Seiko Quartz Cal. 8222A/8223A/8229A Technical Data

Technical data manual for Seiko Quartz movements 8222A, 8223A and 8229A rated water resistant to 10 atmospheres. This service manual covers the complete technical specification and operation of these three-hand movements with integrated date calendar system, electronic reset switch and seconds setting device. The documentation details the internal circuit block architecture including the trimmer capacitor and crystal oscillator that regulate timekeeping. Step-by-step disassembly and reassembly procedures are provided for all major components: the calendar mechanism, dial-side parts, circuit block, coil block and four-jewel gear train, along with lubrication points and techniques. Checking and adjustment procedures address critical performance parameters including output signal verification, hand setting accuracy, battery voltage and conductivity testing, circuit block conductivity verification, reset mechanism function, gear train operation, setting mechanism response, calendar function, movement accuracy, current consumption measurements and water resistance validation. This workshop manual serves as the authoritative technical reference for service technicians and qualified repairers working with these popular Japanese quartz movements.