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Second, the installation of attention 1. Power supply: Because the aircraft is more sensitive to power interference, it should be used to regulate the AC purification power supply with high precision.
2. Ground wire: Many experience shows that whether or not the ground wire and connection are correct or not has an extremely important effect on the safe operation of the imagesetter and the stability of the output quality. Specific requirements are as follows:
1 A grounding wire should be established separately. Its grounding resistance should be ≤ 4Ω, and the zero-ground AC voltage should be <1V.
2 It is advisable to make the placement machine and the phototypesetting machine share the same ground. In this way, in case of accidental live plugging and plugging, the possibility of damage can be minimized.
3. The exhaust fan should keep the pipeline open and the joints tight.
4. Signal cables, power cables, and air ducts should be routed under the anti-static floor to protect the circuit and prevent people from being deterred.
5. Leave more than 60cm on each side of the machine for easy maintenance.
Third, the use of precautions 1. On the film When the film should first pay attention to keep the film outside the film attached to the roller (poster with anti-word). This will ensure the best results when printing.
After the film is sucked onto the outer surface of the drum, the two rows of main air holes on the drum should be respectively wrapped around the head and the end of the drum to ensure that the film is firmly attached when the drum rotates.
If a filming phenomenon occurs after start-up, the machine shall be shut down in time and reloaded. If the phenomenon is still the same, the following parts should be inspected:
1 Is the film cassette in place and the shutter fully pulled open?
2 whether the film is creased or deformed.
(3) Whether the fan suction is weakened or not, whether the exhaust plastic pipe leaks or if there is foreign matter in the pipe.
4 whether the suction hole on the drum is blocked.
2. The lower sheet cassette should be installed in place, manual models should pay attention to the drum stop and then press the sheet key.
3. Adjustment of light intensity Determine the strength of light intensity, should be combined with the use of laser tube and the development of medicine temperature, time, concentration and film types and other considerations. The light intensity is enhanced, the blackness of the film is increased, and it is easy to paste the film, whereas the blackness becomes smaller. Suggested by the person responsible, once adjusted properly, it is easy not to move.
4. Photosetter horizontal screw and outdoor fan should pay attention to maintain lubrication.
Fourth, the basic maintenance and adjustment 1. Replacement of the laser tube This series of imagesetter consists of He-Ne laser tubes, mirrors, optical shutters, acousto-optic modulators, optical splitters, focusing mirrors and other optical components. Wherein, the life of the laser tube is generally about 2 years. When it is found that the film writing becomes gradually faded, and when there are broken strokes, after excluding the factors of the punching machine, the light path portion should be examined with emphasis. If the high-voltage power supply circuit is normal, you should consider replacing the laser tube. When replacing, first move the traverse carriage to the middle, then turn off the power supply, unscrew the two black caps, take down the ring spring, loosen the six screws in order, remove the laser tube from one side, and carefully remove the positive The negative plug, you can remove the old tube. When replacing the tube, the procedure is reversed. Note that the anode is connected to the positive terminal of the power supply, and the cathode is connected to the negative terminal of the power supply. When tightening the screws, the tips of the screws should be caught on the metal ferrules of the laser tube housing so as not to damage the glass tube housing. The next step is to readjust the position and angle of the laser tube so that the primary light hits the drum accurately through the focusing lens. In this step, remember not to change the angle of the mirror, the focusing lens, the beam splitter, and the acousto-optic modulator easily. Generally, a small mirror can be placed on the front of the focusing mirror to reflect the first-order light onto the wall, and the laser tube can be fixed repeatedly. Six screws, until the appearance of a horizontal row of uniform, equal brightness of the four small spot, the adjustment is complete.
2. Adjustment of the electromagnet The Hangzhou phototypesetter uses several electromagnets to perform some mechanical actions, such as positioning, resetting, loading, loading, etc., by pulling and releasing them. After using these electromagnets for a period of time, some locking nuts are loosened, resulting in inaccurate positioning, resulting in film shifting, difficulty in slicing, and failure of the cards. When adjusting, first loosen the tightening nut, adjust the screw to change the stroke height of the tie rod, and then tighten the lock nut.
3. Hall Switch Replacement The principle of this switch is to output a low level when there is a strong magnetic field, and to maintain a high level when there is no magnetic field. In Hangzhou photosetters, it is used in addition to the use of electromagnets, it is also used to generate the first row, friction wheel arrival signal.
