IMAGE FUSING AND PAPER EXIT
B039/B040/B043
6-66
SM
6.1.6 OVERHEAT PROTECTION
If the hot roller temperature becomes greater than 230
°
C for more than 1 second,
the CPU cuts off the power to the fusing lamp. At this time, the LCD will display
SC543.
Even if the thermistor overheat protection fails, there is a thermostat in series with
the common ground line of the fusing lamp. If the temperature of the thermostat
reaches 180
°
C, the thermostat opens, cutting the power to the fusing lamp, and
printing stops. At the same time, SC544 or 546 is generated. After resetting the
SC, when turning on the main switch, SC541 will appear.
There is also a thermofuse to ensure overheat protection. If the temperature of the
thermofuse reaches 172
°
C, the thermofuse opens, cutting the power to the fusing
lamp. The thermofuse is farther from the hot roller than the thermostat, so it opens
later than the thermostat.
Summary of Contents for LD013
Page 1: ...001129MIU SERVICE MANUAL B039 B040 B043 B120 RICOH GROUP COMPANIES...
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Page 3: ...SERVICE MANUAL B039 B040 B043 B120 RICOH GROUP COMPANIES...
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Page 5: ...B039 B040 B043 B120 SERVICE MANUAL 001129MIU...
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Page 31: ...INSTALLATION...
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Page 61: ...PREVENTIVE MAINTENANCE...
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Page 67: ...REPLACEMENT AND ADJUSTMENT...
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Page 125: ...TROUBLESHOOTING...
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Page 140: ...SERVICE TABLES...
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Page 192: ...DETAILED SECTION DESCRIPTIONS...
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Page 270: ...AUTO REVERSE DOCUMENT FEEDER B379...
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Page 300: ...DOCUMENT FEEDER B387...
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Page 324: ...PAPER TRAY UNIT B384...
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Page 344: ...PAPER TRAY UNIT B385...
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Page 362: ...SPECIFICATIONS...
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Page 373: ...B120 RLA only...
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Page 379: ...FAX UNIT B404...
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Page 383: ...INSTALLATION...
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Page 393: ...PREVENTIVE MAINTENANCE...
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Page 397: ...REMOVAL AND REPLACEMENT...
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Page 403: ...TROUBLESHOOTING...
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Page 416: ...SERVICE TABLES...
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Page 490: ...DETAILED SECTION DESCRIPTIONS...
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Page 498: ...SPECIFICATIONS...
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Page 510: ...FIRMWARE HISTORY...
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