13. IMAGE FUSING
13.1 FUSING LAMP CONTROL CIRCUIT
The circuit of the main board is different from the A151 and A152 copiers at
the indicated (dashed circle) location.
13.2 OVERHEAT PROTECTION
IC120 and Q101 form an overheat protection circuit. When the fusing lamp is
controlled within the normal range, pin 1 of IC120 stays LOW; therefore,
Q101 stays on, allowing PC402 to operate. If the hot roller temperature
reaches 240
°
C, the resistance of the thermistor becomes too low. At that
time, pin 1 of IC120 becomes HIGH, turning off Q101 and stopping PC402.
At the same time "E53" lights on the operation panel and the power relay
(RA401) turns off.
Even if the thermistor overheat protection fails, a thermoswitch installed in
series with the fusing lamp prevents the fusing unit from excessive
overheating. If the thermoswitch temperature reaches 170°C, the
thermoswitch opens, removing power from the fusing lamp.
T401
A203D510.wmf
IMAGE FUSING
A202/A203
8-20
SM
Содержание A151
Страница 1: ...SERVICE MANUAL PN RCFM3213 A151 A152 A202 A203 RICOH GROUP COMPANIES ...
Страница 2: ...SERVICE MANUAL A151 A152 A202 A203 RICOH GROUP COMPANIES ...
Страница 3: ...A151 A152 A202 A203 FIELD SERVICE MANUAL PN RCFM3213 ...
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Страница 27: ...OVERALL MACHINE INFORMATION ...
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Страница 33: ...GUIDE TO COMPONENTS ...
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Страница 43: ...INSTALLATION ...
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Страница 55: ...SERVICE TABLES ...
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Страница 95: ...REPLACEMENT AND ADJUSTMENT ...
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Страница 193: ...TROUBLESHOOTING ...
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Страница 251: ...DOCUMENT FEEDER A296 ...
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Страница 277: ...A202 A203 SERVICE MANUAL ...
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Страница 337: ...DOCUMENT FEEDER A662 ...
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Страница 359: ...TECHNICAL SERVICE BULLETINS ...
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Страница 372: ...Tech Service Bulletin No 3013 3213 008 Page 2 of 3 Continued ...
Страница 373: ...Tech Service Bulletin No 3013 3213 008 Page 3 of 3 ...