Seiko Lassale Quartz Cal. 9442A/9443A Technical Data

Technical data and service reference for Seiko Lassale quartz watches caliber 9442A and 9443A. This workshop manual covers complete specifications for both movements, including 3-hand timekeeping, electronic circuit reset functionality, and train wheel setting mechanisms. Details the dual crystal oscillator design operating at 32,768 Hz and 40,960 Hz with trimmer capacitor regulation for frequency fine-tuning. Documents the 8-jewel movement rated for 1.55V mercury battery operation and includes battery life indicator circuitry. Provides circuit block architecture with main and auxiliary trimmer capacitors, MOS-IC components, and crystal oscillator configurations. Essential troubleshooting procedures cover output signal verification, battery voltage and continuity testing, circuit block conductivity checks, reset condition assessment, coil block operation, and current consumption measurement. Incorporates time accuracy testing methodology using the QT-99 Quartz Tester with QT-Adapter for precision validation. Case specifications: 25.6mm diameter with movement heights of 2.8mm (9442A) or 3.1mm (9443A) excluding battery. Practical reference for technicians performing calibration, diagnosis, and repair of these widely serviced Seiko movements.