This is the most critical section. The manual will usually break this down into sub-sections:
Before you can use it, you need to source it. Physical copies are rare, so most technicians opt for digital scans. Technics Sa-370s Service Manual
Instructions for calibrating the FM/MW/SW1/SW2 tuner and the Dolby cassette recording levels . This is the most critical section
"And you think this book is going to save it?" Technics Sa-370s Service Manual
For those performing repairs, service documentation usually covers these critical areas: