Question about Lexmark T642 Laser Printer

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Why does the printer have no display and a red continuous light? and a brief alarm sound when turned on?

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Http://www.lexmark.com/publications/pdfs/t640/eng/ug.pdf


You will find your answer in that manuel.

Have a nice day

Posted on May 09, 2014

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It is most likely the low voltage alarm. Suggest connecting when the car is running with no load (110 volts not connected). If the alarm continues turn the unit off and on to reset.

Hope this helps?

Inverter Protection Features
• Short Circuit Protection. The inverter will automatically shut down until short is removed.
• Low Voltage Alarm. An alarm will sound when the voltage from the battery discharges to 10.5 +/- 0.5 volts DC. This is an indication that the battery needs to be recharged.
• Over Voltage Protection. The RED LED Indicator Light will illuminate and the inverter will automatically turn itself off when the input exceeds 16.5 +/- 1 volt DC.
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1 Answer

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Hello Friend, this is Z. Thank you for your post!

I see that your question is listed under Frigidaire refrigerator (FPRH19D7LF) and that the alarm is sounding. First, did your refrigerator previously experience a power loss? If the temperature of food rises to an unsafe level, the buzzer will sound and the red light, if equipped, will also glow. First, deactivate the alarm to your refrigerator by unplugging it or flipping the household circuit breaker. Wait approximately ten minutes and then turn on your refrigerator. After deactivating the alarm and your refrigerator has run approximately four hours, the red light/alarm should go off on its own. If the red light/alarm continues to stay on, your refrigerator may possibly have a communication problem with the control board, temperature control or a wiring harness. If this is the case, I would recommend connecting with an experienced technician to determine the underlying cause. Best!

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Hi Friend, this is Z. Thank you for your post!

Did your Electrolux refrigerator previously experience a power loss? If the temperature of food rises to an unsafe level, the buzzer will typically sound and the red light, if equipped, will also glow. Is your refrigerator beeping or did the alarm turn on? If so, first deactivate the alarm to your refrigerator by unplugging it or flipping the household circuit breaker. Wait approximately ten minutes and then turn on your refrigerator. After deactivating the alarm and your refrigerator has run approximately four hours, the red light/alarm should go off on its own. If the red light/alarm continues to stay on, your refrigerator may possibly have a communication problem with the control board, temperature control or a wiring harness. If this is the case, I would recommend connecting with an experienced technician to determine the underlying cause. Best - Z

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1 Answer

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Good Morning Friend, thank you for allowing me to assist you!

Did your freezer previously experience a power loss? If the temperature of food rises to an unsafe level, the buzzer will sound and the red light, if equipped, will also glow. First, deactivate the alarm to your freezer by unplugging it or flipping the household circuit breaker. It is good to wait approximately ten minutes and then turn on your freezer. After deactivating the alarm and your freezer has run approximately four hours, the red light/alarm should go off on its own. If the red light/alarm continues to stay on, your freezer may possibly have a communication problem with the control board, temperature control or a wiring harness. If this is the case, I would recommend connecting with an experienced technician to determine the underlying cause. - Z

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1 Answer

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Hello Dan, I am happy to assist you!

Did your refrigerator previously experience a power loss? If the temperature of food rises to an unsafe level, the buzzer will sound and the red light, if equipped, will also glow. First, deactivate the alarm to your appliance by unplugging it or flipping the household circuit breaker. Wait approximately ten minutes and then turn on your appliance. After deactivating the alarm and your refrigerator has run approximately four hours, the red light/alarm should go off on its own. If the red light/alarm continues to stay on, your freezer may possibly have a communication problem with the control board, temperature control or a wiring harness. If this is the case, I would recommend connecting with an experienced technician to determine the underlying cause.

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Hi Joseph, I am happy to assist you. If the temperature of food rises to an unsafe level, the buzzer will sound and the red light, if equipped, will also glow. First, deactivate the alarm to the unit by unplugging it or flipping the household circuit breaker. Wait approximately ten minutes and then turn on the unit. After deactivating the alarm and the unit has run approximately four hours, the red light/alarm should go off on its own. If the red light/alarm continues to stay on, the freezer may possibly have a communication problem with the control board, temperature control or a wiring harness. If this is the case, I would recommend connecting with an experienced technician to determine the underlying cause.

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1 Answer

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Good Morning Bob, thank you for your post! Did the unit previously experience a power loss? If the temperature of food rises to an unsafe level, the buzzer will sound and the red light, if equipped, will also glow. First, deactivate the alarm to the unit by unplugging it or flipping the household circuit breaker. Wait approximately ten minutes and then turn on the unit. After deactivating the alarm and the unit has run approximately four hours, the red light/alarm should go off on its own. If the red light/alarm continues to stay on, the unit may possibly have a communication problem with the control board, temperature control or a wiring harness. If this is the case, I would recommend connecting with an experienced technician to determine the underlying cause.

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2 Answers

Error light in my apc smart ups sc 1500va ups


1. Four beeps every 30seconds (On Battery LED will be illuminated)
This alarm indicates that the Battery PowerSupplied outlets are now supplying battery power as opposed to power from theutility. If the UPS determines that the input utility power is unsafe for yourcomputer equipment, the UPS will switch to battery power.
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2. Continuous Beeping (On Battery LED will beilluminated)
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3. Continuous Beeps for 30 seconds (BackUPS OFFICE 250 and 280 ONLY)
This alarm indicates the unit has detected anOverload condition after it has performed a self-test during start-up.

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This alarm indicates a severe Overload wasdetected while the unit was on-battery operation. This tone will continue tosound until the unit shuts down.

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1 Answer

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Kenmore Frostless Upright freezer model# 23971. The alarm sounded, all contents in freezer is frozen solid. We turned the alarm off, but the red light continues to blink. How do you reset the alarm and stop the red light from flashing? It has been 3 days now and every time we have check to see if the contents has started to defrost, there is no signs of defrosting, everything inside of the freezer remains frozen solid.

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1 Answer

When printer is set up to print, it makes a brief knocking sound and on little screen at top it says...unlock scanner


If the printer LCD screen continues to display the same error message, do the following:
Remove both cartridges from the printer.
Move the red lock switch (at the back of the printer) from the down position to the up position, and then move it back to the down position.
Unplug the printer and turn it onto its left side.
Then return the printer to the upright position and reapply the power supply.
Attempt this fix twice and then try to print and scan once more.
note : Installing the wrong upgrade file will not cause damage to the printer, but the LCD display will display some characters incorrectly. Downloading and installing the correct firmware will resolve this issue

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