Service Manual CAL.V744C - Seiko Quartz Movement

Complete service manual for the Seiko Cal.V744C quartz movement, covering all technical specifications and repair procedures for this precision timekeeping module. Movement dimensions: outside diameter ∅26.4mm (23.5mm between 6-12 o'clock, 23.5mm between 3-9 o'clock), casing diameter ∅25.6mm (23.5mm between 6-12 o'clock, 21.9mm between 3-9 o'clock), height 2.78mm. The movement features three-hand time display with integrated day and date calendar function, instant setting device, train wheel setting mechanism, and electronic circuit reset switch. Drive system uses a load-compensated step motor with compensated driving pulse operation. With no regulation system required, monthly rate stays below 20 seconds at normal temperature. Documentation includes a hand installation height discrimination table (numerals 1-2 with corresponding movement reference numbers), circuit block structure diagram (Part No. 4000 833, showing C-MOS-IC with crystal unit and complete terminal specifications), and essential performance data including coil block resistance range 1.18-1.68 kΩ, total movement current consumption under 1.2µA, and isolated circuit block consumption below 0.28µA. Power source: SEIKO SR920SW, MAXELL SR920SW, SONY SR920SW, MATSUSHITA SR920SW, or EVEREADY 371 cells (1.55V, approximately 5-year service life). Movement contains 1 jewel bearing. For after-sales servicing, the workshop manual covers whole movement replacement procedures, with circuit block components available separately from Seiko.