Maintenance Getting Started - Simple Fault Case Analysis of Fax Machine
[Office Partner Information Center] The fax machine can't receive the fax, or the fax machine does not respond when receiving, or the blank paper appears when the fax machine receives the fax, and the paper jam sometimes occurs, which makes many office workers feel Headache, in fact, many faults are very simple, as long as you usually pay attention to it, you can easily handle the fault.
The fax machine cannot hear the fax transmission signal.
Symptom: A SUNTECH STFFAX 188 fax machine, when turned on, when the fax is sent, the other party cannot hear the fax transmission signal; when receiving, the machine does not start.
Analysis and overhaul: According to the fault phenomenon, the self-test procedure is first carried out. After pressing the “FINE†button for about 5 seconds, the machine will make five sounds and press the “START†button at the same time. It will not self-test and the fault will remain.
fax machine
Since there are no ready-made drawings and materials at hand, the following three steps are performed separately:
1. Check the assembly quality of the whole machine to see if there are plug-in open circuits, poor contact, and component solder joints.
2. Check all components in the machine to see if there is any overheating, smoke or burnout;
3. Check if the DC power output in the machine is normal.
Careful inspection revealed that the circuit board was soldered reliably, the assembly quality was good, and there was no burnout. When checking the working state of the power supply in the machine, according to experience, the normal voltage of each power supply is estimated by the power supply requirements of the known components. For example, the 74 series TTL circuit chip uses +5V voltage, and the MC1488 driver uses ±12V voltage.
After testing, it was found that the motherboard power supply voltage has ±5V, +24V, -12V voltage, no +12V voltage. After power off, measure the DC resistance of the fax machine main board +12V to ground is 90Ω, obviously not due to short circuit.
Ten strokes must kill the common simple faults of fax machines
Today's fax machines are more and more comprehensive, and the internal structure is becoming more and more complicated. Therefore, the fax machine will inevitably have many problems during daily use. The author below lists the most common problems of fax machines, and the corresponding solutions or troubleshooting methods.
First, the paper jam
“Paper jam†is a malfunction that is very easy for fax machines, especially when using new paper or used paper. If “jam†occurs, be careful when picking up the paper. Only move the parts that are allowed to move on the fax machine manual, and do not blindly pull the cover. Also take out the whole paper as much as possible, taking care not to leave the broken paper in the fax machine.
Second, when faxing or printing, the paper is all white
If your fax machine is a thermal fax machine, it may be that the front and back of the recording paper are incorrectly installed. Please place the reverse side of the recording paper and try again. The fax paper used in the thermal fax machine is coated with only one side of the chemical. Therefore, the installation is wrong and no text or pictures will be printed when receiving a fax.
If your fax machine is an inkjet fax machine, it is possible that the nozzle head is blocked. Please clean the inkjet head or replace the ink cartridge.
Third, the paper appears black line when faxing or printing
One or several black lines appear when you send a file to you or a file you printed at copy time. If it is a CCD fax machine, the reflective lens may be dirty. If it is a CIS fax machine, the light-transmissive glass may be dirty. Please use a cotton ball or a soft cloth dipped in alcohol to clean according to the instruction manual of the fax machine. If the problem still cannot be solved after cleaning, please send your fax machine for inspection.
Fourth, the paper appears white line when faxing or printing
Usually this is due to broken wires or dirt on the thermal head (TPH). If it is broken, replace the thermal head of the same model. If dirt can be removed with a cotton ball.
Fifth, the paper can not be fed out normally
Check that there is a foreign object jam in the feeder section, the original position scanning sensor is disabled, and the paper feed roller gap is too large. In addition, check whether the sending motor rotates. If it does not rotate, check whether the circuit related to the motor and the motor itself are damaged.
6. The phone is in normal use and cannot send and receive faxes.
If your phone shares a phone line with the fax machine, check that the phone line is connected incorrectly. Insert the telephone line of the telecommunications office into the “LINE†jack of the fax machine and the extension of the telephone into the “TEL†jack of the fax machine.
Source: Internet
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