Printer Related Adjustment - Sharp AR-651 Service Handbook

3. 3. 3. Printer related adjustment

(a) Reproduction ratio adjustment of the primary scanning direction (fine adjustment of polygonal motor
rotation speed/PRT)
1. Turn ON the power while the digital keys [0] and [5] are pressed simultaneously.
2. Press [1] and [ENERGY SAVER]. (A grid pattern of 10 mm squares is printed out: Use A3/LD in the 2nd
cassette.)
3. Measure the distance A from the first grid line to the 21st of the grid pattern.
4. Check if the distance A is within 200 ± 0.5 mm or not.
5. If not, change the value taking the following procedure, and measure the distance A again.
<Procedure> (Adjustment mode) (Enter the code [401] with the digital keys) [START]
(Enter a value (acceptable values: 0 to 255) with the digital keys)
Press the [SET] or the [INTERRUPT] key to store the value in the RAM
"100% A" is displayed. Press [1] [ENERGY SAVER] (A grid pattern is printed out)
*The larger the adjustment value, the longer the distance A becomes
(approx. 0.5 mm/5 steps).
(b) Image position adjustment of the primary scaning direction (the adjustment of the laser writing start
position/PRT)
1. Turn ON the power while the digital keys [0] and [5] are pressed simultaneously. (Adjustment mode)
2. Press [1] [ENERGY SAVER] (A grid pattern is printed out: Use A3/LD in the 2nd cassette.)
3. Measure the distance B from the front edge of the paper to the 6th line of the grid pattern.
4. Check if the distance B is in the range of 52 ± 0.5 mm.
5. If not, change the value taking the following procedure and measure the distance B again.
<Procedure> (Adjustment mode) (Enter the code [411] with the digital keys) Press [START]
(Enter a value (acceptable values: 0 to 255) with the digital keys)
Press the [SET] or the [INTERRUPT] key to store the value in the RAM.
"100% A" is displayed.
Press [1] [ENERGY SAVER] (A grid pattern is printed out.)
*The larger the adjustment value, the longer the distance B becomes
(approx. 0.5 mm/10 steps).
6. After the adjustment for the code 411 is completed, apply the same adjustment value for the code 410.
<Procedure> (Adjustment mode) (Enter the code [410] with the digital keys) Press [START]
(Enter the same value entered in the step 5 above with the digital keys)
Press the [SET] or the [INTERRUPT] key to store the value in the RAM.
Note: The first line of the grid pattern is occasionally not printed out.
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(Adjustment mode)
AR-651/810 ADJUSTMENT