Hall switch is not normal, there are two main situations: First, viscose aging, open plastic, causing the switch tilted, was touched by the adjacent moving parts; the other is an electrical failure, Hall switch failure, with a multimeter measurement, Regardless of the proximity of the magnet block, the output is a high (low) level. In both cases, the same type of Hall switch needs to be replaced. The method is as follows: First, when the machine is normal, it is necessary to correctly determine the performance of three pins (one for the power supply, one for the ground, one for the output, and pay attention to the power supply. There are two kinds of +5V, +15V) and record it for reference in the future measurement. When replacing, the machine should be powered off, and the Hall switch should be heated with a soldering iron to clean up the remaining solidified adhesive. The new Hall switch is fixed in the original position with 502 quick-drying glue, and then the pin and the corresponding solder joint are fused and fixed. You can.
V. Maintenance and troubleshooting performed by full-time personnel The following maintenance requires the implementation of technical personnel with a certain digital circuit basis, so it is called full-time personnel maintenance.
The content described in this section assumes that the RIP card in the dispatcher is normal. If it is not easy to determine, see section VI.
There are many models of Hangzhao photosetters, but the basic principles are similar. In the following, the CBTX-04, which is the Big 4 boot, will be introduced, taking into account other models.
The machine is an opto-mechanical integration of precision equipment, including both light and electricity; both strong and weak; both analog and digital circuits. Introduced one by one below.
(A) Power The power supply of this machine is divided into two parts, low voltage power supply and high voltage power supply.
Low-voltage power supply: After 220V transformer, rectifier, filter, voltage regulator, the following voltage is output;
1. +5V, supply digital circuits and some Hall switches.
2.-5V, +15V, supply analog circuits and some Hall switches.
3. +24V, supply solenoid coil and acousto-optic drive source.
4.+60V, supply stepping motor for drag and traverse plate.
5.220V AC, used for low-speed servo motors and high-speed synchronous motors for dragging rollers.
High-voltage power supply only one way: +6000V, driving laser tube.
Power is a strong part of the power to the whole machine, if not normal, generally analog circuit failure, the common is the lack of one or several power supply, check out one by one in the following order:
Whether the box is pushed into place, fuses, double voltage rectifier diodes, filter capacitors, 78XX, 79XX transmission lines, etc. are normal. It must be specifically pointed out that after the positive output of the high-voltage power supply passes through five series-connected equivalent large resistors, the probability of damage is large. In addition, there are also two high-power series resistors inside the transverse plate cassette, sealed in a plastic tube, and are also vulnerable parts. Attention should be paid to the inspection.
(II) Drive control circuit board This circuit board is an important piece. Its circuit random type and RIP card are slightly different. The main functions are as follows:
* Control upper and lower pieces and roller positioning.
* Detect the negative pressure of the roller.
* Detect raster and line head signals, and send it to RIP card after processing.
* Accept the synchronization signal sent by the sync board and send a "ready" signal to the RIP card accordingly.
* Set protection and alarm for faults.
* The automatic/manual transfer switch and control keys of the automatic model are located on this board.
* Report 200Pa, 500Pa and "admittable" signals via LED.
Common fault analysis ideas:
1. The film full-page shift is generally the start signal or the first line signal disappears or does not reach the RIP card in time, and the start signal and the first line signal path should be checked, including the start bit head, the head head, and the corresponding Hall switch. , related to the chip (generally 74132 and 74221), line synchronization signal, 3487 interface.
2. Text misalignment of the entire line If the occasional misalignment of the entire text, often for power interference, should check the ground, otherwise it should be suspected that the head of the signal is unstable, need to focus on checking the first signal path, note that the path has been extended to 3487 interface.
3. Irregular text misplacing In addition to the exclusion of the reasons for the above 1 and 2, we should also check the grating signal path, including light-emitting diodes, LM318 op amp, 4046, 74161 counters and related circuits.
4. The vacuum value 220Pa, 500Pa is not normal so that it cannot be filmed.
First eliminate the outdoor fan factor and then check the common path of the two signals. General sensor is not easy to damage, check the chip 74132 and 7414.
5. Electromagnet operation is not normal or does not work First eliminate the mechanical factors, the general probability of damage to the electromagnet coil is minimal, it should focus on inspection of the corresponding Darlington drive and related circuits.
6. "Guided" indicator is off The raster processing circuit is abnormal. See Synchronous or phase-locked circuit.
(c) traverse control board The role of this board is:
* Control the scanning guide and the four-way laser information sent from the RIP card.
* Fast forwarding of transport carriages
First, the main structure and principle Hangzhou production photosetters outside the drum-based. The so-called outer drum is to attach the film to the outer cylindrical surface of the drum through the negative pressure generated by the air pumping pump. During operation, the film rotates with the drum at a high speed, and the laser source is fixed in a traverse mechanism that moves parallel to the drum axis. During operation, the text message sent by the publishing host is converted into a dot signal, the output waveform of the laser source is modulated, and the laser spot signal with or without laser is focused and then hit on the film. When the signal is exposed, the film is exposed. A black spot, transparent when there is no signal. After the end of the scan, a large number of light spots constitute a graphic information film.