Polaroid SprintScan SS35, Repair Manual

Page: 129 / 187

Slide Scanner Repair Manual Diagnostics and Troubleshooting
129
IPT Scanner Tests - Understanding Test Results
Initialization Test
The LabVIEW test cycle begins by checking scanner configuration and circuit operation. This
portion of the test is done before the Distortion and Magnification tests. Failure of any of the
initialization tests results in an abort of the test in progress and repairs must be made before
continuing with the image performance tests. On-screen error messages appearing in
standard Macintosh type dialog boxes tell the operator which portion of the test fails. Table 5-7
interprets the results of the Initialization Test.
Table 5-7. Interpreting Results Provided by the Initialization Tests
Test Specification Suggested Repair
SS35 ES & Plus
Initialization Test None • Wrong SCSI ID selected - change to
ID 6. (An application such as SCSI
Probe can be used to see if the host
computer is receiving the correct
SCSI ID number.)
• SCSI cable defective.
• Cold solder joints in path from SCSI
connector to SCSI IC.
• SCSI ID switch defective or, if
SS35 Plus switch is not connected.
Note: Suggest use of SCSI Tester
Board P/N AA2907A to
isolate the problem.
(SS35 Plus only.)
IPT Digital Test None Replace Controller PC Board.
Distortion & Mag Test
The GMT Origin routine checks for the angle and position of the GMT target’s origin. There is
no test or limit associated with this check, but it is a means of tracking alignment problems.
GMT reference finding is done only once per Scanner Serial Number. It is assumed that for a
specific slide scanner, the GMT target always ends up in the same location because of the
precise holder/target system. This assumes that the GMT target is not removed.
The Distortion test looks at two (2) known vertical distances on the GMT target that are
parallel to the CCD sensor. If the ratio of the distances is greater than 0.5%, an error is
reported. The horizontal magnification test looks at the dimensions of a 6mm square. If the