Sony D-202
A Discman whose service documentation survives far better than its reputation does. HiFI-Stereo (October 1991, p.103) covered the era's portable audio market in which this player competed.
Overview
The Sony D-202 is a portable CD player that turns up in estate lots and flea-market bins with a dead laser and a hopeful price tag. Whether you should buy one depends on whether the documentation matters more to you than the player does. What survives in the archive for this model is not a spec sheet but a service manual, and a substantial one. The electrical parts lists, semiconductor location tables, and printed wiring board diagrams indexed under the D-202 name describe a machine built around a CXA1497AN IC and a lot of discrete parts: 1SS119 and MA728 diodes, 2SC1623 and 2SC2786 transistors, ceramic chip capacitors, metal glaze resistors, and ferrite beads scattered across the board.
The D-202 was not a single-chip wonder. Its audio and REC/SW/MD sections each got their own printed wiring board and their own semiconductor location table. The documentation also separates the Canadian model from the "Tourist" model, so Sony was shipping this thing into multiple markets with at least some regional variation in parts. The service notes flag that replacements in the parts list may differ from what was originally specified, because of standardization. They also say items marked with a star were seldom required for routine service. So even Sony's own literature points to repair by substitution and patience rather than exact-part matching.
The documentation does not give a headline specification. There is no output power figure, no frequency response, no battery life rating, no weight, no price, and no production year anywhere in the material available for this model. The manual chunks are dense with component values - 0.1µF ceramic capacitors at 50V, 22µF electrolytics at 25V, 10K and 68K metal glaze resistors at 1/10W, 6.8µH and 3.3µH inductors - but component-level data is not a product specification, and this page won't pass it off as one. Anyone claiming a definitive D-202 spec sheet is working from something other than the sources this archive has.
One useful technical detail does come out of the service notes: the D-202's power voltage is DC 4.5V, fed from an external power voltage jack, and voltages in the manual were taken with a VOM at 10MΩ input impedance. That 4.5V figure matters when you have a dead unit and a wall wart of unknown origin. The player wants a regulated 4.5V supply, not whatever 6V adapter is rattling around in the drawer. The manual also notes that voltage variations should be expected due to normal production tolerances, so two D-202s from the same run may not measure identically.
Collectors who have handled these early Discmans generally treat them as display pieces first and players second. The laser assemblies are the usual failure point on portables of this generation, and the D-202 is not documented here as an exception. There are no confirmed production years, no price data, and no reception record for it. The service documentation is unusually complete for a player of its apparent vintage.
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