42114101 Rev.1
104 /
6.5
Troubleshooting flow chart
1
Power is not supplied.
Is the AC cable connected correctly?
Yes
No
Connect the AC cable correctly.
Is fuse F1 on the transformer assy/or F1 on the Power Supply Board blown?
No
Yes
Replace fuse (with same type and rating).
Remedied?
No
Yes
End
Does DC + 50V out?
No
Yes
Remove Print Head. (Turn power off, then on.)
Remedied?
No
Yes
End
Replace carriage cable or ribbon feed mechanism.
Remedied?
No
Yes
End
Replace Control Board
Remove CN3 on Power Supply Board
Measure for any short circuits b 5V, + 50V, + 12V, - 8V, 0V in CN2 of Control
Board.
Any short circuit?
No
Yes
Summary of Contents for ML490 Series
Page 1: ...42114101 Rev 1 1 135 ML490 491 PRINTER Maintenance Manual ODA...
Page 2: ...42114101 Rev 1 2...
Page 38: ...42114101 Rev 1 38 Drive gear Ink tank Ribbon cartridge Figure 2 6...
Page 48: ...42114101 Rev 1 48 Change arm Change lever Platen Release cam Figure 2 13 REAR TOP BOTTOM...
Page 96: ...42114101 Rev 1 96 9 Carriage Assy NK2 10 SUS Bearing portion of guide roller EM 30L B...
Page 119: ...42114101 Rev 1 119 6 8 9 7 1 2 3 11 10 4 5 Figure B 2 Printer General Assy...
Page 124: ...42114101 Rev 1 124 9 12 11 1 13 3 7 1 14 5 6 7 2 10 8 Figure B 4 Carriage Assy...