2031 LP CIRCUIT THEORY

Write Amplifier Circuits

During a write operation, UG4, pin 3, must be "high". This forward biases Q3 and CR9. If Q, of UF6, pin 9, goes "low", Q8 and CR7 become forward biased, passing current flow through R/W 1. If-Q, goes "low", Q11 and CR10 become forward biased, passing current flow through R/W 2. When a write operation occurs, the ERASE coil is energized by forward biasing Q10. This demagnetizes the outer edges of the track, preventing data on one track from bleeding into the next track.