Xerox Phaser 3300 Servce Manual page 63

Phaser 3300MFP Service Manual
Signal Transition of DAA Solution
Line Interface Signal of Tel Line and LSD is Analog Signal.
There is A/D, D/A Converter in LSD, so Analog Signal from Tel Line is
converted in Digital through A/D Converter in DAA and transfer to SSD by DIB
Capacitor.
Digital Signal from SSD is converted to Analog by D/A Converter in DAA and
transfer to Tel Line.
CX86710(SFX336)
SSD
DSP
System
Side
Device
Transformer transfer Clock from SSD to LSD and Clock Frequency is 4.032
MHz.
LSD full wave rectifies Clock to use as inner Power supply and also use as
Main Clock for DIB Protocol Sync between LSD and SSD. Transformer
transfer Clock by separating Primary and Secondary, and amplifies Clock
Level to LSD by Coil Turns Ratio 1:1.16.
Clock
Clock is supplied by transformer from SSD to LSD, and there is PWROUT to
adjust output impedance of Clock Out Driver is inside SSD and CLKSHIGH
Resistor to adjust duty of HLPWR Resistor and Clock.
SSD
Clock from SSD to LSD has Differential structure of 180 phase difference for
Noise Robustness
DIB Data transfer Data from SSD to LSD by Transformer, and also transfer
specific data from LSD to SSD.
After transferring data from SSD, RSP is transferred and LSD recognizes RSP
and change LSD to output Driver transfer Data to SSD.
DIB Data form SSD to LSD by Transformer has Differential structure of 180
phase difference between DIBP and DIBN for Noise Robustness.
1 0 1
Transformer
CX20493
LSD
Line
Side
Device
Transformer
Digital
CLKP
CLKN
DIBP
DIBN
Theory of Operation
Tel Line
Ext Line
Analog
s3300mfp-156
LSD
s3300mfp-157
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