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Service Guide OL400
Chapter 4 Failure & Repair Analysis
4.7
SELF-TESTS
4.7.01 General Information
The following diagnostics are available for the OL400 Printer.
Continuous Print Test
Print Fonts
Menu Print
Serial Interface Loop Test
Engine Test
4.7.02 Continuous Print Test
During the Continuous Print Test the OL400 will print a rolling ASCII character set. This test is
helpful in determining the relative print quality of an entire page.
4.7.03 Print Fonts
Although Print Fonts is not usually considered a diagnostic, it is quite useful in determining if the
OL400 is recognizing Font Cards and DLL Fonts.
4.7.04 Menu Print
Menu Print should be used to determine the status of the various Menu Items. This information is
stored in the EEPROM.
4.7.05 Serial Interface Loop Test
The Serial Interface Loop Test is used to determine the status of the RS232-C Serial Interface
Board. A loopback connector (as shown in the Solutions Manual) must be attached to the
interface connector before running this test.
4.7.06 Engine Test
The Engine Test allows the technician to operate the printer with the Main Controller Board,
Interface Board and Operator Panel detached. This can be very helpful when trying to isolate
defective circuit boards.
To perform the Engine Test, follow this procedure.
1. Remove the upper cover.
2. Detach the Operator Panel, Interface Board, RAM Expansion Board and Main
Controller Board.
3. Make sure that the paper cassette is installed.
4. Override the cover interlock switch.
5. Power ON the the printer while pressing Switch 1 on the Engine Controller
