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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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