42113901 Rev.2
132 /
Oki Data CONFIDENTIAL
2
In receiving by serial interface, printing data is omitted or printing operation is not performed.
Are RxD and SSD of Q3 as specified in Figure C-7?
No
Replace the Q2.
Yes Are, WR, and BUS signals of Q3 pin 3 as specified in Figure C-8?
No
Replace the Q3.
Yes Is the level of a BUS signals at Q7 pins 2-9 the same as that of DB0-7 when
WR signal is started?
No
Replace the Q7.
Yes Is 4 pin of Q6 identical to WR signal in Figure C-8?
No
Replace the Q6.
Yes Check Q3 in the Control Board.
Figure C-8
542ns
5V
0V
5V
0V
WR
Q3-3
Содержание ML421 Series
Страница 1: ...42113901 Rev 2 1 133 Oki Data CONFIDENTIAL ML420 421 PRINTER Maintenance Manual ODA...
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Страница 117: ...42113901 Rev 2 117 Oki Data CONFIDENTIAL Figure B 2 Printer General Assy 6 9 7 1 2 3 11 10 4 5 8...
Страница 122: ...42113901 Rev 2 122 Oki Data CONFIDENTIAL Figure B 4 Carriage Assy 12 9 8 6 14 4 10 7 11 13 3 1...