Chapter Adjustment

4.1 ADJUSTMENT OVERVIEW 4-1

4.2 PRINTHEAD ADJUSTMENT VALUE WRITING 4-3

4.3 61-DIRECTIONAL PRINTING ADJUSTMENT 4-5

4.4 PARALLELISM ADJUSTMENT -4-8

4.5 TIMING BELT TENSION ADJUSTMENT ,4rlQ

4.6 MECHANISM ADJUSTMENT VALUE MEASUREMENT 4-11

LIST OF FIGURES

Figure 4-1. Entering the Adjustment Mode 4-3

Figure 4-2. Writing the Adjustment Value 4-4

Figure 4-3. BETA Value 4-5.

Figure 4-4. Bi-directional Printing Adjustment 4-6

Figure 4-5. Printing Pattern -4-7

Figure 4-6. Parallelism Adjustment Lever 4-8

Figure 4-7. Dial Gauge and Dial Gauge Base Attachment 4-9

Figure 4-8. Carriage Guide Shaft Pralleiism Adjustment 4-9

Figure 4-9. Carriage Timing Belt Tension Adjustment 4-10

Figure 4-10. Pull the Thickness Gauge 4-12

Figure 4-11. Mechanism Adjustment Value Measurement 4-13

LIST OF TABLES

Table 4-1. Required Adjustments -4-1.

Table 4-2. Tools 4-2

Table 4-3. Special Tools 4-2

4.1 ADJUSTMENT OVERVIEW

This section describes the adjustment procedures required for reassembling the DFX-8000. When disassembly or replacement is performed during maintenance or repair of the parts described in this section, the following adjustments should be performed to ensure proper operation.

Table 4-1. Required Adjustments

Table 4-1. Required Adjustments

Disassembly/Assem bly/Replacement Section No.

Adjustment Section No.

3.2.1 Printhead Exchange

4.2 PRINTHEAD ADJUSTMENT VALUE WRITING

3.2.4.2 Main Board Exchange

4.2 PRINTHEAD ADJUSTMENT VALUE WRITING

4.3 BI-DIRECTIONAL PRINTING ADJUSTMENT

3.2.6 Printer Mechanism Exchange

4.3 BI-DIRECTIONAL PRINTING ADJUSTMENT

3.2.7.9 Platen Removal

4.3 BI-DIRECTIONAL PRINTING ADJUSTMENT

4.4 PARALLELISM ADJUSTMENT

4.6 MECHANISM ADJUSTMENT VALUE MEASUREMENT

3.2.8.1 Platen Gap Sensor Exchange

3.2.8.1 Platen Gap Adjustment Motor Exchange

4.3 BI-DIRECTIONAL PRINTING ADJUSTMENT

4.4 PARALLELISM ADJUSTMENT

4.6 MECHANISM ADJUSTMENT VALUE MEASUREMENT

3.2.8.5 Carriage Motor Unit Removal

4.5 CARRIAGE TIMING BELT TENSION

ADJUSTMENT 4.3 BI-DIRECTIONAL PRINTING ADJUSTMENT

When adjusting this printer, the following tools are required.

Table 4-2. Tools

Designation

Type

Class

Part No.

#F518 Thickness gauge set

o

A

B776702201

#E668 Tension gauge (7000 g)

o

A

B777200301

Tension gauge (200 g)

o

A

B7651 14601

#E672 Dial gauge

E

A

B7651 11401

Dial gauge base

E

A

B7651 14501

O: Commercially available tool E: EPSON exclusive tool A: Mandatory B: Recommended

Table 4-3. Special Tools

No.

Name

Figure

Description

Part No

#E672

Dial Gage

• For parallelism adjustment

B765111401

#:F541

Dial Gauge Base

*

• For parallelism adjustment

B765114501

The purpose of this adjustment is to set the PG offset value in accordance with the nose dimension of the printhead. (For details, refer to Chapter 2.)

The offset for the nose dimension is represented by the adjustment value "ALPHA." The "ALPHA" value is stored in the memory on the main board, so the PG adjustment mechanism can read the value as needed. Be sure to perform the adjustment when required. If this adjustment is not performed correctly, the platen gap will be incorrect, the paper could be caught by a head pin, or, in the worst case, a head pin could break.

NOTE: The printhead adjustment value is written on the front of the head unit (refer to Figure 4-2). After the printhead is attached, the value cannot be seen. Be sure to write down the value before attaching the printhead.

