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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
Parallel Timing Specification Changes
NOTE:
This information is also provided in Technical Service Bulletin 3210.
Firmware Revision 2.04 and above provides better compatibility between the Microline 393-Plus and
Microline 393C-Plus printers and high speed computers and / or non-DOS operating systems.
The firmware changes the parallel interface timing specification. The BUSY and ACKNOWLEDGE signals
are offset and reduced to eliminate potential noise and timing problems with these interface signals.
Firmware Revision 2.04 and above changes the printer menu. The feature, CPU Compensation, is added.
Two settings are available for this feature: Standard and Special.
· Standard
This is the default setting.
It allows the printer to work with high speed computers and / or non-DOS operating systems.
Use this setting from most applications.
· Special
Uses the "old" timing interface specifications.
The symptoms listed below are typical of a problem with the parallel interface timing.
· "Paper End" message on the computer screen
· Hesitation problems
· No printed data
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