Panasonic FS-A1WSX Capacitor Replacement Guide
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No parts list or circuit diagram for the Panasonic FS-A1WSX has been found, so there is no published list of its electrolytic capacitors. The nearest is BABAX's parts list for the Panasonic FS-A1WX, which gives 30 electrolytics on the WX main board; it is tabulated in the Panasonic FS-A1WX Capacitor Replacement Guide.[1]
How far the WX list applies
[edit | edit source]- The WSX transformer carries the same part number as the WX's, DDT5U7J02Z-W, and has a four-pin connector like the WX's.[2][3] That suggests a similar supply, but no source confirms that the WSX's supply components or their positions match.
- The WSX adds an S-video output and moves the cassette interface into the RGB connector, so its board differs from the WX's at least in those circuits.[4]
- The PDF of BABAX's WX drawing has the internal title "FS-A1WX,FX.WSX_SCHEMATIC_04.CE3", but the drawing and parts list are of a WX board.[3]
Read the value, voltage and temperature rating off each capacitor on your own board before ordering, and use the WX list only to check what you read.
WX supply capacitors for comparison
[edit | edit source]| WX position | Value | Voltage | Rating | Function on the WX |
|---|---|---|---|---|
| C57, C34 | 3300 µF | 25 V | 85 °C | Reservoirs for the +5 V converter |
| C53 | 3300 µF | 10 V | 105 °C | +5 V converter output |
| C70 | 470 µF | 6.3 V | 85 °C | +5 V line |
| C36, C35 | 470 µF | 35 V | 85 °C | ±12 V regulator inputs |
| C55 | 1 µF | 50 V | 85 °C | −12 V output |
References
[edit | edit source]- ↑ 1.0 1.1 BABAX, FS-A1WX parts list, revision 02, 5 August 2014, capacitors: C2, C18, C25, C26, C27, C41, C63, C70, C71, C84, C98 470 µF 6.3 V 85 °C; C12, C28, C55, C64 1 µF 50 V 85 °C; C13, C20 22 µF 50 V 85 °C; C14 10 µF 50 V 85 °C; C34, C57 3300 µF 25 V 85 °C; C35, C36 470 µF 35 V 85 °C; C42, C43, C45, C46, C85 2.2 µF 50 V 85 °C; C52 100 µF 6.3 V 85 °C; C53 3300 µF 10 V 105 °C; C58 1000 µF 6.3 V 85 °C. Hosted as File:Panasonic FS-A1WX schematic and parts list (BABAX, Rev 04a).pdf.
- ↑ Help with the FS A1WSX internal transformer, July 2004—link(accessed 2026-10-21) Niles: the WSX's internal transformer had failed; it is marked "DDT5U7J02Z-W", and its connector to the main board has four pins. NYYRIKKI: probably the same transformer as in the A1WX (round, about 11 W, he thought); he had his rewound for 220 V by a local repair shop and later used it in an A1ST, which originally has a different transformer and connector; the usual problems of the Panasonic FS series are the drive belt, the power supply and a worn keyboard membrane. Sonic_aka_T: his FS-A1GT's three-pin CN1 measured 19.2 V AC from pin 1 to each of pins 2 and 3, off load, on 120 V mains.
- ↑ 3.0 3.1 BABAX, Panasonic MSX2+ FS-A1WX Schematic, revision 04a, 9 August 2014, traced from a board marked DFUP0250ZAU1a (serial 8KCKB01501), with parts list "FS-A1WX パーツリスト PARTS LIST", 5 August 2014, revision 02. Parts list: IC1 CXA1145M; IC2 TC8566AF; IC3 M60014-0140FP (the drawing labels it "FX/WX gate array"); IC4 T9769A or B; IC5 YM2413; IC6 LM324; IC7 MC34063; IC10 MN1280R; IC11 to IC14, IC22 and IC23 MB81464-12; IC17 and IC18 MB834000; IC19 and IC20 MB8464-15L; IC21 and IC24 81C4256 shown in brackets as unfitted; IC28 79L12; IC29 78L12; Q11 2SA1598; D8 SB540; X1 16.00 MHz; X2 32.768 kHz; X4 21.47727 MHz; T1 transformer DDT5U7J02Z-W; V1 battery 1.5 V × 2; RY1 relay SZ-5; CN1 power in, CN6 RGB (8-pin DIN), CN7 cassette (8-pin DIN), CN13 drive. The drawing labels IC8 V9958 "MSX-VIDEO II"; the parts list gives "V9938 E-VDP-II". The list notes that ROMs and transistors can differ between production lots. Community reverse-engineered drawing, not a Panasonic document. Hosted as File:Panasonic FS-A1WX schematic and parts list (BABAX, Rev 04a).pdf.
- ↑ Panasonic FS-A1WSX, MSX Resource Center wiki, 14 August 2026—link(accessed 2026-10-21) Community page: released October 1989 in Japan at ¥69,800 as the successor of the FS-A1WX; the cassette port is combined with the RGB connector (loading and saving work with a special cable, at a much lower volume than a normal tape interface); S-video output added; colour printing with the Panasonic FS-PC1 printer; 64 KB RAM in slot 3-0 and 16 KB SRAM; 128 KB VRAM; Yamaha V9958; PSG and MSX-MUSIC; Toshiba T9769 model B or C and a Mitsubishi gate array given as M50014; firmware bypassed only with the front switch, not the DEL key; RAM can be raised to 256 KB with a little soldering and to 512 KB with a more complicated modification; drive belt rubber, 0.3 mm thick, 58 mm diameter, 3 mm wide, sold as Panasonic FW-U1P501J; the gallery shows the EME213MA drive, with the caption that its alignment sensor must be moved during a belt change; connections RF, audio and composite video, RGB output and data recorder port, S-video, printer, two general-purpose ports, two cartridge slots, mains plug for AC 100 V ±10 %, 50/60 Hz; recommended backup batteries lithium or Eneloop, alkaline advised against "because they leak one day or another".
- ↑ FS-A1WX circuit diagram, figure 8, "power unit", printed page 63: AC 100 V through the double-pole power switch to transformer T1; a four-pin connector to the board (pin 2 to ground); D1 and D2 into C57 and C34 (25 V, 3300 µF each); DC/DC converter IC7 (MC34063) with switching transistor Q11 (printed "2SA598"), current-sense resistor R96 (0.2 Ω), R97 and R98 (100 Ω), R113 (22 Ω), R114 (68 Ω), timing capacitor C59 (330 pF), catch diode D8, feedback resistors R99 (3.9 kΩ) and R101 (1 kΩ), C54 (0.1 µF) and R95 (330 Ω), inductor L5 to the +5 V (Vcc2) line with C53 (10 V, 3300 µF), then L6 to +5 V with C70 (6.3 V, 470 µF); pin 4 through D7 and D6 to C36 and C35 (35 V, 470 µF) and the 78L12 (IC29, +12 V, with C56 0.1 µF) and 79L12 (IC28, −12 V, with C55 50 V 1 µF) regulators. Lower half: the clock oscillator (IC9 TC40H004P, X2 32.8 kHz), reset IC10 (MN1280R), the 3 V battery connection through D9 and D10, and the backup switching transistors Q8 and Q9. Hosted as File:Panasonic FS-A1WX circuit diagrams (pages 55 to 64).pdf. Reproduced as File:Panasonic FS-A1WX power supply circuit (figure 8).png.