Step 1: Connect the AC cable. Mount the ribbon cassette, and load paper into the front tractor. Step 2: Turn the printer power on while pressing the LINE FEED, MICRO FEED (V), and PAPER SELECT switches (Be sure that the top cover is closed. Do not open it until you turn the printer power off.), then wait until the buzzer rings five times.

PAPER SELECT

PAPER SELECT

Epson Stylus 870 Load Eject
Figure 4-1. Entering the Adjustment Mode

Step 3: Load the paper by pressing either the LINE FEED or PAPER SELECT switch, then wait until the PAPER OUT lamp goes off (approximately 15 seconds). Step 4: Press the ON LINE switch.

Step 5: Press the MICRO FEED (A) switch the number of times indicated by the value written on the front of the printhead.

• The buzzer rings each time the MICRO FEED switch is pressed.

• Press the MICRO FEED (A) switch to increment the value.

• Press the MICRO FEED (V) switch to decrement the value.

Step 6: To confirm the value stored, press the FORM FEED switch so that the value is printed.

• If the value is incorrect, return to Step 5. . When the value is correct, go to Step 7.

Figure 4-2. Writing the Adjustment Value

Step 7: Press the ON LINE switch and confirm that the buzzer rings five times. The printer prints the final value stored. If the value is correct, turn the printer power off.

The purpose of this adjustment is to correct the printer mechanism parameters which control bidirectional printing. Be sure to perform this adjustment when required. If this adjustment is not performed correctly, bidirectional printing may be misaligned, or, in the worst case, the carriage might operate incorrectly.

Before performing this adjustment, be sure that the following adjustments are completed correctly.

4.4 PARALLELISM ADJUSTMENT

4.5 TIMING BELT TENSION ADJUSTMENT

The parameters to be written to the memory on the main board in this adjustment are as follows:

Mechanism platen gap adjustment value (BETA)

Head platen gap offset value (ALPHA)

Head flying time adjustment value (FLYING TIME)

Acceleration/deceleration timing belt delay time adjustment values (BELT DLYs (1) to (4)) Bidirectional printing alignment value (Bl-D ADJUST)

For 1 and 2 above, use the factory-determined values. For 3 to 5, you should be execute the adjustment as described below.

Step 1: Mount the ribbon cartridge and load the paper (at either the front or rear tractor). Step 2: Turn the printer power on while pressing the LINE FEED, MICRO FEED (A), and FRONT/REAR switches. (Be sure that the top cover is closed. Do not open it until you turn the printer power of f.)

Step 3: Load the paper. (Press either the LINE FEED or FRONT/REAR switch.) Step 4: Write each parameter to the memory by following the flow chart shown in Figure 4-4. Step 5: After writing the parameters, turn the printer power off, then eject the paper and remove the ribbon cassette.

NOTES: 1. The range and units of each adjustment value are as follows: BETA : O to 150, 1 step

FLYING TIME : 280 to 460, 30 steps BELT DLY. : O to 6, 1 step 61-D ADJUST. : O to 48, 1 step 2. The ALPHA value is written on the printhead. (Refer to Figure 4-2.) The BETA value is written on the mechanism. (Refer to Figure 4-3.) To measure the BETA value, refer to Section 4.6.

Press the FORM FEED switch .( The BETA value is printed. )

Press the FORM FEED switch .( The ALPHA value is printed. )

Correct the BETA value. Press the MICRO FEED (A) switch to increment the value by+ 1. Press the MICRO feed .»switch to decrement tne value by -1. Press the TEAR OFF and MICRO FEED switches to increase the value b + 10.

Press the TEAR OFF and MICRO FEED switches to set the BETA value

Press the FORM FEED switch .( The ALPHA value is printed. )

Correct the ALPHA value. Press the MICRO FEED switch to increment the value by + 1. Press the MICRO FEED switch to decrement the value by -1._

Correct the ALPHA value. Press the MICRO FEED switch to increment the value by + 1. Press the MICRO FEED switch to decrement the value by -1._

Press the

FORM

FEED switch while

pressing

the ON

LINE switch,then

release

them.

Is the

paper

ejected?

Figure 4-4. Bi-directional Printing Adjustment

For the flying time, belt delay time (1 to 4), and Bi-D alignment values, select the combination which minimizes the misalignment as shown below.

To shift the characters on the even-numbered lines to the right or Ieft,relative to those on the odd-numbered lines, press either of the following switches.

- Press the TEAR OFF switch to shift the characters to the right.

- Press the LINE FEED switch to shift the characters to the left.

