Seiko Cal. S026A Parts Catalogue and Technical Guide

Complete parts catalogue and technical guide for the Seiko Cal. S026A digital module, essential for watch technicians and repair specialists working with this quartz movement. Provides detailed specifications for the 40mm outside diameter case, 23.6mm inner diameter, and 4.6mm height, along with comprehensive documentation of the nematic liquid crystal FEM display and its multiplex driving architecture. Covers all functional aspects including stopwatch display, integrated time and calendar features, and the automatic calendar mechanism that maintains accurate date advancement. The service manual includes fully annotated parts diagrams and exploded views of the complete case assembly, clearly identifying the case back, gaskets, battery compartment, crystal unit cushion, connector configuration, and liquid crystal panel layout. Step-by-step disassembly and reassembly sequences ensure proper handling during maintenance and repair work. Battery specifications detail compatible options: SEIKO SR41W, Maxell SR41W, SONY SR41W, or EVEREADY 392 cells rated at 1.55V with approximately 2.5 year operational life under normal conditions. Lubrication requirements are precisely specified, calling for silicone oil 500,000 cs for critical bearing surfaces and SEIKO Watch Oil S-6 for escapement and gear trains. An indispensable workshop resource for anyone servicing this popular digital quartz caliber.