5 ways fax machine maintenance bu qiuren not fear failure - Articulators Manufacturer

Analysis and Maintenance: According to the failure analysis of phenomena, can automatically receive a fax machine, indicating Communicate No part of the circuit and other equipment failures. It should first check the "START" button is normal, normal test results.

And power for self-test, followed by pressing the "FUN CT ION "function button the number" 7 "key " TEL / DIAL "key (4) " * "key, the machine into the equipment Test Way. Then press the number "3" key "START" key to self-start, automatic print out the data and function parameters table RAM. This function parameter list carefully, and found that all the initialization parameters have been set for the initial state, then fax machine has been automatically reset.

Therefore determine the machine equipment Power supply Circuit fault, the power supply circuit includes a POW1 Battery Components, transistors Q7, Q8, reset switch SW2 and other components. The circuit is mainly used for uninterrupted power supply to the RAM to ensure that the data parameters and the clock signal is lost due to power outages.

According to the analysis, first Multimeter Detection POW1 battery voltage is normal components, test results normal. SW2 switch position and then testing whether the normal exposure is good under normal circumstances, SW2 switch is "ON" on the block. With a multimeter "R × 1" piece block were measured along the weld SW2 Print Board lines off the situation, has been found, "ON" side lug in wet conditions due to the long-term mold off. Replacement, re-setting function of the value of troubleshooting.

Failure phenomena 2: Ricoh FAX188 a fax machine, copy for black.

Analysis and Maintenance: According to the breakdown phenomenon should first check the CIS Devices LED Arrays are light, LED arrays can be self test function. Followed by: "FUNCTTON" function button the number "6" key number "1" key number "9" key (2) number "5" key "YES" button. Followed in turn by the number "1" key number "0" key "YES" button the number "0" key "START" button, then LED array should be lit.

But after investigation does not light LED array. Then test whether the +24 V voltage and GLED whether low. Testing with a multimeter Motherboard CN6 connecting devices on the first 9,10 feet, found that +24 V voltage output, and 9 feet GLED side has remained high.

Double-check the drive the first 1,16 QA2R feet, found the first one foot in the boot can jump from the low to high, and 16 feet always remain the same. Therefore determine the drive is damaged, replace TD62003 after troubleshooting.

Failure phenomenon 3: Ricoh FAX188 a fax machine, copy for dark, some local black.

Analysis and Maintenance: According to the fax machine works know that, when given low light LED array, or analog Image Processing Circuit in the device is damaged, there will be more than this phenomenon.

Failure phenomena according to the first test for LED array, LED array light tested normal. Then check the analog image processing circuits, analog fax machines such image processing circuit mainly by operational amplifiers TL082 analog switches, HC4053 and external circuit.

TL082 CIS devices used to amplify the video signal sent, HC4053 connected to the device by selecting the analog switches, automatic adjustment Amplifiers Gain. If the analog switch is damaged, can cause the video signal output is too high, resulting in the phenomenon of copying a copy of fuzzy fault. Checked that the HC4053 is damaged, replace the device, the troubleshooting.

Failure phenomena 4: SUNTECH STFAX188 a fax machine, according to the user response, the aircraft often the following phenomena:

1. According to "FINE" button for about 5 seconds, to be issued after 5 tweet press "START" key, not self.

2. Boot and press "START" button does not start.

3. Send and receive faxes, press the "START" button, the called user can not hear the signal sound (9600b ps ), Do not take the paper; send the user a signal (9600bps), press "START" button is not responding.

Analysis and Maintenance: As no readily available information on the drawings, and more problems, which made it difficult to repair. Based on previous maintenance experience, from the following three aspects:

1. Check the overall assembly quality, with or without plug-ins open circuit, poor contact, components Weld and so on.

2. Observation of machine components within or without overheating, smoking, being burned out phenomenon.

3. Detection DC output voltage is normal.

After careful examination, found that the circuit board welding solid, reliable, good assembly quality, non-burned parts. Check the working status of machine power, according to the known components of the power supply voltage requirements projected supply requirements. Such as: 74 Series TTL circuit chips required for the +5 V voltage.

Test with a multimeter and found the motherboard with ± 5V,-12V, ± 24V supply voltage, etc., without the +12 V supply voltage. Broken power supply, motherboard +12 V measuring voltage side of the ground Resistance R11 is 90 , apparently not caused by short circuit due to no +12 V supply voltage. Open the lid, directly measured with a multimeter DC voltage output switching power supply, still no +12 V supply voltage.

Closer inspection, found that filtering Capacitance C24 (2200uF/16V) printed on Board Copper fracture, so +12 V open-circuit voltage without DC output voltage. Capacitor C24 feet while heating pad until the solder melted to C24 capacitor close to the printed circuit board, soldering is completed, restart your computer running, troubleshooting.

Failure phenomena 5: OF-17 fax a copy in overlapping copy printing, cutting short distance.

Analysis and Repair: Remove the lid, carefully examined and found that pulse components that drive the motor part of the roots of the first driven axle wear and tear due to long-term use led to a disruption. Fax machines in Japan, because of such production, pulse motor components and other accessories in the market difficult to purchase, and expensive.

Pulse motor according to some of the major components of the transmission characteristics of the composition of plastic parts. Use Adhesive Bonding, and breaks in the interpolation to increase the strength of nail. Adhesive bonding to be fully solidified after 24 hours, re-installed the boot operation, troubleshooting. Use more than six months, the effect has been very satisfactory.

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