Misaligned Nozzle Epson
t'elt Dl y (4)« 000

Figure 4-5. Printing Pattern

Figure 4-5. Printing Pattern

The parallelism of the rear carriage guide shaft with respect to the platen must be correct. If the rear carriage guide shaft is not parallel to the platen, printing may be abnormal because the paper is not fed evenly at the left and right sides of the platen. A paper jam could occur. Perform this adjustment with the printer mechanism removed.

The parallelism is adjusted so that the difference between the distances (between the platen and carriage guide shaft) measured at the two positions shown in Figure 4-8 are within the specified range. Since the specified value (0.0 1 mm) is extremely small, adjustment is impossible using normal methods. Make sure to use the dial gauge and dial gauge base supplied by EPSON. Do not adjust the parallelism using any other method.

NOTE: Dial gauge base #F541 is exclusively for the DFX-8000. It cannot be used for the DFX-5000. Dial gauge base #E661 also cannot be used for the DFX-8000.

Step 1: Loosen (but do not remove) the two screws securing the parallelism adjust lever.

Figure 4-6. Parallelism Adjust Lever

Step 2:

Step 3:

Remove the printhead and ribbon mask, and attach the dial gauge base in the same way as attaching the printhead. Loosen the screw on the base and adjust the gauge mounting position so that the tip of the gauge (portion A in Figure 4-8) is securely attached to the platen and the needle registers on the scale. (Do not forget to tighten the screw again.)

Figure 4-7. Dial Gauge and Dial Gauge Base Attachment

Measure the distance between the left sides of the platen and carriage guide shaft, then the distance between the right sides, and compare.

70mm

70mm

Figure 4-8. Carriage Guide Shaft Parallelism Adjustment Step 4: If the distance measured at the left side is greater than that measured at the right side, move the parallelism adjust lever in the direction shown by the black arrow. If the distance measured at the left side is less than that measured at the right side, move the parallelism adjust lever in the direction shown by the white arrow. (Refer to Figure 4-6.)

Figure 4-8. Carriage Guide Shaft Parallelism Adjustment Step 4: If the distance measured at the left side is greater than that measured at the right side, move the parallelism adjust lever in the direction shown by the black arrow. If the distance measured at the left side is less than that measured at the right side, move the parallelism adjust lever in the direction shown by the white arrow. (Refer to Figure 4-6.)

NOTE: The carriage guide shaft moves as shown in Figure 4-8. For example, when the parallelism adjust lever is moved in thedirection shown by the black arrow, the distance between the left side of the platen and shaft narrows a little bit as the distance between the right sides is narrowed.

Step 5: Repeat Steps 3 and 4 until the difference between the distances measured at the two positions is within 0.01 mm. Step 6: When the difference is within the specified range, firmly tighten the two screws that secure parallelism adjust lever, and measure the distance again as described in Step 3. Step 7: When the difference between the measured distances is within the specified range, fix the two screws with screw lock. This completes the parallelism adjustment. (Refer to Chapter 6, Section 6.2 for lubrication and adhesive application.)

The carriage motor timing belt tension must be adjusted when any part of the arriage mechanism, such as the carriage, carriage motor, belt pulley, or timing belt, is disassembled. Perform this adjustmen with the upper case (and the printer mechanism) removed.

Before starting this adjustment, carefully fix the printer mechanism, because a force of 6.5 kg will be applied to it when the tension lever is pulled in the horizontal direction.

Step 1: Completely loosen the three tension adjustment screws (A in Figure 4-9) on the carriage motor unit. (Loosen but do not remove them.)

Step 2: Confirm that the timing belt is correctly attached and that no load is applied to it.

Step 3: Insert the tension gauge hook through the hole (B in Figure 4-9) in the tension lever.

Step 4: Pull the tension gauge horizontally (direction C in Figure 4-9) to apply a 6.5 Kg force.

Step 5: Move the belt left and right while pulling the tension gauge, and move the motor pulley a little bit.

Step 6: Tighten the three tension adjustment screws and fix them at the pulling force of 6.5 kg.

Step 7: Fix the three tension adjustment screws with screw lock. (Refer to Chapter 6, Section 6.2 for lubrication and adhesive application.)

Epson 1170 Spare Parts
Figure 4-9. Carriage Timing Belt Tension Adjustment

This section describes how to measure the parameter (BETA value) for the PG mechanism unit. Since the BETA value is unique to each mechanism unit, it is written on the label as shown in Figure 4-3, so that it can be confirmed at a glance. Be sure to perform this measurement and correct the value written on the label because the value is necessary when the other units (board, printhead) are changed (when 61-DIRECTIONAL PRINTING ALIGNMENT (Section 4.3) is executed).

