Toshiba DP120F, Service Manual

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DP120F/DP125F Circuit Description 7-24 March 2000 © TOSHIBA TEC
(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).
(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 scanned 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 CODEC where it is coded in accord with the cording
format specified by the performance of the network. Then the coded data is transferred
to the PIX-DRAM.
(7) The coded data is transferred to the PC interface of the PTC GA and then to the GD-1040
and GF-1010. The MH coded data is converted to an attached file in emailing by the GF-
1010. Then it is sent to the Internet through the mail server via the network.