Toshiba A29019 Service Note

Publish Date: 99/05/26

M-FSA29019a(TF471-478).pdf

M-FSA29019a(TF610).pdf

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BSI No.: A29019
Subject:

Change the Service Manuals

Model: TF471, TF478, TF610

Category Field Application Unit

Modification/Correction of

Service Manual

Factory Application:

To be applied when necessary Operator's Manual/Service

CONTENT

1. Reason for Modification

To correct the information in the Service Manuals.

2. Details of Modification

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Manual

TF471/TF478

Refer to pages 7-8 to 7-15 attached.

TF610

Refer to pages 7-18 and 7-19 attached.

Attached Files

TF471/TF478

2.1 Facsimile Transmission Mode

2.1.1 Facsimile Memory Transmission Mode

7-02-01.eps

Fig. 7-2-1

(1) The CCD sensor mounted on the SCN PBA reads a document and converts it into analog data,

and then transfers the data to the DSC of the ENGINE (IC301).

(2) The DSC converts the analog data into digital 8-bit image data through the built-in A/D converter

and performs data correction processes such as background correction, ACC (Auto Contrast
Control), half-tone processing, and black and white (binary) processing. The HDMA of the MPU
transfers the corrected image data (digital/parallel) to the DRAM (IC307) in DMA mode.

(3) T o con vert the image data in the DRAM into the MMR compressed data which provides efficient

compression, the image data is transferred to the acceler ator of the TURBO by HDMA in DMA
mode.

(4) The image data is converted into the MMR compressed data by software processing and accu-

mulated in the SRAM (IC303).

(5) The MMR compressed data in the SRAM is transferred to the DRAM by software processing

and accumulated in the DRAM until the line is connected and the coding scheme of the destina­tion is found out.

Chapter 7 7-8 SERVICE MANUAL

TF471/TF478

(6) When the coding scheme of the destination is found out, the MMR compressed data in the

SRAM is transferred to the SRAM by software processing so that it is converted to data which
corresponds with the coding scheme of the destination.

(7) The MMR compressed data in the SRAM is transferred to the accelerator by software process-

ing.

(8) The MMR compressed data is converted into image data by software processing and trans-

ferred to the DRAM by the HDMA.

(9) The image data in the DRAM is transferred to the accelerator by the HDMA in DMA mode.

(10) The image data is converted into the data which corresponds with the coding scheme (MMR,

MH, or MR) of the destination and accumulated in the SRAM (IC303).

(11) The µDMA transfers the compressed data (MMR, MH or MR) transferred in DMA mode to the

modem in DMA mode.

(12) The modem modulates the compressed data (MMR, MH or MR) transferred in DMA mode into

analog data for telephone lines and transfers it to the AFE (IC324).

(13) The transferred analog data (for telephone lines) is transferred to the NCU PBA through the

equalizer and attenuator of the AFE and then sent to the telephone line.

SERVICE MANUAL 7-9 Chapter 7

TF471/TF478

2.1.2 Facsimile Direct Transmission Mode

7-02-02.eps

Fig. 7-2-2

(1) The CCD sensor mounted on the SCN PBA reads a document and converts it into analog data,

and then transfers the data to the DSC of the ENGINE (IC301).

(2) The DSC converts the analog data into digital 8-bit image data through the built-in A/D converter

and performs data correction processes such as background correction, ACC (Auto Contrast
Control), half-tone processing, and black and white (binary) processing. The HDMA of the MPU
transfers the corrected image data (digital/parallel) to the DRAM (IC307) in DMA mode.

(3) The image data is then transferred to the accelerator by the HDMA in DMA mode.

(4) The image data is converted into the data which corresponds with the coding scheme (MMR,

MH, or MR) of the destination and accumulated in the SRAM (IC303).

(5) The compressed data in the SRAM is transferred to the MODEM by µDMA in DMA mode.

(6) The modem modulates the compressed data (MMR, MH or MR) transferred in DMA mode into

analog data for telephone lines and transfers it to the AFE (IC324).

(7) The transferred analog data (for telephone lines) is transferred to the NCU PBA through the

equalizer and attenuator of the AFE.
The transferred analog data (for telephone lines) is sent to the telephone line through the NCU
PBA.

Chapter 7 7-10 SERVICE MANUAL

2.2 Facsimile Reception Mode

TF471/TF478

7-02-03.eps

Fig. 7-2-3

(1) The analog data (for telephone lines) received from the telephone line is transferred to the AFE

(IC324) of theTRC PBA through the NCU PBA.
The AFE converts the analog data into digital data.

(2) The digital data is transferred to the modem of the ENGINE (IC301).

(3) The data is transferred to the SRAM (IC303) by µMDA in DMA mode.

(4) The data in the SRAM is transferred to the DRAM by software processing and accumulated in

the DRAM.

(5) To conv ert the compressed data into image data for printing, the compressed data in the DRAM

is transferred to the SRAM by software processing.

(6) The compressed data in the SRAM is transferred to the accelerator by software processing.

SERVICE MANUAL 7-11 Chapter 7

TF471/TF478

(7) The compressed data is transferred to the image data by software processing, and transferred

to the DRAM by the HDMA. When the received data is longer than the effective range of the
recording paper, the received data is accumulated in the DRAM with several horizontal scan
lines deleted by software processing.

