Samsung SCX4521F Service Manual - Page 90

Fax Modem Part, 5 . Pr i n t i n g Pr oc es s P ar t - drum unit

Get Samsung SCX4521F - B/W Laser - All-in-One PDF manuals and user guides
UPC - 635753616040
View all Samsung SCX4521F manuals
Add to My Manuals
Save this manual to your list of manuals

Page 90 highlights

- Phase : 2-2 Phase 2000PPS at Quick Scan, 2-2 Phase 1000PPS AT Fine Scan, 2-2 Phase 667PPS AT Super Fine Scan 4. Fax Modem Part 1) Modem Part The modem part is consist of FM336(FAX Modem chip), LIU(Line Interface Unit) and modem analog front end(AFE) functional part. * The feature of the SFM336 modem chip is as below; ① Communication Mode : Half Duplex ② Modem Method - GROUP 3 : ITU-T V34, V17, V29, V27ter - Tonal Signal : ITU-T T.30 - Binary Signal : ITU-T V.21, T.30 ③ Image Transmission Time : 3sec ( ITU-T NO.1 CHART/Memory Tx/ECM ) ④ Data Compress : MH, MR, MMR, JPEG ⑤ Modem Speed : 33600 / 28800 / 14400 / 12000 / 9600 / 7200 / 4800 / 2400 bps ⑥ Receive Level ⑦ Output Level : 0 ~ -48dBm - Adjustable : -6 ~ -15dBm ( 1dBm Step ) - Initial Setting : -12dBm ⑧Receive dynamic range: -. 0 dBm to -43 dBm for V.17, V.29, V.27 ter and V.21 -. -9 dBm to -43 dBm for V.34 halfduplex 2) The Gain of the Line signal can be adjusted by setting the register value of the FAX modem chip ,Tx and Rx path is almost directly connected to the impedance matching transformer of the LIU. - Adjust Tx Level within Setting Level+0,-2dB range. - Adjust Rx Level that has the same level as the TIMS out level if possible, and must not exceed the TIMS out level. 3) Speaker Driving Part Analog Switch(MC14053BD) makes a path for FAX Tone, Ring, Key click sound and Analog MUX (MC14051) makes a different signal level so that the the Speaker driver chip(MC34119) can driving the Speaker with different sound volume. 5. Printing Process Part Printing Process part is made of PC-Interface part, PVC(Priter Video Controller), LSU control part, High Voltage control part and Fuser Unit control part. PC-interface core is included in the Chorus2 ASIC and controls the PC-interface. LSU control part controls the LSU polygon motor, Laser diode, video data output so that the printing image can be made up on the OPC Drum.

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
  • 143
  • 144
  • 145
  • 146
  • 147
  • 148
  • 149
  • 150
  • 151
  • 152
  • 153
  • 154
- Phase
: 2-2 Phase 2000PPS at Quick Scan,
2-2 Phase 1000PPS AT Fine Scan,
2-2 Phase
667PPS AT Super Fine Scan
4. Fax Modem Part
1) Modem Part
The modem part is consist of FM336(FAX Modem chip), LIU(Line Interface
Unit) and modem analog front end(AFE) functional part.
* The feature of the SFM336 modem chip is as below;
①
Communication Mode : Half Duplex
②
Modem Method
- GROUP 3
: ITU-T V34, V17, V29, V27ter
- Tonal Signal
: ITU-T T.30
- Binary Signal
: ITU-T V.21, T.30
③
Image Transmission Time : 3sec ( ITU-T NO.1 CHART/Memory Tx/ECM )
④
Data Compress
: MH, MR, MMR, JPEG
⑤
Modem Speed
: 33600 / 28800 / 14400 / 12000 / 9600 / 7200 / 4800 / 2400
bps
⑥
Receive Level
: 0 ~ -48dBm
⑦
Output Level
- Adjustable
: -6 ~ -15dBm ( 1dBm Step )
- Initial Setting
: -12dBm
⑧
Receive dynamic range:
-.
0 dBm to -43 dBm for V.17, V.29, V.27 ter and V.21
-. -9 dBm to -43 dBm for V.34 halfduplex
2) The Gain of the Line signal can be adjusted by setting the register value of
the FAX modem chip ,Tx and Rx path is almost directly connected to the impedance
matching transformer of the LIU.
- Adjust Tx Level within Setting Level+0,-2dB range.
- Adjust Rx Level that has the same level as the TIMS out level if possible, and
must not
exceed the TIMS out level.
3) Speaker Driving Part
Analog Switch(MC14053BD) makes a path for FAX Tone, Ring, Key click sound
and
Analog MUX (MC14051) makes a different signal level so that the the
Speaker driver chip(MC34119) can driving the Speaker with different sound volume.
5. Printing Process Part
Printing Process part is made of PC-Interface part, PVC(Priter Video Controller), LSU
control part, High Voltage control part and Fuser Unit control part.
PC-interface core is included in the Chorus2 ASIC and controls the PC-interface.
LSU control part controls the LSU polygon motor, Laser diode, video data output so
that the printing image can be made up on the OPC Drum.