Toshiba DP120F Service Manual page 324

(1) The CIS detects the LED array's light reflected by a document as an analog electric
signal and sends it to the DSC (IC59).
(2) The DSC converts the electric signal to a digital signal and subjects it to data correction,
then converts it to raster data. The raster data is serially transferred to the DSC interface
of the PTC GA (IC45).
(3) The raster data is converted from serial to parallel data by the DSC interface of the PTC
GA and transferred to the PIX-DRAM (IC25).
For sort copy, go to step (4).
For normal copy, go to step (6).
(4) The raster data is transferred to the CODEC (IC51) through the CODEC interface of the
PTC GA where it is coded to data in the JBIG format. Then the JBIG coded data is
transferred to the SYS-DRAM (DP120F: IC34, IC41/DP125F: IC46). This allows the
coded data for all the documents for copying to be stored in the SYS-DRAM.
(5) The JBIG coded data is transferred to the CODEC where it is decoded to raster data.
Then the raster data is transferred to the PIX-DRAM.
(6) The raster data is transferred to the PTC interface of the PTC GA.
(7) The raster data is serially transferred to the EET (IC39) where it is smoothed. Then the
raster data is serially transferred to the PTC interface of the PTC GA.
(8) The raster data is converted to LSU print data by the PTC interface and sent to the LSU.
The LSU is driven according to the received print data for printing on the recording paper.
March 2000 © TOSHIBA TEC 7-15 DP120F/DP125F Circuit Description