• This measurement is important because it determines the platen gap, so be sure to use the exclusive thickness gauge set and tension gauge supplied by EPSON.

Thickness gauge set (0.57 mm) : #F518 (Part No. 6776702201) Tension gauge (200 gf) : #F545 (Part No. 676511 4601)

• This measurement cannot be executed for printers with ROM version BX2201. For those printers, first replace the ROM with a newer one (with a version later than BX2201).

• Do not turn the printer power off during Steps 3 to 16.

• When adjusting the platen gap to narrower or wider using the MICRO FEED (A) and MICRO FEED (V) switches, be sure to adjust the gap by 1 step at a time. If the gap is adjusted two or more steps at a time, the PG mechanism (PG motor) may not operate correctly. If this happens, perform the platen gap correction value adjust ment from the beginning.

Step

1:

Step

2:

Step

3:

Step

4:

Step

5:

Step

Step 9:

Remove the ribbon cartridge, then load the paper. Close the top cover.

Turn the printer power on while pressing the FORM FEED, MICRO FEED (A), and FRONT/REAR switches.

Wait a few seconds, then open the top cover.

Remove the printhead and the ribbon mask holder. (Refer to section 3.2. 1.)

Attach the printhead. When attaching the printhead, pull it frontward, then tighten the left screw first with a torque of 12 kg cm. (Refer to section 3.2. 1.)

Reset the ALPHA value by pressing the TEAR OFF and MICRO FEED switches simultaneously. Write the ALPHA value written on the printhead into the memory. (Refer to Figure 4-2.)

- Press the MICRO FEED (A) switch to increment the value by + 1.

- Press the MICRO FEED (V) switch to decrement the value by - 1.

Confirm the ALPHA value written to the memory by pressing the FORM FEED switch. (If the value written is incorrect, return to Step 8.)

- The buzzer rings each time the MICRO FEED switch is pressed Step 10: After writing the ALPHA value in the memory, press the ON LINE switch.

Step

12:

Step

13:

Step

Step 17:

Move the printhead manually so that the center of the printhead is aligned to the 15th column on the printer scale.

Measure the BETA value by following the flow chart shown in Figure 4-11. Remove the printhead. (Refer to section 3.2. 1.)

Attach the ribbon mask holder and the printhead. (When attaching the printhead, be sure to attach it as described in Step 6. Refer to section 3.2. 1.) Mount the ribbon cartridge, then close the top cover.

Perform Steps 3 to 5 in Section 4.3. At this time, skip the steps for writing the ALPHA and BETA values because these values have already been stored in the memory. Rewrite the BETA value on the mechanism unit product code No.label with the newly measured value. (Refer to Figure 4-3.)

Case 1. Previous value: 140 gf (150 - 10) Current value : 180 gf (150 + 30) The previous value is closer to 150 gf, so go to the "Previous" loop.

Case 2. Previous value;120gf (150 - 30) Current value : 160 gf (150 + 10) The current value is closer to 150 gf, so go to the "Current" loop.

Case 3. Previous value: 140 gf (150 - 10) Current value : 160 gf (150 + 10) In this case, we make it a rule to select the value which doesn't exceed 150 gf. Therefore, go to the "Previous" loop.

Thickness gauge Platen

Thickness gauge Platen

Tension gauge

Figure 4-10. Pull the Thickness Gauge

Tension gauge

Figure 4-10. Pull the Thickness Gauge

START

Reset the BETA value by pressing the MICRO switch while pressing the TEAR OFF switch.

FEED

(v)

Insert the exlusive thickness gauge (#5 18: total 0.57 mm) between the printhead and

0.5 + platen.

0.07,

Press the MICRO FEED switch while pressing the TEAR OFF switch. (Do not forget how many times you press the MICRO FEED(A) switch [X times ]. )

Move the thickness gauge to the left and right.

No

Reset the BETA value by pressing the MICRO FEED (v) switch while pressing the TEAR OFF switch.

Press the MICRO FEED (~)switch(X-1)times while pressing the TEAR OFF switch to position move the printhead to the position one step away from the where the printhead and the thickness gauge contact.

Press the MICRO FEED (~)switch(X-1)times while pressing the TEAR OFF switch to position move the printhead to the position one step away from the where the printhead and the thickness gauge contact.

Press the MICRO FEED (v) switch.

Figure 4-11.

Press the MICRO FEED (v) switch.

Figure 4-11.

Mechanism Adjustment Value Measurement

4-13

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Responses

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    8 years ago
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