■ Open door detection
This product detects door opening by the door open sensor.
Sensor Name
Function
Front Cover Sensor (SR612)
Detect open the Front Cover.
Rear Cover Sensor (SR613)
Detect open the Rear Cover.
When this sensor detects door opening, the DC controller stops driving motors and solenoids.
■ Low-Voltage Power Supply Control
This circuit converts AC voltage input from the power supply receptacle through the fixing power supply into DC power supply
and supplies it to each load.
See the figures below for low-voltage / fixing power supply block diagrams.
• Low-voltage power supply: generates DC power supply required in the printer.
• Fixing power supply: supplies AC power supply to the low-voltage power supply and control the fixing heater temperatures.
The low-voltage power supply is actuated when the AC power supply is attached to the inlet and the power switch is turned on.
The AC power supply supplied through the fixing power supply is converted to + 24V and + 3.3V of the DC power supply in the
low-voltage power supply before supplied to the printer engine.
Noise Filter
Fuse
FU1101
Fuse
FU1102
Fuse
FU1201
Fixing Power Supply
Rectifying
Circuit
Main
Controller PCB
3.3V
24S_ON
24V
Low-voltage Power
Supply (all night)
Power
Switch
SW1
DCON_ON
24V DCON
24V REM
3.3V DCON
AC input
Protection
Circuit
Frequency
Detecting
Circuit
㼆㻱㻾㻻㼄
Noise Filter
Fixing
Control
Circuit
Controller PCB
+24V
Generation
Circuit
+3.3V
Generation
Circuit
DC
■ Protective control
The low-voltage power supply has protective controls against excessive current and voltage, which automatically detect excessive
current or abnormal voltage to shut off the output voltage for avoiding the power supply circuit failures.
In case the DC voltage output is not detected from the low-voltage power supply, the protective control may be activated. Turn
off the power switch and remove the AC power supply from the inlet to settle load troubles. Once these are settled, turn on the
power switch again.
Another protective control is provided by 2 power fuses on the fixing power supply. These are open when excessive current is
detected to shut off power supply to low-voltage power supply.
■ Power-Saving Mode
This is the function to save power consumed by the printer.
The table below lists various power-saving modes.
2. Technical Explanation
27
Содержание MF724Cdw
Страница 1: ...Revision 2 0 MF720 Series Service Manual ...
Страница 12: ...Product Overview 1 Product Lineups 5 Product Features 7 Specifications 8 Name of Parts 14 ...
Страница 33: ...How to release Jam Remove the jammed paper and open close the ADF upper cover 2 Technical Explanation 25 ...
Страница 79: ...4 Click Import Export Import 1 2 2 Technical Explanation 71 ...
Страница 101: ...Periodical Service 3 Periodically Replaced Parts 94 Durable Parts 95 Periodical Services 96 Cleaning 97 ...
Страница 102: ...Periodically Replaced Parts No periodically replaced parts is set for this product 3 Periodical Service 94 ...
Страница 103: ...Durable Parts No durable parts is set for this product 3 Periodical Service 95 ...
Страница 104: ...Periodical Services No periodical service is set for this product 3 Periodical Service 96 ...
Страница 232: ...Adjustment 5 Overview 225 Adjustment at Parts Replacement 226 ...
Страница 248: ...Troubleshooting 6 Test Print 241 Trouble shooting items 243 Version Upgrade 244 Debug Log 248 ...
Страница 258: ...Error Jam Alarm 7 Outline 251 Error Codes 252 Jam Code 257 ...
Страница 267: ...Service Mode 8 Overview 260 COPIER 264 FEEDER 300 FAX 302 TESTMODE 308 ...
Страница 322: ...APPENDICES Service Tools 315 General Circuit Diagram 316 Print Sequence 317 Backup Data 318 ...