This comprehensive service manual provides a wealth of technical information for repairing, servicing, rebuilding, or maintaining your 1995 Casio PR-420A DR-1212LA Printing Desktop Calculator. It is a valuable resource for anyone who wants to understand the inner workings of this calculator and perform repairs effectively. The manual covers a wide range of topics, including detailed specifications, a block diagram illustrating the calculator's architecture, a breakdown of CPU pin functions, diagnostic procedures for identifying problems, troubleshooting tips, disassembly instructions with clear illustrations, a detailed schematic diagram for tracing circuits, and a comprehensive parts list. This manual is designed to be user-friendly, and all pages are printable, allowing you to conveniently access the information you need. With clear diagrams and explanations, this service manual is your go-to resource for ensuring your Casio PR-420A DR-1212LA calculator remains in optimal working condition.

The Casio PR-420A DR-1212LA is a robust and feature-rich printing desktop calculator designed for business and professional use. This calculator is renowned for its reliability and performance, offering a wide range of functionalities to streamline calculations and enhance productivity. It boasts a large, easy-to-read display with extra-large digits, ensuring clear visibility of numbers and calculations. The PR-420A DR-1212LA also features a built-in printer, providing the convenience of hard copies for record-keeping and audit trails. The printer utilizes thermal technology for fast and quiet operation, eliminating the need for ink cartridges. This model offers various calculation functions, including basic arithmetic operations, percentages, markups, discounts, and tax calculations, making it suitable for a variety of accounting and financial tasks. Beyond its standard functionalities, the Casio PR-420A DR-1212LA incorporates advanced features that enhance its versatility and user experience. It includes a grand total memory function, allowing users to accumulate totals for multiple calculations and retrieve them with ease. The calculator also has a built-in calendar function for tracking dates and appointments, further contributing to its utility as a desktop companion. With its durable construction and user-friendly design, the PR-420A DR-1212LA has earned a reputation for reliability and longevity, making it a valuable asset for individuals and businesses alike. This printing desktop calculator is specifically designed for those seeking a reliable and efficient tool for handling everyday calculations and generating printed records for accurate documentation and reference.