Sony UP895 Service Manual - Page 27
Circuit Operation Description, A/D and D/A converters - up 895 paper
View all Sony UP895 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 27 highlights
Section 4 Circuit Operation Description Outline The electrical circuit of UP-895 mainly consists of the following blocks. * Video circuit The input video signal is amplified using a video amplifier circuit to perform brightness, contrast, trap filter, and AGC processing. * A/D and D/A converters The analog signal output from a video circuit is converted from analog to digital. The A/D-converted data is converted from digital to analog to output it to the outside. * Memory and head control G/A Print data is fetched to frame memory (DRAM). Image data on the memory is also PWM-converted for image processing and sent to the thermal head. * CLK generator This block generates the operation clock of memory and head control G/A. * Frame memory (SDRAM) This block memorizes print data. * Motor drive Each motor of a head, platen, and fan is driven according to the command from system control CPU. * Sensor circuit This block detects the sensor values of a head, paper, cutter, door, and head temperature. * System control CPU This block supervises and controls each block. UP-895/(E) 4-1