the Main electronics Repair Computer equipment
Inkjet printer «HP DeskJet 3820»: design features, order of disassembly, repair
In previous issues of the magazine talks about the «younger» line of inkjet printers HP. This article will focus on one of the representatives of the «middle» of the group of pneumatic and jet controlling systems — HP DJ 3820. It will discuss the main technical characteristics of the printer, order of disassembly, and possible malfunctions and methods of their elimination.
print Technology. thermal inkjet drop-on-demand), precision — HP Photoret 111, HPColorSmart1 print Speed, p/min. to 6
color printing. to 4800/1200
(on special paper)
Compatible with the OS. Microsoft Windows (95, 98, NT 4.0,
2000 Professional, Me,
XP Home and Professional), Mac OS version 8.6 or later, OS X RAM, MB. 2
print. enhanced HP PCL
level 3 External
the CENTRONICS port, and a Universal Serial Bus (USB) — compatible with IEEE 1284 Recommended print volume, p/month. 1000
voltage 100…220 V, 50/60 Hz power consumption, watts:
in the off state. 2;
in the waiting state. 4;
in the print mode. 25
acoustic noise, dB. 46
dimensions (HxWxD), mm Hg
thus, we examined the main characteristics of the printer. At low cost and supplies cost per page is very low. The print quality is quite high, although it is not classified as photo printers. The printer can work with many operating systems. It can also be used in conjunction with the print server to work with multiple computers — his speed and resource sufficient for this purpose.
the Procedure for disassembly and design features printer
the Procedures for removing the printer frame For disassembly and Assembly printer will need a screwdriver «snowflake» T9 and flat No. 1.
the Body of the printer is removed in the following sequence.
Open the top cover, Unscrew the two screws (Fig. 1). Next, as shown in Fig. 2, press the latch, while slightly lift the left corner of the lining. Then perform similar actions on the right side (Fig. 3). When removing the housing on the right would interfere with the Parking site and the carriage (if it is), so, if possible, first remove the carriage in the middle. Then, raise the body and put it on the right side of the printer to cut the wiring harness from the control panel. The inner side of the cladding will be visible to the latch Board to the control panel (Fig. 4). Press the latch and remove the card.
the appearance of the printer after removing the plastic cladding is shown in Fig. 5. The numbers on it shows the following main units: 1 — a drive mechanism of the carriage; 2 — the feeder and transport of the paper; 3 — the Parking mechanism of the carriage and cleaning cartridges; 4 — a power supply; 5 — the main electronic Board; 6 — the trays and the reception of the paper. Then remove the decorative overlay (Fig. 6).
For further disassembly will require disconnection of connectors and loop are shown by numbers in Fig. 7:
1 — output connector PSU; 2 — the plume from the printhead; 3-external interface connection — distributors; 4 — the connector on the engine when the water carriage; 5 — connector 220V power supply (it should be removed, pre-drawn two latches). Removing the drive mechanism of the carriage
Unscrew the five screws as shown in Fig. 8. Grasp the edge of the drive mechanism of the carriage, first take away the bottom part of the movement itself up, and then removed (Fig. 9).
Removing the main PCB
Unscrew the three screws as shown in Fig. 10. The lower part of the card inserted in the ears metal base. The main electronic Board little adapted for component repair, but if necessary it is possible to replace individual components (elements, power supply and connectors).
In Fig. 11 the numbers show the location of some nodes on the Board:
1 — an optical sensor top cover is closed; 2 — an optical sensor front edge of the paper; 3 — pulse stabilizer Pete of circuits and circuit elements of the power management; 4 — connector LPT port; 5 — connector USB port; 6 — managing microcontrol — ler, memory, and other (under the metal screen).
removing the power supply unit
Unscrew the screw (Fig. 12). Press the latch (Fig. 13), the shift unit movement to the right and shoot it. To retrieve the electronic Board from the enclosure and PSU press the latch (Fig. 14) and remove the card from its slot. Repair PSU is not a problem because most of the components in its composition are available.
Removing the coordinate tape
Click on the flat spring and gently remove her from the end coordinate of the tape (Fig. 15). The opposite end of the tape is removed from the tooth base.
Removing the carriage axle
a Flat-head screwdriver (Fig. 16) unbend the metal latch up until it is released from the slots of the base. Then shift it up and pull the axle. Together with the above elements will be removed by a flat spring tension coordinate tape.
removing the timing belt drive carriage
Press the spring-loaded roller (Fig. 17) to relieve belt tension. Then remove the belt from the engine gear. The carriage will be released and the reason it will only link train.
the removal of the train carriage
Free train just enough — compressed laterally (along with the gasket) and it will come out of the slots (Fig. 18). Node carriage completely removed.
the Removal of the engine drive carriage
Unscrew the two screws from the bottom (Fig. 19) and remove the engine.
based On the carriage using the five screws fixed fee management nozzles of the cartridge (Fig. 20). To remove the screw 4, it is necessary to remove the train 1, the pre-Ottepel the clamp 2. Remove card very carefully upwards, in order not to lose the small springs with aluminum brackets fixing cartridges. Then separated from the fixation belt 3 to the base of the carriage. Appearance fees shown in Fig. 21 and 22, where:
1 — an optical position sensor carriage (Fig. 21); 2 — a pulsed voltage Converter to power the Board elements; 3 — the controllers control dusa — mi cartridges; 4 — the contact group for connect — ing cartridges (Fig. 22).
Site Parking carriage and cleaning cartridges
Unscrew the three screws indicated by the red arrows in Fig. 23. After loosening the screws will release the clamp 1 — it should be removed, in order not to lose.
Click on the tab at the bottom of the printer (Fig. 24) and remove the node upwards to the right. It should be borne in mind that site Parking is contaminated with dried ink, so be careful to handle them — the ink is badly washed with hands. Then a flat blade screwdriver to press the two latches (Fig. 25). After this, remove the upper part, the movable part 1 with ground suckers and squeegee (Fig. 26) and the drive roller 2. At the bottom of the base of the site lies the porous material 3 which absorbs the ink.
the rotation of the roller is provided from the main drive of the transport of the paper during its rotation in the idle mode in either direction). Switching the direction of the site provides a centrifugal clutch, which is located directly on the body
node. To access it, Unscrew the three screws securing the cover of the gearbox (figure 27). Under the hood will be seen by the following elements (Fig. 28):
1 — a centrifugal clutch; 2 — the drive gear.
All gear can be easily removed with axes. Figure 29 shows the gear, which directly drives the roller rolling part of the node.
article Summary: hp (hewlett packard)