Panasonic DP-130 / DP-150 Service Manual / Other ▷ View online
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1. Memory Control Gate Array
GA2 (IC30) is a Memory Controlling Gate Array.
• DMA Control
It is used to transfer data between the following devices.
Scanning Control LSI (GA1)
Page Memory (S-DRAM)
: Scanning Route
Page Memory (S-DRAM)
CODEC (PM22)
: Coding Route
CODEC (PM22)
Page Memory (S-DRAM)
: Decoding Route
Page Memory (S-DRAM)
LSU Unit
: Recording Route
System Memory (S-DRAM)
Page Memory (S-DRAM)
: Report Route
• Rotation Management
The rotation is carried out by the hardware when transferring the route.
• S-DRAM Control
It generates S-DRAM Control Signal for Page memory and Refresh Control when the power is ON.
It does not backup the Page Memory.
• Picture Quality Correction Circuit (Smoothing)
When the receiving data (8 dot/mm x 3.85, 7.7, 15.4 line/mm) is converted to 600 dpi x 600 dpi
resolution, the current printed data and 15 surrounding printed data are sent to the Smoothing ROM
through 16 bit line and the ROM sends smoothed dot data. As a result of this operation, the distorted
curved lines are smoothed.
• Gray-Level Enhancement
This control function allows expressing higher-level scales than using a recorded signal, by reducing
line density into 1/2 or 1/3 on the original after binary-to-multiple value conversion. This capability
increases reproduction of grayscale images such as photographs.
• Reduction / Enlargement Control Circuit
This circuit is used to process the received data so that it fits on the recording paper, according to
the Fax Parameter Settings.
• Synchronization Control Circuit
This circuit is used to synchronize the output of the recorded data with the horizontal synchronizing
output signal from the printer for each line. It controls the resolution of the printer as follows.
16 dot/mm x 15.4 line/mm :
Report data
600 dpi x 600 dpi
:
Copy & Printer Interface
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• FIFO/S-RAM Control
Picture Edit Coding Gate Array uses FIFO for Smoothing & Laser pulse width control, and S-RAM
for Smoothing Data and interface controls.
• S-DRAM Control
It generates S-DRAM Control Signal for SORT Memory and Refresh Control when the power is ON.
It does not backup the Page Memory.
2. Optional Memory for Image Side
The Optional Memories are:
• Memory PC Board (SODIMM)
→
DRAM Card (16 MB) for Sort memory
Install the DRAM Card for Sort memory to CN11 (FX/FP Model)/CN27 (A/PA Model) on the SORT
PCB.
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1.1.3. Fax System Control Circuit
The System Control Block consists of the following IC that control the general Fax functions.
1. System CPU
The System CPU (SH7041) is a 32-bit RISC (Reduced Instruction Set Computer) type of CPU and
DMA Control, Serial Communication Port, Timer Control, Interrupt Control, DRAM Control, and I/O
Port are integrated into 1 chip. Mask ROM (64k byte) is already installed and it controls the Monitor,
High Speed managing Task and Boot Programming.
• DMA Control
It has a 4ch DMA Control and is used to transfer data between the following devices.
Communication CODEC (PM22)
←→
Image Data Memory (DRAM)
• Serial Communication Port
It has a 2ch Serial Communication Port and is used to interface the following devices.
CPU
←→
Sub-CPU (Energy Saving Microprocessor)
• Timer Control
It is used to program the standard timer.
• Interrupt Control
It controls receipt & transfer to CPU the interrupt from Modem, LSI, Option, etc.
• DRAM Control
It generates DRAM Control Signal and Refresh Control when the power is ON.
• I/O Port
It is used to control lines and reset control around LSI.
2. System Memory
This system consists of the following memory.
• F-ROM (IC)
→
F-ROM (2MB) for programming
• F-ROM (IC)
→
F-ROM (2MB) for programming
The program is booted from F-ROM Card.
• F-ROM (IC)
→
Image Data Memory (2MB)
During a blackout, the image data is backed up.
• DRAM (IC)
→
Work RAM, buffer (8MB) for transfer and reception
3. Optional Memory for System Side
The Option Memories are:
• F-ROM Card (2/4MB)
→
Image Data Memory for expansion
During a blackout, the image data is backed up.
It is possible to rewrite the program by rebooting the main program from this card.
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1.1.4. Scanning Circuit
1. Scanning LSI
GA1 (IC7) is a Scanning LSI and generates Shading Correction, MTF Correction, Reduction/
Enlargement, and Gray Scale Error Diffusion. The Image Signal is converted to binary signal and
transported.
2. TX Motor Drive Circuit
TX Motor Drive Circuit is controlled by SLA7032M and SCN PCB IC19, ADF PCB IC15.
1.1.5. Coding
Coding and decoding (MH/MR/MMR/JBIG conversion) is carried out by the hardware codec device.
There are 2 codecs, Image Codec and Communication Codec.
• PM-22 (IC32) : for Image Codec
It codes or decodes the data transferred from Sort memory. When copying, this codec codes from
the Image data to JBIG data. When communicating, this codec codes from Image data to MMR
data.
1.1.6. Sleep Mode
This function reduces the power consumption in standby mode. During Sleep Mode, power is supplied
only to the Energy Saver Lamp to keep it at a steady ON condition, to the circuit that monitors incoming
Ringing signals and to circuits that maintain Deferred communications. The power is recovered only
when an incoming Ringing signal is detected, the time to perform a Deferred communication has
lapsed or the Energy Saver key is pressed.
Recovers from Sleep Mode
No.
Item
Recovers from
Remark
Sleep Mode
1
When Energy Saver key is pressed
Yes
2
Deferred Communication time is lapsed
Yes
3
Time for Deferred Communication
Yes
4
Original Sensor is actuated
Yes
Not Document Sensor with Flatbed
5
Ringing signal detected
Yes
Not 1300Hz detection
6
Off-Hook (External telephone or Handset)
Yes
7
When printing from a PC
Yes
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