Seiko V657 Parts Catalog - Page 6

TECHNICAL GUIDE Cal. V657A • Distinction of wheels Parts Step rotor (A) Step rotor (B) Center wheel and pinion Third wheel and pinion Fourth wheel and pinion 1 I Shape 1 Parts No. 4146 890 4146 177 0221 368 0231 890 0241 407 Parts Fifth wheel and Fifth wheel and 1 Minute wheel pinion (A) pinion (B) and pinion Setting wheel Shape Parts No. _ 0701 890 0701 357 0261 176 0281 890 Remarks: Reassemble the step rotor (B) with its pinion facing the main plate side. TECHNICAL GUIDE O Train wheel setting lever 54 Setting lever CI Yoke • Setting position r/ 0 Remarks: Check that the contact spring of the yoke is not deformed. Cal. V657A Settirie lever 'Noon vvhool selling Inver ---- Yoko IV. VALUE CHECKING • Coil block resistance 1.9Ki2 2.3Kt2 • Measuring time accuracy When measuring time accuracy, make sure that the stopwatch is stopped. Otherwise, correct accuracy cannot be obtained. • Current consumption For the whole movement For the circuit block alone Less than 3.0µA Less than 1.5µA 14' Before measuring the current consumption, short-circuit the AC terminal of the circuit block and battery connection (+) with conductive tweezers. 11 12 95.1 Printed in Japan