OKIDATA ML-520 User manual

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. Aflashing ALARM light indicates a
failure has been detected.
OK-19

OKIDATA ML-520 OSR
Printer Configuration
To print a configuration, enter the menu mode by pressing theSEL
key while holding the SHIFT key. Then press the PARK key and a
current menu list will print for the selected emulation. To change a
setting, press the GROUP key until the group containing the item is
printed. Then press the ITEM key until the desired item is printed.
Press the SET key until the desired setting is printed. Press the EXIT
key to exit the menu mode and save settings.
Adjustments
Print Head Gap - Remove the upper cover, pull roller assembly,
ribbon, print head, and ribbon protector. Reinstall the print head.
Turn the paper path lever to the rear position and rotate the platen
by hand. Set the gap change gear to position 2 by turning the adjust
screw. While turning the adjust screw, move the carriage to the right
for clockwise movement and to the left for counterclockwise
movement. Slide the carriage to the left side of the platen and check
the gap with a feeler guage. The gap should be .014" +/- .001". To
adjust the gap, use a straightened paper clip to push down on the
adjust gear to disengage it from the idle gear. Turn the adjustment
screw clockwise to increase the gap and counterclockwise to
decrease the gap. Check the right side in the same manner.
Common Problems and Solutions
Print Quality - Poorly formed characters, light print, and missing
dots can be caused by an incorrect print head gap, defective print
head, defective ribbon, print head cables, or control board.
Paper Motion - Paper motion problems can be caused by
obstructions in the paper path, defective drive gearing, defective
paper feed motor, defective control board, or improper print head
gap.
Communication - No communication or incorrect data. Check to
ensure printer and host configurations match. If the configuration
matches, replace the serial I/F or the control PCB.
Alarms
Print head (thermal) - Menu light flashes and printing halts. Normal
condition after long job or heavy printing. If unrecoverable after a
cooling period, replace the print head and/or control board.
Paper end - Alarm light remains on and printing halts. Check that
paper is loaded and covering the groove on the left end of the
platen. Also check for a broken or jammed paper out lever, or a
defective control PCB.
Error Codes
When the fault light flashes with one of the cpi lights continuously lit,
turn power off, wait 30 seconds, and then power on again. If the fault
persists, this indicates a hardware failure.
10 CPI Internal RAM; replace control board.
10 CPI & HSD I/F fault; replace I/F.
10 & 20 CPI Check print head connection; replace print head, print
head cable, or control board.
10 & 20 CPI & UTILITY Check print head connection; replace print
head, print head cable, or control board.
10 & 20 CPI & HSD Check print head connection; replace print
head, print head cable, or control board.
10 CPI & PROP Check print head connection; replace print head,
print head cable, or control board.
10 CPI & PROP & HSD Check print head connection; replace print
head, print head cable, or control board.
10 CPI & PROP & UTILITY Check print head connection; replace
print head, print head cable, or control board.
10 & 20 CPI & NLQ Check print head connection; replace print
head, print head cable, or control board.
10 & 20 CPI & PROP Replace control board, space motor, or line
feed motor.
12 CPI & HSD Replace control board or I/F.
15 CPI Replace ROM or control board.
15 CPI & HSD Replace CG Rom or control board.
15 CPI & NLQ Replace control board.
17 CPI Replace control board.
17 CPI & UTILITY Replace ROM or control board.
17 CPI & HSD Replace control board.
20 CPI Replace control board.
20 CPI & HSD Replace I/F board.
PROP & HSD Check for carriage binding; replace space motor, print
head cable, or control board.
PROP & UTILITY Check for carriage binding; replace space motor,
print head cable, or control board.
Cover Removal
Remove the platen knob, insert a flat-blade screwdriver into the
slots at the bottom front edge of the bottom cover. This will release
the latches that secure the top cover to the bottom. Then lift the front
of the top cover and push it back to disengage the rear of the top
cover.
Field Replaceable Units
Sheet guide assembly 51009401 93F8917
Access cover assembly 53067101 93F8916
Platen knob 53562601 93F8899
Control board 55072401 90G8046
Front panel board 55937502 90G8040
Front panel 53562703 90G8042
Line feed motor 56510303 90G8041
Front roller holder 53341101 93F8901
Pull up roller assembly 53341501 93F8915
Platen assembly 50098301 93F8918
Idler gear 51228201 93F8003
Change lever 50805101 93G8044
Print head assembly 50099501 90G8045
Space motor assembly 56510401 93F8891
Gear case assembly 51228501 93F8904
Ribbon protector 53562801 93F8897
Serial I/F 70012801 93F8913
Note: Be sure to note DIP switch settings and/or print a
configuration list before replacing any PCB.
Machine type. . . . . . . . . . . . . . . . . . . . . . . . . 1515-K91
Similar to . . . . . . . . . . . . . . . . . . . . . . . . . . . . Anzac 2330
Maintenance manual. . . . . . . . . . . . . . . . . . . ZA38-0179
Tech Support 800-877-7764
© Copyright International Business Machines Corporation March 1995.
All rights reserved. IBM/TSS Internal use only