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TROUBLESHOOTING PROCEDURES
14-7
MFC 4450/OP-US-5.0
Maintenance
Bi-Directional Parallel Ports (nibble and byte modes)
The MFC 4450 supports both nibble (AT) and byte (Bi-Directional) mode parallel
ports. If your PC supports byte mode, scanning and fax reception will be at a faster
speed. To verify or change the parallel port mode, please check your system BIOS in
the CMOS Setup or
contact your computer manufacturer for assistance
.
NOTE: Some older PC models support only nibble mode. Generally, newer models
support both nibble and byte modes.
MFC Connect Failure or Bi-Directional Communication Error
Recently, some printers have included a function to show the printer status on the
PC display. Such printers use the bi-directional communication parallel port
between the printer and the PC. Our MFC 4450 also has a bi-directional parallel port
function. Since Windows
®
3.xx does not support bi-directional communication on the
parallel port, each peripheral vendor has developed and supplies their own bi-
directional device driver which will be installed into Windows
®
3.xx. If you install two
or more different bi-directional device drivers into Windows
®
, they might conflict with
each other and cause some problems.
Please make sure you have installed the MFC 4450 driver by executing SETUP.EXE
from your disk drive, as instructed on the Disk 1 label. The bi-directional communication
may be disable when the driver is installed from Add menu in “Printers” of Control
Panel please restart Windows
®
.
Remove the conflicting situation caused by one of the following printer drivers.
Review the following sections that apply to any additional printer drivers you may
have installed into your Windows
®
software.
Brother HL-6/6V/10h/630series/660series/960/1260/WL-660
HP LaserJet series II, IID, IIP, IIP+, III, IIID,IIIP or IV Plus
NEC SuperScript 610/660
EPSON ActionLaser 1100/1400
LexMark WinWriter 200
Brother HL-6/6V/10h/630series/660series/960/1260/WL-660:
The Resource Manager for MFC 4450 may not work if the printer driver for the above
models are installed after the installation of the MFC 4450 printer driver.
In this case, please install the MFC 4450 printer driver again or copy BI-DI.386 from
Disk 1 to the Windows
®
/System directory. (NOTE: BI-DI.386 on Disk 1 is not
compressed.)
HP LaserJet series II, IID, IIP, IIP+, III, IIID or IIIP:
If Microsoft Windows
®
Printing System for above models are used, you have to modify
the “win.ini” file which is in the Windows
®
directory to turn the printer's bi-directional
function off.
We recommend you to have back-up before you modify the WIN.INI or SYSTEM.INI,
just in case.