(8) The image data (digital/parallel) in the DRAM is transferred to the TPH interface by HDMA in

DMA mode.

(9) The image data (digital/parallel) transferred in DMA mode is tr ansferred serially to the TPH unit.

The TPH unit performs printing according to this data.

Chapter 7 7-12 SERVICE MANUAL

2.3 Copy Mode

2.3.1 Single Copy Mode

TF471/TF478

7-02-04.eps

Fig. 7-2-4

(1) The CCD sensor mounted on the SCN PBA reads a document and converts it into analog data,

and then transfers the data to the DSC of the ENGINE (IC301).

(2) The DSC converts the analog data into digital 8-bit image data through the built-in A/D converter

and performs data correction processes such as background correction, ACC (Auto Contrast
Control), half-tone processing, and black and white (binary) processing. The HDMA of the MPU
transfers the corrected image data (digital/parallel) to the DRAM (IC307) in DMA mode.
T o print data in reduction mode , the image data reduced by software processing is accumulated
in the DRAM.

(3) The image data (digital/parallel) in the DRAM is transferred to the TPH interface by HDMA in

DMA mode.
To print data in enlargement mode, the image data is enlarged by software processing and
transferred to the TPH interface.

(4) The image data (digital/parallel) transf erred in DMA mode is transferred serially to the TPH unit.

The TPH unit performs printing according to this data.

SERVICE MANUAL 7-13 Chapter 7

TF471/TF478

2.3.2 Multi-copy Mode

7-02-05.eps

Fig. 7-2-5

(1) The CCD sensor mounted on the SCN PBA reads a document and converts it into analog data,

and then transfers the data to the DSC of the ENGINE (IC301).

(2) The DSC converts the analog data into digital 8-bit image data through the built-in A/D converter

and performs data correction processed such as background correction, ACC (Auto Contrast
Control), half-tone processing, and black and white (binary) processing. The HDMA of the MPU
transfers the corrected image data (digital/parallel) to the DRAM (IC307) in DMA mode.

(3) To conv ert the image data in the DRAM into the MMR compressed data which provides efficient

compression, the image data is transferred to the accelerator of the TURBO by HDMA in DMA
mode.

(4) The image data is converted into the MMR compressed data by software processing and accu-

mulated in the SRAM (IC303).

(5) The MMR compressed data in the SRAM is transferred to the DRAM by software processing

and accumulated in the DRAM.

Chapter 7 7-14 SERVICE MANUAL

TF471/TF478

(6) To conv ert the compressed data into image data for printing, the compressed data in the DRAM

is transferred to the SRAM by software processing.

(7) The compressed data in the SRAM is transferred to the accelerator by software processing.

(8) The compressed data is converted into image data by software processing and transferred to

the DRAM by the HDMA.

(9) The image data (digital/parallel) in the DRAM is transferred to the TPH interface by HDMA in

DMA mode.

(10) The image data (digital/parallel) is transferred serially to the TPH unit. The TPH unit performs

printing according to this data.

SERVICE MANUAL 7-15 Chapter 7

TF610

• PC Data Transmit Function

Fig. 7-2-7

7-02-07.eps

Chapter 7 7-18 SERVICE MANUAL

(1) The serial data serially transmitted from the host computer is converted into MH-compressed

data (parallel) by the UART section of the CPU. The converted MH-compressed data is DMA­transferred to the DRAM (IC18, 21) by DMAC CH0 in the CPU (IC32).

(2) The transferred MH-compressed data is DMA-transferred to the CODEC of the DMAC

(CODECDMA) in the CODEC (IC20). The transferred MH-compressed data is converted into
image data (digital/parallel) by the CODEC, and DMA-transferred to the DRAM by the
CODECDMA.

(3) The transferred image data is DMA-transferred to the CODEC b y the CODECDMA. The trans-

ferred image data is conv erted into MMR-compressed data, and DMA-transferred to the DRAM
by the CODECDMA. Accordingly, the MMR-compressed data of the document to be transmit­ted from the host computer is stored in the DRAM.

(4) The stored MMR-compressed data is DMA-transferred to the CODEC by the CODECDMA.

The transferred MMR-compressed data is conv erted into image data (digital/parallel), and DMA­transferred to the DRAM by the CODECDMA.

(5) The transferred image data (digital/parallel) is DMA-transferred to the CODEC by the

CODECDMA. And it is converted into compressed data of whichever coding method of MMR,
MH, and MR that matches the machine of the destination, and DMA-transferred to the DRAM
by the CODECDMA.

TF610

(6) The compressed data (MMR, MH, MR) that has been transferred is DMA-transferred to the

MODEM (IC31) by DMAC CH1 of the CPU (IC32).

(7) The compressed data (MMR, MH, MR) that has been transferred is demodulated into analog

data for the telephone line. The analog data (for the telephone line) is transferred to the NCU
PBA.

(8) The transferred analog data (for the telephone line) is transmitted to the telephone line by the

NCU PBA.

SERVICE MANUAL 7-19 Chapter 7