How to test and adjust
1 • Fit a terminator to one SCSI connector on the scanner and SCSI
cable and RS 232 service cable to the scanner and PC.
2 • Set the Dip switch to 8, (on).
3 • Turn on the Mac or PC and access the service program main menu
(section 3•5).
4 • Perform a focus calibration (Section 5•4) close to the zero point.
5 • Mount the UGRA test target firmly onto the drum approximately 1
cm away from the zero point (first position, fig. 1).
6 • Perform a sharpness/focus test (section 5•11 steps 5-15).
7 • Move the UGRA test target to the opposite end of the drum
approximately 16 cm away from the zero position (position 2, fig.
1) and repeat the sharpness/focus test (section 5•11 steps 5-15).
8 • The drum is in alignment when the pixel spread at 6µ is consider-
ed to be the same in positions 1 and 2. If the pixel spread is incor-
rect, proceed with step 9 below.
9 • Mount a ScanView focus adjust target at each end of the drum as
shown in Fig. 2 (the same dimensions away from the zero point as
the UGRA test target).
10 • Perform a focus test on the left hand test target (section 5•10 steps
11-16) and note the overlap values.
11 • Perform a focus test on the right hand test target (again in accord-
ance with section 5•10 steps 11-16) and compare the overlap val-
ues obtained in step 10 above. If the values are not the same, pro-
ceed with step 12.
12 • Remove the right hand end plate C and right hand drum cover D,
(section 4•2 steps 3 and 4).
13 • Remove the two DC motor covers, (section 4•15, steps 4 and 6).
14 • Remove the set screw B and adjust the mounting/adjustment allen
screw A (fig. 3) until the overlap values in step 11 are the same as
those in step 10.
15 • Repeat step 10 to ensure that the overlap values are the same on
both test targets. (After adjusting to the right hand target, it is like-
ly that the left has changed slightly).
16 • It may be necessary to repeat the adjustment on both test targets
several times until the overlap values are equal.
17 • Carry out steps 19-21 of section 5•3, (Focus) and if not within the
required tolerances, carry out steps 10-21 of section 5•3.
18 • Refit the two motor covers, (section 4•15, step 19).
19 • If no further adjustment or replacement operations are required,
refit the covers removed in step 1 in accordance with section 4•2.
Service Manual • ScanMate 4000/5000 Edition 1 • January 1996
Drum Alignment
5•9b
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