OKIDATA 320
OSR
IBM machine type
ML-320 E/I Parallel . . . . . . . . . . . . . . 1515-K28
ML-320 E/I Serial . . . . . . . . . . . . . . . . 1515-K48
ML-320 ML Parallel . . . . . . . . . . . . . . 1515-K72
ML-320 ML Serial. . . . . . . . . . . . . . . . 1515-K55
Documentation / Training
Maintenance manual . . . . . . . . . . . . . ZA38-0148-01
Training video. . . . . . . . . . . . . . . . . . . ZC38-7074-00
Student guide. . . . . . . . . . . . . . . . . . . ZZ28-0963-00
Similar to . . . . . . . . . . . . . . . . . . . . . . . . . . . . Anzac 2320, TI 830
Tech Support 800-877-7764
Cover Removal
Remove platen knob. Insert a flat-blade screwdriver into the three slots at the
bottom front edge of the bottom cover and pry upward. This will release the
latches that secure the top cover to the bottom. Then lift the front of the top
cover and push back to disengage the rear of the top cover.
Parts
DESCRIPTION
OEM PN
IBM PN
Print head
50063802
86F4562
Ribbon protector
53056201
86F4590
Print head cable
56616301
93F9480
Platen knob
51901101
86F4579
Ribbon drive assembly
50063701
93F9489
Access cover
50060701
93F8744
Sheet separator
50060901
93F8742
Tractor assy (L)
50062101
93F6464
Tractor assy (R)
50062001
93F6465
Pull tractor assembly
N/A
31F0458
Leaf spring
50911501
93F6379
Bail arm (L)
53489301
93F9485
Bail arm (R)
53489201
93F9486
Bail spring (L)
50911801
93F9484
Bail spring (R)
50911701
93F9483
Power supply PCB
N/A
93F8741
Control PCB 32 pin IC
N/A
93F6375
Control PCB 28 pin IC no CN8
N/A
93F8166
Control PCB 28 pin IC 12 pin CN8
N/A
93F8167
Control panel PCB
N/A
20H5586
Control panel overlay
N/A
93F6377
Control panel PCB (SSD only)
55075011
22H1248
Control panel overlay (SSD only)
50107426
22H1247
Control PCB (SSD only)
55075111
22H1249
Transformer (SSD only)
56413201
22H1250
Serial I/F PCB
55038901
93F6382
Space motor assembly
N/A
93F6919
Space rack
53489401
93F6378
Ruler guide
53488701
93F9488
Platen
50061305
93F8743
Paper feed motor w/gear
N/A
93F6460
Paper feed motor gear only
51219001
45F5209
Idler gear (right side)
51216001
93F9481
Change gear (right side)
51215901
93F9482
Tractor gear (right side)
51216101
93F9487
Note: Be sure to print a menu/configuration list before replacing a PCB
or logic containing configuration settings.
Slots Platen Knob
Troubleshooting
Note: When replacing the control board, be sure to transfer the ROM chip
(Q13 in the standard model or Q4 in the SSD model) from the old control
board to the new one.
Print quality - Poorly formed characters, light print, dots missing, etc., 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, or defective
control board.
Communication - No communication or incorrect data. Check to ensure
printer and host configurations match. If config matches, replace serial I/F or
control PCB.
Print head alarm - (thermal) - Menu light flashes and printing halts. Normal
condition after long job or heavy printing. If unrecoverable after cooling period,
replace print head and/or control board.
Paper-out - 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 defective control board.
Faults - 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.
Indicator
Failure
Solution
10 CPI
Internal RAM
Replace control board
12 CPI
Program ROM
Replace control board or firmware
17 CPI
External RAM
Replace control board
20 CPI
Space motor*
Replace space motor
and/or control board
* Carriage motor, which is located on the carriage, below the print head
Blown fuse -The line fuse is located next to the AC power input connector on
the input filter board. If the fuse blows again after replacing it, this indicates a
short in the space motor drive on the control board and/or a short in the space
motor.
Note: If both the space motor and the control board are shorted, both
must be replaced simultaneously. Failure to do so may result in new
parts becoming shorted also. If needed, call technical support for
assistance in determining which component has failed. A volt/ohm meter
Special Note - SSD Version
A newer version of the OKIDATA ML-320 is now available. It is known as the
ML-320 SSD. SSD stands for Super Speed Draft, which is a faster speed of
draft print. This version may be identified by two methods. In the print quality
section of the control panel is the SSD indicator. The fourth digit of the serial
number is "D". This is important to note as several parts used in the SSD
version are not compatible with those in the older versions. These different
parts are designated with "SSD only" in the description found on the reverse of
this document. The SSD version is also available in the two different emulation
models as explained above.
© Copyright International Business Machines Corporation March 1995.
All rights reserved.
IBM/TSS Internal use only
