[. . . ] Any differences in operation are clearly indicated in the text, for example, "TCM-333 only". DC IN 3 V jack (TCM-333 only) accepts: ­ AC-E30HG AC power adaptor (not supplied) suitable in the country where the unit is to be used. [. . . ] ⷠ(TCM-333 only) Dry batteries will not be expended when another power source is connected. The model number is located at the bottom and the serial number is located inside the cassette holder. Refer to these numbers whenever you call upon your Sony dealer regarding this product. We do not recommend the use of tapes longer than 90 minutes except for a long continuous recording or playback. If you have any questions or problems concerning your unit, please consult your nearest Sony dealer. Note Do not use a CrO2 (TYPE II) or metal (TYPE IV) tape, otherwise the sound may be distorted when you play back the tape, or the previous recording may not be erased completely. Should any problem persist after you have made these checks, consult your nearest Sony dealer. To reuse the tape for recording, cover the tab hole with adhesive tape. The AC power adaptor or car battery cord is not firmly connected (TCM-333 only). The batteries have been inserted, but simultaneously the AC power adaptor is connected and not to be done to the wall outlet (TCM-333 only). [. . . ] Search forward during playback (CUE) Search backward during playback (REVIEW) Fast forward** Rewind** Start recording during playback To clean the tape heads and path Wipe the heads, pinch rollers, and the capstans with a cotton swab moistened with alcohol every 10 hours of use. ** If you leave the unit after the tape has been wound or rewound, the batteries will be consumed rapidly. [. . . ]