Platen/Head Gap Adjustment; Bi-Directional Printing Shift Adjustment - Sharp UP-600 Service Manual

(3) Adjustment
Adjust the print speed adjustment VR on the
solder side of the main PCB assembly until cycle
A falls within the range shown below.
Value of A Adjustment procedure
When A is out of range: Perform
601m-733ms
adjustment by turning the VR.
Print speed
adjustment VR
Main PCB assembly

3-4-2 Platen/Head Gap Adjustment

(1) Procedure
1. Remove the 2-station housing cover.
2. Loosen the two fastening screws of the PF
housing platen assembly.
(2) Adjustment
Use a thickness gauge to measure the gap between
the head assembly and the platen assembly.
Adjust the two adjustment screws (M3x10 hex
socket screws) on the rear until the gap is within
the range shown below.
Gap Adjustment procedure
When gap is out of range:
0.5 - 0.55 mm
Adjust the gap by turning two
adjustment screws on rear.
Note 1. Adjust the gap in three locations (right,
left, center).
2. Retighten the loosened screws.
Validation sensor
adjustment VR

3-4-3 Bi-directional Printing Shift Adjustment

(1) Procedure
Perform bidirectional printing. Judge the results
and rotate the motor shaft while holding the
timing disc stationary, until there is no printing
shift.
(2) Adjustment
Hold the timing disc stationary with a flat object
(such as the grip of a pincette). Grasp the motor
shaft with a pair of radio pliers and rotate the shaft
in the direction as indicated in the table below.
Print condition
24
Adjustment procedure
Rotate shaft in clockwise
direction until shift is
within 1 dot.
Rotate shaft in
counterclockwise
direction until shift is
within 1 dot.