This comprehensive service manual provides detailed technical repair information for the Casio PR-420A DR-1212LA PRINTING DESKTOP CALCULATOR manufactured in 1995. It serves as an invaluable resource for anyone looking to repair, service, rebuild, or maintain this calculator to its original factory specifications. The manual delves into the inner workings of the device, offering detailed information about its specifications, block diagram, CPU pin functions, diagnostics, troubleshooting procedures, disassembly instructions, schematic diagrams, and a comprehensive parts list. Illustrated with clear diagrams and pictures, this manual simplifies the understanding of complex repair procedures. The content is organized in a clear and concise manner, allowing users to quickly locate the information they need.

The CASIO PR-420A DR-1212LA PRINTING DESKTOP CALCULATOR, manufactured in 1995, was a robust and versatile computing tool designed for professional and commercial use. This desktop calculator featured a built-in printer, allowing users to generate hard copies of their calculations and data. Its compact design, coupled with its powerful capabilities, made it a popular choice for various settings, such as offices, retail stores, and financial institutions. The PR-420A DR-1212LA was equipped with a range of advanced functions, including basic arithmetic operations, percentage calculations, memory storage, and tax calculations. It offered a user-friendly interface, making it accessible to individuals with varying levels of technical expertise. Beyond its computational capabilities, the PR-420A DR-1212LA featured a durable construction and reliable performance, ensuring consistent accuracy and longevity. Its printing mechanism enabled users to create permanent records of their calculations, providing a valuable reference for future analysis or documentation. The printer utilized a standard paper roll, making it easy to find replacement supplies. The inclusion of a service manual, which offered detailed technical information, ensured that users could maintain and troubleshoot their calculators effectively. This comprehensive guide provided valuable insights into the device's specifications, block diagrams, CPU pin functions, diagnostics, troubleshooting procedures, disassembly views, schematic diagrams, and parts lists, empowering users to perform repairs and maintain their calculators to optimal factory settings.