Oki ML490 Maintenance Manual - Page 97

Troubleshooting And Repair

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6. TROUBLESHOOTING AND REPAIR 6.1 Items to Check Before Repair (1) Check the inspection items specified in the instruction manual. (2) Find out as many details of the trouble as possible from the customer. (3) Inspect in the conditions as close as possible to those at the time the trouble occurred. (4) Proceed with the repair as follows: Check the trouble status according to Table 6.1 for the details of the trouble. Then, locate the trouble position according to the detailed flowchart. (5) Carry out a thorough test after the repair to check for correct functioning. 6.2 Troubleshooting Table Status Trouble upon power on Trouble during printing Trouble Contents Power is not supplied. No spacing operation Table 6.1 Troubleshooting Flowchart No. Surmise of Trouble 1 Power Supply Board, Control Board, Transformer Assy. Space Motor, Carriage Cable, 2 Printhead. Space Motor, Carriage Cable, Homing does not end normally. 3 Power Supply Board, Control Board, Spacing Mechanism Paper jam while paper insertion 4 Pressure Roller Mechanism, Pull Up Roller Cover. Smearing/Missing dots 5 Printhead, Control Board, Space Motor, Carriage Cable Faint or dark print 6 Printhead, Ribbon Feed Assembly, Control Board Ribbon feed trouble 7 Ribbon Feed Assembly, Space Motor, Control Board Line feed trouble 8 LF Motor, Platen Assy, LF Mechanism, Control Board Malfunction of switch on operation panel 9 Operation Panel Board, Control Board Data receiving failure 0 Control Board, (RS232C I/F Board), I/F Cable, Menu Setting 42114101 Rev.1 97 /

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42114101
Rev.1
97 /
6.
TROUBLESHOOTING AND REPAIR
6.1
Items to Check Before Repair
(1)
Check the inspection items specified in the instruction manual.
(2)
Find out as many details of the trouble as possible from the customer.
(3)
Inspect in the conditions as close as possible to those at the time the trouble occurred.
(4)
Proceed with the repair as follows:
Check the trouble status according to Table 6.1 for the details of the trouble. Then, locate
the trouble position according to the detailed flowchart.
(5)
Carry out a thorough test after the repair to check for correct functioning.
6.2
Troubleshooting Table
Table 6.1
Status
Trouble Contents
Troubleshooting
Flowchart No.
Surmise of Trouble
Power is not supplied.
No spacing operation
1
2
Power Supply Board,
Control Board, Transformer Assy.
Space Motor, Carriage Cable,
Printhead.
Homing does not end normally.
3
Space Motor, Carriage Cable,
Power Supply Board,
Control Board, Spacing Mechanism
Trouble upon
power on
Paper jam while paper insertion
4
Pressure Roller Mechanism, Pull Up
Roller Cover.
Smearing/Missing dots
5
Printhead, Control Board, Space
Motor, Carriage Cable
Faint or dark print
6
Printhead, Ribbon Feed Assembly,
Control Board
Ribbon feed trouble
7
Ribbon Feed Assembly, Space
Motor, Control Board
Line feed trouble
8
LF Motor, Platen Assy, LF
Mechanism, Control Board
Malfunction of switch on
operation panel
9
Operation Panel Board, Control
Board
Data receiving failure
0
Control Board, (RS232C I/F Board),
I/F Cable, Menu Setting
Trouble during
printing