Craden DP9 User Manual download pdf (Page 7)

5.4.2 Carriage Drive Belt Tension

The carriage belt connects the carriage drive motor to the carriage. Incorrect carriage belt

tension can cause uneven character width and spacing, poor bi-directional print alignment,

stalling and premature belt wear. Tension is adjusted with the screw fastening the carriage belt

idler pulley bracket to the right box flange.

1. Loosen the adjustment screw until the upper belt run can be pushed down against the lower

belt run at the center of the printer with about 1 lb. (400g) of force.

2.a. Procedure for firmware „E9' and earlier (see 3.7)

Use 955 FUNCT to print 4 lines of H‟s. Increase the belt tension by turning the adjustment

screw 1/2 turn clockwise and press ENTER to print 4 more lines. Adjust belt tension and

print as required. Select the loosest belt tension that gives good alignment of characters.

If no setting gives good alignment, adjust the CAR ALIGN parameter (see 5.2) and then

repeat this procedure.

b. Procedure for printers with firmware „EA‟ and later (see 3.7)

Use 943 function to print 6 lines of double-high double-wide zeros and select the best line

of aligned characters. If none are desirable, increase the belt tension by turning the

adjustment screw 1/2 turn clockwise and print using 943 FUNCT again. Select the loosest

belt tension that gives good alignment of zeros. Press 94 FUNCT and ENTER 4 times.

The display will read “CAR. ALIGN =” Use A or B to enter the value printed at the end

of the selected line of printed zeros.

5.4.3 Document Drive Belt Tension

The document drive belt connects the document motor to the rear document roller. Incorrect

document belt tension causes uneven line spacing and document drive stalling.

1. Use a spring gauge to deflect the center of the document drive belt. Adjust only if an 8 oz.

(225 gm.) force deflects the belt less than 0.02” (0.5 mm) or more than 0.04” (1 mm).

2. Loosen the 4 screws that fasten the document drive motor.

3. Move the motor toward or away from the rear document drive roller to adjust the tension

and tighten the screws. Repeat step 1.

5.4.4 Carriage Shaft Cam and Shaft Rack

The carriage shaft cam sets the carriage shaft height so that the gap wheel rises very slightly

when the carriage moves onto the right platen end. Light printing can occur if the carriage

shaft is too high. Document snagging or irregular movement of wide documents can occur if

the shaft is too low.

1. Move the carriage to the printer center and raise the carriage while holding the box down.

2. If both carriage shaft ends don‟t touch the top of the slots in the box flanges, reposition the

shaft by pushing the higher shaft end down while raising the lower shaft end.

3. Check that the rubber wheel is in firm contact with the platen when the carriage is at the left

and right platen ends.

4. Check that the carriage rises about 0.010 (0.25mm) as the carriage moves from its

rightmost position onto the right platen end.

5. If this does not occur, loosen the shaft cam screw on the right box flange and rotate the

cam. Hold the cam with a small screwdriver blade in the rectangular slot when tightening

the screw to stop the cam from rotating.

6. Do a test print to insure that print darkness does not vary between the left and right sides.

5.4.5 Rear Document Roller Spring Force

The rear document roller springs are formed wires that pull the rear upper document rollers

against the lower rollers. The springs are adjusted by raising or lowering the cams mounted on

the front screws fastening the side plates to the platen. Incorrect spring force can cause

document skewing, slipping or stalling.

Back to Table of Contents

1 2 3 4 5 6 7 8 9 10 11 12 ... 16 17

Comments to this Manuals

No comments

Craden DP9 User Manual Page 7

Comments to this Manuals

Related products and manuals for Print & Scan Craden DP9