EPSON C4X series printer maintenance

Printer connected to the mains, press the printer's power button when the green indicator light does not shine, the printer does not work, press the key for the red ink light is not bright, it could be the printer's power supply broke down.

The first step to take off the printer's plastic cover. Off-white plastic cover with plastic buckle 7 is connected with a gray base with a screwdriver to push up one by one plastic button, you can take off the plastic cover and then remove the paper into the frame. Connected to electricity, with a multimeter to check the availability of CN2 on the 36 V voltage , shown in Figure 2, if no voltage,
disconnect the power after the CN2 in the power line, and then test 36 V power supply line (blue line and power supply boxes of metal in between) with or without 36 V voltage. If no voltage, the fault in the printer circuit board. Disconnect the power, the power supply box from the printer, remove the bottom left. Check F1 fuse is intact, if F1 blows, usually 300 V power supply fault, should first identify the trouble spots and then replace the fuse. Short-circuit fault may be the C11, Q1, C1, C15, D11 ~ D14 breakdown . If C1, C11, C15 breakdown, replaceable components and power fuse try again later. If the Q1 or D11 ~ D14 in diode breakdown, it should first find out what causes Q1 or diode damage. The reason may be the 36 V power supply or other components are damaged, replace the fuse after fault found then power tests, under normal circumstances, 300 V power supply should have, at this time and then check whether the C51 on the 36 V voltage. If no voltage output, the circuit may not oscillate, to see whether ZD4 voltage of about 10V, D2, D1, D3, C12 is damaged, C13, R11 is deterioration or open circuit, or a regulator circuit or the protection circuit fault. Temporarily to R69, R92 do not disconnect, so regulators have lost function and protection circuits, and then whether the voltage on the power test C51. If there is no short circuit within T1, C51 on there will be a voltage (due to no voltage regulator, C51 at relatively high voltage to prevent damage to components, the testing time should be as short as possible).

Next connect R92, recovery regulator circuit . If PC2, Q3I, C1 and other components intact, voltage regulator should be able to work, this time in 36 V power supply is connected to a 5W hundreds of Europe's resistance as the load , if the output voltage is relatively stable, indicating power supply has been basically normal and then connected to the R69, the protection circuit restoration, if the 36 V power supply is still no voltage output, check what part of town with fault protection circuit, short circuit R68 can try, if after the 36 V with the output short circuit, the fault in the Q82, Q83 and R83, C83 on. If the short circuit is still no voltage output after R68, the fault lies in the Pcl, Q31 and C1, the only double-check, failure is not difficult to solve. If the 36 V can be regulated, but the high voltage can be R92 on the parallel resistance (shunt resistance 47 ~ 10OkΩ) to reduce the output voltage. If the voltage is low, may be in the R93 resistor in parallel to increase voltage.

The third step is dismantling the right print head

1. Remove the print head: Remove the printer cover, the careful observation of the print head to the right, will find a clamp, with one hand before the light Hold the print head position, the other hand a small screwdriver with a flat mouth pry the clamp light, This time the print head will feel right before the store moved out a bit.

The print head and connecting cable, cartridge chip monitor cable pulled out from the socket Department will print head connection cable from the circuit board slot and slowly pull out; this time can also In the white cable below the print head on the left to see the other clamp, the same small screwdriver pry clamp light, then you can hand the print head position before and after the separate warehouse. At this time the print head has also been taken from the track down.

However, also need to rack from the word vehicle traction motor gear on the right picked, with the squares on the gear oblique mouth screwdriver between the upper and the rack, move to the right rack, you can rotate through the gears from the rack Gear check is coming!

2. Decomposition of the print head: Remove the print head in, just hold it with both hands before and after the print head position, horizontal force to the opposite direction, you can easily print head decomposition opened.