AHA-7850 doesn't detect scanner anymore

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Hello,
my old "HP ScanJet IIc" used to work so perfectly but now the kernel can only 
see something at SCSI-ID 1, but is not able to detect the device properly :-(

These are the 'kernel.log' entries after I switched on 'options aic7xxx 
aic7xxx=verbose,periodic_otag' in modules.conf file :

| Jan 21 13:17:18 gbpc PCI: Enabling device 0000:00:0d.0 (0116 -> 0117)
| Jan 21 13:17:18 gbpc ACPI: PCI Interrupt 0000:00:0d.0[A] -> GSI 17 (level, 
low) -> IRQ 185
| Jan 21 13:17:18 gbpc ahc_pci:0:13:0: hardware scb 64 bytes; kernel scb 52 
bytes; ahc_dma 8 bytes
| Jan 21 13:17:18 gbpc ahc_pci:0:13:0: Host Adapter Bios disabled.  Using 
default SCSI device parameters
| Jan 21 13:17:18 gbpc scsi12 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, 
Rev 7.0
| Jan 21 13:17:18 gbpc <Adaptec 2902/04/10/15/20C/30C SCSI adapter>
| Jan 21 13:17:18 gbpc aic7850: Single Channel A, SCSI Id=7, 3/253 SCBs
| Jan 21 13:17:18 gbpc
| Jan 21 13:17:33 gbpc (scsi12:A:0:0): Saw Selection Timeout for SCB 0x3
| Jan 21 13:17:34 gbpc (scsi12:A:1:0): SCB 2: requests Check Status
| Jan 21 13:17:34 gbpc (scsi12:A:1:0): Handled Residual of 36 bytes
| Jan 21 13:17:34 gbpc (scsi12:A:1:0): Sending Sense
| Jan 21 13:17:34 gbpc (scsi12:A:1:0): Handled Residual of 36 bytes
| Jan 21 13:17:34 gbpc (scsi12:A:1:0): SCB 3: requests Check Status
| Jan 21 13:17:34 gbpc (scsi12:A:1:0): Handled Residual of 36 bytes
| Jan 21 13:17:34 gbpc (scsi12:A:1:0): Sending Sense
| Jan 21 13:17:34 gbpc (scsi12:A:1:0): Handled Residual of 36 bytes
| Jan 21 13:17:35 gbpc (scsi12:A:1:0): SCB 2: requests Check Status
| Jan 21 13:17:35 gbpc (scsi12:A:1:0): Handled Residual of 36 bytes
| Jan 21 13:17:35 gbpc (scsi12:A:1:0): Sending Sense
| Jan 21 13:17:35 gbpc (scsi12:A:1:0): Handled Residual of 36 bytes
| Jan 21 13:17:35 gbpc (scsi12:A:2:0): Saw Selection Timeout for SCB 0x3
| Jan 21 13:17:35 gbpc (scsi12:A:3:0): Saw Selection Timeout for SCB 0x2
| Jan 21 13:17:36 gbpc (scsi12:A:4:0): Saw Selection Timeout for SCB 0x3
| Jan 21 13:17:36 gbpc (scsi12:A:5:0): Saw Selection Timeout for SCB 0x2
| Jan 21 13:17:36 gbpc (scsi12:A:6:0): Saw Selection Timeout for SCB 0x3


The SCSI-terminator is properly attached to the scanner and the wires are okay 
as well. Is there a way to find-out more what actually causes the problem?

As I am not subscribed to the list, please when you answer, put my mail 
address to CC

Many thanks in advance,
Gerrit
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