34063) with Q1 (2SA1598), R36 (0.2 Ω, 1/2 W), R37 (100 Ω, 2 W), D8, L6 (220 µH), C10 (10 V, 4700 µF) and feedback resistors R96 (3.09 kΩ, 1 %) and R182 (1 kΩ, 1 %); L2 (20 µH) to the +5 V line, with zener D9, R217 (1 kΩ) and a thyristor from +5 V to ground. IC11 (C24M12HF) for +12 V with C51 and C42 (16 V, 100 µF) and L9 (220 µH). D4 and D5 charge C59 (35 V, 470 µF) for IC13 (AN7912T), −12 V, with C60 and C41 (16 V, 100 µF) and L10 (220 µH). D7 and D6 from the +12 V and −12 V lines to ground. DC voltages printed on the diagram include Q1 emitter 20.4 V, base 20.3 V, collector 5.2 V; IC14 pins 6 and 7 20.4 V, pin 5 1.2 V; IC11 input 20.5 V. Hosted as File:Panasonic FS-A1ST Technical Guide.pdf. The power section is reproduced as File:Panasonic FS-A1ST power supply circuit (Technical Guide).png.
  5. ↑ Technical Guide: FS-A1ST, printed page 12, pass/fail checks. Power: +5 V from the DC/DC converter, ±12 V from regulators. +5 V at the collector of Q1, 5 V ±0.25 V. +12 V: IC11 input about +21 V, output +12 V ±1.2 V. −12 V: IC13 input about −22 V, output −12 V ±1.2 V. Clock waveforms: CPU clock at IC16 pin 8; VDP clock at IC16 pin 64; RTC clock at IC17 pin 20; FDC clock at the upper terminal of X1; OPLL clock at IC10 pin 8; 16-bit CPU clock at X3 pin 1. Hosted as File:Panasonic FS-A1ST Technical Guide.pdf.
  6. ↑ Technical Guide: FS-A1ST, printed pages 10 and 11, disassembly. Upper cabinet: five screws (A) on the underside, then connectors CN12 and CN14. Keyboard: three screws (B), slide it to the left while lifting, unplug the flexible cables from CN10 and CN11. Keyboard flex pattern: 18 screws on the back of the keyboard; keep dust out. Drive: four screws (C), unplug CN19 and the flat cable from CN13. Main board: with the upper cabinet, keyboard and drive removed, two screws (D) on the underside, two screws (E), five (F) and three (G); unplug CN1 and CN17. LED board: three claws (H). Operation panel: claws (I). Switch board: two screws (J). Hosted as File:Panasonic FS-A1ST Technical Guide.pdf.
  7. ↑ 7.0 7.1 Technical Guide: FS-A1ST, printed pages 39 and 40, electrical parts list, aluminium electrolytic capacitors: C1, C2, C7, C8, C9, C38, C52, C61, C66, C68, C70, C71 ECEA0JU471; C10 ECEA1AU472; C19, C40 ECEA1HN010; C20, C34, C47, C62 ECEA1HU010; C21 ECEA0JU220; C22, C26, C28, C37 ECEA1CU100; C23, C44 ECEA0JU101; C27, C35, C41, C42, C51, C60, C162, C163, C164, C165 ECEA1CU101; C36 ECEA1CU470; C43, C54, C55, C58, C63, C64 ECEA1HU2R2; C50 ECOS1EP123DA (25 V, 12000 µF); C59 ECEA1VU471; C67 ECEA0JU102. Hosted as File:Panasonic FS-A1ST Technical Guide.pdf.
  8. ↑ Technical Guide: FS-A1ST, electrical parts list: C48 and C49 DCUV1H333KBL (33 nF); C57 ECUX1H271KCN (270 pF); C159 ECUX1H471KCN (470 pF); R23 ERJ6GEYJ393 (39 kΩ); R24 ERJ6GEYJ563 (56 kΩ). Hosted as File:Panasonic FS-A1ST Technical Guide.pdf.
  9. ↑ Technical Guide: FS-A1ST, printed page 5, in-service notes: the built-in software switch on the front panel (on, the main menu starts at power-on unless a ROM cartridge is fitted; off, BASIC starts); the backup RAM holds the word processor's learning dictionary and the settings made with BASIC's SET commands, and it and the clock run from two AA dry cells, which are not fitted at the factory; the date and time are set with SET DATE and SET TIME. Hosted as File:Panasonic FS-A1ST Technical Guide.pdf.

Download: Panasonic FS-A1ST Technical Guide.pdf



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