OSR
OKIDATA ML-520
Printing method . . . . . . 9-pin, impact, dot matrix
Carriage width . . . . . . . 8.0 inches
Paper . . . . . . . . . . . . . . . 3" - 10", 12 - 24 lb., up to 5-part
Print head life . . . . . . . . 200 million characters
Ribbon life . . . . . . . . . . . 4 million characters
Form thickness . . . . . . . Automatic adjust
Print speed @ 10 cpi . . 427 cps HSD, 320 cps utility, 80 cps NLQ
Emulation . . . . . . . . . . . Epson FX, IBM Pro, Microline
Interface. . . . . . . . . . . . . CENTRONICS (standard), RS-232C (opt.)
Receive buffer. . . . . . . . 64K
Fonts . . . . . . . . . . . . . . . NLQ Courier, Gothic Utility Gothic,
HSD Gothic, bar code Code 39, UPC A,
UPC E, EAN 8, EAN 13, Interleaved 2 of
5, Code 128, POSTNET
Options . . . . . . . . . . . . . Single-bin cut sheet feeder, push tractor
(bottom feed), pull tractor (top mount)
Control Panel
SEL
EXIT GROUP ITEM SET PRINT
POWER ALARM MENU
SEL LF FF/LOAD TEAR P ARK QUIET
MENU SHIFT DOWN UP TOF
PRINT QUALITY
HSD UTILITY NLQ
CHARACTER PITCH
10 12 15
17 20 PROP
RESET
SEL light - On indicates that the printer is online. Off indicates that
the printer is offline. Flashing indicates print suppress condition and
the printer ignores all data until the condition is cleared.
ALARM light - On continuously indicates paper out. Flashing
indicates a hardware fault.
QUIET light - On indicates quiet mode has been enabled.
POWER light - On indicates that power is turned on.
MENU light - On continuously indicates the menu mode has been
entered. Flashing indicates a thermal condition on the print head.
There are also LED indicators for print quality and cpi selections.
Some operator keys are dual-function keys. In the normal operating
mode, the keys perform the functions of the labels at the tops of the
keys. In the menu mode, the keys perform the functions of the labels
at the bottom of the keys.
SEL-MENU/EXIT key - Pressing this key toggles the printer online
and offline. Pressing this key while holding the SHIFT key enters
and exits the menu mode.
SHIFT key - Press this key in conjunction with other keys to access
secondary functions. It is only active when the printer is deselected.
LINE FEED/GROUP key - In the normal operating mode, pressing
this key advances paper one line at the current lpi setting. In the
menu mode, pressing this key allows group selection. Holding this
key on power up will print a font test. Pressing this key while holding
the SHIFT key will move the form down in micro-increments.
FF-LOAD/ITEM key - In the normal operating mode, pressing this
key will advance paper to the next top-of-form. In the menu mode,
pressing this key allows item selections. Pressing this key while
holding the SHIFT key will move the paper up in micro-increments.
TEAR/SET key - In the normal operating mode, pressing this key
will move the paper to the tear-off position. In the menu mode,
pressing this key will select settings of items in a group.
PARK/PRINT key - In the normal operating mode, pressing this key
will park continuous forms in the tractor. Pressing this key while
holding the SHIFT key will print a list of menu settings for the current
emulation.
QUIET/TOF key - In the normal operating mode, pressing this key
will put the printer in a quiet mode of operation. In the normal
operating mode and offline, pressing this key will set the top-of-form
at the current paper position. In the menu mode, pressing this key
will print a rolling ASCII self-test.
PRINT QUALITY key - Pressing this key will toggle print quality
selections between NLQ (near letter quality), UTL (utility), and HSD
(high speed draft).
CHARACTER PITCH key - Pressing this key will toggle character
per inch (cpi) selections as indicated. Pressing this key while holding
the SHIFT key will reset the printer.
Self-test
ROLLING ASCII SELF-TEST - Holding the QUIET key down while
turning on power will start the test. This test prints a header with the
printer model, firmware revision, firmware part number, and
emulation. Then it prints a barber pole pattern. Press the SEL key to
stop the test.
FONT TEST - Holding the LINE FEED key while powering on the
printer will activate this test. This test prints the same header as the
rolling ASCII and follows with a list of available fonts.
HEX DUMP - Hex dump is a diagnostic test used to troubleshoot
data problems. Enter hex dump by holding the SEL and FF/LOAD
keys while powering on the printer. The printer will print any
incoming data in a hexadecimal format on the left, while printing its
ASCII equivalent on the right. Any control characters will be printed
on the right as a period.
PRINT HEAD ADJUST TEST - This test must be performed if the
print head or control board is replaced. It must also be performed
when the gap between the print head and platen is adjusted.
Remove the paper and leave the ribbon installed. Turn on the printer
while holding down the TEAR and QUIET keys. The self-adjust test
will be performed automatically. A flashing ALARM light indicates a
failure has been detected.
OK-19
