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This warranty is valid only in the United States. For customers in the United States Owner's Record The model number is located at the bottom and the serial number is located inside the battery compartment. Record these numbers in the spaces provided below. Refer to these numbers whenever you call upon your Sony dealer regarding this product. Model No. Serial No. You are cautioned that any changes or modifications not expressly approved in this manual could void your authority to operate this equipment. WARNING To prevent fire or shock hazard, do not expose the unit to rain or moisture. M-637V/635VK/630V/ 535V/530V/430 Operating Instructions Sony Corporation Copyright 1999 Printed in China 3-865-285-72 (1) Precautions On power Operate the unit only on 3 V DC. For AC operation, use the AC adaptor recommended for the unit. Do not use any other type. For battery operation, use two size AA (R6) batteries. On the unit Use only the (standard microcassettes) with this unit. Non-standard cassettes cannot be used because their "L" dimension (see illustration) is different. Troubleshooting Should any problem persist after you have made these checks, consult your nearest Sony dealer. A cassette cannot be inserted. t The cassette is being inserted in the wrong way. t n has been already pressed. Playback cannot be made. t The tape has reached the end. Rewind the tape. t The batteries are weak. Replace both batteries with new ones. t The head is contaminated. Recording cannot be made. t There is no cassette in the cassette compartment. t The cassette tab has been removed. t The batteries are weak. Replace both batteries with new ones. t The head is contaminated. t Improper setting of the VOR switch (M-637V/635VK/ 630V/535V/530V only). Recording is interrupted. t The VOR switch (M-637V/635VK/630V/535V/530V only) is set to H or L. When you do not use VOR, set it to OFF. During CUE/REVIEW the tape stops or does not run. You cannot fast-forward or rewind. t The batteries are weak. Replace both batteries with new ones. The unit does not operate. t The batteries have been inserted with incorrect polarity. t The batteries are weak. Replace both batteries with new ones. t >PAUSE is slid in the direction of the arrow. t The AC power adaptor is connected to the unit only and you are going to use the unit on batteries. No sound comes from the speaker. t The earphone is plugged in. t The volume is turned down completely. The sound drops out or comes with excessive noise. t The volume is turned down completely. t The batteries are weak. Replace both batteries with new ones. t The head is contaminated. See "Maintenance". Tape speed is too fast or too slow in the playback mode. t Improper setting of the TAPE SPEED switch. Set it to the same speed as that used for recording. Tape speed is faster than the normal playback speed. t The FAST PB switch (M-637V/635VK/630V only) is slid in the direction of the arrow. Recording cannot be erased completely. t The head is contaminated. Maintenance To clean the tape head and path Press n and wipe the head, capstan and the pinch roller with a cotton swab, moistened with alcohol every 10 hours of use. To clean the exterior Use a soft cloth slightly moistened in water. Do not use alcohol, benzine or thinner. Specifications Tape (normal position type) Recording system 2-track 1-channel monaural Speaker Approx. 3.6 cm (17/16 in.) dia. Tape speed 2.4 cm/s (15/16 ips), 1.2 cm/s (15/32 ips) Frequency range 300 - 4,000 Hz (with TAPE SPEED switch at 2.4 cm/s) Input (M-637V/635VK/630V only) Microphone input jack (minijack/PLUG IN POWER) sensitivity 0.24 mV for 3 kilohms or lower impedance microphone Output Earphone jack (minijack) for 8 - 300 ohms earphone Power output (at 10% harmonic distortion) M-637V/635VK/630V/535V/530V 250 mW M-430 160 mW Power requirements 3 V DC batteries size AA (R6) 2/External DC 3V power sources Dimensions (w/h/d) Approx. 62.2 121.5 24.3 mm (21/2 47/8 31/32 in.) incl. projecting parts and controls Mass Approx. 125 g (4.5 oz) Supplied accessories AC power adaptor (1) (M-635VK only) Battery