Sharp X1D Capacitor Replacement Guide
Sharp's capacitor values for the Sharp X1D have not been published. There is no scan of the X1D service manual on the Internet Archive or X1 Center, and the magazine schematics that X1 Center hosts cover the first X1 and the X1turbo, not the X1D.[1] Iwai Ippei's X1DX article in Oh!MZ (December 1985) draws the X1D's cassette control circuit, but not its power supply.[2]
Where to start
[edit | edit source]- The power supply inside the main unit feeds a machine that Sharp rated at 49 W, against 30 W for the X1C announced with it.[3] The supply's electrolytics carry the most stress and are the first to check.
- The board around the NiCd clock cell may already be corroded. Deal with the cell first, as in General Maintenance, so that capacitors next to it are not replaced onto damaged pads.[4]
- For comparison, X1 Center reworked the switching supply of a first-model X1. It replaced all but one of the electrolytics and tested the old ones: only the large primary reservoir had drifted, losing 12 per cent of its capacitance, though X1 Center notes that a capacitor can measure correctly and still leak at full voltage. The primary side of that supply charges to about 144 V DC.[5] Whether the X1D's supply is the same unit has not been recorded.
Making your own list
[edit | edit source]Warning: unplug the X1D and leave it for several minutes before touching the power supply. Its primary capacitor can hold a charge at mains-derived voltage.
- Photograph the power supply board and the main board from above before removing anything.
- Write down, for every electrolytic, its board reference, capacitance, voltage, diameter, height, lead spacing, temperature rating and the side its negative stripe faces.
- Check each for bulging tops, leaked electrolyte or discoloured board, and measure suspect ones out of circuit with an ESR meter. Capacitor Failure Symptoms shows what to look for.
- Order replacements of the same capacitance and the same or higher voltage, rated 105 °C, in the same physical size.
After replacement
[edit | edit source]- Power up with only the keyboard and monitor connected, and measure the supply outputs where they reach the main board.
- Reconnect everything and power up through a plug-in wattmeter. Sharp's rating is 49 W; a reading that keeps climbing, or a supply that cuts out, means stop and look again.[3] X1 Center used a wattmeter and a current-limited source when testing a repaired X1 supply.[5]
- Check that the IPL menu appears and that the drive light comes on and goes out, as described in Normal start-up.
Related pages
[edit | edit source]- Sharp X1D
- Sharp X1D General Maintenance
- Sharp X1D Troubleshooting Guide
- Sharp X1 Capacitor Replacement Guide, for the first X1 model
- Capacitor Failure Symptoms
References
[edit | edit source]- ↑ 図面資料, X1 Center—link(accessed 2026-10-21) Schematics hosted: CZ-800C (X1) Rev. 4 from I/O magazine; CZ-850C/851C/852C (X1turbo) from Oh!MZ and I/O; CZ-8RL1 data recorder. No X1D schematic.
- ↑ 祝一平 (Iwai Ippei), "X1DにCZ-8RL1をつないでしまう", Oh!MZ, December 1985, pp. 54-62: a modification to let the X1D control the CZ-8RL1, with a drawing of the X1D's cassette control circuit; no power supply circuit. Scan on the Internet Archive, item oh-mz-1985, file Oh!MZ_1985-12.
- ↑ 3.0 3.1 Oh!MZ, November 1983, p. 26, Table 1: power consumption 49 W (X1D), 30 W (X1C); AC 100 V ±10 %, 50/60 Hz. Scan on the Internet Archive, item oh-mz-1983-08-12, file Oh!MZ_1983-11.
- ↑ 時計バックアップ用ニッカド電池, X1 Center—link(accessed 2026-10-21) Leaking NiCd clock cells in X1 machines corrode the plated holes and tracks around them.
- ↑ 5.0 5.1 CZ800C電源修理・・・できなかった。, X1 Center—link(accessed 2026-10-21) First X1 (CZ-800C) switching supply, ZEBRA-made: all electrolytics but one replaced; tested afterwards, the large first-stage primary capacitor had lost 12 per cent and the rest were normal, though leakage at high voltage may have increased; primary side about +144 V.