Sharp AR-651 Service Handbook page 78

(c) Reproduction ratio adjustment of the secondary scanning direction (fine adjustment of transfer belt
motor rotation speed)
1. Turn ON the power while the digital keys [0] and [5] are pressed simultaneously. (Adjustment
mode)
2. Press [1] and then [ENERGY SAVER]. (A grid pattern is printed out. Use A3/LD in the 2nd cassette.)
3. Measure the distance C from the 5th line at the leading edge of the paper to the 25th line of the grid
pattern.
4. Check if the distance C is within the range of 200 ± 0.5 mm.
5. If not, change the value taking the following procedure and measure the distance C again.
<Procedure> (Adjustment mode) (Enter the code [488] 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 C becomes (0.5 mm/4 steps).
(d) Image position adjustment of the secondary scanning direction (the adjustment of the laser writing
start position/PRT)
This adjustment has to be performed for each paper source.
The following table shows the order of the paper source to be adjusted, code, paper size and
acceptable values.
Order for
adjustment
1
2
3 3rd cassette or tandem LCF
4
5
6
7
1. Turn ON the power while the digital keys [0] and [5] are pressed simultaneously. (Adjustment
mode)
2. Press [1] ([3] for duplexing) [ENERGY SAVER]. (A grid pattern is printed out.)
3. Measure the distance D from the leading edge of the paper to the 5th line of the grid pattern.
* At the duplexing, measure it on the top side.
4. Check if the distance D is within the range of 52 ± 0.5 mm.
5. If not, change the value taking the following procedure and measure the distance D again.
AR-651/810 ADJUSTMENT
Paper source Code
2nd cassette 440
1st cassette 439
441
External LCF 443
4th cassette 444
Bypass feed 442
Duplexing 445
Paper Acceptable
size value
A3/LD 0 to 15
A4/LT 0 to 40
A4/LT 0 to 15
A4/LT 0 to 15
A4 0 to 15
A4/LT 0 to 15
A3/LD 0 to 15
3 - 8
Remarks
Paper fed from the 2nd cassette