Apple Color OneScanner Troubleshooting Guide
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Apple serviced the Apple Color OneScanner by swapping modules: lamp, optical assembly, logic board, power supply board, transformer, carrier motor and belt. Its Service Source chapters give a power-on LED error code table and symptom charts for each revision, with cures listed most likely first. If a module swap does not cure the fault, refit the original before trying the next cure.[1][2] Neither chapter has a schematic or component values.
Power-on LED error codes
[edit | edit source]At power-on the scanner tests itself and reports a failure by flashing its error light.[1][2]
| Flashes | Revision A | Revision B |
|---|---|---|
| One | Check whether the lamp light is green (wrong, 8-bit lamp) or white; replace the lamp if green; replace the logic board; replace the power supply; replace the power supply cable | Replace the logic board |
| Two (lamp) | Clean the glass cover assembly; check the lamp holder connector; check that the lamp's label faces down into the holder; replace the lamp; replace the optical assembly | |
| Three | Check the carrier motor assembly, drive belt, gears and pulleys, limit switch, home position switch, and that the carrier shaft is not bent | |
| None, but images are wrong | Replace the optical assembly | |
Apple's Tech Info Library adds that for the two-flash error a vendor examined a scanner and 20 optical assemblies and found the optical assembly can be at fault even when a new lamp and logic board do not cure it.[3]
Symptom charts
[edit | edit source]| Symptom | Cures, most likely first |
|---|---|
| Power lamp not on; scanner dead | Plug in the power cord; close the lamp cover and turn the button clockwise; check the voltage selector (international models, Revision A); check the interlock switch with a meter and replace it if it does not open and close; check the power supply fuses (FU1-FU3 on Revision A, FU1 on Revision B); replace the logic board; replace the power supply; replace the transformer (Revision A) |
| Optical assembly does not move | Check the SCSI connection and SCSI ID; check, clean or replace the belt; check the belt is tight with no slack; check the gears for damage or debris |
| Optical assembly moves once, then stops | Check the limit switch for continuity; check the drive belt and pulleys; check the carrier motor |
| Scanning program crashes or the computer hangs | Check the scanning application and driver versions and that the driver is present; check the SCSI connection, ID and termination; check the computer has enough memory and System 7.0 or later; switch the scanner on and restart the computer; replace the logic board |
| Lamp will not light or is dim | Check the lamp holder connector and that the lamp label faces down; replace the lamp; replace the flexible cable (Revision A); replace the optical assembly; replace the logic board |
| Scan command does nothing | Check the external cables; set the scanner's SCSI select switch to an unused ID (factory setting 2; do not use 7, 8, 9 or 0); check SCSI termination; check the logic board fuse (Revision A); replace the logic board |
| Dark or light spots | Clean the glass with water and a soft lint-free cloth; adjust contrast or threshold in the application; replace the lamp; replace the optical assembly; replace the logic board |
| Scan runs but the image does not reach the computer | Check the interface connector; replace the optical assembly; check fuse FU1 on the logic board; replace the logic board |
| Wrong image on screen | Clean the glass; replace the optical assembly |
Source: Service Source symptom charts.[1][2]
Other notes
[edit | edit source]- The scan-in-progress light that the manual describes worked only on early units. A dark light during scanning is not a fault.[4]
- The lamp lock button operates the interlock switches. If the scanner is dead after lamp work, check that the button is tight before suspecting the power supply; Apple's chart for a dead scanner lists it second, after the power cord.[1]
- Where the lamp casts a green light, it is the grey-scale OneScanner's 8-bit lamp, not the colour lamp. See Apple Color OneScanner General Maintenance.[1]
Related pages
[edit | edit source]- Apple Color OneScanner
- Apple Color OneScanner General Maintenance
- Apple Scanner Troubleshooting Guide
References
[edit | edit source]- ↑ 1.0 1.1 1.2 1.3 1.4 Apple Computer, Service Source: Color OneScanner (Revision A scanner), PDF dated November 1995, from the Service Source 2.5 CD of 1997. Hosted as File:Apple Color OneScanner Service Source (1995).pdf. Basics PDF pp. 3-4; Specifications pp. 6-9; Troubleshooting pp. 11-19 (lamp versions, LED error messages, miscellaneous symptom charts); Take Apart pp. 21-61; Additional Procedures pp. 63-74 (voltage selection, power supply fuses, lamp replacement, voltage conversion); Exploded View p. 76.
- ↑ 2.0 2.1 2.2 Apple Computer, Service Source: Color OneScanner/B (Revision B scanner), PDF dated January 1996, from the Service Source 2.5 CD of 1997. Hosted as File:Apple Color OneScanner B Service Source (1996).pdf. Specifications PDF pp. 3-6; Troubleshooting pp. 8-14; Take Apart pp. 16-54 (including scan start board and lid hinge); Additional Procedures pp. 56-61 (power supply fuse FU1, lamp replacement); Exploded View p. 63.
- ↑ Apple Computer, Tech Info Library article 13785, "Apple Color OneScanner: LED Error Flashes Twice", created 26 October 1993. Copy at absurdengineering.org. The two-flash LED lamp error can be caused by the optical assembly when a new lamp and logic board do not cure it; clean the glass, check the lamp holder and lamp orientation, replace the lamp, then the optical assembly.
- ↑ Apple Computer, Tech Info Library article 15052, "Apple OneScanner: Scan-in-progress LED Doesn't Function", created 4 April 1994. Copy at absurdengineering.org. The scan-in-progress LED described in the Color OneScanner and OneScanner manuals operated only on early units; it has no function on later units and does not indicate a fault.