Tandy 1000 RLX Capacitor Replacement Guide
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Capacitor work on the Tandy 1000 RLX and RLX/HD follows the procedure on Tandy 1000 RL Capacitor Replacement Guide: check the main board's surface-mount tantalums for shorts and the fanless supply for failed electrolytics. Tandy's 1995 parts lists give the RLX and RLX/HD the same power conversion parts as the RL, including the 150 µF 200 V capacitor C7, so the RL guide's supply section applies.[1][2][3] Catalogue numbers 25-1452 and 25-1453 are the RLX and RLX/HD.[4]
 | The supply runs from the mains, and its capacitors can hold a charge after the machine is unplugged. Unplug the computer and let it stand before working on the supply. |
Values from the parts lists
[edit | edit source]The lists merge every assembly into one, so a reference may belong to the main board, the supply or a drive. Check each value against the part before ordering.[1]
| Reference | Value |
|---|---|
| C7 | 150 µF 200 V |
| C1 | 22 µF 10 V |
| C2, C3 | 10 µF 16 V |
| C39 | 0.33 µF 50 V |
| Value | RLX (25-1452) | RLX/HD (25-1453) |
|---|---|---|
| 10 µF 16 V | C86, C173, C174, C177, C181 | C86, C87, C95, C173, C174, C177, C181 |
| 22 µF 16 V | C4, C12, C13, C29, C54, C76, C81, C91, C104, C110, C112, C114 | Same as RLX |
| 3.3 µF 16 V | C49 | C49 |
Sources: Tandy bills of materials 250-1452 and 250-1453.[1][2] Both lists also give C20 to C23 (0.022 µF 50 V) the type code ALP, but with a ceramic-style part number; check those on the board. On the RL, a type TNP part, C98, was identified as a tantalum after it shorted and burnt; see the RL guide for the symptoms and the test.[5]
Power supply
[edit | edit source]The RLX supply is rated at 25 W and has no fan.[4] An RLX/HD owner reads the label inside his supply as -12 V at 0.11 A on pin 1, +12 V at 0.6 A on pin 2, 0 V on pins 3 and 4, and +5 V at 3.3 A on pins 5 and 6.[6] Plasma notes that the -12 V rail is probably used only by the serial port.[6] The steps for replacing the supply's capacitors are on Tandy 1000 RL Capacitor Replacement Guide.
Clock battery
[edit | edit source]The RLX parts list includes a 3 V CR2032 cell and holder for the DS1215 clock. It is a battery, not a capacitor, but check it for leakage while the board is out.[1]
Related pages
[edit | edit source]- Tandy 1000 RLX
- Tandy 1000 RLX General Maintenance
- Tandy 1000 RLX Troubleshooting Guide
- Tandy 1000 RL Capacitor Replacement Guide
References
[edit | edit source]- ↑ 1.0 1.1 1.2 1.3 Tandy National Parts, bill of materials 250-1452 "Tandy 1000 RL-286", January 1995, 25-1452.txt, TVDog's Tandy 1000 archive (retrieved 2026-10-21).
- ↑ 2.0 2.1 Tandy National Parts, bill of materials 250-1453 "Tandy 1000 RL/286 HD", January 1995, 25-1453.txt, TVDog's Tandy 1000 archive (retrieved 2026-10-21).
- ↑ Tandy National Parts, bill of materials 250-1450 "Tandy 1000 R L", January 1995, 25-1450.txt, TVDog's Tandy 1000 archive (retrieved 2026-10-21).
- ↑ 4.0 4.1 Radio Shack, computer catalogue RSC-23 (1992), p. 8, "Home office and family PCs", page scan at RadioShackCatalogs.com (retrieved 2026-10-22).
- ↑ "Tandy 1000 RL tone of death", Vintage Computer Federation forum, February 2021, thread. Posts by falter, daver2 and keenerb, 14-20 February 2021.
- ↑ 6.0 6.1 "Tandy 1000 RLX/HD power supply replacement (6-pin connector type, wiring gauge, etc)", Vintage Computer Federation forum, July 2026, thread. Posts by TandyDean and Plasma, 18 July 2026.
